c3-es.js

/* @license C3.js v0.7.18 | (c) C3 Team and other contributors | http://c3js.org/ */
import * as d3 from "https://cdn.skypack.dev/d3@5";

export const initC3 = (window) => {
  // set d3
  window.d3 = d3;

  //<link href="./c3.css" rel="stylesheet">
  const link = window.document.createElement("link");
  //link.href = "./c3.css";
  link.href = "https://code4fukui.github.io/c3-es/c3.css";
  link.rel = "stylesheet";
  document.head.appendChild(link);

function ChartInternal(api) {
  var $$ = this;
  // Note: This part will be replaced by rollup-plugin-modify
  // When bundling esm output. Beware of changing this line.
  // TODO: Maybe we should check that the modification by rollup-plugin-modify
  // is valid during unit tests.
  $$.d3 = window.d3
    ? window.d3
    : typeof require !== 'undefined'
    ? require('d3')
    : undefined;
  $$.api = api;
  $$.config = $$.getDefaultConfig();
  $$.data = {};
  $$.cache = {};
  $$.axes = {};
}

/**
 * The Chart class
 *
 * The methods of this class is the public APIs of the chart object.
 */
function Chart(config) {
  this.internal = new ChartInternal(this);
  this.internal.loadConfig(config);

  this.internal.beforeInit(config);
  this.internal.init();
  this.internal.afterInit(config)

  // bind "this" to nested API
  ;(function bindThis(fn, target, argThis) {
    Object.keys(fn).forEach(function(key) {
      target[key] = fn[key].bind(argThis);
      if (Object.keys(fn[key]).length > 0) {
        bindThis(fn[key], target[key], argThis);
      }
    });
  })(Chart.prototype, this, this);
}

var asHalfPixel = function(n) {
  return Math.ceil(n) + 0.5
};
var ceil10 = function(v) {
  return Math.ceil(v / 10) * 10
};
var diffDomain = function(d) {
  return d[1] - d[0]
};
var getOption = function(options, key, defaultValue) {
  return isDefined(options[key]) ? options[key] : defaultValue
};
var getPathBox = function(path) {
  var box = getBBox(path),
    items = [path.pathSegList.getItem(0), path.pathSegList.getItem(1)],
    minX = items[0].x,
    minY = Math.min(items[0].y, items[1].y);
  return { x: minX, y: minY, width: box.width, height: box.height }
};
var getBBox = function(element) {
  try {
    return element.getBBox()
  } catch (ignore) {
    // Firefox will throw an exception if getBBox() is called whereas the
    // element is rendered with display:none
    // See https://github.com/c3js/c3/issues/2692

    // The previous code was using `getBoundingClientRect` which was returning
    // everything at 0 in this case so let's reproduce this behavior here.

    return { x: 0, y: 0, width: 0, height: 0 }
  }
};
var hasValue = function(dict, value) {
  var found = false;
  Object.keys(dict).forEach(function(key) {
    if (dict[key] === value) {
      found = true;
    }
  });
  return found
};
var isArray = function(o) {
  return Array.isArray(o)
};
var isDefined = function(v) {
  return typeof v !== 'undefined'
};
var isEmpty = function(o) {
  return (
    typeof o === 'undefined' ||
    o === null ||
    (isString(o) && o.length === 0) ||
    (typeof o === 'object' && Object.keys(o).length === 0)
  )
};
var isFunction = function(o) {
  return typeof o === 'function'
};
var isNumber = function(o) {
  return typeof o === 'number'
};
var isString = function(o) {
  return typeof o === 'string'
};
var isUndefined = function(v) {
  return typeof v === 'undefined'
};
var isValue = function(v) {
  return v || v === 0
};
var notEmpty = function(o) {
  return !isEmpty(o)
};
var sanitise = function(str) {
  return typeof str === 'string'
    ? str.replace(/</g, '&lt;').replace(/>/g, '&gt;')
    : str
};
var flattenArray = function(arr) {
  return Array.isArray(arr) ? [].concat(...arr) : []
};
/**
 * Returns whether the point is within the given box.
 *
 * @param {Array} point An [x,y] coordinate
 * @param {Object} box An object with {x, y, width, height} keys
 * @param {Number} sensitivity An offset to ease check on very small boxes
 */
var isWithinBox = function(point, box, sensitivity = 0) {
  const xStart = box.x - sensitivity;
  const xEnd = box.x + box.width + sensitivity;
  const yStart = box.y + box.height + sensitivity;
  const yEnd = box.y - sensitivity;

  return (
    xStart < point[0] && point[0] < xEnd && yEnd < point[1] && point[1] < yStart
  )
};

/**
 * Returns Internet Explorer version number (or false if no Internet Explorer used).
 *
 * @param string agent Optional parameter to specify user agent
 */
var getIEVersion = function(agent) {
  // https://stackoverflow.com/questions/19999388/check-if-user-is-using-ie
  if (typeof agent === 'undefined') {
    agent = window.navigator.userAgent;
  }

  let pos = agent.indexOf('MSIE '); // up to IE10
  if (pos > 0) {
    return parseInt(agent.substring(pos + 5, agent.indexOf('.', pos)), 10)
  }

  pos = agent.indexOf('Trident/'); // IE11
  if (pos > 0) {
    pos = agent.indexOf('rv:');
    return parseInt(agent.substring(pos + 3, agent.indexOf('.', pos)), 10)
  }

  return false
};

/**
 * Returns whether the used browser is Internet Explorer.
 *
 * @param {Number} version Optional parameter to specify IE version
 */
var isIE = function(version) {
  const ver = getIEVersion();

  if (typeof version === 'undefined') {
    return !!ver
  }

  return version === ver
};

function AxisInternal(component, params) {
  var internal = this;
  internal.component = component;
  internal.params = params || {};

  internal.d3 = component.d3;
  internal.scale = internal.d3.scaleLinear();
  internal.range;
  internal.orient = 'bottom';
  internal.innerTickSize = 6;
  internal.outerTickSize = this.params.withOuterTick ? 6 : 0;
  internal.tickPadding = 3;
  internal.tickValues = null;
  internal.tickFormat;
  internal.tickArguments;

  internal.tickOffset = 0;
  internal.tickCulling = true;
  internal.tickCentered;
  internal.tickTextCharSize;
  internal.tickTextRotate = internal.params.tickTextRotate;
  internal.tickLength;

  internal.axis = internal.generateAxis();
}

AxisInternal.prototype.axisX = function(selection, x, tickOffset) {
  selection.attr('transform', function(d) {
    return 'translate(' + Math.ceil(x(d) + tickOffset) + ', 0)'
  });
};
AxisInternal.prototype.axisY = function(selection, y) {
  selection.attr('transform', function(d) {
    return 'translate(0,' + Math.ceil(y(d)) + ')'
  });
};
AxisInternal.prototype.scaleExtent = function(domain) {
  var start = domain[0],
    stop = domain[domain.length - 1];
  return start < stop ? [start, stop] : [stop, start]
};
AxisInternal.prototype.generateTicks = function(scale) {
  var internal = this;
  var i,
    domain,
    ticks = [];
  if (scale.ticks) {
    return scale.ticks.apply(scale, internal.tickArguments)
  }
  domain = scale.domain();
  for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
    ticks.push(i);
  }
  if (ticks.length > 0 && ticks[0] > 0) {
    ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
  }
  return ticks
};
AxisInternal.prototype.copyScale = function() {
  var internal = this;
  var newScale = internal.scale.copy(),
    domain;
  if (internal.params.isCategory) {
    domain = internal.scale.domain();
    newScale.domain([domain[0], domain[1] - 1]);
  }
  return newScale
};
AxisInternal.prototype.textFormatted = function(v) {
  var internal = this,
    formatted = internal.tickFormat ? internal.tickFormat(v) : v;
  return typeof formatted !== 'undefined' ? formatted : ''
};
AxisInternal.prototype.updateRange = function() {
  var internal = this;
  internal.range = internal.scale.rangeExtent
    ? internal.scale.rangeExtent()
    : internal.scaleExtent(internal.scale.range());
  return internal.range
};
AxisInternal.prototype.updateTickTextCharSize = function(tick) {
  var internal = this;
  if (internal.tickTextCharSize) {
    return internal.tickTextCharSize
  }
  var size = {
    h: 11.5,
    w: 5.5
  };
  tick
    .select('text')
    .text(function(d) {
      return internal.textFormatted(d)
    })
    .each(function(d) {
      var box = getBBox(this),
        text = internal.textFormatted(d),
        h = box.height,
        w = text ? box.width / text.length : undefined;
      if (h && w) {
        size.h = h;
        size.w = w;
      }
    })
    .text('');
  internal.tickTextCharSize = size;
  return size
};
AxisInternal.prototype.isVertical = function() {
  return this.orient === 'left' || this.orient === 'right'
};
AxisInternal.prototype.tspanData = function(d, i, scale) {
  var internal = this;
  var splitted = internal.params.tickMultiline
    ? internal.splitTickText(d, scale)
    : [].concat(internal.textFormatted(d));

  if (internal.params.tickMultiline && internal.params.tickMultilineMax > 0) {
    splitted = internal.ellipsify(splitted, internal.params.tickMultilineMax);
  }

  return splitted.map(function(s) {
    return { index: i, splitted: s, length: splitted.length }
  })
};
AxisInternal.prototype.splitTickText = function(d, scale) {
  var internal = this,
    tickText = internal.textFormatted(d),
    maxWidth = internal.params.tickWidth,
    subtext,
    spaceIndex,
    textWidth,
    splitted = [];

  if (Object.prototype.toString.call(tickText) === '[object Array]') {
    return tickText
  }

  if (!maxWidth || maxWidth <= 0) {
    maxWidth = internal.isVertical()
      ? 95
      : internal.params.isCategory
      ? Math.ceil(scale(1) - scale(0)) - 12
      : 110;
  }

  function split(splitted, text) {
    spaceIndex = undefined;
    for (var i = 1; i < text.length; i++) {
      if (text.charAt(i) === ' ') {
        spaceIndex = i;
      }
      subtext = text.substr(0, i + 1);
      textWidth = internal.tickTextCharSize.w * subtext.length;
      // if text width gets over tick width, split by space index or crrent index
      if (maxWidth < textWidth) {
        return split(
          splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)),
          text.slice(spaceIndex ? spaceIndex + 1 : i)
        )
      }
    }
    return splitted.concat(text)
  }

  return split(splitted, tickText + '')
};
AxisInternal.prototype.ellipsify = function(splitted, max) {
  if (splitted.length <= max) {
    return splitted
  }

  var ellipsified = splitted.slice(0, max);
  var remaining = 3;
  for (var i = max - 1; i >= 0; i--) {
    var available = ellipsified[i].length;

    ellipsified[i] = ellipsified[i]
      .substr(0, available - remaining)
      .padEnd(available, '.');

    remaining -= available;

    if (remaining <= 0) {
      break
    }
  }

  return ellipsified
};
AxisInternal.prototype.updateTickLength = function() {
  var internal = this;
  internal.tickLength =
    Math.max(internal.innerTickSize, 0) + internal.tickPadding;
};
AxisInternal.prototype.lineY2 = function(d) {
  var internal = this,
    tickPosition =
      internal.scale(d) + (internal.tickCentered ? 0 : internal.tickOffset);
  return internal.range[0] < tickPosition && tickPosition < internal.range[1]
    ? internal.innerTickSize
    : 0
};
AxisInternal.prototype.textY = function() {
  var internal = this,
    rotate = internal.tickTextRotate;
  return rotate
    ? 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1)
    : internal.tickLength
};
AxisInternal.prototype.textTransform = function() {
  var internal = this,
    rotate = internal.tickTextRotate;
  return rotate ? 'rotate(' + rotate + ')' : ''
};
AxisInternal.prototype.textTextAnchor = function() {
  var internal = this,
    rotate = internal.tickTextRotate;
  return rotate ? (rotate > 0 ? 'start' : 'end') : 'middle'
};
AxisInternal.prototype.tspanDx = function() {
  var internal = this,
    rotate = internal.tickTextRotate;
  return rotate ? 8 * Math.sin(Math.PI * (rotate / 180)) : 0
};
AxisInternal.prototype.tspanDy = function(d, i) {
  var internal = this,
    dy = internal.tickTextCharSize.h;
  if (i === 0) {
    if (internal.isVertical()) {
      dy = -((d.length - 1) * (internal.tickTextCharSize.h / 2) - 3);
    } else {
      dy = '.71em';
    }
  }
  return dy
};

AxisInternal.prototype.generateAxis = function() {
  var internal = this,
    d3 = internal.d3,
    params = internal.params;
  function axis(g, transition) {
    var self;
    g.each(function() {
      var g = (axis.g = d3.select(this));

      var scale0 = this.__chart__ || internal.scale,
        scale1 = (this.__chart__ = internal.copyScale());

      var ticksValues = internal.tickValues
          ? internal.tickValues
          : internal.generateTicks(scale1),
        ticks = g.selectAll('.tick').data(ticksValues, scale1),
        tickEnter = ticks
          .enter()
          .insert('g', '.domain')
          .attr('class', 'tick')
          .style('opacity', 1e-6),
        // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
        tickExit = ticks.exit().remove(),
        tickUpdate = ticks.merge(tickEnter),
        tickTransform,
        tickX,
        tickY;

      if (params.isCategory) {
        internal.tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
        tickX = internal.tickCentered ? 0 : internal.tickOffset;
        tickY = internal.tickCentered ? internal.tickOffset : 0;
      } else {
        internal.tickOffset = tickX = 0;
      }

      internal.updateRange();
      internal.updateTickLength();
      internal.updateTickTextCharSize(g.select('.tick'));

      var lineUpdate = tickUpdate
          .select('line')
          .merge(tickEnter.append('line')),
        textUpdate = tickUpdate.select('text').merge(tickEnter.append('text'));

      var tspans = tickUpdate
          .selectAll('text')
          .selectAll('tspan')
          .data(function(d, i) {
            return internal.tspanData(d, i, scale1)
          }),
        tspanEnter = tspans.enter().append('tspan'),
        tspanUpdate = tspanEnter.merge(tspans).text(function(d) {
          return d.splitted
        });
      tspans.exit().remove();

      var path = g.selectAll('.domain').data([0]),
        pathUpdate = path
          .enter()
          .append('path')
          .merge(path)
          .attr('class', 'domain');

      // TODO: each attr should be one function and change its behavior by internal.orient, probably
      switch (internal.orient) {
        case 'bottom': {
          tickTransform = internal.axisX;
          lineUpdate
            .attr('x1', tickX)
            .attr('x2', tickX)
            .attr('y2', function(d, i) {
              return internal.lineY2(d, i)
            });
          textUpdate
            .attr('x', 0)
            .attr('y', function(d, i) {
              return internal.textY(d, i)
            })
            .attr('transform', function(d, i) {
              return internal.textTransform(d, i)
            })
            .style('text-anchor', function(d, i) {
              return internal.textTextAnchor(d, i)
            });
          tspanUpdate
            .attr('x', 0)
            .attr('dy', function(d, i) {
              return internal.tspanDy(d, i)
            })
            .attr('dx', function(d, i) {
              return internal.tspanDx(d, i)
            });
          pathUpdate.attr(
            'd',
            'M' +
              internal.range[0] +
              ',' +
              internal.outerTickSize +
              'V0H' +
              internal.range[1] +
              'V' +
              internal.outerTickSize
          );
          break
        }
        case 'top': {
          // TODO: rotated tick text
          tickTransform = internal.axisX;
          lineUpdate
            .attr('x1', tickX)
            .attr('x2', tickX)
            .attr('y2', function(d, i) {
              return -1 * internal.lineY2(d, i)
            });
          textUpdate
            .attr('x', 0)
            .attr('y', function(d, i) {
              return (
                -1 * internal.textY(d, i) -
                (params.isCategory ? 2 : internal.tickLength - 2)
              )
            })
            .attr('transform', function(d, i) {
              return internal.textTransform(d, i)
            })
            .style('text-anchor', function(d, i) {
              return internal.textTextAnchor(d, i)
            });
          tspanUpdate
            .attr('x', 0)
            .attr('dy', function(d, i) {
              return internal.tspanDy(d, i)
            })
            .attr('dx', function(d, i) {
              return internal.tspanDx(d, i)
            });
          pathUpdate.attr(
            'd',
            'M' +
              internal.range[0] +
              ',' +
              -internal.outerTickSize +
              'V0H' +
              internal.range[1] +
              'V' +
              -internal.outerTickSize
          );
          break
        }
        case 'left': {
          tickTransform = internal.axisY;
          lineUpdate
            .attr('x2', -internal.innerTickSize)
            .attr('y1', tickY)
            .attr('y2', tickY);
          textUpdate
            .attr('x', -internal.tickLength)
            .attr('y', internal.tickOffset)
            .style('text-anchor', 'end');
          tspanUpdate
            .attr('x', -internal.tickLength)
            .attr('dy', function(d, i) {
              return internal.tspanDy(d, i)
            });
          pathUpdate.attr(
            'd',
            'M' +
              -internal.outerTickSize +
              ',' +
              internal.range[0] +
              'H0V' +
              internal.range[1] +
              'H' +
              -internal.outerTickSize
          );
          break
        }
        case 'right': {
          tickTransform = internal.axisY;
          lineUpdate
            .attr('x2', internal.innerTickSize)
            .attr('y1', tickY)
            .attr('y2', tickY);
          textUpdate
            .attr('x', internal.tickLength)
            .attr('y', internal.tickOffset)
            .style('text-anchor', 'start');
          tspanUpdate.attr('x', internal.tickLength).attr('dy', function(d, i) {
            return internal.tspanDy(d, i)
          });
          pathUpdate.attr(
            'd',
            'M' +
              internal.outerTickSize +
              ',' +
              internal.range[0] +
              'H0V' +
              internal.range[1] +
              'H' +
              internal.outerTickSize
          );
          break
        }
      }
      if (scale1.rangeBand) {
        var x = scale1,
          dx = x.rangeBand() / 2;
        scale0 = scale1 = function(d) {
          return x(d) + dx
        };
      } else if (scale0.rangeBand) {
        scale0 = scale1;
      } else {
        tickExit.call(tickTransform, scale1, internal.tickOffset);
      }
      tickEnter.call(tickTransform, scale0, internal.tickOffset);
      self = (transition ? tickUpdate.transition(transition) : tickUpdate)
        .style('opacity', 1)
        .call(tickTransform, scale1, internal.tickOffset);
    });
    return self
  }
  axis.scale = function(x) {
    if (!arguments.length) {
      return internal.scale
    }
    internal.scale = x;
    return axis
  };
  axis.orient = function(x) {
    if (!arguments.length) {
      return internal.orient
    }
    internal.orient =
      x in { top: 1, right: 1, bottom: 1, left: 1 } ? x + '' : 'bottom';
    return axis
  };
  axis.tickFormat = function(format) {
    if (!arguments.length) {
      return internal.tickFormat
    }
    internal.tickFormat = format;
    return axis
  };
  axis.tickCentered = function(isCentered) {
    if (!arguments.length) {
      return internal.tickCentered
    }
    internal.tickCentered = isCentered;
    return axis
  };
  axis.tickOffset = function() {
    return internal.tickOffset
  };
  axis.tickInterval = function() {
    var interval, length;
    if (params.isCategory) {
      interval = internal.tickOffset * 2;
    } else {
      length =
        axis.g
          .select('path.domain')
          .node()
          .getTotalLength() -
        internal.outerTickSize * 2;
      interval = length / axis.g.selectAll('line').size();
    }
    return interval === Infinity ? 0 : interval
  };
  axis.ticks = function() {
    if (!arguments.length) {
      return internal.tickArguments
    }
    internal.tickArguments = arguments;
    return axis
  };
  axis.tickCulling = function(culling) {
    if (!arguments.length) {
      return internal.tickCulling
    }
    internal.tickCulling = culling;
    return axis
  };
  axis.tickValues = function(x) {
    if (typeof x === 'function') {
      internal.tickValues = function() {
        return x(internal.scale.domain())
      };
    } else {
      if (!arguments.length) {
        return internal.tickValues
      }
      internal.tickValues = x;
    }
    return axis
  };
  return axis
};

var CLASS = {
  target: 'c3-target',
  chart: 'c3-chart',
  chartLine: 'c3-chart-line',
  chartLines: 'c3-chart-lines',
  chartBar: 'c3-chart-bar',
  chartBars: 'c3-chart-bars',
  chartText: 'c3-chart-text',
  chartTexts: 'c3-chart-texts',
  chartArc: 'c3-chart-arc',
  chartArcs: 'c3-chart-arcs',
  chartArcsTitle: 'c3-chart-arcs-title',
  chartArcsBackground: 'c3-chart-arcs-background',
  chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
  chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
  chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
  selectedCircle: 'c3-selected-circle',
  selectedCircles: 'c3-selected-circles',
  eventRect: 'c3-event-rect',
  eventRects: 'c3-event-rects',
  eventRectsSingle: 'c3-event-rects-single',
  eventRectsMultiple: 'c3-event-rects-multiple',
  zoomRect: 'c3-zoom-rect',
  brush: 'c3-brush',
  dragZoom: 'c3-drag-zoom',
  focused: 'c3-focused',
  defocused: 'c3-defocused',
  region: 'c3-region',
  regions: 'c3-regions',
  title: 'c3-title',
  tooltipContainer: 'c3-tooltip-container',
  tooltip: 'c3-tooltip',
  tooltipName: 'c3-tooltip-name',
  shape: 'c3-shape',
  shapes: 'c3-shapes',
  line: 'c3-line',
  lines: 'c3-lines',
  bar: 'c3-bar',
  bars: 'c3-bars',
  circle: 'c3-circle',
  circles: 'c3-circles',
  arc: 'c3-arc',
  arcLabelLine: 'c3-arc-label-line',
  arcs: 'c3-arcs',
  area: 'c3-area',
  areas: 'c3-areas',
  empty: 'c3-empty',
  text: 'c3-text',
  texts: 'c3-texts',
  gaugeValue: 'c3-gauge-value',
  grid: 'c3-grid',
  gridLines: 'c3-grid-lines',
  xgrid: 'c3-xgrid',
  xgrids: 'c3-xgrids',
  xgridLine: 'c3-xgrid-line',
  xgridLines: 'c3-xgrid-lines',
  xgridFocus: 'c3-xgrid-focus',
  ygrid: 'c3-ygrid',
  ygrids: 'c3-ygrids',
  ygridLine: 'c3-ygrid-line',
  ygridLines: 'c3-ygrid-lines',
  colorScale: 'c3-colorscale',
  stanfordElements: 'c3-stanford-elements',
  stanfordLine: 'c3-stanford-line',
  stanfordLines: 'c3-stanford-lines',
  stanfordRegion: 'c3-stanford-region',
  stanfordRegions: 'c3-stanford-regions',
  stanfordText: 'c3-stanford-text',
  stanfordTexts: 'c3-stanford-texts',
  axis: 'c3-axis',
  axisX: 'c3-axis-x',
  axisXLabel: 'c3-axis-x-label',
  axisY: 'c3-axis-y',
  axisYLabel: 'c3-axis-y-label',
  axisY2: 'c3-axis-y2',
  axisY2Label: 'c3-axis-y2-label',
  legendBackground: 'c3-legend-background',
  legendItem: 'c3-legend-item',
  legendItemEvent: 'c3-legend-item-event',
  legendItemTile: 'c3-legend-item-tile',
  legendItemHidden: 'c3-legend-item-hidden',
  legendItemFocused: 'c3-legend-item-focused',
  dragarea: 'c3-dragarea',
  EXPANDED: '_expanded_',
  SELECTED: '_selected_',
  INCLUDED: '_included_'
};

class Axis {
  constructor(owner) {
    this.owner = owner;
    this.d3 = owner.d3;
    this.internal = AxisInternal;
  }
}
Axis.prototype.init = function init() {
  var $$ = this.owner,
    config = $$.config,
    main = $$.main;
  $$.axes.x = main
    .append('g')
    .attr('class', CLASS.axis + ' ' + CLASS.axisX)
    .attr('clip-path', config.axis_x_inner ? '' : $$.clipPathForXAxis)
    .attr('transform', $$.getTranslate('x'))
    .style('visibility', config.axis_x_show ? 'visible' : 'hidden');
  $$.axes.x
    .append('text')
    .attr('class', CLASS.axisXLabel)
    .attr('transform', config.axis_rotated ? 'rotate(-90)' : '')
    .style('text-anchor', this.textAnchorForXAxisLabel.bind(this));
  $$.axes.y = main
    .append('g')
    .attr('class', CLASS.axis + ' ' + CLASS.axisY)
    .attr('clip-path', config.axis_y_inner ? '' : $$.clipPathForYAxis)
    .attr('transform', $$.getTranslate('y'))
    .style('visibility', config.axis_y_show ? 'visible' : 'hidden');
  $$.axes.y
    .append('text')
    .attr('class', CLASS.axisYLabel)
    .attr('transform', config.axis_rotated ? '' : 'rotate(-90)')
    .style('text-anchor', this.textAnchorForYAxisLabel.bind(this));

  $$.axes.y2 = main
    .append('g')
    .attr('class', CLASS.axis + ' ' + CLASS.axisY2)
    // clip-path?
    .attr('transform', $$.getTranslate('y2'))
    .style('visibility', config.axis_y2_show ? 'visible' : 'hidden');
  $$.axes.y2
    .append('text')
    .attr('class', CLASS.axisY2Label)
    .attr('transform', config.axis_rotated ? '' : 'rotate(-90)')
    .style('text-anchor', this.textAnchorForY2AxisLabel.bind(this));
};
Axis.prototype.getXAxis = function getXAxis(
  scale,
  orient,
  tickFormat,
  tickValues,
  withOuterTick,
  withoutTransition,
  withoutRotateTickText
) {
  var $$ = this.owner,
    config = $$.config,
    axisParams = {
      isCategory: $$.isCategorized(),
      withOuterTick: withOuterTick,
      tickMultiline: config.axis_x_tick_multiline,
      tickMultilineMax: config.axis_x_tick_multiline
        ? Number(config.axis_x_tick_multilineMax)
        : 0,
      tickWidth: config.axis_x_tick_width,
      tickTextRotate: withoutRotateTickText ? 0 : config.axis_x_tick_rotate,
      withoutTransition: withoutTransition
    },
    axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient);

  if ($$.isTimeSeries() && tickValues && typeof tickValues !== 'function') {
    tickValues = tickValues.map(function(v) {
      return $$.parseDate(v)
    });
  }

  // Set tick
  axis.tickFormat(tickFormat).tickValues(tickValues);
  if ($$.isCategorized()) {
    axis.tickCentered(config.axis_x_tick_centered);
    if (isEmpty(config.axis_x_tick_culling)) {
      config.axis_x_tick_culling = false;
    }
  }

  return axis
};
Axis.prototype.updateXAxisTickValues = function updateXAxisTickValues(
  targets,
  axis
) {
  var $$ = this.owner,
    config = $$.config,
    tickValues;
  if (config.axis_x_tick_fit || config.axis_x_tick_count) {
    tickValues = this.generateTickValues(
      $$.mapTargetsToUniqueXs(targets),
      config.axis_x_tick_count,
      $$.isTimeSeries()
    );
  }
  if (axis) {
    axis.tickValues(tickValues);
  } else {
    $$.xAxis.tickValues(tickValues);
    $$.subXAxis.tickValues(tickValues);
  }
  return tickValues
};
Axis.prototype.getYAxis = function getYAxis(
  axisId,
  scale,
  orient,
  tickValues,
  withOuterTick,
  withoutTransition,
  withoutRotateTickText
) {
  const $$ = this.owner;
  const config = $$.config;

  let tickFormat = config[`axis_${axisId}_tick_format`];
  if (!tickFormat && $$.isAxisNormalized(axisId)) {
    tickFormat = x => `${x}%`;
  }

  const axis = new this.internal(this, {
    withOuterTick: withOuterTick,
    withoutTransition: withoutTransition,
    tickTextRotate: withoutRotateTickText ? 0 : config.axis_y_tick_rotate
  }).axis
    .scale(scale)
    .orient(orient);

  if (tickFormat) {
    axis.tickFormat(tickFormat);
  }

  if ($$.isTimeSeriesY()) {
    axis.ticks(config.axis_y_tick_time_type, config.axis_y_tick_time_interval);
  } else {
    axis.tickValues(tickValues);
  }
  return axis
};
Axis.prototype.getId = function getId(id) {
  var config = this.owner.config;
  return id in config.data_axes ? config.data_axes[id] : 'y'
};
Axis.prototype.getXAxisTickFormat = function getXAxisTickFormat() {
  // #2251 previously set any negative values to a whole number,
  // however both should be truncated according to the users format specification
  var $$ = this.owner,
    config = $$.config;
  let format = $$.isTimeSeries()
    ? $$.defaultAxisTimeFormat
    : $$.isCategorized()
    ? $$.categoryName
    : function(v) {
        return v
      };

  if (config.axis_x_tick_format) {
    if (isFunction(config.axis_x_tick_format)) {
      format = config.axis_x_tick_format;
    } else if ($$.isTimeSeries()) {
      format = function(date) {
        return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : ''
      };
    }
  }
  return isFunction(format)
    ? function(v) {
        return format.call($$, v)
      }
    : format
};
Axis.prototype.getTickValues = function getTickValues(tickValues, axis) {
  return tickValues ? tickValues : axis ? axis.tickValues() : undefined
};
Axis.prototype.getXAxisTickValues = function getXAxisTickValues() {
  return this.getTickValues(
    this.owner.config.axis_x_tick_values,
    this.owner.xAxis
  )
};
Axis.prototype.getYAxisTickValues = function getYAxisTickValues() {
  return this.getTickValues(
    this.owner.config.axis_y_tick_values,
    this.owner.yAxis
  )
};
Axis.prototype.getY2AxisTickValues = function getY2AxisTickValues() {
  return this.getTickValues(
    this.owner.config.axis_y2_tick_values,
    this.owner.y2Axis
  )
};
Axis.prototype.getLabelOptionByAxisId = function getLabelOptionByAxisId(
  axisId
) {
  var $$ = this.owner,
    config = $$.config,
    option;
  if (axisId === 'y') {
    option = config.axis_y_label;
  } else if (axisId === 'y2') {
    option = config.axis_y2_label;
  } else if (axisId === 'x') {
    option = config.axis_x_label;
  }
  return option
};
Axis.prototype.getLabelText = function getLabelText(axisId) {
  var option = this.getLabelOptionByAxisId(axisId);
  return isString(option) ? option : option ? option.text : null
};
Axis.prototype.setLabelText = function setLabelText(axisId, text) {
  var $$ = this.owner,
    config = $$.config,
    option = this.getLabelOptionByAxisId(axisId);
  if (isString(option)) {
    if (axisId === 'y') {
      config.axis_y_label = text;
    } else if (axisId === 'y2') {
      config.axis_y2_label = text;
    } else if (axisId === 'x') {
      config.axis_x_label = text;
    }
  } else if (option) {
    option.text = text;
  }
};
Axis.prototype.getLabelPosition = function getLabelPosition(
  axisId,
  defaultPosition
) {
  var option = this.getLabelOptionByAxisId(axisId),
    position =
      option && typeof option === 'object' && option.position
        ? option.position
        : defaultPosition;
  return {
    isInner: position.indexOf('inner') >= 0,
    isOuter: position.indexOf('outer') >= 0,
    isLeft: position.indexOf('left') >= 0,
    isCenter: position.indexOf('center') >= 0,
    isRight: position.indexOf('right') >= 0,
    isTop: position.indexOf('top') >= 0,
    isMiddle: position.indexOf('middle') >= 0,
    isBottom: position.indexOf('bottom') >= 0
  }
};
Axis.prototype.getXAxisLabelPosition = function getXAxisLabelPosition() {
  return this.getLabelPosition(
    'x',
    this.owner.config.axis_rotated ? 'inner-top' : 'inner-right'
  )
};
Axis.prototype.getYAxisLabelPosition = function getYAxisLabelPosition() {
  return this.getLabelPosition(
    'y',
    this.owner.config.axis_rotated ? 'inner-right' : 'inner-top'
  )
};
Axis.prototype.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
  return this.getLabelPosition(
    'y2',
    this.owner.config.axis_rotated ? 'inner-right' : 'inner-top'
  )
};
Axis.prototype.getLabelPositionById = function getLabelPositionById(id) {
  return id === 'y2'
    ? this.getY2AxisLabelPosition()
    : id === 'y'
    ? this.getYAxisLabelPosition()
    : this.getXAxisLabelPosition()
};
Axis.prototype.textForXAxisLabel = function textForXAxisLabel() {
  return this.getLabelText('x')
};
Axis.prototype.textForYAxisLabel = function textForYAxisLabel() {
  return this.getLabelText('y')
};
Axis.prototype.textForY2AxisLabel = function textForY2AxisLabel() {
  return this.getLabelText('y2')
};
Axis.prototype.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
  var $$ = this.owner;
  if (forHorizontal) {
    return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width
  } else {
    return position.isBottom
      ? -$$.height
      : position.isMiddle
      ? -$$.height / 2
      : 0
  }
};
Axis.prototype.dxForAxisLabel = function dxForAxisLabel(
  forHorizontal,
  position
) {
  if (forHorizontal) {
    return position.isLeft ? '0.5em' : position.isRight ? '-0.5em' : '0'
  } else {
    return position.isTop ? '-0.5em' : position.isBottom ? '0.5em' : '0'
  }
};
Axis.prototype.textAnchorForAxisLabel = function textAnchorForAxisLabel(
  forHorizontal,
  position
) {
  if (forHorizontal) {
    return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end'
  } else {
    return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end'
  }
};
Axis.prototype.xForXAxisLabel = function xForXAxisLabel() {
  return this.xForAxisLabel(
    !this.owner.config.axis_rotated,
    this.getXAxisLabelPosition()
  )
};
Axis.prototype.xForYAxisLabel = function xForYAxisLabel() {
  return this.xForAxisLabel(
    this.owner.config.axis_rotated,
    this.getYAxisLabelPosition()
  )
};
Axis.prototype.xForY2AxisLabel = function xForY2AxisLabel() {
  return this.xForAxisLabel(
    this.owner.config.axis_rotated,
    this.getY2AxisLabelPosition()
  )
};
Axis.prototype.dxForXAxisLabel = function dxForXAxisLabel() {
  return this.dxForAxisLabel(
    !this.owner.config.axis_rotated,
    this.getXAxisLabelPosition()
  )
};
Axis.prototype.dxForYAxisLabel = function dxForYAxisLabel() {
  return this.dxForAxisLabel(
    this.owner.config.axis_rotated,
    this.getYAxisLabelPosition()
  )
};
Axis.prototype.dxForY2AxisLabel = function dxForY2AxisLabel() {
  return this.dxForAxisLabel(
    this.owner.config.axis_rotated,
    this.getY2AxisLabelPosition()
  )
};
Axis.prototype.dyForXAxisLabel = function dyForXAxisLabel() {
  var $$ = this.owner,
    config = $$.config,
    position = this.getXAxisLabelPosition();
  if (config.axis_rotated) {
    return position.isInner
      ? '1.2em'
      : -25 - ($$.config.axis_x_inner ? 0 : this.getMaxTickWidth('x'))
  } else {
    return position.isInner ? '-0.5em' : $$.getHorizontalAxisHeight('x') - 10
  }
};
Axis.prototype.dyForYAxisLabel = function dyForYAxisLabel() {
  var $$ = this.owner,
    position = this.getYAxisLabelPosition();
  if ($$.config.axis_rotated) {
    return position.isInner ? '-0.5em' : '3em'
  } else {
    return position.isInner
      ? '1.2em'
      : -10 - ($$.config.axis_y_inner ? 0 : this.getMaxTickWidth('y') + 10)
  }
};
Axis.prototype.dyForY2AxisLabel = function dyForY2AxisLabel() {
  var $$ = this.owner,
    position = this.getY2AxisLabelPosition();
  if ($$.config.axis_rotated) {
    return position.isInner ? '1.2em' : '-2.2em'
  } else {
    return position.isInner
      ? '-0.5em'
      : 15 + ($$.config.axis_y2_inner ? 0 : this.getMaxTickWidth('y2') + 15)
  }
};
Axis.prototype.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
  var $$ = this.owner;
  return this.textAnchorForAxisLabel(
    !$$.config.axis_rotated,
    this.getXAxisLabelPosition()
  )
};
Axis.prototype.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
  var $$ = this.owner;
  return this.textAnchorForAxisLabel(
    $$.config.axis_rotated,
    this.getYAxisLabelPosition()
  )
};
Axis.prototype.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
  var $$ = this.owner;
  return this.textAnchorForAxisLabel(
    $$.config.axis_rotated,
    this.getY2AxisLabelPosition()
  )
};
Axis.prototype.getMaxTickWidth = function getMaxTickWidth(
  id,
  withoutRecompute
) {
  var $$ = this.owner,
    maxWidth = 0,
    targetsToShow,
    scale,
    axis,
    dummy,
    svg;
  if (withoutRecompute && $$.currentMaxTickWidths[id]) {
    return $$.currentMaxTickWidths[id]
  }
  if ($$.svg) {
    targetsToShow = $$.filterTargetsToShow($$.data.targets);
    if (id === 'y') {
      scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
      axis = this.getYAxis(
        id,
        scale,
        $$.yOrient,
        $$.yAxisTickValues,
        false,
        true,
        true
      );
    } else if (id === 'y2') {
      scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
      axis = this.getYAxis(
        id,
        scale,
        $$.y2Orient,
        $$.y2AxisTickValues,
        false,
        true,
        true
      );
    } else {
      scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
      axis = this.getXAxis(
        scale,
        $$.xOrient,
        $$.xAxisTickFormat,
        $$.xAxisTickValues,
        false,
        true,
        true
      );
      this.updateXAxisTickValues(targetsToShow, axis);
    }
    dummy = $$.d3
      .select('body')
      .append('div')
      .classed('c3', true)
    ;(svg = dummy
      .append('svg')
      .style('visibility', 'hidden')
      .style('position', 'fixed')
      .style('top', 0)
      .style('left', 0)),
      svg
        .append('g')
        .call(axis)
        .each(function() {
          $$.d3
            .select(this)
            .selectAll('text')
            .each(function() {
              var box = getBBox(this);
              if (maxWidth < box.width) {
                maxWidth = box.width;
              }
            });
          dummy.remove();
        });
  }
  $$.currentMaxTickWidths[id] =
    maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
  return $$.currentMaxTickWidths[id]
};

Axis.prototype.updateLabels = function updateLabels(withTransition) {
  var $$ = this.owner;
  var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
    axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
    axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label)
  ;(withTransition ? axisXLabel.transition() : axisXLabel)
    .attr('x', this.xForXAxisLabel.bind(this))
    .attr('dx', this.dxForXAxisLabel.bind(this))
    .attr('dy', this.dyForXAxisLabel.bind(this))
    .text(this.textForXAxisLabel.bind(this))
  ;(withTransition ? axisYLabel.transition() : axisYLabel)
    .attr('x', this.xForYAxisLabel.bind(this))
    .attr('dx', this.dxForYAxisLabel.bind(this))
    .attr('dy', this.dyForYAxisLabel.bind(this))
    .text(this.textForYAxisLabel.bind(this))
  ;(withTransition ? axisY2Label.transition() : axisY2Label)
    .attr('x', this.xForY2AxisLabel.bind(this))
    .attr('dx', this.dxForY2AxisLabel.bind(this))
    .attr('dy', this.dyForY2AxisLabel.bind(this))
    .text(this.textForY2AxisLabel.bind(this));
};
Axis.prototype.getPadding = function getPadding(
  padding,
  key,
  defaultValue,
  domainLength
) {
  var p = typeof padding === 'number' ? padding : padding[key];
  if (!isValue(p)) {
    return defaultValue
  }
  if (padding.unit === 'ratio') {
    return padding[key] * domainLength
  }
  // assume padding is pixels if unit is not specified
  return this.convertPixelsToAxisPadding(p, domainLength)
};
Axis.prototype.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(
  pixels,
  domainLength
) {
  var $$ = this.owner,
    length = $$.config.axis_rotated ? $$.width : $$.height;
  return domainLength * (pixels / length)
};
Axis.prototype.generateTickValues = function generateTickValues(
  values,
  tickCount,
  forTimeSeries
) {
  var tickValues = values,
    targetCount,
    start,
    end,
    count,
    interval,
    i,
    tickValue;
  if (tickCount) {
    targetCount = isFunction(tickCount) ? tickCount() : tickCount;
    // compute ticks according to tickCount
    if (targetCount === 1) {
      tickValues = [values[0]];
    } else if (targetCount === 2) {
      tickValues = [values[0], values[values.length - 1]];
    } else if (targetCount > 2) {
      count = targetCount - 2;
      start = values[0];
      end = values[values.length - 1];
      interval = (end - start) / (count + 1);
      // re-construct unique values
      tickValues = [start];
      for (i = 0; i < count; i++) {
        tickValue = +start + interval * (i + 1);
        tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
      }
      tickValues.push(end);
    }
  }
  if (!forTimeSeries) {
    tickValues = tickValues.sort(function(a, b) {
      return a - b
    });
  }
  return tickValues
};
Axis.prototype.generateTransitions = function generateTransitions(duration) {
  var $$ = this.owner,
    axes = $$.axes;
  return {
    axisX: duration ? axes.x.transition().duration(duration) : axes.x,
    axisY: duration ? axes.y.transition().duration(duration) : axes.y,
    axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
    axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
  }
};
Axis.prototype.redraw = function redraw(duration, isHidden) {
  var $$ = this.owner,
    transition = duration ? $$.d3.transition().duration(duration) : null;
  $$.axes.x.style('opacity', isHidden ? 0 : 1).call($$.xAxis, transition);
  $$.axes.y.style('opacity', isHidden ? 0 : 1).call($$.yAxis, transition);
  $$.axes.y2.style('opacity', isHidden ? 0 : 1).call($$.y2Axis, transition);
  $$.axes.subx.style('opacity', isHidden ? 0 : 1).call($$.subXAxis, transition);
};

var c3 = {
  version: '0.7.18',
  chart: {
    fn: Chart.prototype,
    internal: {
      fn: ChartInternal.prototype,
      axis: {
        fn: Axis.prototype,
        internal: {
          fn: AxisInternal.prototype
        }
      }
    }
  },
  generate: function(config) {
    return new Chart(config)
  }
};

ChartInternal.prototype.beforeInit = function() {
  // can do something
};
ChartInternal.prototype.afterInit = function() {
  // can do something
};
ChartInternal.prototype.init = function() {
  var $$ = this,
    config = $$.config;

  $$.initParams();

  if (config.data_url) {
    $$.convertUrlToData(
      config.data_url,
      config.data_mimeType,
      config.data_headers,
      config.data_keys,
      $$.initWithData
    );
  } else if (config.data_json) {
    $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
  } else if (config.data_rows) {
    $$.initWithData($$.convertRowsToData(config.data_rows));
  } else if (config.data_columns) {
    $$.initWithData($$.convertColumnsToData(config.data_columns));
  } else {
    throw Error('url or json or rows or columns is required.')
  }
};

ChartInternal.prototype.initParams = function() {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config;

  // MEMO: clipId needs to be unique because it conflicts when multiple charts exist
  $$.clipId = 'c3-' + new Date().valueOf() + '-clip';
  $$.clipIdForXAxis = $$.clipId + '-xaxis';
  $$.clipIdForYAxis = $$.clipId + '-yaxis';
  $$.clipIdForGrid = $$.clipId + '-grid';
  $$.clipIdForSubchart = $$.clipId + '-subchart';
  $$.clipPath = $$.getClipPath($$.clipId);
  $$.clipPathForXAxis = $$.getClipPath($$.clipIdForXAxis);
  $$.clipPathForYAxis = $$.getClipPath($$.clipIdForYAxis);
  $$.clipPathForGrid = $$.getClipPath($$.clipIdForGrid);
  $$.clipPathForSubchart = $$.getClipPath($$.clipIdForSubchart);

  $$.dragStart = null;
  $$.dragging = false;
  $$.flowing = false;
  $$.cancelClick = false;
  $$.mouseover = undefined;
  $$.transiting = false;

  $$.color = $$.generateColor();
  $$.levelColor = $$.generateLevelColor();

  $$.dataTimeParse = (config.data_xLocaltime ? d3.timeParse : d3.utcParse)(
    $$.config.data_xFormat
  );
  $$.axisTimeFormat = config.axis_x_localtime ? d3.timeFormat : d3.utcFormat;
  $$.defaultAxisTimeFormat = function(date) {
    if (date.getMilliseconds()) {
      return d3.timeFormat('.%L')(date)
    }
    if (date.getSeconds()) {
      return d3.timeFormat(':%S')(date)
    }
    if (date.getMinutes()) {
      return d3.timeFormat('%I:%M')(date)
    }
    if (date.getHours()) {
      return d3.timeFormat('%I %p')(date)
    }
    if (date.getDay() && date.getDate() !== 1) {
      return d3.timeFormat('%-m/%-d')(date)
    }
    if (date.getDate() !== 1) {
      return d3.timeFormat('%-m/%-d')(date)
    }
    if (date.getMonth()) {
      return d3.timeFormat('%-m/%-d')(date)
    }
    return d3.timeFormat('%Y/%-m/%-d')(date)
  };
  $$.hiddenTargetIds = [];
  $$.hiddenLegendIds = [];
  $$.focusedTargetIds = [];
  $$.defocusedTargetIds = [];

  $$.xOrient = config.axis_rotated
    ? config.axis_x_inner
      ? 'right'
      : 'left'
    : config.axis_x_inner
    ? 'top'
    : 'bottom';
  $$.yOrient = config.axis_rotated
    ? config.axis_y_inner
      ? 'top'
      : 'bottom'
    : config.axis_y_inner
    ? 'right'
    : 'left';
  $$.y2Orient = config.axis_rotated
    ? config.axis_y2_inner
      ? 'bottom'
      : 'top'
    : config.axis_y2_inner
    ? 'left'
    : 'right';
  $$.subXOrient = config.axis_rotated ? 'left' : 'bottom';

  $$.isLegendRight = config.legend_position === 'right';
  $$.isLegendInset = config.legend_position === 'inset';
  $$.isLegendTop =
    config.legend_inset_anchor === 'top-left' ||
    config.legend_inset_anchor === 'top-right';
  $$.isLegendLeft =
    config.legend_inset_anchor === 'top-left' ||
    config.legend_inset_anchor === 'bottom-left';
  $$.legendStep = 0;
  $$.legendItemWidth = 0;
  $$.legendItemHeight = 0;

  $$.currentMaxTickWidths = {
    x: 0,
    y: 0,
    y2: 0
  };

  $$.rotated_padding_left = 30;
  $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
  $$.rotated_padding_top = 5;

  $$.withoutFadeIn = {};

  $$.intervalForObserveInserted = undefined;

  $$.axes.subx = d3.selectAll([]); // needs when excluding subchart.js
};

ChartInternal.prototype.initChartElements = function() {
  if (this.initBar) {
    this.initBar();
  }
  if (this.initLine) {
    this.initLine();
  }
  if (this.initArc) {
    this.initArc();
  }
  if (this.initGauge) {
    this.initGauge();
  }
  if (this.initText) {
    this.initText();
  }
};

ChartInternal.prototype.initWithData = function(data) {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config;
  var defs,
    main,
    binding = true;

  $$.axis = new Axis($$);

  if (!config.bindto) {
    $$.selectChart = d3.selectAll([]);
  } else if (typeof config.bindto.node === 'function') {
    $$.selectChart = config.bindto;
  } else {
    $$.selectChart = d3.select(config.bindto);
  }
  if ($$.selectChart.empty()) {
    $$.selectChart = d3
      .select(document.createElement('div'))
      .style('opacity', 0);
    $$.observeInserted($$.selectChart);
    binding = false;
  }
  $$.selectChart.html('').classed('c3', true);

  // Init data as targets
  $$.data.xs = {};
  $$.data.targets = $$.convertDataToTargets(data);

  if (config.data_filter) {
    $$.data.targets = $$.data.targets.filter(config.data_filter);
  }

  // Set targets to hide if needed
  if (config.data_hide) {
    $$.addHiddenTargetIds(
      config.data_hide === true
        ? $$.mapToIds($$.data.targets)
        : config.data_hide
    );
  }
  if (config.legend_hide) {
    $$.addHiddenLegendIds(
      config.legend_hide === true
        ? $$.mapToIds($$.data.targets)
        : config.legend_hide
    );
  }

  if ($$.isStanfordGraphType()) {
    $$.initStanfordData();
  }

  // Init sizes and scales
  $$.updateSizes();
  $$.updateScales();

  // Set domains for each scale
  $$.x.domain(d3.extent($$.getXDomain($$.data.targets)));
  $$.y.domain($$.getYDomain($$.data.targets, 'y'));
  $$.y2.domain($$.getYDomain($$.data.targets, 'y2'));
  $$.subX.domain($$.x.domain());
  $$.subY.domain($$.y.domain());
  $$.subY2.domain($$.y2.domain());

  // Save original x domain for zoom update
  $$.orgXDomain = $$.x.domain();

  /*-- Basic Elements --*/

  // Define svgs
  $$.svg = $$.selectChart
    .append('svg')
    .style('overflow', 'hidden')
    .on('mouseenter', function() {
      return config.onmouseover.call($$)
    })
    .on('mouseleave', function() {
      return config.onmouseout.call($$)
    });

  if ($$.config.svg_classname) {
    $$.svg.attr('class', $$.config.svg_classname);
  }

  // Define defs
  defs = $$.svg.append('defs');
  $$.clipChart = $$.appendClip(defs, $$.clipId);
  $$.clipXAxis = $$.appendClip(defs, $$.clipIdForXAxis);
  $$.clipYAxis = $$.appendClip(defs, $$.clipIdForYAxis);
  $$.clipGrid = $$.appendClip(defs, $$.clipIdForGrid);
  $$.clipSubchart = $$.appendClip(defs, $$.clipIdForSubchart);
  $$.updateSvgSize();

  // Define regions
  main = $$.main = $$.svg.append('g').attr('transform', $$.getTranslate('main'));

  if ($$.initPie) {
    $$.initPie();
  }
  if ($$.initDragZoom) {
    $$.initDragZoom();
  }
  if (config.subchart_show && $$.initSubchart) {
    $$.initSubchart();
  }
  if ($$.initTooltip) {
    $$.initTooltip();
  }
  if ($$.initLegend) {
    $$.initLegend();
  }
  if ($$.initTitle) {
    $$.initTitle();
  }
  if ($$.initZoom) {
    $$.initZoom();
  }
  if ($$.isStanfordGraphType()) {
    $$.drawColorScale();
  }

  // Update selection based on size and scale
  // TODO: currently this must be called after initLegend because of update of sizes, but it should be done in initSubchart.
  if (config.subchart_show && $$.initSubchartBrush) {
    $$.initSubchartBrush();
  }

  /*-- Main Region --*/

  // text when empty
  main
    .append('text')
    .attr('class', CLASS.text + ' ' + CLASS.empty)
    .attr('text-anchor', 'middle') // horizontal centering of text at x position in all browsers.
    .attr('dominant-baseline', 'middle'); // vertical centering of text at y position in all browsers, except IE.

  // Regions
  $$.initRegion();

  // Grids
  $$.initGrid();

  // Define g for chart area
  main
    .append('g')
    .attr('clip-path', $$.clipPath)
    .attr('class', CLASS.chart);

  // Grid lines
  if (config.grid_lines_front) {
    $$.initGridLines();
  }

  $$.initStanfordElements();

  // Cover whole with rects for events
  $$.initEventRect();

  // Define g for chart
  $$.initChartElements();

  // Add Axis
  $$.axis.init();

  // Set targets
  $$.updateTargets($$.data.targets);

  // Set default extent if defined
  if (config.axis_x_selection) {
    $$.brush.selectionAsValue($$.getDefaultSelection());
  }

  // Draw with targets
  if (binding) {
    $$.updateDimension();
    $$.config.oninit.call($$);
    $$.redraw({
      withTransition: false,
      withTransform: true,
      withUpdateXDomain: true,
      withUpdateOrgXDomain: true,
      withTransitionForAxis: false
    });
  }

  // Bind to resize event
  $$.bindResize();

  // Bind to window focus event
  $$.bindWindowFocus();

  // export element of the chart
  $$.api.element = $$.selectChart.node();
};

ChartInternal.prototype.smoothLines = function(el, type) {
  var $$ = this;
  if (type === 'grid') {
    el.each(function() {
      var g = $$.d3.select(this),
        x1 = g.attr('x1'),
        x2 = g.attr('x2'),
        y1 = g.attr('y1'),
        y2 = g.attr('y2');
      g.attr({
        x1: Math.ceil(x1),
        x2: Math.ceil(x2),
        y1: Math.ceil(y1),
        y2: Math.ceil(y2)
      });
    });
  }
};

ChartInternal.prototype.updateSizes = function() {
  var $$ = this,
    config = $$.config;
  var legendHeight = $$.legend ? $$.getLegendHeight() : 0,
    legendWidth = $$.legend ? $$.getLegendWidth() : 0,
    legendHeightForBottom =
      $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
    hasArc = $$.hasArcType(),
    xAxisHeight =
      config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
    subchartHeight =
      config.subchart_show && !hasArc
        ? config.subchart_size_height + xAxisHeight
        : 0;

  $$.currentWidth = $$.getCurrentWidth();
  $$.currentHeight = $$.getCurrentHeight();

  // for main
  $$.margin = config.axis_rotated
    ? {
        top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
        right: hasArc ? 0 : $$.getCurrentPaddingRight(),
        bottom:
          $$.getHorizontalAxisHeight('y') +
          legendHeightForBottom +
          $$.getCurrentPaddingBottom(),
        left: subchartHeight + (hasArc ? 0 : $$.getCurrentPaddingLeft())
      }
    : {
        top: 4 + $$.getCurrentPaddingTop(), // for top tick text
        right: hasArc ? 0 : $$.getCurrentPaddingRight(),
        bottom:
          xAxisHeight +
          subchartHeight +
          legendHeightForBottom +
          $$.getCurrentPaddingBottom(),
        left: hasArc ? 0 : $$.getCurrentPaddingLeft()
      };

  // for subchart
  $$.margin2 = config.axis_rotated
    ? {
        top: $$.margin.top,
        right: NaN,
        bottom: 20 + legendHeightForBottom,
        left: $$.rotated_padding_left
      }
    : {
        top: $$.currentHeight - subchartHeight - legendHeightForBottom,
        right: NaN,
        bottom: xAxisHeight + legendHeightForBottom,
        left: $$.margin.left
      };

  // for legend
  $$.margin3 = {
    top: 0,
    right: NaN,
    bottom: 0,
    left: 0
  };
  if ($$.updateSizeForLegend) {
    $$.updateSizeForLegend(legendHeight, legendWidth);
  }

  $$.width = $$.currentWidth - $$.margin.left - $$.margin.right;
  $$.height = $$.currentHeight - $$.margin.top - $$.margin.bottom;
  if ($$.width < 0) {
    $$.width = 0;
  }
  if ($$.height < 0) {
    $$.height = 0;
  }

  $$.width2 = config.axis_rotated
    ? $$.margin.left - $$.rotated_padding_left - $$.rotated_padding_right
    : $$.width;
  $$.height2 = config.axis_rotated
    ? $$.height
    : $$.currentHeight - $$.margin2.top - $$.margin2.bottom;
  if ($$.width2 < 0) {
    $$.width2 = 0;
  }
  if ($$.height2 < 0) {
    $$.height2 = 0;
  }

  // for arc
  $$.arcWidth = $$.width - ($$.isLegendRight ? legendWidth + 10 : 0);
  $$.arcHeight = $$.height - ($$.isLegendRight ? 0 : 10);
  if ($$.hasType('gauge') && !config.gauge_fullCircle) {
    $$.arcHeight += $$.height - $$.getGaugeLabelHeight();
  }
  if ($$.updateRadius) {
    $$.updateRadius();
  }

  if ($$.isLegendRight && hasArc) {
    $$.margin3.left = $$.arcWidth / 2 + $$.radiusExpanded * 1.1;
  }
};

ChartInternal.prototype.updateTargets = function(targets) {
  var $$ = this,
    config = $$.config;

  /*-- Main --*/

  //-- Text --//
  $$.updateTargetsForText(targets);

  //-- Bar --//
  $$.updateTargetsForBar(targets);

  //-- Line --//
  $$.updateTargetsForLine(targets);

  //-- Arc --//
  if ($$.hasArcType() && $$.updateTargetsForArc) {
    $$.updateTargetsForArc(targets);
  }

  /*-- Sub --*/

  if (config.subchart_show && $$.updateTargetsForSubchart) {
    $$.updateTargetsForSubchart(targets);
  }

  // Fade-in each chart
  $$.showTargets();
};
ChartInternal.prototype.showTargets = function() {
  var $$ = this;
  $$.svg
    .selectAll('.' + CLASS.target)
    .filter(function(d) {
      return $$.isTargetToShow(d.id)
    })
    .transition()
    .duration($$.config.transition_duration)
    .style('opacity', 1);
};

ChartInternal.prototype.redraw = function(options, transitions) {
  var $$ = this,
    main = $$.main,
    d3 = $$.d3,
    config = $$.config;
  var areaIndices = $$.getShapeIndices($$.isAreaType),
    barIndices = $$.getShapeIndices($$.isBarType),
    lineIndices = $$.getShapeIndices($$.isLineType);
  var withY,
    withSubchart,
    withTransition,
    withTransitionForExit,
    withTransitionForAxis,
    withTransform,
    withUpdateXDomain,
    withUpdateOrgXDomain,
    withTrimXDomain,
    withLegend,
    withEventRect,
    withDimension,
    withUpdateXAxis;
  var hideAxis = $$.hasArcType();
  var drawArea, drawBar, drawLine, xForText, yForText;
  var duration, durationForExit, durationForAxis;
  var transitionsToWait, waitForDraw, flow, transition;
  var targetsToShow = $$.filterTargetsToShow($$.data.targets),
    tickValues,
    i,
    intervalForCulling,
    xDomainForZoom;
  var xv = $$.xv.bind($$),
    cx,
    cy;

  options = options || {};
  withY = getOption(options, 'withY', true);
  withSubchart = getOption(options, 'withSubchart', true);
  withTransition = getOption(options, 'withTransition', true);
  withTransform = getOption(options, 'withTransform', false);
  withUpdateXDomain = getOption(options, 'withUpdateXDomain', false);
  withUpdateOrgXDomain = getOption(options, 'withUpdateOrgXDomain', false);
  withTrimXDomain = getOption(options, 'withTrimXDomain', true);
  withUpdateXAxis = getOption(options, 'withUpdateXAxis', withUpdateXDomain);
  withLegend = getOption(options, 'withLegend', false);
  withEventRect = getOption(options, 'withEventRect', true);
  withDimension = getOption(options, 'withDimension', true);
  withTransitionForExit = getOption(
    options,
    'withTransitionForExit',
    withTransition
  );
  withTransitionForAxis = getOption(
    options,
    'withTransitionForAxis',
    withTransition
  );

  duration = withTransition ? config.transition_duration : 0;
  durationForExit = withTransitionForExit ? duration : 0;
  durationForAxis = withTransitionForAxis ? duration : 0;

  transitions = transitions || $$.axis.generateTransitions(durationForAxis);

  // update legend and transform each g
  if (withLegend && config.legend_show) {
    $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
  } else if (withDimension) {
    // need to update dimension (e.g. axis.y.tick.values) because y tick values should change
    // no need to update axis in it because they will be updated in redraw()
    $$.updateDimension(true);
  }

  // MEMO: needed for grids calculation
  if ($$.isCategorized() && targetsToShow.length === 0) {
    $$.x.domain([0, $$.axes.x.selectAll('.tick').size()]);
  }

  if (targetsToShow.length) {
    $$.updateXDomain(
      targetsToShow,
      withUpdateXDomain,
      withUpdateOrgXDomain,
      withTrimXDomain
    );
    if (!config.axis_x_tick_values) {
      tickValues = $$.axis.updateXAxisTickValues(targetsToShow);
    }
  } else {
    $$.xAxis.tickValues([]);
    $$.subXAxis.tickValues([]);
  }

  if (config.zoom_rescale && !options.flow) {
    xDomainForZoom = $$.x.orgDomain();
  }

  $$.y.domain($$.getYDomain(targetsToShow, 'y', xDomainForZoom));
  $$.y2.domain($$.getYDomain(targetsToShow, 'y2', xDomainForZoom));

  if (!config.axis_y_tick_values && config.axis_y_tick_count) {
    $$.yAxis.tickValues(
      $$.axis.generateTickValues($$.y.domain(), config.axis_y_tick_count)
    );
  }
  if (!config.axis_y2_tick_values && config.axis_y2_tick_count) {
    $$.y2Axis.tickValues(
      $$.axis.generateTickValues($$.y2.domain(), config.axis_y2_tick_count)
    );
  }

  // axes
  $$.axis.redraw(durationForAxis, hideAxis);

  // Update axis label
  $$.axis.updateLabels(withTransition);

  // show/hide if manual culling needed
  if ((withUpdateXDomain || withUpdateXAxis) && targetsToShow.length) {
    if (config.axis_x_tick_culling && tickValues) {
      for (i = 1; i < tickValues.length; i++) {
        if (tickValues.length / i < config.axis_x_tick_culling_max) {
          intervalForCulling = i;
          break
        }
      }
      $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').each(function(e) {
        var index = tickValues.indexOf(e);
        if (index >= 0) {
          d3.select(this).style(
            'display',
            index % intervalForCulling ? 'none' : 'block'
          );
        }
      });
    } else {
      $$.svg
        .selectAll('.' + CLASS.axisX + ' .tick text')
        .style('display', 'block');
    }
  }

  // setup drawer - MEMO: these must be called after axis updated
  drawArea = $$.generateDrawArea
    ? $$.generateDrawArea(areaIndices, false)
    : undefined;
  drawBar = $$.generateDrawBar ? $$.generateDrawBar(barIndices) : undefined;
  drawLine = $$.generateDrawLine
    ? $$.generateDrawLine(lineIndices, false)
    : undefined;
  xForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, true);
  yForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, false);

  // update circleY based on updated parameters
  $$.updateCircleY();
  // generate circle x/y functions depending on updated params
  cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$);
  cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);

  // Update sub domain
  if (withY) {
    $$.subY.domain($$.getYDomain(targetsToShow, 'y'));
    $$.subY2.domain($$.getYDomain(targetsToShow, 'y2'));
  }

  // xgrid focus
  $$.updateXgridFocus();

  // Data empty label positioning and text.
  main
    .select('text.' + CLASS.text + '.' + CLASS.empty)
    .attr('x', $$.width / 2)
    .attr('y', $$.height / 2)
    .text(config.data_empty_label_text)
    .transition()
    .style('opacity', targetsToShow.length ? 0 : 1);

  // event rect
  if (withEventRect) {
    $$.redrawEventRect();
  }

  // grid
  $$.updateGrid(duration);

  $$.updateStanfordElements(duration);

  // rect for regions
  $$.updateRegion(duration);

  // bars
  $$.updateBar(durationForExit);

  // lines, areas and circles
  $$.updateLine(durationForExit);
  $$.updateArea(durationForExit);
  $$.updateCircle(cx, cy);

  // text
  if ($$.hasDataLabel()) {
    $$.updateText(xForText, yForText, durationForExit);
  }

  // title
  if ($$.redrawTitle) {
    $$.redrawTitle();
  }

  // arc
  if ($$.redrawArc) {
    $$.redrawArc(duration, durationForExit, withTransform);
  }

  // subchart
  if (config.subchart_show && $$.redrawSubchart) {
    $$.redrawSubchart(
      withSubchart,
      transitions,
      duration,
      durationForExit,
      areaIndices,
      barIndices,
      lineIndices
    );
  }

  if ($$.isStanfordGraphType()) {
    $$.drawColorScale();
  }

  // circles for select
  main
    .selectAll('.' + CLASS.selectedCircles)
    .filter($$.isBarType.bind($$))
    .selectAll('circle')
    .remove();

  if (options.flow) {
    flow = $$.generateFlow({
      targets: targetsToShow,
      flow: options.flow,
      duration: options.flow.duration,
      drawBar: drawBar,
      drawLine: drawLine,
      drawArea: drawArea,
      cx: cx,
      cy: cy,
      xv: xv,
      xForText: xForText,
      yForText: yForText
    });
  }

  if (duration && $$.isTabVisible()) {
    // Only use transition if tab visible. See #938.
    // transition should be derived from one transition
    transition = d3.transition().duration(duration);
    transitionsToWait = []
    ;[
      $$.redrawBar(drawBar, true, transition),
      $$.redrawLine(drawLine, true, transition),
      $$.redrawArea(drawArea, true, transition),
      $$.redrawCircle(cx, cy, true, transition),
      $$.redrawText(xForText, yForText, options.flow, true, transition),
      $$.redrawRegion(true, transition),
      $$.redrawGrid(true, transition)
    ].forEach(function(transitions) {
      transitions.forEach(function(transition) {
        transitionsToWait.push(transition);
      });
    });
    // Wait for end of transitions to call flow and onrendered callback
    waitForDraw = $$.generateWait();
    transitionsToWait.forEach(function(t) {
      waitForDraw.add(t);
    });
    waitForDraw(function() {
      if (flow) {
        flow();
      }
      if (config.onrendered) {
        config.onrendered.call($$);
      }
    });
  } else {
    $$.redrawBar(drawBar);
    $$.redrawLine(drawLine);
    $$.redrawArea(drawArea);
    $$.redrawCircle(cx, cy);
    $$.redrawText(xForText, yForText, options.flow);
    $$.redrawRegion();
    $$.redrawGrid();
    if (flow) {
      flow();
    }
    if (config.onrendered) {
      config.onrendered.call($$);
    }
  }

  // update fadein condition
  $$.mapToIds($$.data.targets).forEach(function(id) {
    $$.withoutFadeIn[id] = true;
  });
};

ChartInternal.prototype.updateAndRedraw = function(options) {
  var $$ = this,
    config = $$.config,
    transitions;
  options = options || {};
  // same with redraw
  options.withTransition = getOption(options, 'withTransition', true);
  options.withTransform = getOption(options, 'withTransform', false);
  options.withLegend = getOption(options, 'withLegend', false);
  // NOT same with redraw
  options.withUpdateXDomain = getOption(options, 'withUpdateXDomain', true);
  options.withUpdateOrgXDomain = getOption(
    options,
    'withUpdateOrgXDomain',
    true
  );
  options.withTransitionForExit = false;
  options.withTransitionForTransform = getOption(
    options,
    'withTransitionForTransform',
    options.withTransition
  );
  // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)
  $$.updateSizes();
  // MEMO: called in updateLegend in redraw if withLegend
  if (!(options.withLegend && config.legend_show)) {
    transitions = $$.axis.generateTransitions(
      options.withTransitionForAxis ? config.transition_duration : 0
    );
    // Update scales
    $$.updateScales();
    $$.updateSvgSize();
    // Update g positions
    $$.transformAll(options.withTransitionForTransform, transitions);
  }
  // Draw with new sizes & scales
  $$.redraw(options, transitions);
};
ChartInternal.prototype.redrawWithoutRescale = function() {
  this.redraw({
    withY: false,
    withSubchart: false,
    withEventRect: false,
    withTransitionForAxis: false
  });
};

ChartInternal.prototype.isTimeSeries = function() {
  return this.config.axis_x_type === 'timeseries'
};
ChartInternal.prototype.isCategorized = function() {
  return this.config.axis_x_type.indexOf('categor') >= 0
};
ChartInternal.prototype.isCustomX = function() {
  var $$ = this,
    config = $$.config;
  return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs))
};

ChartInternal.prototype.isTimeSeriesY = function() {
  return this.config.axis_y_type === 'timeseries'
};

ChartInternal.prototype.getTranslate = function(target) {
  var $$ = this,
    config = $$.config,
    x,
    y;
  if (target === 'main') {
    x = asHalfPixel($$.margin.left);
    y = asHalfPixel($$.margin.top);
  } else if (target === 'context') {
    x = asHalfPixel($$.margin2.left);
    y = asHalfPixel($$.margin2.top);
  } else if (target === 'legend') {
    x = $$.margin3.left;
    y = $$.margin3.top;
  } else if (target === 'x') {
    x = 0;
    y = config.axis_rotated ? 0 : $$.height;
  } else if (target === 'y') {
    x = 0;
    y = config.axis_rotated ? $$.height : 0;
  } else if (target === 'y2') {
    x = config.axis_rotated ? 0 : $$.width;
    y = config.axis_rotated ? 1 : 0;
  } else if (target === 'subx') {
    x = 0;
    y = config.axis_rotated ? 0 : $$.height2;
  } else if (target === 'arc') {
    x = $$.arcWidth / 2;
    y = $$.arcHeight / 2 - ($$.hasType('gauge') ? 6 : 0); // to prevent wrong display of min and max label
  }
  return 'translate(' + x + ',' + y + ')'
};
ChartInternal.prototype.initialOpacity = function(d) {
  return d.value !== null && this.withoutFadeIn[d.id] ? 1 : 0
};
ChartInternal.prototype.initialOpacityForCircle = function(d) {
  return d.value !== null && this.withoutFadeIn[d.id]
    ? this.opacityForCircle(d)
    : 0
};
ChartInternal.prototype.opacityForCircle = function(d) {
  var isPointShouldBeShown = isFunction(this.config.point_show)
    ? this.config.point_show(d)
    : this.config.point_show;
  var opacity = isPointShouldBeShown || this.isStanfordType(d) ? 1 : 0;
  return isValue(d.value) ? (this.isScatterType(d) ? 0.5 : opacity) : 0
};
ChartInternal.prototype.opacityForText = function() {
  return this.hasDataLabel() ? 1 : 0
};
ChartInternal.prototype.xx = function(d) {
  return d ? this.x(d.x) : null
};
ChartInternal.prototype.xvCustom = function(d, xyValue) {
  var $$ = this,
    value = xyValue ? d[xyValue] : d.value;
  if ($$.isTimeSeries()) {
    value = $$.parseDate(d.value);
  } else if ($$.isCategorized() && typeof d.value === 'string') {
    value = $$.config.axis_x_categories.indexOf(d.value);
  }
  return Math.ceil($$.x(value))
};
ChartInternal.prototype.yvCustom = function(d, xyValue) {
  var $$ = this,
    yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y,
    value = xyValue ? d[xyValue] : d.value;
  return Math.ceil(yScale(value))
};
ChartInternal.prototype.xv = function(d) {
  var $$ = this,
    value = d.value;
  if ($$.isTimeSeries()) {
    value = $$.parseDate(d.value);
  } else if ($$.isCategorized() && typeof d.value === 'string') {
    value = $$.config.axis_x_categories.indexOf(d.value);
  }
  return Math.ceil($$.x(value))
};
ChartInternal.prototype.yv = function(d) {
  var $$ = this,
    yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
  return Math.ceil(yScale(d.value))
};
ChartInternal.prototype.subxx = function(d) {
  return d ? this.subX(d.x) : null
};

ChartInternal.prototype.transformMain = function(withTransition, transitions) {
  var $$ = this,
    xAxis,
    yAxis,
    y2Axis;
  if (transitions && transitions.axisX) {
    xAxis = transitions.axisX;
  } else {
    xAxis = $$.main.select('.' + CLASS.axisX);
    if (withTransition) {
      xAxis = xAxis.transition();
    }
  }
  if (transitions && transitions.axisY) {
    yAxis = transitions.axisY;
  } else {
    yAxis = $$.main.select('.' + CLASS.axisY);
    if (withTransition) {
      yAxis = yAxis.transition();
    }
  }
  if (transitions && transitions.axisY2) {
    y2Axis = transitions.axisY2;
  } else {
    y2Axis = $$.main.select('.' + CLASS.axisY2);
    if (withTransition) {
      y2Axis = y2Axis.transition();
    }
  }
(withTransition ? $$.main.transition() : $$.main).attr(
    'transform',
    $$.getTranslate('main')
  );
  xAxis.attr('transform', $$.getTranslate('x'));
  yAxis.attr('transform', $$.getTranslate('y'));
  y2Axis.attr('transform', $$.getTranslate('y2'));
  $$.main
    .select('.' + CLASS.chartArcs)
    .attr('transform', $$.getTranslate('arc'));
};
ChartInternal.prototype.transformAll = function(withTransition, transitions) {
  var $$ = this;
  $$.transformMain(withTransition, transitions);
  if ($$.config.subchart_show) {
    $$.transformContext(withTransition, transitions);
  }
  if ($$.legend) {
    $$.transformLegend(withTransition);
  }
};

ChartInternal.prototype.updateSvgSize = function() {
  var $$ = this,
    brush = $$.svg.select(`.${CLASS.brush} .overlay`);
  $$.svg.attr('width', $$.currentWidth).attr('height', $$.currentHeight);
  $$.svg
    .selectAll(['#' + $$.clipId, '#' + $$.clipIdForGrid])
    .select('rect')
    .attr('width', $$.width)
    .attr('height', $$.height);
  $$.svg
    .select('#' + $$.clipIdForXAxis)
    .select('rect')
    .attr('x', $$.getXAxisClipX.bind($$))
    .attr('y', $$.getXAxisClipY.bind($$))
    .attr('width', $$.getXAxisClipWidth.bind($$))
    .attr('height', $$.getXAxisClipHeight.bind($$));
  $$.svg
    .select('#' + $$.clipIdForYAxis)
    .select('rect')
    .attr('x', $$.getYAxisClipX.bind($$))
    .attr('y', $$.getYAxisClipY.bind($$))
    .attr('width', $$.getYAxisClipWidth.bind($$))
    .attr('height', $$.getYAxisClipHeight.bind($$));
  $$.svg
    .select('#' + $$.clipIdForSubchart)
    .select('rect')
    .attr('width', $$.width)
    .attr('height', (brush.size() && brush.attr('height')) || 0);
  // MEMO: parent div's height will be bigger than svg when <!DOCTYPE html>
  $$.selectChart.style('max-height', $$.currentHeight + 'px');
};

ChartInternal.prototype.updateDimension = function(withoutAxis) {
  var $$ = this;
  if (!withoutAxis) {
    if ($$.config.axis_rotated) {
      $$.axes.x.call($$.xAxis);
      $$.axes.subx.call($$.subXAxis);
    } else {
      $$.axes.y.call($$.yAxis);
      $$.axes.y2.call($$.y2Axis);
    }
  }
  $$.updateSizes();
  $$.updateScales();
  $$.updateSvgSize();
  $$.transformAll(false);
};

ChartInternal.prototype.observeInserted = function(selection) {
  var $$ = this,
    observer;
  if (typeof MutationObserver === 'undefined') {
    window.console.error('MutationObserver not defined.');
    return
  }
  observer = new MutationObserver(function(mutations) {
    mutations.forEach(function(mutation) {
      if (mutation.type === 'childList' && mutation.previousSibling) {
        observer.disconnect();
        // need to wait for completion of load because size calculation requires the actual sizes determined after that completion
        $$.intervalForObserveInserted = window.setInterval(function() {
          // parentNode will NOT be null when completed
          if (selection.node().parentNode) {
            window.clearInterval($$.intervalForObserveInserted);
            $$.updateDimension();
            if ($$.brush) {
              $$.brush.update();
            }
            $$.config.oninit.call($$);
            $$.redraw({
              withTransform: true,
              withUpdateXDomain: true,
              withUpdateOrgXDomain: true,
              withTransition: false,
              withTransitionForTransform: false,
              withLegend: true
            });
            selection.transition().style('opacity', 1);
          }
        }, 10);
      }
    });
  });
  observer.observe(selection.node(), {
    attributes: true,
    childList: true,
    characterData: true
  });
};

/**
 * Binds handlers to the window resize event.
 */
ChartInternal.prototype.bindResize = function() {
  var $$ = this,
    config = $$.config;

  $$.resizeFunction = $$.generateResize(); // need to call .remove

  $$.resizeFunction.add(function() {
    config.onresize.call($$);
  });
  if (config.resize_auto) {
    $$.resizeFunction.add(function() {
      if ($$.resizeTimeout !== undefined) {
        window.clearTimeout($$.resizeTimeout);
      }
      $$.resizeTimeout = window.setTimeout(function() {
        delete $$.resizeTimeout;
        $$.updateAndRedraw({
          withUpdateXDomain: false,
          withUpdateOrgXDomain: false,
          withTransition: false,
          withTransitionForTransform: false,
          withLegend: true
        });
        if ($$.brush) {
          $$.brush.update();
        }
      }, 100);
    });
  }
  $$.resizeFunction.add(function() {
    config.onresized.call($$);
  });

  $$.resizeIfElementDisplayed = function() {
    // if element not displayed skip it
    if ($$.api == null || !$$.api.element.offsetParent) {
      return
    }

    $$.resizeFunction();
  };

  if (window.attachEvent) {
    window.attachEvent('onresize', $$.resizeIfElementDisplayed);
  } else if (window.addEventListener) {
    window.addEventListener('resize', $$.resizeIfElementDisplayed, false);
  } else {
    // fallback to this, if this is a very old browser
    var wrapper = window.onresize;
    if (!wrapper) {
      // create a wrapper that will call all charts
      wrapper = $$.generateResize();
    } else if (!wrapper.add || !wrapper.remove) {
      // there is already a handler registered, make sure we call it too
      wrapper = $$.generateResize();
      wrapper.add(window.onresize);
    }
    // add this graph to the wrapper, we will be removed if the user calls destroy
    wrapper.add($$.resizeFunction);
    window.onresize = function() {
      // if element not displayed skip it
      if (!$$.api.element.offsetParent) {
        return
      }

      wrapper();
    };
  }
};

/**
 * Binds handlers to the window focus event.
 */
ChartInternal.prototype.bindWindowFocus = function() {
  if (this.windowFocusHandler) {
    // The handler is already set
    return
  }

  this.windowFocusHandler = () => {
    this.redraw();
  };

  window.addEventListener('focus', this.windowFocusHandler);
};

/**
 * Unbinds from the window focus event.
 */
ChartInternal.prototype.unbindWindowFocus = function() {
  window.removeEventListener('focus', this.windowFocusHandler);
  delete this.windowFocusHandler;
};

ChartInternal.prototype.generateResize = function() {
  var resizeFunctions = [];

  function callResizeFunctions() {
    resizeFunctions.forEach(function(f) {
      f();
    });
  }
  callResizeFunctions.add = function(f) {
    resizeFunctions.push(f);
  };
  callResizeFunctions.remove = function(f) {
    for (var i = 0; i < resizeFunctions.length; i++) {
      if (resizeFunctions[i] === f) {
        resizeFunctions.splice(i, 1);
        break
      }
    }
  };
  return callResizeFunctions
};

ChartInternal.prototype.endall = function(transition, callback) {
  var n = 0;
  transition
    .each(function() {
      ++n;
    })
    .on('end', function() {
      if (!--n) {
        callback.apply(this, arguments);
      }
    });
};
ChartInternal.prototype.generateWait = function() {
  var $$ = this;
  var transitionsToWait = [],
    f = function(callback) {
      var timer = setInterval(function() {
        if (!$$.isTabVisible()) {
          return
        }

        var done = 0;
        transitionsToWait.forEach(function(t) {
          if (t.empty()) {
            done += 1;
            return
          }
          try {
            t.transition();
          } catch (e) {
            done += 1;
          }
        });
        if (done === transitionsToWait.length) {
          clearInterval(timer);
          if (callback) {
            callback();
          }
        }
      }, 50);
    };
  f.add = function(transition) {
    transitionsToWait.push(transition);
  };
  return f
};

ChartInternal.prototype.parseDate = function(date) {
  var $$ = this,
    parsedDate;
  if (date instanceof Date) {
    parsedDate = date;
  } else if (typeof date === 'string') {
    parsedDate = $$.dataTimeParse(date);
  } else if (typeof date === 'object') {
    parsedDate = new Date(+date);
  } else if (typeof date === 'number' && !isNaN(date)) {
    parsedDate = new Date(+date);
  }
  if (!parsedDate || isNaN(+parsedDate)) {
    window.console.error("Failed to parse x '" + date + "' to Date object");
  }
  return parsedDate
};

ChartInternal.prototype.isTabVisible = function() {
  return !document.hidden
};

ChartInternal.prototype.getPathBox = getPathBox;
ChartInternal.prototype.CLASS = CLASS;

/* jshint ignore:start */
(function() {
  if (!('SVGPathSeg' in window)) {
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg
    window.SVGPathSeg = function(type, typeAsLetter, owningPathSegList) {
      this.pathSegType = type;
      this.pathSegTypeAsLetter = typeAsLetter;
      this._owningPathSegList = owningPathSegList;
    };

    window.SVGPathSeg.prototype.classname = 'SVGPathSeg';

    window.SVGPathSeg.PATHSEG_UNKNOWN = 0;
    window.SVGPathSeg.PATHSEG_CLOSEPATH = 1;
    window.SVGPathSeg.PATHSEG_MOVETO_ABS = 2;
    window.SVGPathSeg.PATHSEG_MOVETO_REL = 3;
    window.SVGPathSeg.PATHSEG_LINETO_ABS = 4;
    window.SVGPathSeg.PATHSEG_LINETO_REL = 5;
    window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6;
    window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7;
    window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8;
    window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9;
    window.SVGPathSeg.PATHSEG_ARC_ABS = 10;
    window.SVGPathSeg.PATHSEG_ARC_REL = 11;
    window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12;
    window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13;
    window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14;
    window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15;
    window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
    window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
    window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
    window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;

    // Notify owning PathSegList on any changes so they can be synchronized back to the path element.
    window.SVGPathSeg.prototype._segmentChanged = function() {
      if (this._owningPathSegList) this._owningPathSegList.segmentChanged(this);
    };

    window.SVGPathSegClosePath = function(owningPathSegList) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CLOSEPATH,
        'z',
        owningPathSegList
      );
    };
    window.SVGPathSegClosePath.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegClosePath.prototype.toString = function() {
      return '[object SVGPathSegClosePath]'
    };
    window.SVGPathSegClosePath.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter
    };
    window.SVGPathSegClosePath.prototype.clone = function() {
      return new window.SVGPathSegClosePath(undefined)
    };

    window.SVGPathSegMovetoAbs = function(owningPathSegList, x, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_MOVETO_ABS,
        'M',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegMovetoAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegMovetoAbs.prototype.toString = function() {
      return '[object SVGPathSegMovetoAbs]'
    };
    window.SVGPathSegMovetoAbs.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegMovetoAbs.prototype.clone = function() {
      return new window.SVGPathSegMovetoAbs(undefined, this._x, this._y)
    };
    Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegMovetoRel = function(owningPathSegList, x, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_MOVETO_REL,
        'm',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegMovetoRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegMovetoRel.prototype.toString = function() {
      return '[object SVGPathSegMovetoRel]'
    };
    window.SVGPathSegMovetoRel.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegMovetoRel.prototype.clone = function() {
      return new window.SVGPathSegMovetoRel(undefined, this._x, this._y)
    };
    Object.defineProperty(window.SVGPathSegMovetoRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegMovetoRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoAbs = function(owningPathSegList, x, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_ABS,
        'L',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegLinetoAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoAbs.prototype.toString = function() {
      return '[object SVGPathSegLinetoAbs]'
    };
    window.SVGPathSegLinetoAbs.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegLinetoAbs.prototype.clone = function() {
      return new window.SVGPathSegLinetoAbs(undefined, this._x, this._y)
    };
    Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoRel = function(owningPathSegList, x, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_REL,
        'l',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegLinetoRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoRel.prototype.toString = function() {
      return '[object SVGPathSegLinetoRel]'
    };
    window.SVGPathSegLinetoRel.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegLinetoRel.prototype.clone = function() {
      return new window.SVGPathSegLinetoRel(undefined, this._x, this._y)
    };
    Object.defineProperty(window.SVGPathSegLinetoRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegLinetoRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegCurvetoCubicAbs = function(
      owningPathSegList,
      x,
      y,
      x1,
      y1,
      x2,
      y2
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS,
        'C',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
      this._x2 = x2;
      this._y2 = y2;
    };
    window.SVGPathSegCurvetoCubicAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoCubicAbs.prototype.toString = function() {
      return '[object SVGPathSegCurvetoCubicAbs]'
    };
    window.SVGPathSegCurvetoCubicAbs.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x1 +
        ' ' +
        this._y1 +
        ' ' +
        this._x2 +
        ' ' +
        this._y2 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoCubicAbs.prototype.clone = function() {
      return new window.SVGPathSegCurvetoCubicAbs(
        undefined,
        this._x,
        this._y,
        this._x1,
        this._y1,
        this._x2,
        this._y2
      )
    };
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'x1', {
      get: function() {
        return this._x1
      },
      set: function(x1) {
        this._x1 = x1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'y1', {
      get: function() {
        return this._y1
      },
      set: function(y1) {
        this._y1 = y1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'x2', {
      get: function() {
        return this._x2
      },
      set: function(x2) {
        this._x2 = x2;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, 'y2', {
      get: function() {
        return this._y2
      },
      set: function(y2) {
        this._y2 = y2;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegCurvetoCubicRel = function(
      owningPathSegList,
      x,
      y,
      x1,
      y1,
      x2,
      y2
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL,
        'c',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
      this._x2 = x2;
      this._y2 = y2;
    };
    window.SVGPathSegCurvetoCubicRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoCubicRel.prototype.toString = function() {
      return '[object SVGPathSegCurvetoCubicRel]'
    };
    window.SVGPathSegCurvetoCubicRel.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x1 +
        ' ' +
        this._y1 +
        ' ' +
        this._x2 +
        ' ' +
        this._y2 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoCubicRel.prototype.clone = function() {
      return new window.SVGPathSegCurvetoCubicRel(
        undefined,
        this._x,
        this._y,
        this._x1,
        this._y1,
        this._x2,
        this._y2
      )
    };
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'x1', {
      get: function() {
        return this._x1
      },
      set: function(x1) {
        this._x1 = x1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'y1', {
      get: function() {
        return this._y1
      },
      set: function(y1) {
        this._y1 = y1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'x2', {
      get: function() {
        return this._x2
      },
      set: function(x2) {
        this._x2 = x2;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, 'y2', {
      get: function() {
        return this._y2
      },
      set: function(y2) {
        this._y2 = y2;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegCurvetoQuadraticAbs = function(
      owningPathSegList,
      x,
      y,
      x1,
      y1
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS,
        'Q',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
    };
    window.SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoQuadraticAbs.prototype.toString = function() {
      return '[object SVGPathSegCurvetoQuadraticAbs]'
    };
    window.SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x1 +
        ' ' +
        this._y1 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoQuadraticAbs.prototype.clone = function() {
      return new window.SVGPathSegCurvetoQuadraticAbs(
        undefined,
        this._x,
        this._y,
        this._x1,
        this._y1
      )
    };
    Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticAbs.prototype,
      'x1',
      {
        get: function() {
          return this._x1
        },
        set: function(x1) {
          this._x1 = x1;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticAbs.prototype,
      'y1',
      {
        get: function() {
          return this._y1
        },
        set: function(y1) {
          this._y1 = y1;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    window.SVGPathSegCurvetoQuadraticRel = function(
      owningPathSegList,
      x,
      y,
      x1,
      y1
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL,
        'q',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
    };
    window.SVGPathSegCurvetoQuadraticRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoQuadraticRel.prototype.toString = function() {
      return '[object SVGPathSegCurvetoQuadraticRel]'
    };
    window.SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x1 +
        ' ' +
        this._y1 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoQuadraticRel.prototype.clone = function() {
      return new window.SVGPathSegCurvetoQuadraticRel(
        undefined,
        this._x,
        this._y,
        this._x1,
        this._y1
      )
    };
    Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticRel.prototype,
      'x1',
      {
        get: function() {
          return this._x1
        },
        set: function(x1) {
          this._x1 = x1;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticRel.prototype,
      'y1',
      {
        get: function() {
          return this._y1
        },
        set: function(y1) {
          this._y1 = y1;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    window.SVGPathSegArcAbs = function(
      owningPathSegList,
      x,
      y,
      r1,
      r2,
      angle,
      largeArcFlag,
      sweepFlag
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_ARC_ABS,
        'A',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._r1 = r1;
      this._r2 = r2;
      this._angle = angle;
      this._largeArcFlag = largeArcFlag;
      this._sweepFlag = sweepFlag;
    };
    window.SVGPathSegArcAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegArcAbs.prototype.toString = function() {
      return '[object SVGPathSegArcAbs]'
    };
    window.SVGPathSegArcAbs.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._r1 +
        ' ' +
        this._r2 +
        ' ' +
        this._angle +
        ' ' +
        (this._largeArcFlag ? '1' : '0') +
        ' ' +
        (this._sweepFlag ? '1' : '0') +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegArcAbs.prototype.clone = function() {
      return new window.SVGPathSegArcAbs(
        undefined,
        this._x,
        this._y,
        this._r1,
        this._r2,
        this._angle,
        this._largeArcFlag,
        this._sweepFlag
      )
    };
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'r1', {
      get: function() {
        return this._r1
      },
      set: function(r1) {
        this._r1 = r1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'r2', {
      get: function() {
        return this._r2
      },
      set: function(r2) {
        this._r2 = r2;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'angle', {
      get: function() {
        return this._angle
      },
      set: function(angle) {
        this._angle = angle;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'largeArcFlag', {
      get: function() {
        return this._largeArcFlag
      },
      set: function(largeArcFlag) {
        this._largeArcFlag = largeArcFlag;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcAbs.prototype, 'sweepFlag', {
      get: function() {
        return this._sweepFlag
      },
      set: function(sweepFlag) {
        this._sweepFlag = sweepFlag;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegArcRel = function(
      owningPathSegList,
      x,
      y,
      r1,
      r2,
      angle,
      largeArcFlag,
      sweepFlag
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_ARC_REL,
        'a',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._r1 = r1;
      this._r2 = r2;
      this._angle = angle;
      this._largeArcFlag = largeArcFlag;
      this._sweepFlag = sweepFlag;
    };
    window.SVGPathSegArcRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegArcRel.prototype.toString = function() {
      return '[object SVGPathSegArcRel]'
    };
    window.SVGPathSegArcRel.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._r1 +
        ' ' +
        this._r2 +
        ' ' +
        this._angle +
        ' ' +
        (this._largeArcFlag ? '1' : '0') +
        ' ' +
        (this._sweepFlag ? '1' : '0') +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegArcRel.prototype.clone = function() {
      return new window.SVGPathSegArcRel(
        undefined,
        this._x,
        this._y,
        this._r1,
        this._r2,
        this._angle,
        this._largeArcFlag,
        this._sweepFlag
      )
    };
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'r1', {
      get: function() {
        return this._r1
      },
      set: function(r1) {
        this._r1 = r1;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'r2', {
      get: function() {
        return this._r2
      },
      set: function(r2) {
        this._r2 = r2;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'angle', {
      get: function() {
        return this._angle
      },
      set: function(angle) {
        this._angle = angle;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'largeArcFlag', {
      get: function() {
        return this._largeArcFlag
      },
      set: function(largeArcFlag) {
        this._largeArcFlag = largeArcFlag;
        this._segmentChanged();
      },
      enumerable: true
    });
    Object.defineProperty(window.SVGPathSegArcRel.prototype, 'sweepFlag', {
      get: function() {
        return this._sweepFlag
      },
      set: function(sweepFlag) {
        this._sweepFlag = sweepFlag;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoHorizontalAbs = function(owningPathSegList, x) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS,
        'H',
        owningPathSegList
      );
      this._x = x;
    };
    window.SVGPathSegLinetoHorizontalAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoHorizontalAbs.prototype.toString = function() {
      return '[object SVGPathSegLinetoHorizontalAbs]'
    };
    window.SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x
    };
    window.SVGPathSegLinetoHorizontalAbs.prototype.clone = function() {
      return new window.SVGPathSegLinetoHorizontalAbs(undefined, this._x)
    };
    Object.defineProperty(window.SVGPathSegLinetoHorizontalAbs.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoHorizontalRel = function(owningPathSegList, x) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL,
        'h',
        owningPathSegList
      );
      this._x = x;
    };
    window.SVGPathSegLinetoHorizontalRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoHorizontalRel.prototype.toString = function() {
      return '[object SVGPathSegLinetoHorizontalRel]'
    };
    window.SVGPathSegLinetoHorizontalRel.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x
    };
    window.SVGPathSegLinetoHorizontalRel.prototype.clone = function() {
      return new window.SVGPathSegLinetoHorizontalRel(undefined, this._x)
    };
    Object.defineProperty(window.SVGPathSegLinetoHorizontalRel.prototype, 'x', {
      get: function() {
        return this._x
      },
      set: function(x) {
        this._x = x;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoVerticalAbs = function(owningPathSegList, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS,
        'V',
        owningPathSegList
      );
      this._y = y;
    };
    window.SVGPathSegLinetoVerticalAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoVerticalAbs.prototype.toString = function() {
      return '[object SVGPathSegLinetoVerticalAbs]'
    };
    window.SVGPathSegLinetoVerticalAbs.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._y
    };
    window.SVGPathSegLinetoVerticalAbs.prototype.clone = function() {
      return new window.SVGPathSegLinetoVerticalAbs(undefined, this._y)
    };
    Object.defineProperty(window.SVGPathSegLinetoVerticalAbs.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegLinetoVerticalRel = function(owningPathSegList, y) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL,
        'v',
        owningPathSegList
      );
      this._y = y;
    };
    window.SVGPathSegLinetoVerticalRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegLinetoVerticalRel.prototype.toString = function() {
      return '[object SVGPathSegLinetoVerticalRel]'
    };
    window.SVGPathSegLinetoVerticalRel.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._y
    };
    window.SVGPathSegLinetoVerticalRel.prototype.clone = function() {
      return new window.SVGPathSegLinetoVerticalRel(undefined, this._y)
    };
    Object.defineProperty(window.SVGPathSegLinetoVerticalRel.prototype, 'y', {
      get: function() {
        return this._y
      },
      set: function(y) {
        this._y = y;
        this._segmentChanged();
      },
      enumerable: true
    });

    window.SVGPathSegCurvetoCubicSmoothAbs = function(
      owningPathSegList,
      x,
      y,
      x2,
      y2
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS,
        'S',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x2 = x2;
      this._y2 = y2;
    };
    window.SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function() {
      return '[object SVGPathSegCurvetoCubicSmoothAbs]'
    };
    window.SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x2 +
        ' ' +
        this._y2 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function() {
      return new window.SVGPathSegCurvetoCubicSmoothAbs(
        undefined,
        this._x,
        this._y,
        this._x2,
        this._y2
      )
    };
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothAbs.prototype,
      'x',
      {
        get: function() {
          return this._x
        },
        set: function(x) {
          this._x = x;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothAbs.prototype,
      'y',
      {
        get: function() {
          return this._y
        },
        set: function(y) {
          this._y = y;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothAbs.prototype,
      'x2',
      {
        get: function() {
          return this._x2
        },
        set: function(x2) {
          this._x2 = x2;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothAbs.prototype,
      'y2',
      {
        get: function() {
          return this._y2
        },
        set: function(y2) {
          this._y2 = y2;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    window.SVGPathSegCurvetoCubicSmoothRel = function(
      owningPathSegList,
      x,
      y,
      x2,
      y2
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL,
        's',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
      this._x2 = x2;
      this._y2 = y2;
    };
    window.SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function() {
      return '[object SVGPathSegCurvetoCubicSmoothRel]'
    };
    window.SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function() {
      return (
        this.pathSegTypeAsLetter +
        ' ' +
        this._x2 +
        ' ' +
        this._y2 +
        ' ' +
        this._x +
        ' ' +
        this._y
      )
    };
    window.SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function() {
      return new window.SVGPathSegCurvetoCubicSmoothRel(
        undefined,
        this._x,
        this._y,
        this._x2,
        this._y2
      )
    };
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothRel.prototype,
      'x',
      {
        get: function() {
          return this._x
        },
        set: function(x) {
          this._x = x;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothRel.prototype,
      'y',
      {
        get: function() {
          return this._y
        },
        set: function(y) {
          this._y = y;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothRel.prototype,
      'x2',
      {
        get: function() {
          return this._x2
        },
        set: function(x2) {
          this._x2 = x2;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoCubicSmoothRel.prototype,
      'y2',
      {
        get: function() {
          return this._y2
        },
        set: function(y2) {
          this._y2 = y2;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    window.SVGPathSegCurvetoQuadraticSmoothAbs = function(
      owningPathSegList,
      x,
      y
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS,
        'T',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function() {
      return '[object SVGPathSegCurvetoQuadraticSmoothAbs]'
    };
    window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function() {
      return new window.SVGPathSegCurvetoQuadraticSmoothAbs(
        undefined,
        this._x,
        this._y
      )
    };
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype,
      'x',
      {
        get: function() {
          return this._x
        },
        set: function(x) {
          this._x = x;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype,
      'y',
      {
        get: function() {
          return this._y
        },
        set: function(y) {
          this._y = y;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    window.SVGPathSegCurvetoQuadraticSmoothRel = function(
      owningPathSegList,
      x,
      y
    ) {
      window.SVGPathSeg.call(
        this,
        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL,
        't',
        owningPathSegList
      );
      this._x = x;
      this._y = y;
    };
    window.SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(
      window.SVGPathSeg.prototype
    );
    window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function() {
      return '[object SVGPathSegCurvetoQuadraticSmoothRel]'
    };
    window.SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function() {
      return this.pathSegTypeAsLetter + ' ' + this._x + ' ' + this._y
    };
    window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function() {
      return new window.SVGPathSegCurvetoQuadraticSmoothRel(
        undefined,
        this._x,
        this._y
      )
    };
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype,
      'x',
      {
        get: function() {
          return this._x
        },
        set: function(x) {
          this._x = x;
          this._segmentChanged();
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype,
      'y',
      {
        get: function() {
          return this._y
        },
        set: function(y) {
          this._y = y;
          this._segmentChanged();
        },
        enumerable: true
      }
    );

    // Add createSVGPathSeg* functions to window.SVGPathElement.
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-Interfacewindow.SVGPathElement.
    window.SVGPathElement.prototype.createSVGPathSegClosePath = function() {
      return new window.SVGPathSegClosePath(undefined)
    };
    window.SVGPathElement.prototype.createSVGPathSegMovetoAbs = function(x, y) {
      return new window.SVGPathSegMovetoAbs(undefined, x, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegMovetoRel = function(x, y) {
      return new window.SVGPathSegMovetoRel(undefined, x, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoAbs = function(x, y) {
      return new window.SVGPathSegLinetoAbs(undefined, x, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoRel = function(x, y) {
      return new window.SVGPathSegLinetoRel(undefined, x, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function(
      x,
      y,
      x1,
      y1,
      x2,
      y2
    ) {
      return new window.SVGPathSegCurvetoCubicAbs(
        undefined,
        x,
        y,
        x1,
        y1,
        x2,
        y2
      )
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function(
      x,
      y,
      x1,
      y1,
      x2,
      y2
    ) {
      return new window.SVGPathSegCurvetoCubicRel(
        undefined,
        x,
        y,
        x1,
        y1,
        x2,
        y2
      )
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function(
      x,
      y,
      x1,
      y1
    ) {
      return new window.SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function(
      x,
      y,
      x1,
      y1
    ) {
      return new window.SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1)
    };
    window.SVGPathElement.prototype.createSVGPathSegArcAbs = function(
      x,
      y,
      r1,
      r2,
      angle,
      largeArcFlag,
      sweepFlag
    ) {
      return new window.SVGPathSegArcAbs(
        undefined,
        x,
        y,
        r1,
        r2,
        angle,
        largeArcFlag,
        sweepFlag
      )
    };
    window.SVGPathElement.prototype.createSVGPathSegArcRel = function(
      x,
      y,
      r1,
      r2,
      angle,
      largeArcFlag,
      sweepFlag
    ) {
      return new window.SVGPathSegArcRel(
        undefined,
        x,
        y,
        r1,
        r2,
        angle,
        largeArcFlag,
        sweepFlag
      )
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function(
      x
    ) {
      return new window.SVGPathSegLinetoHorizontalAbs(undefined, x)
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function(
      x
    ) {
      return new window.SVGPathSegLinetoHorizontalRel(undefined, x)
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function(
      y
    ) {
      return new window.SVGPathSegLinetoVerticalAbs(undefined, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function(
      y
    ) {
      return new window.SVGPathSegLinetoVerticalRel(undefined, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function(
      x,
      y,
      x2,
      y2
    ) {
      return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function(
      x,
      y,
      x2,
      y2
    ) {
      return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function(
      x,
      y
    ) {
      return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y)
    };
    window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function(
      x,
      y
    ) {
      return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y)
    };

    if (!('getPathSegAtLength' in window.SVGPathElement.prototype)) {
      // Add getPathSegAtLength to SVGPathElement.
      // Spec: https://www.w3.org/TR/SVG11/single-page.html#paths-__svg__SVGPathElement__getPathSegAtLength
      // This polyfill requires SVGPathElement.getTotalLength to implement the distance-along-a-path algorithm.
      window.SVGPathElement.prototype.getPathSegAtLength = function(distance) {
        if (distance === undefined || !isFinite(distance))
          throw 'Invalid arguments.'

        var measurementElement = document.createElementNS(
          'http://www.w3.org/2000/svg',
          'path'
        );
        measurementElement.setAttribute('d', this.getAttribute('d'));
        var lastPathSegment = measurementElement.pathSegList.numberOfItems - 1;

        // If the path is empty, return 0.
        if (lastPathSegment <= 0) return 0

        do {
          measurementElement.pathSegList.removeItem(lastPathSegment);
          if (distance > measurementElement.getTotalLength()) break
          lastPathSegment--;
        } while (lastPathSegment > 0)
        return lastPathSegment
      };
    }
  }

  if (!('SVGPathSegList' in window)) {
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList
    window.SVGPathSegList = function(pathElement) {
      this._pathElement = pathElement;
      this._list = this._parsePath(this._pathElement.getAttribute('d'));

      // Use a MutationObserver to catch changes to the path's "d" attribute.
      this._mutationObserverConfig = {
        attributes: true,
        attributeFilter: ['d']
      };
      this._pathElementMutationObserver = new MutationObserver(
        this._updateListFromPathMutations.bind(this)
      );
      this._pathElementMutationObserver.observe(
        this._pathElement,
        this._mutationObserverConfig
      );
    };

    window.SVGPathSegList.prototype.classname = 'SVGPathSegList';

    Object.defineProperty(window.SVGPathSegList.prototype, 'numberOfItems', {
      get: function() {
        this._checkPathSynchronizedToList();
        return this._list.length
      },
      enumerable: true
    });

    // Add the pathSegList accessors to window.SVGPathElement.
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData
    Object.defineProperty(window.SVGPathElement.prototype, 'pathSegList', {
      get: function() {
        if (!this._pathSegList)
          this._pathSegList = new window.SVGPathSegList(this);
        return this._pathSegList
      },
      enumerable: true
    });
    // FIXME: The following are not implemented and simply return window.SVGPathElement.pathSegList.
    Object.defineProperty(
      window.SVGPathElement.prototype,
      'normalizedPathSegList',
      {
        get: function() {
          return this.pathSegList
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathElement.prototype,
      'animatedPathSegList',
      {
        get: function() {
          return this.pathSegList
        },
        enumerable: true
      }
    );
    Object.defineProperty(
      window.SVGPathElement.prototype,
      'animatedNormalizedPathSegList',
      {
        get: function() {
          return this.pathSegList
        },
        enumerable: true
      }
    );

    // Process any pending mutations to the path element and update the list as needed.
    // This should be the first call of all public functions and is needed because
    // MutationObservers are not synchronous so we can have pending asynchronous mutations.
    window.SVGPathSegList.prototype._checkPathSynchronizedToList = function() {
      this._updateListFromPathMutations(
        this._pathElementMutationObserver.takeRecords()
      );
    };

    window.SVGPathSegList.prototype._updateListFromPathMutations = function(
      mutationRecords
    ) {
      if (!this._pathElement) return
      var hasPathMutations = false;
      mutationRecords.forEach(function(record) {
        if (record.attributeName == 'd') hasPathMutations = true;
      });
      if (hasPathMutations)
        this._list = this._parsePath(this._pathElement.getAttribute('d'));
    };

    // Serialize the list and update the path's 'd' attribute.
    window.SVGPathSegList.prototype._writeListToPath = function() {
      this._pathElementMutationObserver.disconnect();
      this._pathElement.setAttribute(
        'd',
        window.SVGPathSegList._pathSegArrayAsString(this._list)
      );
      this._pathElementMutationObserver.observe(
        this._pathElement,
        this._mutationObserverConfig
      );
    };

    // When a path segment changes the list needs to be synchronized back to the path element.
    window.SVGPathSegList.prototype.segmentChanged = function(pathSeg) {
      this._writeListToPath();
    };

    window.SVGPathSegList.prototype.clear = function() {
      this._checkPathSynchronizedToList();

      this._list.forEach(function(pathSeg) {
        pathSeg._owningPathSegList = null;
      });
      this._list = [];
      this._writeListToPath();
    };

    window.SVGPathSegList.prototype.initialize = function(newItem) {
      this._checkPathSynchronizedToList();

      this._list = [newItem];
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem
    };

    window.SVGPathSegList.prototype._checkValidIndex = function(index) {
      if (isNaN(index) || index < 0 || index >= this.numberOfItems)
        throw 'INDEX_SIZE_ERR'
    };

    window.SVGPathSegList.prototype.getItem = function(index) {
      this._checkPathSynchronizedToList();

      this._checkValidIndex(index);
      return this._list[index]
    };

    window.SVGPathSegList.prototype.insertItemBefore = function(
      newItem,
      index
    ) {
      this._checkPathSynchronizedToList();

      // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.
      if (index > this.numberOfItems) index = this.numberOfItems;
      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._list.splice(index, 0, newItem);
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem
    };

    window.SVGPathSegList.prototype.replaceItem = function(newItem, index) {
      this._checkPathSynchronizedToList();

      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._checkValidIndex(index);
      this._list[index] = newItem;
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem
    };

    window.SVGPathSegList.prototype.removeItem = function(index) {
      this._checkPathSynchronizedToList();

      this._checkValidIndex(index);
      var item = this._list[index];
      this._list.splice(index, 1);
      this._writeListToPath();
      return item
    };

    window.SVGPathSegList.prototype.appendItem = function(newItem) {
      this._checkPathSynchronizedToList();

      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._list.push(newItem);
      newItem._owningPathSegList = this;
      // TODO: Optimize this to just append to the existing attribute.
      this._writeListToPath();
      return newItem
    };

    window.SVGPathSegList._pathSegArrayAsString = function(pathSegArray) {
      var string = '';
      var first = true;
      pathSegArray.forEach(function(pathSeg) {
        if (first) {
          first = false;
          string += pathSeg._asPathString();
        } else {
          string += ' ' + pathSeg._asPathString();
        }
      });
      return string
    };

    // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.
    window.SVGPathSegList.prototype._parsePath = function(string) {
      if (!string || string.length == 0) return []

      var owningPathSegList = this;

      var Builder = function() {
        this.pathSegList = [];
      };

      Builder.prototype.appendSegment = function(pathSeg) {
        this.pathSegList.push(pathSeg);
      };

      var Source = function(string) {
        this._string = string;
        this._currentIndex = 0;
        this._endIndex = this._string.length;
        this._previousCommand = window.SVGPathSeg.PATHSEG_UNKNOWN;

        this._skipOptionalSpaces();
      };

      Source.prototype._isCurrentSpace = function() {
        var character = this._string[this._currentIndex];
        return (
          character <= ' ' &&
          (character == ' ' ||
            character == '\n' ||
            character == '\t' ||
            character == '\r' ||
            character == '\f')
        )
      };

      Source.prototype._skipOptionalSpaces = function() {
        while (this._currentIndex < this._endIndex && this._isCurrentSpace())
          this._currentIndex++;
        return this._currentIndex < this._endIndex
      };

      Source.prototype._skipOptionalSpacesOrDelimiter = function() {
        if (
          this._currentIndex < this._endIndex &&
          !this._isCurrentSpace() &&
          this._string.charAt(this._currentIndex) != ','
        )
          return false
        if (this._skipOptionalSpaces()) {
          if (
            this._currentIndex < this._endIndex &&
            this._string.charAt(this._currentIndex) == ','
          ) {
            this._currentIndex++;
            this._skipOptionalSpaces();
          }
        }
        return this._currentIndex < this._endIndex
      };

      Source.prototype.hasMoreData = function() {
        return this._currentIndex < this._endIndex
      };

      Source.prototype.peekSegmentType = function() {
        var lookahead = this._string[this._currentIndex];
        return this._pathSegTypeFromChar(lookahead)
      };

      Source.prototype._pathSegTypeFromChar = function(lookahead) {
        switch (lookahead) {
          case 'Z':
          case 'z':
            return window.SVGPathSeg.PATHSEG_CLOSEPATH
          case 'M':
            return window.SVGPathSeg.PATHSEG_MOVETO_ABS
          case 'm':
            return window.SVGPathSeg.PATHSEG_MOVETO_REL
          case 'L':
            return window.SVGPathSeg.PATHSEG_LINETO_ABS
          case 'l':
            return window.SVGPathSeg.PATHSEG_LINETO_REL
          case 'C':
            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS
          case 'c':
            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL
          case 'Q':
            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS
          case 'q':
            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL
          case 'A':
            return window.SVGPathSeg.PATHSEG_ARC_ABS
          case 'a':
            return window.SVGPathSeg.PATHSEG_ARC_REL
          case 'H':
            return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS
          case 'h':
            return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL
          case 'V':
            return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS
          case 'v':
            return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL
          case 'S':
            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS
          case 's':
            return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL
          case 'T':
            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS
          case 't':
            return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL
          default:
            return window.SVGPathSeg.PATHSEG_UNKNOWN
        }
      };

      Source.prototype._nextCommandHelper = function(
        lookahead,
        previousCommand
      ) {
        // Check for remaining coordinates in the current command.
        if (
          (lookahead == '+' ||
            lookahead == '-' ||
            lookahead == '.' ||
            (lookahead >= '0' && lookahead <= '9')) &&
          previousCommand != window.SVGPathSeg.PATHSEG_CLOSEPATH
        ) {
          if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_ABS)
            return window.SVGPathSeg.PATHSEG_LINETO_ABS
          if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_REL)
            return window.SVGPathSeg.PATHSEG_LINETO_REL
          return previousCommand
        }
        return window.SVGPathSeg.PATHSEG_UNKNOWN
      };

      Source.prototype.initialCommandIsMoveTo = function() {
        // If the path is empty it is still valid, so return true.
        if (!this.hasMoreData()) return true
        var command = this.peekSegmentType();
        // Path must start with moveTo.
        return (
          command == window.SVGPathSeg.PATHSEG_MOVETO_ABS ||
          command == window.SVGPathSeg.PATHSEG_MOVETO_REL
        )
      };

      // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF
      Source.prototype._parseNumber = function() {
        var exponent = 0;
        var integer = 0;
        var frac = 1;
        var decimal = 0;
        var sign = 1;
        var expsign = 1;

        var startIndex = this._currentIndex;

        this._skipOptionalSpaces();

        // Read the sign.
        if (
          this._currentIndex < this._endIndex &&
          this._string.charAt(this._currentIndex) == '+'
        )
          this._currentIndex++;
        else if (
          this._currentIndex < this._endIndex &&
          this._string.charAt(this._currentIndex) == '-'
        ) {
          this._currentIndex++;
          sign = -1;
        }

        if (
          this._currentIndex == this._endIndex ||
          ((this._string.charAt(this._currentIndex) < '0' ||
            this._string.charAt(this._currentIndex) > '9') &&
            this._string.charAt(this._currentIndex) != '.')
        )
          // The first character of a number must be one of [0-9+-.].
          return undefined

        // Read the integer part, build right-to-left.
        var startIntPartIndex = this._currentIndex;
        while (
          this._currentIndex < this._endIndex &&
          this._string.charAt(this._currentIndex) >= '0' &&
          this._string.charAt(this._currentIndex) <= '9'
        )
          this._currentIndex++; // Advance to first non-digit.

        if (this._currentIndex != startIntPartIndex) {
          var scanIntPartIndex = this._currentIndex - 1;
          var multiplier = 1;
          while (scanIntPartIndex >= startIntPartIndex) {
            integer +=
              multiplier * (this._string.charAt(scanIntPartIndex--) - '0');
            multiplier *= 10;
          }
        }

        // Read the decimals.
        if (
          this._currentIndex < this._endIndex &&
          this._string.charAt(this._currentIndex) == '.'
        ) {
          this._currentIndex++;

          // There must be a least one digit following the .
          if (
            this._currentIndex >= this._endIndex ||
            this._string.charAt(this._currentIndex) < '0' ||
            this._string.charAt(this._currentIndex) > '9'
          )
            return undefined
          while (
            this._currentIndex < this._endIndex &&
            this._string.charAt(this._currentIndex) >= '0' &&
            this._string.charAt(this._currentIndex) <= '9'
          ) {
            frac *= 10;
            decimal += (this._string.charAt(this._currentIndex) - '0') / frac;
            this._currentIndex += 1;
          }
        }

        // Read the exponent part.
        if (
          this._currentIndex != startIndex &&
          this._currentIndex + 1 < this._endIndex &&
          (this._string.charAt(this._currentIndex) == 'e' ||
            this._string.charAt(this._currentIndex) == 'E') &&
          this._string.charAt(this._currentIndex + 1) != 'x' &&
          this._string.charAt(this._currentIndex + 1) != 'm'
        ) {
          this._currentIndex++;

          // Read the sign of the exponent.
          if (this._string.charAt(this._currentIndex) == '+') {
            this._currentIndex++;
          } else if (this._string.charAt(this._currentIndex) == '-') {
            this._currentIndex++;
            expsign = -1;
          }

          // There must be an exponent.
          if (
            this._currentIndex >= this._endIndex ||
            this._string.charAt(this._currentIndex) < '0' ||
            this._string.charAt(this._currentIndex) > '9'
          )
            return undefined

          while (
            this._currentIndex < this._endIndex &&
            this._string.charAt(this._currentIndex) >= '0' &&
            this._string.charAt(this._currentIndex) <= '9'
          ) {
            exponent *= 10;
            exponent += this._string.charAt(this._currentIndex) - '0';
            this._currentIndex++;
          }
        }

        var number = integer + decimal;
        number *= sign;

        if (exponent) number *= Math.pow(10, expsign * exponent);

        if (startIndex == this._currentIndex) return undefined

        this._skipOptionalSpacesOrDelimiter();

        return number
      };

      Source.prototype._parseArcFlag = function() {
        if (this._currentIndex >= this._endIndex) return undefined
        var flag = false;
        var flagChar = this._string.charAt(this._currentIndex++);
        if (flagChar == '0') flag = false;
        else if (flagChar == '1') flag = true;
        else return undefined

        this._skipOptionalSpacesOrDelimiter();
        return flag
      };

      Source.prototype.parseSegment = function() {
        var lookahead = this._string[this._currentIndex];
        var command = this._pathSegTypeFromChar(lookahead);
        if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) {
          // Possibly an implicit command. Not allowed if this is the first command.
          if (this._previousCommand == window.SVGPathSeg.PATHSEG_UNKNOWN)
            return null
          command = this._nextCommandHelper(lookahead, this._previousCommand);
          if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) return null
        } else {
          this._currentIndex++;
        }

        this._previousCommand = command;

        switch (command) {
          case window.SVGPathSeg.PATHSEG_MOVETO_REL:
            return new window.SVGPathSegMovetoRel(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_MOVETO_ABS:
            return new window.SVGPathSegMovetoAbs(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_REL:
            return new window.SVGPathSegLinetoRel(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_ABS:
            return new window.SVGPathSegLinetoAbs(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:
            return new window.SVGPathSegLinetoHorizontalRel(
              owningPathSegList,
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:
            return new window.SVGPathSegLinetoHorizontalAbs(
              owningPathSegList,
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:
            return new window.SVGPathSegLinetoVerticalRel(
              owningPathSegList,
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:
            return new window.SVGPathSegLinetoVerticalAbs(
              owningPathSegList,
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_CLOSEPATH:
            this._skipOptionalSpaces();
            return new window.SVGPathSegClosePath(owningPathSegList)
          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              x2: this._parseNumber(),
              y2: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoCubicRel(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1,
              points.x2,
              points.y2
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              x2: this._parseNumber(),
              y2: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoCubicAbs(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1,
              points.x2,
              points.y2
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
            var points = {
              x2: this._parseNumber(),
              y2: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoCubicSmoothRel(
              owningPathSegList,
              points.x,
              points.y,
              points.x2,
              points.y2
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
            var points = {
              x2: this._parseNumber(),
              y2: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoCubicSmoothAbs(
              owningPathSegList,
              points.x,
              points.y,
              points.x2,
              points.y2
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoQuadraticRel(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegCurvetoQuadraticAbs(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
            return new window.SVGPathSegCurvetoQuadraticSmoothRel(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
            return new window.SVGPathSegCurvetoQuadraticSmoothAbs(
              owningPathSegList,
              this._parseNumber(),
              this._parseNumber()
            )
          case window.SVGPathSeg.PATHSEG_ARC_REL:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              arcAngle: this._parseNumber(),
              arcLarge: this._parseArcFlag(),
              arcSweep: this._parseArcFlag(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegArcRel(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1,
              points.arcAngle,
              points.arcLarge,
              points.arcSweep
            )
          case window.SVGPathSeg.PATHSEG_ARC_ABS:
            var points = {
              x1: this._parseNumber(),
              y1: this._parseNumber(),
              arcAngle: this._parseNumber(),
              arcLarge: this._parseArcFlag(),
              arcSweep: this._parseArcFlag(),
              x: this._parseNumber(),
              y: this._parseNumber()
            };
            return new window.SVGPathSegArcAbs(
              owningPathSegList,
              points.x,
              points.y,
              points.x1,
              points.y1,
              points.arcAngle,
              points.arcLarge,
              points.arcSweep
            )
          default:
            throw 'Unknown path seg type.'
        }
      };

      var builder = new Builder();
      var source = new Source(string);

      if (!source.initialCommandIsMoveTo()) return []
      while (source.hasMoreData()) {
        var pathSeg = source.parseSegment();
        if (!pathSeg) return []
        builder.appendSegment(pathSeg);
      }

      return builder.pathSegList
    };
  }
})();

// String.padEnd polyfill for IE11
//
// https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd
if (!String.prototype.padEnd) {
  String.prototype.padEnd = function padEnd(targetLength, padString) {
    targetLength = targetLength >> 0; //floor if number or convert non-number to 0;
    padString = String(typeof padString !== 'undefined' ? padString : ' ');
    if (this.length > targetLength) {
      return String(this)
    } else {
      targetLength = targetLength - this.length;
      if (targetLength > padString.length) {
        padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
      }
      return String(this) + padString.slice(0, targetLength)
    }
  };
}

// Object.assign polyfill for IE11
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill
if (typeof Object.assign !== 'function') {
  // Must be writable: true, enumerable: false, configurable: true
  Object.defineProperty(Object, 'assign', {
    value: function assign(target, varArgs) {
      if (target === null || target === undefined) {
        throw new TypeError('Cannot convert undefined or null to object')
      }

      var to = Object(target);

      for (var index = 1; index < arguments.length; index++) {
        var nextSource = arguments[index];

        if (nextSource !== null && nextSource !== undefined) {
          for (var nextKey in nextSource) {
            // Avoid bugs when hasOwnProperty is shadowed
            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
              to[nextKey] = nextSource[nextKey];
            }
          }
        }
      }
      return to
    },
    writable: true,
    configurable: true
  });
}

/* jshint ignore:end */

Chart.prototype.axis = function() {};
Chart.prototype.axis.labels = function(labels) {
  var $$ = this.internal;
  if (arguments.length) {
    Object.keys(labels).forEach(function(axisId) {
      $$.axis.setLabelText(axisId, labels[axisId]);
    });
    $$.axis.updateLabels();
  }
  // TODO: return some values?
};
Chart.prototype.axis.max = function(max) {
  var $$ = this.internal,
    config = $$.config;
  if (arguments.length) {
    if (typeof max === 'object') {
      if (isValue(max.x)) {
        config.axis_x_max = max.x;
      }
      if (isValue(max.y)) {
        config.axis_y_max = max.y;
      }
      if (isValue(max.y2)) {
        config.axis_y2_max = max.y2;
      }
    } else {
      config.axis_y_max = config.axis_y2_max = max;
    }
    $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
  } else {
    return {
      x: config.axis_x_max,
      y: config.axis_y_max,
      y2: config.axis_y2_max
    }
  }
};
Chart.prototype.axis.min = function(min) {
  var $$ = this.internal,
    config = $$.config;
  if (arguments.length) {
    if (typeof min === 'object') {
      if (isValue(min.x)) {
        config.axis_x_min = min.x;
      }
      if (isValue(min.y)) {
        config.axis_y_min = min.y;
      }
      if (isValue(min.y2)) {
        config.axis_y2_min = min.y2;
      }
    } else {
      config.axis_y_min = config.axis_y2_min = min;
    }
    $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
  } else {
    return {
      x: config.axis_x_min,
      y: config.axis_y_min,
      y2: config.axis_y2_min
    }
  }
};
Chart.prototype.axis.range = function(range) {
  if (arguments.length) {
    if (isDefined(range.max)) {
      this.axis.max(range.max);
    }
    if (isDefined(range.min)) {
      this.axis.min(range.min);
    }
  } else {
    return {
      max: this.axis.max(),
      min: this.axis.min()
    }
  }
};

Chart.prototype.axis.types = function(types) {
  const $$ = this.internal;
  if (types === undefined) {
    return {
      y: $$.config.axis_y_type,
      y2: $$.config.axis_y2_type
    }
  } else {
    if (isDefined(types.y)) {
      $$.config.axis_y_type = types.y;
    }

    if (isDefined(types.y2)) {
      $$.config.axis_y2_type = types.y2;
    }

    $$.updateScales();
    $$.redraw();
  }
};

Chart.prototype.category = function(i, category) {
  var $$ = this.internal,
    config = $$.config;
  if (arguments.length > 1) {
    config.axis_x_categories[i] = category;
    $$.redraw();
  }
  return config.axis_x_categories[i]
};
Chart.prototype.categories = function(categories) {
  var $$ = this.internal,
    config = $$.config;
  if (!arguments.length) {
    return config.axis_x_categories
  }
  config.axis_x_categories = categories;
  $$.redraw();
  return config.axis_x_categories
};

Chart.prototype.resize = function(size) {
  var $$ = this.internal,
    config = $$.config;
  config.size_width = size ? size.width : null;
  config.size_height = size ? size.height : null;
  this.flush();
};

Chart.prototype.flush = function() {
  var $$ = this.internal;
  $$.updateAndRedraw({
    withLegend: true,
    withTransition: false,
    withTransitionForTransform: false
  });
};

Chart.prototype.destroy = function() {
  var $$ = this.internal;

  window.clearInterval($$.intervalForObserveInserted);

  if ($$.resizeTimeout !== undefined) {
    window.clearTimeout($$.resizeTimeout);
  }

  if (window.detachEvent) {
    window.detachEvent('onresize', $$.resizeIfElementDisplayed);
  } else if (window.removeEventListener) {
    window.removeEventListener('resize', $$.resizeIfElementDisplayed);
  } else {
    var wrapper = window.onresize;
    // check if no one else removed our wrapper and remove our resizeFunction from it
    if (wrapper && wrapper.add && wrapper.remove) {
      wrapper.remove($$.resizeFunction);
    }
  }

  // Removes the inner resize functions
  $$.resizeFunction.remove();

  // Unbinds from the window focus event
  $$.unbindWindowFocus();

  $$.selectChart.classed('c3', false).html('');

  // MEMO: this is needed because the reference of some elements will not be released, then memory leak will happen.
  Object.keys($$).forEach(function(key) {
    $$[key] = null;
  });

  return null
};

// TODO: fix
Chart.prototype.color = function(id) {
  var $$ = this.internal;
  return $$.color(id) // more patterns
};

Chart.prototype.data = function(targetIds) {
  var targets = this.internal.data.targets;
  return typeof targetIds === 'undefined'
    ? targets
    : targets.filter(function(t) {
        return [].concat(targetIds).indexOf(t.id) >= 0
      })
};
Chart.prototype.data.shown = function(targetIds) {
  return this.internal.filterTargetsToShow(this.data(targetIds))
};

/**
 * Get values of the data loaded in the chart.
 *
 * @param {String|Array} targetId This API returns the value of specified target.
 * @param flat
 * @return {Array} Data values
 */
Chart.prototype.data.values = function(targetId, flat = true) {
  let values = null;

  if (targetId) {
    const targets = this.data(targetId);
    if (targets && isArray(targets)) {
      values = targets.reduce((ret, v) => {
        const dataValue = v.values.map(d => d.value);
        if (flat) {
          ret = ret.concat(dataValue);
        } else {
          ret.push(dataValue);
        }
        return ret
      }, []);
    }
  }

  return values
};
Chart.prototype.data.names = function(names) {
  this.internal.clearLegendItemTextBoxCache();
  return this.internal.updateDataAttributes('names', names)
};
Chart.prototype.data.colors = function(colors) {
  return this.internal.updateDataAttributes('colors', colors)
};
Chart.prototype.data.axes = function(axes) {
  return this.internal.updateDataAttributes('axes', axes)
};

Chart.prototype.data.stackNormalized = function(normalized) {
  if (normalized === undefined) {
    return this.internal.isStackNormalized()
  }

  this.internal.config.data_stack_normalize = !!normalized;
  this.internal.redraw();
};

Chart.prototype.donut = function() {};

Chart.prototype.donut.padAngle = function(padAngle) {
  if (padAngle === undefined) {
    return this.internal.config.donut_padAngle
  }
  this.internal.config.donut_padAngle = padAngle;
  this.flush();
};

Chart.prototype.flow = function(args) {
  var $$ = this.internal,
    targets,
    data,
    notfoundIds = [],
    orgDataCount = $$.getMaxDataCount(),
    dataCount,
    domain,
    baseTarget,
    baseValue,
    length = 0,
    tail = 0,
    diff,
    to;

  if (args.json) {
    data = $$.convertJsonToData(args.json, args.keys);
  } else if (args.rows) {
    data = $$.convertRowsToData(args.rows);
  } else if (args.columns) {
    data = $$.convertColumnsToData(args.columns);
  } else {
    return
  }
  targets = $$.convertDataToTargets(data, true);

  // Update/Add data
  $$.data.targets.forEach(function(t) {
    var found = false,
      i,
      j;
    for (i = 0; i < targets.length; i++) {
      if (t.id === targets[i].id) {
        found = true;

        if (t.values[t.values.length - 1]) {
          tail = t.values[t.values.length - 1].index + 1;
        }
        length = targets[i].values.length;

        for (j = 0; j < length; j++) {
          targets[i].values[j].index = tail + j;
          if (!$$.isTimeSeries()) {
            targets[i].values[j].x = tail + j;
          }
        }
        t.values = t.values.concat(targets[i].values);

        targets.splice(i, 1);
        break
      }
    }
    if (!found) {
      notfoundIds.push(t.id);
    }
  });

  // Append null for not found targets
  $$.data.targets.forEach(function(t) {
    var i, j;
    for (i = 0; i < notfoundIds.length; i++) {
      if (t.id === notfoundIds[i]) {
        tail = t.values[t.values.length - 1].index + 1;
        for (j = 0; j < length; j++) {
          t.values.push({
            id: t.id,
            index: tail + j,
            x: $$.isTimeSeries() ? $$.getOtherTargetX(tail + j) : tail + j,
            value: null
          });
        }
      }
    }
  });

  // Generate null values for new target
  if ($$.data.targets.length) {
    targets.forEach(function(t) {
      var i,
        missing = [];
      for (i = $$.data.targets[0].values[0].index; i < tail; i++) {
        missing.push({
          id: t.id,
          index: i,
          x: $$.isTimeSeries() ? $$.getOtherTargetX(i) : i,
          value: null
        });
      }
      t.values.forEach(function(v) {
        v.index += tail;
        if (!$$.isTimeSeries()) {
          v.x += tail;
        }
      });
      t.values = missing.concat(t.values);
    });
  }
  $$.data.targets = $$.data.targets.concat(targets); // add remained

  // check data count because behavior needs to change when it's only one
  dataCount = $$.getMaxDataCount();
  baseTarget = $$.data.targets[0];
  baseValue = baseTarget.values[0];

  // Update length to flow if needed
  if (isDefined(args.to)) {
    length = 0;
    to = $$.isTimeSeries() ? $$.parseDate(args.to) : args.to;
    baseTarget.values.forEach(function(v) {
      if (v.x < to) {
        length++;
      }
    });
  } else if (isDefined(args.length)) {
    length = args.length;
  }

  // If only one data, update the domain to flow from left edge of the chart
  if (!orgDataCount) {
    if ($$.isTimeSeries()) {
      if (baseTarget.values.length > 1) {
        diff = baseTarget.values[baseTarget.values.length - 1].x - baseValue.x;
      } else {
        diff = baseValue.x - $$.getXDomain($$.data.targets)[0];
      }
    } else {
      diff = 1;
    }
    domain = [baseValue.x - diff, baseValue.x];
    $$.updateXDomain(null, true, true, false, domain);
  } else if (orgDataCount === 1) {
    if ($$.isTimeSeries()) {
      diff =
        (baseTarget.values[baseTarget.values.length - 1].x - baseValue.x) / 2;
      domain = [new Date(+baseValue.x - diff), new Date(+baseValue.x + diff)];
      $$.updateXDomain(null, true, true, false, domain);
    }
  }

  // Set targets
  $$.updateTargets($$.data.targets);

  // Redraw with new targets
  $$.redraw({
    flow: {
      index: baseValue.index,
      length: length,
      duration: isValue(args.duration)
        ? args.duration
        : $$.config.transition_duration,
      done: args.done,
      orgDataCount: orgDataCount
    },
    withLegend: true,
    withTransition: orgDataCount > 1,
    withTrimXDomain: false,
    withUpdateXAxis: true
  });
};

ChartInternal.prototype.generateFlow = function(args) {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3;

  return function() {
    var targets = args.targets,
      flow = args.flow,
      drawBar = args.drawBar,
      drawLine = args.drawLine,
      drawArea = args.drawArea,
      cx = args.cx,
      cy = args.cy,
      xv = args.xv,
      xForText = args.xForText,
      yForText = args.yForText,
      duration = args.duration;

    var translateX,
      scaleX = 1,
      transform,
      flowIndex = flow.index,
      flowLength = flow.length,
      flowStart = $$.getValueOnIndex($$.data.targets[0].values, flowIndex),
      flowEnd = $$.getValueOnIndex(
        $$.data.targets[0].values,
        flowIndex + flowLength
      ),
      orgDomain = $$.x.domain(),
      domain,
      durationForFlow = flow.duration || duration,
      done = flow.done || function() {},
      wait = $$.generateWait();

    var xgrid,
      xgridLines,
      mainRegion,
      mainText,
      mainBar,
      mainLine,
      mainArea,
      mainCircle;

    // set flag
    $$.flowing = true;

    // remove head data after rendered
    $$.data.targets.forEach(function(d) {
      d.values.splice(0, flowLength);
    });

    // update x domain to generate axis elements for flow
    domain = $$.updateXDomain(targets, true, true);
    // update elements related to x scale
    if ($$.updateXGrid) {
      $$.updateXGrid(true);
    }

    xgrid = $$.xgrid || d3.selectAll([]); // xgrid needs to be obtained after updateXGrid
    xgridLines = $$.xgridLines || d3.selectAll([]);
    mainRegion = $$.mainRegion || d3.selectAll([]);
    mainText = $$.mainText || d3.selectAll([]);
    mainBar = $$.mainBar || d3.selectAll([]);
    mainLine = $$.mainLine || d3.selectAll([]);
    mainArea = $$.mainArea || d3.selectAll([]);
    mainCircle = $$.mainCircle || d3.selectAll([]);

    // generate transform to flow
    if (!flow.orgDataCount) {
      // if empty
      if ($$.data.targets[0].values.length !== 1) {
        translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
      } else {
        if ($$.isTimeSeries()) {
          flowStart = $$.getValueOnIndex($$.data.targets[0].values, 0);
          flowEnd = $$.getValueOnIndex(
            $$.data.targets[0].values,
            $$.data.targets[0].values.length - 1
          );
          translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
        } else {
          translateX = diffDomain(domain) / 2;
        }
      }
    } else if (
      flow.orgDataCount === 1 ||
      (flowStart && flowStart.x) === (flowEnd && flowEnd.x)
    ) {
      translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
    } else {
      if ($$.isTimeSeries()) {
        translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
      } else {
        translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
      }
    }
    scaleX = diffDomain(orgDomain) / diffDomain(domain);
    transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';

    $$.hideXGridFocus();

    var flowTransition = d3
      .transition()
      .ease(d3.easeLinear)
      .duration(durationForFlow);
    wait.add($$.xAxis($$.axes.x, flowTransition));
    wait.add(mainBar.transition(flowTransition).attr('transform', transform));
    wait.add(mainLine.transition(flowTransition).attr('transform', transform));
    wait.add(mainArea.transition(flowTransition).attr('transform', transform));
    wait.add(mainCircle.transition(flowTransition).attr('transform', transform));
    wait.add(mainText.transition(flowTransition).attr('transform', transform));
    wait.add(
      mainRegion
        .filter($$.isRegionOnX)
        .transition(flowTransition)
        .attr('transform', transform)
    );
    wait.add(xgrid.transition(flowTransition).attr('transform', transform));
    wait.add(xgridLines.transition(flowTransition).attr('transform', transform));
    wait(function() {
      var i,
        shapes = [],
        texts = [];

      // remove flowed elements
      if (flowLength) {
        for (i = 0; i < flowLength; i++) {
          shapes.push('.' + CLASS.shape + '-' + (flowIndex + i));
          texts.push('.' + CLASS.text + '-' + (flowIndex + i));
        }
        $$.svg
          .selectAll('.' + CLASS.shapes)
          .selectAll(shapes)
          .remove();
        $$.svg
          .selectAll('.' + CLASS.texts)
          .selectAll(texts)
          .remove();
        $$.svg.select('.' + CLASS.xgrid).remove();
      }

      // draw again for removing flowed elements and reverting attr
      xgrid
        .attr('transform', null)
        .attr('x1', $$.xgridAttr.x1)
        .attr('x2', $$.xgridAttr.x2)
        .attr('y1', $$.xgridAttr.y1)
        .attr('y2', $$.xgridAttr.y2)
        .style('opacity', $$.xgridAttr.opacity);
      xgridLines.attr('transform', null);
      xgridLines
        .select('line')
        .attr('x1', config.axis_rotated ? 0 : xv)
        .attr('x2', config.axis_rotated ? $$.width : xv);
      xgridLines
        .select('text')
        .attr('x', config.axis_rotated ? $$.width : 0)
        .attr('y', xv);
      mainBar.attr('transform', null).attr('d', drawBar);
      mainLine.attr('transform', null).attr('d', drawLine);
      mainArea.attr('transform', null).attr('d', drawArea);
      mainCircle
        .attr('transform', null)
        .attr('cx', cx)
        .attr('cy', cy);
      mainText
        .attr('transform', null)
        .attr('x', xForText)
        .attr('y', yForText)
        .style('fill-opacity', $$.opacityForText.bind($$));
      mainRegion.attr('transform', null);
      mainRegion
        .filter($$.isRegionOnX)
        .attr('x', $$.regionX.bind($$))
        .attr('width', $$.regionWidth.bind($$));

      // callback for end of flow
      done();

      $$.flowing = false;
    });
  }
};

Chart.prototype.focus = function(targetIds) {
  var $$ = this.internal,
    candidates;

  targetIds = $$.mapToTargetIds(targetIds)
  ;(candidates = $$.svg.selectAll(
    $$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))
  )),
    this.revert();
  this.defocus();
  candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);
  if ($$.hasArcType()) {
    $$.expandArc(targetIds);
  }
  $$.toggleFocusLegend(targetIds, true);

  $$.focusedTargetIds = targetIds;
  $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function(id) {
    return targetIds.indexOf(id) < 0
  });
};

Chart.prototype.defocus = function(targetIds) {
  var $$ = this.internal,
    candidates;

  targetIds = $$.mapToTargetIds(targetIds)
  ;(candidates = $$.svg.selectAll(
    $$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))
  )),
    candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);
  if ($$.hasArcType()) {
    $$.unexpandArc(targetIds);
  }
  $$.toggleFocusLegend(targetIds, false);

  $$.focusedTargetIds = $$.focusedTargetIds.filter(function(id) {
    return targetIds.indexOf(id) < 0
  });
  $$.defocusedTargetIds = targetIds;
};

Chart.prototype.revert = function(targetIds) {
  var $$ = this.internal,
    candidates;

  targetIds = $$.mapToTargetIds(targetIds);
  candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets

  candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);
  if ($$.hasArcType()) {
    $$.unexpandArc(targetIds);
  }
  if ($$.config.legend_show) {
    $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
    $$.legend
      .selectAll($$.selectorLegends(targetIds))
      .filter(function() {
        return $$.d3.select(this).classed(CLASS.legendItemFocused)
      })
      .classed(CLASS.legendItemFocused, false);
  }

  $$.focusedTargetIds = [];
  $$.defocusedTargetIds = [];
};

Chart.prototype.xgrids = function(grids) {
  var $$ = this.internal,
    config = $$.config;
  if (!grids) {
    return config.grid_x_lines
  }
  config.grid_x_lines = grids;
  $$.redrawWithoutRescale();
  return config.grid_x_lines
};
Chart.prototype.xgrids.add = function(grids) {
  var $$ = this.internal;
  return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []))
};
Chart.prototype.xgrids.remove = function(params) {
  // TODO: multiple
  var $$ = this.internal;
  $$.removeGridLines(params, true);
};

Chart.prototype.ygrids = function(grids) {
  var $$ = this.internal,
    config = $$.config;
  if (!grids) {
    return config.grid_y_lines
  }
  config.grid_y_lines = grids;
  $$.redrawWithoutRescale();
  return config.grid_y_lines
};
Chart.prototype.ygrids.add = function(grids) {
  var $$ = this.internal;
  return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []))
};
Chart.prototype.ygrids.remove = function(params) {
  // TODO: multiple
  var $$ = this.internal;
  $$.removeGridLines(params, false);
};

Chart.prototype.groups = function(groups) {
  var $$ = this.internal,
    config = $$.config;
  if (isUndefined(groups)) {
    return config.data_groups
  }
  config.data_groups = groups;
  $$.redraw();
  return config.data_groups
};

Chart.prototype.legend = function() {};
Chart.prototype.legend.show = function(targetIds) {
  var $$ = this.internal;
  $$.showLegend($$.mapToTargetIds(targetIds));
  $$.updateAndRedraw({ withLegend: true });
};
Chart.prototype.legend.hide = function(targetIds) {
  var $$ = this.internal;
  $$.hideLegend($$.mapToTargetIds(targetIds));
  $$.updateAndRedraw({ withLegend: false });
};

Chart.prototype.load = function(args) {
  var $$ = this.internal,
    config = $$.config;
  // update xs if specified
  if (args.xs) {
    $$.addXs(args.xs);
  }
  // update names if exists
  if ('names' in args) {
    Chart.prototype.data.names.bind(this)(args.names);
  }
  // update classes if exists
  if ('classes' in args) {
    Object.keys(args.classes).forEach(function(id) {
      config.data_classes[id] = args.classes[id];
    });
  }
  // update categories if exists
  if ('categories' in args && $$.isCategorized()) {
    config.axis_x_categories = args.categories;
  }
  // update axes if exists
  if ('axes' in args) {
    Object.keys(args.axes).forEach(function(id) {
      config.data_axes[id] = args.axes[id];
    });
  }
  // update colors if exists
  if ('colors' in args) {
    Object.keys(args.colors).forEach(function(id) {
      config.data_colors[id] = args.colors[id];
    });
  }
  // use cache if exists
  if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
    $$.load($$.getCaches(args.cacheIds), args.done);
    return
  }
  // unload if needed
  if (args.unload) {
    // TODO: do not unload if target will load (included in url/rows/columns)
    $$.unload(
      $$.mapToTargetIds(args.unload === true ? null : args.unload),
      function() {
        $$.loadFromArgs(args);
      }
    );
  } else {
    $$.loadFromArgs(args);
  }
};

Chart.prototype.unload = function(args) {
  var $$ = this.internal;
  args = args || {};
  if (args instanceof Array) {
    args = { ids: args };
  } else if (typeof args === 'string') {
    args = { ids: [args] };
  }
  $$.unload($$.mapToTargetIds(args.ids), function() {
    $$.redraw({
      withUpdateOrgXDomain: true,
      withUpdateXDomain: true,
      withLegend: true
    });
    if (args.done) {
      args.done();
    }
  });
};

Chart.prototype.pie = function() {};

Chart.prototype.pie.padAngle = function(padAngle) {
  if (padAngle === undefined) {
    return this.internal.config.pie_padAngle
  }
  this.internal.config.pie_padAngle = padAngle;
  this.flush();
};

Chart.prototype.regions = function(regions) {
  var $$ = this.internal,
    config = $$.config;
  if (!regions) {
    return config.regions
  }
  config.regions = regions;
  $$.redrawWithoutRescale();
  return config.regions
};
Chart.prototype.regions.add = function(regions) {
  var $$ = this.internal,
    config = $$.config;
  if (!regions) {
    return config.regions
  }
  config.regions = config.regions.concat(regions);
  $$.redrawWithoutRescale();
  return config.regions
};
Chart.prototype.regions.remove = function(options) {
  var $$ = this.internal,
    config = $$.config,
    duration,
    classes,
    regions;

  options = options || {};
  duration = getOption(options, 'duration', config.transition_duration);
  classes = getOption(options, 'classes', [CLASS.region]);

  regions = $$.main.select('.' + CLASS.regions).selectAll(
    classes.map(function(c) {
      return '.' + c
    })
  )
  ;(duration ? regions.transition().duration(duration) : regions)
    .style('opacity', 0)
    .remove();

  config.regions = config.regions.filter(function(region) {
    var found = false;
    if (!region['class']) {
      return true
    }
    region['class'].split(' ').forEach(function(c) {
      if (classes.indexOf(c) >= 0) {
        found = true;
      }
    });
    return !found
  });

  return config.regions
};

Chart.prototype.selected = function(targetId) {
  var $$ = this.internal,
    d3 = $$.d3;
  return $$.main
    .selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(targetId))
    .selectAll('.' + CLASS.shape)
    .filter(function() {
      return d3.select(this).classed(CLASS.SELECTED)
    })
    .nodes()
    .map(function(d) {
      var data = d.__data__;
      return data.data ? data.data : data
    })
};
Chart.prototype.select = function(ids, indices, resetOther) {
  var $$ = this.internal,
    d3 = $$.d3,
    config = $$.config;
  if (!config.data_selection_enabled) {
    return
  }
  $$.main
    .selectAll('.' + CLASS.shapes)
    .selectAll('.' + CLASS.shape)
    .each(function(d, i) {
      var shape = d3.select(this),
        id = d.data ? d.data.id : d.id,
        toggle = $$.getToggle(this, d).bind($$),
        isTargetId =
          config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
        isTargetIndex = !indices || indices.indexOf(i) >= 0,
        isSelected = shape.classed(CLASS.SELECTED);
      // line/area selection not supported yet
      if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
        return
      }
      if (isTargetId && isTargetIndex) {
        if (config.data_selection_isselectable(d) && !isSelected) {
          toggle(true, shape.classed(CLASS.SELECTED, true), d, i);
        }
      } else if (isDefined(resetOther) && resetOther) {
        if (isSelected) {
          toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
        }
      }
    });
};
Chart.prototype.unselect = function(ids, indices) {
  var $$ = this.internal,
    d3 = $$.d3,
    config = $$.config;
  if (!config.data_selection_enabled) {
    return
  }
  $$.main
    .selectAll('.' + CLASS.shapes)
    .selectAll('.' + CLASS.shape)
    .each(function(d, i) {
      var shape = d3.select(this),
        id = d.data ? d.data.id : d.id,
        toggle = $$.getToggle(this, d).bind($$),
        isTargetId =
          config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
        isTargetIndex = !indices || indices.indexOf(i) >= 0,
        isSelected = shape.classed(CLASS.SELECTED);
      // line/area selection not supported yet
      if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
        return
      }
      if (isTargetId && isTargetIndex) {
        if (config.data_selection_isselectable(d)) {
          if (isSelected) {
            toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
          }
        }
      }
    });
};

Chart.prototype.show = function(targetIds, options) {
  var $$ = this.internal,
    targets;

  targetIds = $$.mapToTargetIds(targetIds);
  options = options || {};

  $$.removeHiddenTargetIds(targetIds);
  targets = $$.svg.selectAll($$.selectorTargets(targetIds));

  targets
    .transition()
    .style('display', isIE() ? 'block' : 'initial', 'important')
    .style('opacity', 1, 'important')
    .call($$.endall, function() {
      targets.style('opacity', null).style('opacity', 1);
    });

  if (options.withLegend) {
    $$.showLegend(targetIds);
  }

  $$.redraw({
    withUpdateOrgXDomain: true,
    withUpdateXDomain: true,
    withLegend: true
  });
};

Chart.prototype.hide = function(targetIds, options) {
  var $$ = this.internal,
    targets;

  targetIds = $$.mapToTargetIds(targetIds);
  options = options || {};

  $$.addHiddenTargetIds(targetIds);
  targets = $$.svg.selectAll($$.selectorTargets(targetIds));

  targets
    .transition()
    .style('opacity', 0, 'important')
    .call($$.endall, function() {
      targets.style('opacity', null).style('opacity', 0);
      targets.style('display', 'none');
    });

  if (options.withLegend) {
    $$.hideLegend(targetIds);
  }

  $$.redraw({
    withUpdateOrgXDomain: true,
    withUpdateXDomain: true,
    withLegend: true
  });
};

Chart.prototype.toggle = function(targetIds, options) {
  var that = this,
    $$ = this.internal;
  $$.mapToTargetIds(targetIds).forEach(function(targetId) {
    $$.isTargetToShow(targetId)
      ? that.hide(targetId, options)
      : that.show(targetId, options);
  });
};

Chart.prototype.subchart = function() {};

Chart.prototype.subchart.isShown = function() {
  const $$ = this.internal;

  return $$.config.subchart_show
};

Chart.prototype.subchart.show = function() {
  const $$ = this.internal;

  if ($$.config.subchart_show) {
    return
  }

  $$.config.subchart_show = true;

  // insert DOM
  $$.initSubchart();

  // update dimensions with sub chart now visible
  $$.updateDimension();

  // insert brush (depends on sizes previously updated)
  $$.initSubchartBrush();

  // attach data
  $$.updateTargetsForSubchart($$.getTargets());

  // reset fade-in state
  $$.mapToIds($$.data.targets).forEach(function(id) {
    $$.withoutFadeIn[id] = false;
  });

  // redraw chart !
  $$.updateAndRedraw();

  // update visible targets !
  $$.showTargets();
};

Chart.prototype.subchart.hide = function() {
  const $$ = this.internal;

  if (!$$.config.subchart_show) {
    return
  }

  $$.config.subchart_show = false;

  // remove DOM
  $$.removeSubchart();

  // re-render chart
  $$.redraw();
};

Chart.prototype.tooltip = function() {};
Chart.prototype.tooltip.show = function(args) {
  var $$ = this.internal,
    targets,
    data,
    mouse = {};

  // determine mouse position on the chart
  if (args.mouse) {
    mouse = args.mouse;
  } else {
    // determine focus data
    if (args.data) {
      data = args.data;
    } else if (typeof args.x !== 'undefined') {
      if (args.id) {
        targets = $$.data.targets.filter(function(t) {
          return t.id === args.id
        });
      } else {
        targets = $$.data.targets;
      }
      data = $$.filterByX(targets, args.x).slice(0, 1)[0];
    }
    mouse = data ? $$.getMousePosition(data) : null;
  }

  // emulate mouse events to show
  $$.dispatchEvent('mousemove', mouse);

  $$.config.tooltip_onshow.call($$, data);
};
Chart.prototype.tooltip.hide = function() {
  // TODO: get target data by checking the state of focus
  this.internal.dispatchEvent('mouseout', 0);

  this.internal.config.tooltip_onhide.call(this);
};

Chart.prototype.transform = function(type, targetIds) {
  var $$ = this.internal,
    options =
      ['pie', 'donut'].indexOf(type) >= 0 ? { withTransform: true } : null;
  $$.transformTo(targetIds, type, options);
};

ChartInternal.prototype.transformTo = function(
  targetIds,
  type,
  optionsForRedraw
) {
  var $$ = this,
    withTransitionForAxis = !$$.hasArcType(),
    options = optionsForRedraw || {
      withTransitionForAxis: withTransitionForAxis
    };
  options.withTransitionForTransform = false;
  $$.transiting = false;
  $$.setTargetType(targetIds, type);
  $$.updateTargets($$.data.targets); // this is needed when transforming to arc
  $$.updateAndRedraw(options);
};

Chart.prototype.x = function(x) {
  var $$ = this.internal;
  if (arguments.length) {
    $$.updateTargetX($$.data.targets, x);
    $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
  }
  return $$.data.xs
};
Chart.prototype.xs = function(xs) {
  var $$ = this.internal;
  if (arguments.length) {
    $$.updateTargetXs($$.data.targets, xs);
    $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
  }
  return $$.data.xs
};

Chart.prototype.zoom = function(domain) {
  var $$ = this.internal;
  if (domain) {
    if ($$.isTimeSeries()) {
      domain = domain.map(function(x) {
        return $$.parseDate(x)
      });
    }
    if ($$.config.subchart_show) {
      $$.brush.selectionAsValue(domain, true);
    } else {
      $$.updateXDomain(null, true, false, false, domain);
      $$.redraw({ withY: $$.config.zoom_rescale, withSubchart: false });
    }
    $$.config.zoom_onzoom.call(this, $$.x.orgDomain());
    return domain
  } else {
    return $$.x.domain()
  }
};
Chart.prototype.zoom.enable = function(enabled) {
  var $$ = this.internal;
  $$.config.zoom_enabled = enabled;
  $$.updateAndRedraw();
};
Chart.prototype.unzoom = function() {
  var $$ = this.internal;
  if ($$.config.subchart_show) {
    $$.brush.clear();
  } else {
    $$.updateXDomain(null, true, false, false, $$.subX.domain());
    $$.redraw({ withY: $$.config.zoom_rescale, withSubchart: false });
  }
};

Chart.prototype.zoom.max = function(max) {
  var $$ = this.internal,
    config = $$.config,
    d3 = $$.d3;
  if (max === 0 || max) {
    config.zoom_x_max = d3.max([$$.orgXDomain[1], max]);
  } else {
    return config.zoom_x_max
  }
};

Chart.prototype.zoom.min = function(min) {
  var $$ = this.internal,
    config = $$.config,
    d3 = $$.d3;
  if (min === 0 || min) {
    config.zoom_x_min = d3.min([$$.orgXDomain[0], min]);
  } else {
    return config.zoom_x_min
  }
};

Chart.prototype.zoom.range = function(range) {
  if (arguments.length) {
    if (isDefined(range.max)) {
      this.domain.max(range.max);
    }
    if (isDefined(range.min)) {
      this.domain.min(range.min);
    }
  } else {
    return {
      max: this.domain.max(),
      min: this.domain.min()
    }
  }
};

ChartInternal.prototype.initPie = function() {
  var $$ = this,
    d3 = $$.d3;
  $$.pie = d3
    .pie()
    .padAngle(this.getPadAngle.bind(this))
    .value(function(d) {
      return d.values.reduce(function(a, b) {
        return a + b.value
      }, 0)
    });

  let orderFct = $$.getOrderFunction();

  // we need to reverse the returned order if asc or desc to have the slice in expected order.
  if (orderFct && ($$.isOrderAsc() || $$.isOrderDesc())) {
    let defaultSort = orderFct;
    orderFct = (t1, t2) => defaultSort(t1, t2) * -1;
  }

  $$.pie.sort(orderFct || null);
};

ChartInternal.prototype.updateRadius = function() {
  var $$ = this,
    config = $$.config,
    w = config.gauge_width || config.donut_width,
    gaugeArcWidth =
      $$.filterTargetsToShow($$.data.targets).length *
      $$.config.gauge_arcs_minWidth;
  $$.radiusExpanded =
    (Math.min($$.arcWidth, $$.arcHeight) / 2) * ($$.hasType('gauge') ? 0.85 : 1);
  $$.radius = $$.radiusExpanded * 0.95;
  $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
  $$.innerRadius =
    $$.hasType('donut') || $$.hasType('gauge')
      ? $$.radius * $$.innerRadiusRatio
      : 0;
  $$.gaugeArcWidth = w
    ? w
    : gaugeArcWidth <= $$.radius - $$.innerRadius
    ? $$.radius - $$.innerRadius
    : gaugeArcWidth <= $$.radius
    ? gaugeArcWidth
    : $$.radius;
};

ChartInternal.prototype.getPadAngle = function() {
  if (this.hasType('pie')) {
    return this.config.pie_padAngle || 0
  } else if (this.hasType('donut')) {
    return this.config.donut_padAngle || 0
  } else {
    return 0
  }
};

ChartInternal.prototype.updateArc = function() {
  var $$ = this;
  $$.svgArc = $$.getSvgArc();
  $$.svgArcExpanded = $$.getSvgArcExpanded();
  $$.svgArcExpandedSub = $$.getSvgArcExpanded(0.98);
};

ChartInternal.prototype.updateAngle = function(d) {
  var $$ = this,
    config = $$.config,
    found = false,
    index = 0,
    gMin,
    gMax,
    gTic,
    gValue;

  if (!config) {
    return null
  }

  $$.pie($$.filterTargetsToShow($$.data.targets)).forEach(function(t) {
    if (!found && t.data.id === d.data.id) {
      found = true;
      d = t;
      d.index = index;
    }
    index++;
  });
  if (isNaN(d.startAngle)) {
    d.startAngle = 0;
  }
  if (isNaN(d.endAngle)) {
    d.endAngle = d.startAngle;
  }
  if ($$.isGaugeType(d.data)) {
    gMin = config.gauge_min;
    gMax = config.gauge_max;
    gTic = (Math.PI * (config.gauge_fullCircle ? 2 : 1)) / (gMax - gMin);
    gValue = d.value < gMin ? 0 : d.value < gMax ? d.value - gMin : gMax - gMin;
    d.startAngle = config.gauge_startingAngle;
    d.endAngle = d.startAngle + gTic * gValue;
  }
  return found ? d : null
};

ChartInternal.prototype.getSvgArc = function() {
  var $$ = this,
    hasGaugeType = $$.hasType('gauge'),
    singleArcWidth =
      $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
    arc = $$.d3
      .arc()
      .outerRadius(function(d) {
        return hasGaugeType ? $$.radius - singleArcWidth * d.index : $$.radius
      })
      .innerRadius(function(d) {
        return hasGaugeType
          ? $$.radius - singleArcWidth * (d.index + 1)
          : $$.innerRadius
      }),
    newArc = function(d, withoutUpdate) {
      var updated;
      if (withoutUpdate) {
        return arc(d)
      } // for interpolate
      updated = $$.updateAngle(d);
      return updated ? arc(updated) : 'M 0 0'
    };
  // TODO: extends all function
  newArc.centroid = arc.centroid;
  return newArc
};

ChartInternal.prototype.getSvgArcExpanded = function(rate) {
  rate = rate || 1;
  var $$ = this,
    hasGaugeType = $$.hasType('gauge'),
    singleArcWidth =
      $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
    expandWidth = Math.min(
      $$.radiusExpanded * rate - $$.radius,
      singleArcWidth * 0.8 - (1 - rate) * 100
    ),
    arc = $$.d3
      .arc()
      .outerRadius(function(d) {
        return hasGaugeType
          ? $$.radius - singleArcWidth * d.index + expandWidth
          : $$.radiusExpanded * rate
      })
      .innerRadius(function(d) {
        return hasGaugeType
          ? $$.radius - singleArcWidth * (d.index + 1)
          : $$.innerRadius
      });
  return function(d) {
    var updated = $$.updateAngle(d);
    return updated ? arc(updated) : 'M 0 0'
  }
};

ChartInternal.prototype.getArc = function(d, withoutUpdate, force) {
  return force || this.isArcType(d.data)
    ? this.svgArc(d, withoutUpdate)
    : 'M 0 0'
};

ChartInternal.prototype.transformForArcLabel = function(d) {
  var $$ = this,
    config = $$.config,
    updated = $$.updateAngle(d),
    c,
    x,
    y,
    h,
    ratio,
    translate = '',
    hasGauge = $$.hasType('gauge');
  if (updated && !hasGauge) {
    c = this.svgArc.centroid(updated);
    x = isNaN(c[0]) ? 0 : c[0];
    y = isNaN(c[1]) ? 0 : c[1];
    h = Math.sqrt(x * x + y * y);
    if ($$.hasType('donut') && config.donut_label_ratio) {
      ratio = isFunction(config.donut_label_ratio)
        ? config.donut_label_ratio(d, $$.radius, h)
        : config.donut_label_ratio;
    } else if ($$.hasType('pie') && config.pie_label_ratio) {
      ratio = isFunction(config.pie_label_ratio)
        ? config.pie_label_ratio(d, $$.radius, h)
        : config.pie_label_ratio;
    } else {
      ratio =
        $$.radius && h
          ? ((36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) *
              $$.radius) /
            h
          : 0;
    }
    translate = 'translate(' + x * ratio + ',' + y * ratio + ')';
  } else if (
    updated &&
    hasGauge &&
    $$.filterTargetsToShow($$.data.targets).length > 1
  ) {
    var y1 = Math.sin(updated.endAngle - Math.PI / 2);
    x = Math.cos(updated.endAngle - Math.PI / 2) * ($$.radiusExpanded + 25);
    y = y1 * ($$.radiusExpanded + 15 - Math.abs(y1 * 10)) + 3;
    translate = 'translate(' + x + ',' + y + ')';
  }
  return translate
};

/**
 * @deprecated Use `getRatio('arc', d)` instead.
 */
ChartInternal.prototype.getArcRatio = function(d) {
  return this.getRatio('arc', d)
};

ChartInternal.prototype.convertToArcData = function(d) {
  return this.addName({
    id: d.data.id,
    value: d.value,
    ratio: this.getRatio('arc', d),
    index: d.index
  })
};

ChartInternal.prototype.textForArcLabel = function(d) {
  var $$ = this,
    updated,
    value,
    ratio,
    id,
    format;
  if (!$$.shouldShowArcLabel()) {
    return ''
  }
  updated = $$.updateAngle(d);
  value = updated ? updated.value : null;
  ratio = $$.getRatio('arc', updated);
  id = d.data.id;
  if (!$$.hasType('gauge') && !$$.meetsArcLabelThreshold(ratio)) {
    return ''
  }
  format = $$.getArcLabelFormat();
  return format
    ? format(value, ratio, id)
    : $$.defaultArcValueFormat(value, ratio)
};

ChartInternal.prototype.textForGaugeMinMax = function(value, isMax) {
  var $$ = this,
    format = $$.getGaugeLabelExtents();

  return format ? format(value, isMax) : value
};

ChartInternal.prototype.expandArc = function(targetIds) {
  var $$ = this,
    interval;

  // MEMO: avoid to cancel transition
  if ($$.transiting) {
    interval = window.setInterval(function() {
      if (!$$.transiting) {
        window.clearInterval(interval);
        if ($$.legend.selectAll('.c3-legend-item-focused').size() > 0) {
          $$.expandArc(targetIds);
        }
      }
    }, 10);
    return
  }

  targetIds = $$.mapToTargetIds(targetIds);

  $$.svg
    .selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc))
    .each(function(d) {
      if (!$$.shouldExpand(d.data.id)) {
        return
      }
      $$.d3
        .select(this)
        .selectAll('path')
        .transition()
        .duration($$.expandDuration(d.data.id))
        .attr('d', $$.svgArcExpanded)
        .transition()
        .duration($$.expandDuration(d.data.id) * 2)
        .attr('d', $$.svgArcExpandedSub)
        .each(function(d) {
          if ($$.isDonutType(d.data)) ;
        });
    });
};

ChartInternal.prototype.unexpandArc = function(targetIds) {
  var $$ = this;

  if ($$.transiting) {
    return
  }

  targetIds = $$.mapToTargetIds(targetIds);

  $$.svg
    .selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc))
    .selectAll('path')
    .transition()
    .duration(function(d) {
      return $$.expandDuration(d.data.id)
    })
    .attr('d', $$.svgArc);
  $$.svg.selectAll('.' + CLASS.arc);
};

ChartInternal.prototype.expandDuration = function(id) {
  var $$ = this,
    config = $$.config;

  if ($$.isDonutType(id)) {
    return config.donut_expand_duration
  } else if ($$.isGaugeType(id)) {
    return config.gauge_expand_duration
  } else if ($$.isPieType(id)) {
    return config.pie_expand_duration
  } else {
    return 50
  }
};

ChartInternal.prototype.shouldExpand = function(id) {
  var $$ = this,
    config = $$.config;
  return (
    ($$.isDonutType(id) && config.donut_expand) ||
    ($$.isGaugeType(id) && config.gauge_expand) ||
    ($$.isPieType(id) && config.pie_expand)
  )
};

ChartInternal.prototype.shouldShowArcLabel = function() {
  var $$ = this,
    config = $$.config,
    shouldShow = true;
  if ($$.hasType('donut')) {
    shouldShow = config.donut_label_show;
  } else if ($$.hasType('pie')) {
    shouldShow = config.pie_label_show;
  }
  // when gauge, always true
  return shouldShow
};

ChartInternal.prototype.meetsArcLabelThreshold = function(ratio) {
  var $$ = this,
    config = $$.config,
    threshold = $$.hasType('donut')
      ? config.donut_label_threshold
      : config.pie_label_threshold;
  return ratio >= threshold
};

ChartInternal.prototype.getArcLabelFormat = function() {
  var $$ = this,
    config = $$.config,
    format = config.pie_label_format;
  if ($$.hasType('gauge')) {
    format = config.gauge_label_format;
  } else if ($$.hasType('donut')) {
    format = config.donut_label_format;
  }
  return format
};

ChartInternal.prototype.getGaugeLabelExtents = function() {
  var $$ = this,
    config = $$.config;
  return config.gauge_label_extents
};

ChartInternal.prototype.getArcTitle = function() {
  var $$ = this;
  return $$.hasType('donut') ? $$.config.donut_title : ''
};

ChartInternal.prototype.updateTargetsForArc = function(targets) {
  var $$ = this,
    main = $$.main,
    mainPies,
    mainPieEnter,
    classChartArc = $$.classChartArc.bind($$),
    classArcs = $$.classArcs.bind($$),
    classFocus = $$.classFocus.bind($$);
  mainPies = main
    .select('.' + CLASS.chartArcs)
    .selectAll('.' + CLASS.chartArc)
    .data($$.pie(targets))
    .attr('class', function(d) {
      return classChartArc(d) + classFocus(d.data)
    });
  mainPieEnter = mainPies
    .enter()
    .append('g')
    .attr('class', classChartArc);
  mainPieEnter.append('g').attr('class', classArcs);
  mainPieEnter
    .append('text')
    .attr('dy', $$.hasType('gauge') ? '-.1em' : '.35em')
    .style('opacity', 0)
    .style('text-anchor', 'middle')
    .style('pointer-events', 'none');
  // MEMO: can not keep same color..., but not bad to update color in redraw
  //mainPieUpdate.exit().remove();
};

ChartInternal.prototype.initArc = function() {
  var $$ = this;
  $$.arcs = $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartArcs)
    .attr('transform', $$.getTranslate('arc'));
  $$.arcs
    .append('text')
    .attr('class', CLASS.chartArcsTitle)
    .style('text-anchor', 'middle')
    .text($$.getArcTitle());
};

ChartInternal.prototype.redrawArc = function(
  duration,
  durationForExit,
  withTransform
) {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    main = $$.main,
    arcs,
    mainArc,
    arcLabelLines,
    mainArcLabelLine,
    hasGaugeType = $$.hasType('gauge');
  arcs = main
    .selectAll('.' + CLASS.arcs)
    .selectAll('.' + CLASS.arc)
    .data($$.arcData.bind($$));
  mainArc = arcs
    .enter()
    .append('path')
    .attr('class', $$.classArc.bind($$))
    .style('fill', function(d) {
      return $$.color(d.data)
    })
    .style('cursor', function(d) {
      return config.interaction_enabled && config.data_selection_isselectable(d)
        ? 'pointer'
        : null
    })
    .each(function(d) {
      if ($$.isGaugeType(d.data)) {
        d.startAngle = d.endAngle = config.gauge_startingAngle;
      }
      this._current = d;
    })
    .merge(arcs);
  if (hasGaugeType) {
    arcLabelLines = main
      .selectAll('.' + CLASS.arcs)
      .selectAll('.' + CLASS.arcLabelLine)
      .data($$.arcData.bind($$));
    mainArcLabelLine = arcLabelLines
      .enter()
      .append('rect')
      .attr('class', function(d) {
        return (
          CLASS.arcLabelLine +
          ' ' +
          CLASS.target +
          ' ' +
          CLASS.target +
          '-' +
          d.data.id
        )
      })
      .merge(arcLabelLines);

    if ($$.filterTargetsToShow($$.data.targets).length === 1) {
      mainArcLabelLine.style('display', 'none');
    } else {
      mainArcLabelLine
        .style('fill', function(d) {
          return $$.levelColor
            ? $$.levelColor(
                d.data.values.reduce(function(total, item) {
                  return total + item.value
                }, 0)
              )
            : $$.color(d.data)
        })
        .style('display', config.gauge_labelLine_show ? '' : 'none')
        .each(function(d) {
          var lineLength = 0,
            lineThickness = 2,
            x = 0,
            y = 0,
            transform = '';
          if ($$.hiddenTargetIds.indexOf(d.data.id) < 0) {
            var updated = $$.updateAngle(d),
              innerLineLength =
                ($$.gaugeArcWidth /
                  $$.filterTargetsToShow($$.data.targets).length) *
                (updated.index + 1),
              lineAngle = updated.endAngle - Math.PI / 2,
              arcInnerRadius = $$.radius - innerLineLength,
              linePositioningAngle =
                lineAngle - (arcInnerRadius === 0 ? 0 : 1 / arcInnerRadius);
            lineLength = $$.radiusExpanded - $$.radius + innerLineLength;
            x = Math.cos(linePositioningAngle) * arcInnerRadius;
            y = Math.sin(linePositioningAngle) * arcInnerRadius;
            transform =
              'rotate(' +
              (lineAngle * 180) / Math.PI +
              ', ' +
              x +
              ', ' +
              y +
              ')';
          }
          d3.select(this)
            .attr('x', x)
            .attr('y', y)
            .attr('width', lineLength)
            .attr('height', lineThickness)
            .attr('transform', transform)
            .style(
              'stroke-dasharray',
              '0, ' + (lineLength + lineThickness) + ', 0'
            );
        });
    }
  }
  mainArc
    .attr('transform', function(d) {
      return !$$.isGaugeType(d.data) && withTransform ? 'scale(0)' : ''
    })
    .on(
      'mouseover',
      config.interaction_enabled
        ? function(d) {
            var updated, arcData;
            if ($$.transiting) {
              // skip while transiting
              return
            }
            updated = $$.updateAngle(d);
            if (updated) {
              arcData = $$.convertToArcData(updated);
              // transitions
              $$.expandArc(updated.data.id);
              $$.api.focus(updated.data.id);
              $$.toggleFocusLegend(updated.data.id, true);
              $$.config.data_onmouseover(arcData, this);
            }
          }
        : null
    )
    .on(
      'mousemove',
      config.interaction_enabled
        ? function(d) {
            var updated = $$.updateAngle(d),
              arcData,
              selectedData;
            if (updated) {
(arcData = $$.convertToArcData(updated)),
                (selectedData = [arcData]);
              $$.showTooltip(selectedData, this);
            }
          }
        : null
    )
    .on(
      'mouseout',
      config.interaction_enabled
        ? function(d) {
            var updated, arcData;
            if ($$.transiting) {
              // skip while transiting
              return
            }
            updated = $$.updateAngle(d);
            if (updated) {
              arcData = $$.convertToArcData(updated);
              // transitions
              $$.unexpandArc(updated.data.id);
              $$.api.revert();
              $$.revertLegend();
              $$.hideTooltip();
              $$.config.data_onmouseout(arcData, this);
            }
          }
        : null
    )
    .on(
      'click',
      config.interaction_enabled
        ? function(d, i) {
            var updated = $$.updateAngle(d),
              arcData;
            if (updated) {
              arcData = $$.convertToArcData(updated);
              if ($$.toggleShape) {
                $$.toggleShape(this, arcData, i);
              }
              $$.config.data_onclick.call($$.api, arcData, this);
            }
          }
        : null
    )
    .each(function() {
      $$.transiting = true;
    })
    .transition()
    .duration(duration)
    .attrTween('d', function(d) {
      var updated = $$.updateAngle(d),
        interpolate;
      if (!updated) {
        return function() {
          return 'M 0 0'
        }
      }
      //                if (this._current === d) {
      //                    this._current = {
      //                        startAngle: Math.PI*2,
      //                        endAngle: Math.PI*2,
      //                    };
      //                }
      if (isNaN(this._current.startAngle)) {
        this._current.startAngle = 0;
      }
      if (isNaN(this._current.endAngle)) {
        this._current.endAngle = this._current.startAngle;
      }
      interpolate = d3.interpolate(this._current, updated);
      this._current = interpolate(0);
      return function(t) {
        // prevents crashing the charts once in transition and chart.destroy() has been called
        if ($$.config === null) {
          return 'M 0 0'
        }
        var interpolated = interpolate(t);
        interpolated.data = d.data; // data.id will be updated by interporator
        return $$.getArc(interpolated, true)
      }
    })
    .attr('transform', withTransform ? 'scale(1)' : '')
    .style('fill', function(d) {
      return $$.levelColor
        ? $$.levelColor(
            d.data.values.reduce(function(total, item) {
              return total + item.value
            }, 0)
          )
        : $$.color(d.data.id)
    }) // Where gauge reading color would receive customization.
    .call($$.endall, function() {
      $$.transiting = false;
    });
  arcs
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0)
    .remove();
  main
    .selectAll('.' + CLASS.chartArc)
    .select('text')
    .style('opacity', 0)
    .attr('class', function(d) {
      return $$.isGaugeType(d.data) ? CLASS.gaugeValue : ''
    })
    .text($$.textForArcLabel.bind($$))
    .attr('transform', $$.transformForArcLabel.bind($$))
    .style('font-size', function(d) {
      return $$.isGaugeType(d.data) &&
        $$.filterTargetsToShow($$.data.targets).length === 1
        ? Math.round($$.radius / 5) + 'px'
        : ''
    })
    .transition()
    .duration(duration)
    .style('opacity', function(d) {
      return $$.isTargetToShow(d.data.id) && $$.isArcType(d.data) ? 1 : 0
    });
  main
    .select('.' + CLASS.chartArcsTitle)
    .style('opacity', $$.hasType('donut') || hasGaugeType ? 1 : 0);

  if (hasGaugeType) {
    let index = 0;
    const backgroundArc = $$.arcs
      .select('g.' + CLASS.chartArcsBackground)
      .selectAll('path.' + CLASS.chartArcsBackground)
      .data($$.data.targets);

    backgroundArc
      .enter()
      .append('path')
      .attr(
        'class',
        (d, i) =>
          CLASS.chartArcsBackground + ' ' + CLASS.chartArcsBackground + '-' + i
      )
      .merge(backgroundArc)
      .attr('d', d1 => {
        if ($$.hiddenTargetIds.indexOf(d1.id) >= 0) {
          return 'M 0 0'
        }

        var d = {
          data: [{ value: config.gauge_max }],
          startAngle: config.gauge_startingAngle,
          endAngle:
            -1 *
            config.gauge_startingAngle *
            (config.gauge_fullCircle ? Math.PI : 1),
          index: index++
        };
        return $$.getArc(d, true, true)
      });

    backgroundArc.exit().remove();

    $$.arcs
      .select('.' + CLASS.chartArcsGaugeUnit)
      .attr('dy', '.75em')
      .text(config.gauge_label_show ? config.gauge_units : '');
    $$.arcs
      .select('.' + CLASS.chartArcsGaugeMin)
      .attr(
        'dx',
        -1 *
          ($$.innerRadius +
            ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2)) +
          'px'
      )
      .attr('dy', '1.2em')
      .text(
        config.gauge_label_show
          ? $$.textForGaugeMinMax(config.gauge_min, false)
          : ''
      );
    $$.arcs
      .select('.' + CLASS.chartArcsGaugeMax)
      .attr(
        'dx',
        $$.innerRadius +
          ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2) +
          'px'
      )
      .attr('dy', '1.2em')
      .text(
        config.gauge_label_show
          ? $$.textForGaugeMinMax(config.gauge_max, true)
          : ''
      );
  }
};
ChartInternal.prototype.initGauge = function() {
  var arcs = this.arcs;
  if (this.hasType('gauge')) {
    arcs.append('g').attr('class', CLASS.chartArcsBackground);
    arcs
      .append('text')
      .attr('class', CLASS.chartArcsGaugeUnit)
      .style('text-anchor', 'middle')
      .style('pointer-events', 'none');
    arcs
      .append('text')
      .attr('class', CLASS.chartArcsGaugeMin)
      .style('text-anchor', 'middle')
      .style('pointer-events', 'none');
    arcs
      .append('text')
      .attr('class', CLASS.chartArcsGaugeMax)
      .style('text-anchor', 'middle')
      .style('pointer-events', 'none');
  }
};
ChartInternal.prototype.getGaugeLabelHeight = function() {
  return this.config.gauge_label_show ? 20 : 0
};

/**
 * Store value into cache
 *
 * @param key
 * @param value
 */
ChartInternal.prototype.addToCache = function(key, value) {
  this.cache[`$${key}`] = value;
};

/**
 * Returns a cached value or undefined
 *
 * @param key
 * @return {*}
 */
ChartInternal.prototype.getFromCache = function(key) {
  return this.cache[`$${key}`]
};

/**
 * Reset cached data
 */
ChartInternal.prototype.resetCache = function() {
  Object.keys(this.cache)
    .filter(key => /^\$/.test(key))
    .forEach(key => {
      delete this.cache[key];
    });
};

// Old API that stores Targets

ChartInternal.prototype.hasCaches = function(ids) {
  for (var i = 0; i < ids.length; i++) {
    if (!(ids[i] in this.cache)) {
      return false
    }
  }
  return true
};
ChartInternal.prototype.addCache = function(id, target) {
  this.cache[id] = this.cloneTarget(target);
};
ChartInternal.prototype.getCaches = function(ids) {
  var targets = [],
    i;
  for (i = 0; i < ids.length; i++) {
    if (ids[i] in this.cache) {
      targets.push(this.cloneTarget(this.cache[ids[i]]));
    }
  }
  return targets
};

ChartInternal.prototype.categoryName = function(i) {
  var config = this.config;
  return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i
};

ChartInternal.prototype.generateTargetClass = function(targetId) {
  return targetId || targetId === 0 ? ('-' + targetId).replace(/\s/g, '-') : ''
};
ChartInternal.prototype.generateClass = function(prefix, targetId) {
  return ' ' + prefix + ' ' + prefix + this.generateTargetClass(targetId)
};
ChartInternal.prototype.classText = function(d) {
  return this.generateClass(CLASS.text, d.index)
};
ChartInternal.prototype.classTexts = function(d) {
  return this.generateClass(CLASS.texts, d.id)
};
ChartInternal.prototype.classShape = function(d) {
  return this.generateClass(CLASS.shape, d.index)
};
ChartInternal.prototype.classShapes = function(d) {
  return this.generateClass(CLASS.shapes, d.id)
};
ChartInternal.prototype.classLine = function(d) {
  return this.classShape(d) + this.generateClass(CLASS.line, d.id)
};
ChartInternal.prototype.classLines = function(d) {
  return this.classShapes(d) + this.generateClass(CLASS.lines, d.id)
};
ChartInternal.prototype.classCircle = function(d) {
  return this.classShape(d) + this.generateClass(CLASS.circle, d.index)
};
ChartInternal.prototype.classCircles = function(d) {
  return this.classShapes(d) + this.generateClass(CLASS.circles, d.id)
};
ChartInternal.prototype.classBar = function(d) {
  return this.classShape(d) + this.generateClass(CLASS.bar, d.index)
};
ChartInternal.prototype.classBars = function(d) {
  return this.classShapes(d) + this.generateClass(CLASS.bars, d.id)
};
ChartInternal.prototype.classArc = function(d) {
  return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id)
};
ChartInternal.prototype.classArcs = function(d) {
  return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id)
};
ChartInternal.prototype.classArea = function(d) {
  return this.classShape(d) + this.generateClass(CLASS.area, d.id)
};
ChartInternal.prototype.classAreas = function(d) {
  return this.classShapes(d) + this.generateClass(CLASS.areas, d.id)
};
ChartInternal.prototype.classRegion = function(d, i) {
  return (
    this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '')
  )
};
ChartInternal.prototype.classEvent = function(d) {
  return this.generateClass(CLASS.eventRect, d.index)
};
ChartInternal.prototype.classTarget = function(id) {
  var $$ = this;
  var additionalClassSuffix = $$.config.data_classes[id],
    additionalClass = '';
  if (additionalClassSuffix) {
    additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
  }
  return $$.generateClass(CLASS.target, id) + additionalClass
};
ChartInternal.prototype.classFocus = function(d) {
  return this.classFocused(d) + this.classDefocused(d)
};
ChartInternal.prototype.classFocused = function(d) {
  return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '')
};
ChartInternal.prototype.classDefocused = function(d) {
  return (
    ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '')
  )
};
ChartInternal.prototype.classChartText = function(d) {
  return CLASS.chartText + this.classTarget(d.id)
};
ChartInternal.prototype.classChartLine = function(d) {
  return CLASS.chartLine + this.classTarget(d.id)
};
ChartInternal.prototype.classChartBar = function(d) {
  return CLASS.chartBar + this.classTarget(d.id)
};
ChartInternal.prototype.classChartArc = function(d) {
  return CLASS.chartArc + this.classTarget(d.data.id)
};
ChartInternal.prototype.getTargetSelectorSuffix = function(targetId) {
  const targetClass = this.generateTargetClass(targetId);
  if (window.CSS && window.CSS.escape) {
    return window.CSS.escape(targetClass)
  }

  // fallback on imperfect method for old browsers (does not handles unicode)
  return targetClass.replace(/([?!@#$%^&*()=+,.<>'":;\[\]\/|~`{}\\])/g, '\\$1')
};
ChartInternal.prototype.selectorTarget = function(id, prefix) {
  return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id)
};
ChartInternal.prototype.selectorTargets = function(ids, prefix) {
  var $$ = this;
  ids = ids || [];
  return ids.length
    ? ids.map(function(id) {
        return $$.selectorTarget(id, prefix)
      })
    : null
};
ChartInternal.prototype.selectorLegend = function(id) {
  return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id)
};
ChartInternal.prototype.selectorLegends = function(ids) {
  var $$ = this;
  return ids && ids.length
    ? ids.map(function(id) {
        return $$.selectorLegend(id)
      })
    : null
};

ChartInternal.prototype.getClipPath = function(id) {
  return 'url(' + (isIE(9) ? '' : document.URL.split('#')[0]) + '#' + id + ')'
};
ChartInternal.prototype.appendClip = function(parent, id) {
  return parent
    .append('clipPath')
    .attr('id', id)
    .append('rect')
};
ChartInternal.prototype.getAxisClipX = function(forHorizontal) {
  // axis line width + padding for left
  var left = Math.max(30, this.margin.left);
  return forHorizontal ? -(1 + left) : -(left - 1)
};
ChartInternal.prototype.getAxisClipY = function(forHorizontal) {
  return forHorizontal ? -20 : -this.margin.top
};
ChartInternal.prototype.getXAxisClipX = function() {
  var $$ = this;
  return $$.getAxisClipX(!$$.config.axis_rotated)
};
ChartInternal.prototype.getXAxisClipY = function() {
  var $$ = this;
  return $$.getAxisClipY(!$$.config.axis_rotated)
};
ChartInternal.prototype.getYAxisClipX = function() {
  var $$ = this;
  return $$.config.axis_y_inner ? -1 : $$.getAxisClipX($$.config.axis_rotated)
};
ChartInternal.prototype.getYAxisClipY = function() {
  var $$ = this;
  return $$.getAxisClipY($$.config.axis_rotated)
};
ChartInternal.prototype.getAxisClipWidth = function(forHorizontal) {
  var $$ = this,
    left = Math.max(30, $$.margin.left),
    right = Math.max(30, $$.margin.right);
  // width + axis line width + padding for left/right
  return forHorizontal ? $$.width + 2 + left + right : $$.margin.left + 20
};
ChartInternal.prototype.getAxisClipHeight = function(forHorizontal) {
  // less than 20 is not enough to show the axis label 'outer' without legend
  return (
    (forHorizontal ? this.margin.bottom : this.margin.top + this.height) + 20
  )
};
ChartInternal.prototype.getXAxisClipWidth = function() {
  var $$ = this;
  return $$.getAxisClipWidth(!$$.config.axis_rotated)
};
ChartInternal.prototype.getXAxisClipHeight = function() {
  var $$ = this;
  return $$.getAxisClipHeight(!$$.config.axis_rotated)
};
ChartInternal.prototype.getYAxisClipWidth = function() {
  var $$ = this;
  return (
    $$.getAxisClipWidth($$.config.axis_rotated) +
    ($$.config.axis_y_inner ? 20 : 0)
  )
};
ChartInternal.prototype.getYAxisClipHeight = function() {
  var $$ = this;
  return $$.getAxisClipHeight($$.config.axis_rotated)
};

ChartInternal.prototype.generateColor = function() {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3,
    colors = config.data_colors,
    pattern = notEmpty(config.color_pattern)
      ? config.color_pattern
      : d3.schemeCategory10,
    callback = config.data_color,
    ids = [];

  return function(d) {
    var id = d.id || (d.data && d.data.id) || d,
      color;

    // if callback function is provided
    if (colors[id] instanceof Function) {
      color = colors[id](d);
    }
    // if specified, choose that color
    else if (colors[id]) {
      color = colors[id];
    }
    // if not specified, choose from pattern
    else {
      if (ids.indexOf(id) < 0) {
        ids.push(id);
      }
      color = pattern[ids.indexOf(id) % pattern.length];
      colors[id] = color;
    }
    return callback instanceof Function ? callback(color, d) : color
  }
};
ChartInternal.prototype.generateLevelColor = function() {
  var $$ = this,
    config = $$.config,
    colors = config.color_pattern,
    threshold = config.color_threshold,
    asValue = threshold.unit === 'value',
    values =
      threshold.values && threshold.values.length ? threshold.values : [],
    max = threshold.max || 100;
  return notEmpty(threshold) && notEmpty(colors)
    ? function(value) {
        var i,
          v,
          color = colors[colors.length - 1];
        for (i = 0; i < values.length; i++) {
          v = asValue ? value : (value * 100) / max;
          if (v < values[i]) {
            color = colors[i];
            break
          }
        }
        return color
      }
    : null
};

ChartInternal.prototype.getDefaultConfig = function() {
  var config = {
    bindto: '#chart',
    svg_classname: undefined,
    size_width: undefined,
    size_height: undefined,
    padding_left: undefined,
    padding_right: undefined,
    padding_top: undefined,
    padding_bottom: undefined,
    resize_auto: true,
    zoom_enabled: false,
    zoom_initialRange: undefined,
    zoom_type: 'scroll',
    zoom_disableDefaultBehavior: false,
    zoom_privileged: false,
    zoom_rescale: false,
    zoom_onzoom: function() {},
    zoom_onzoomstart: function() {},
    zoom_onzoomend: function() {},
    zoom_x_min: undefined,
    zoom_x_max: undefined,
    interaction_brighten: true,
    interaction_enabled: true,
    onmouseover: function() {},
    onmouseout: function() {},
    onresize: function() {},
    onresized: function() {},
    oninit: function() {},
    onrendered: function() {},
    transition_duration: 350,
    data_epochs: 'epochs',
    data_x: undefined,
    data_xs: {},
    data_xFormat: '%Y-%m-%d',
    data_xLocaltime: true,
    data_xSort: true,
    data_idConverter: function(id) {
      return id
    },
    data_names: {},
    data_classes: {},
    data_groups: [],
    data_axes: {},
    data_type: undefined,
    data_types: {},
    data_labels: {},
    data_order: 'desc',
    data_regions: {},
    data_color: undefined,
    data_colors: {},
    data_hide: false,
    data_filter: undefined,
    data_selection_enabled: false,
    data_selection_grouped: false,
    data_selection_isselectable: function() {
      return true
    },
    data_selection_multiple: true,
    data_selection_draggable: false,
    data_stack_normalize: false,
    data_onclick: function() {},
    data_onmouseover: function() {},
    data_onmouseout: function() {},
    data_onselected: function() {},
    data_onunselected: function() {},
    data_url: undefined,
    data_headers: undefined,
    data_json: undefined,
    data_rows: undefined,
    data_columns: undefined,
    data_mimeType: undefined,
    data_keys: undefined,
    // configuration for no plot-able data supplied.
    data_empty_label_text: '',
    // subchart
    subchart_show: false,
    subchart_size_height: 60,
    subchart_axis_x_show: true,
    subchart_onbrush: function() {},
    // color
    color_pattern: [],
    color_threshold: {},
    // legend
    legend_show: true,
    legend_hide: false,
    legend_position: 'bottom',
    legend_inset_anchor: 'top-left',
    legend_inset_x: 10,
    legend_inset_y: 0,
    legend_inset_step: undefined,
    legend_item_onclick: undefined,
    legend_item_onmouseover: undefined,
    legend_item_onmouseout: undefined,
    legend_equally: false,
    legend_padding: 0,
    legend_item_tile_width: 10,
    legend_item_tile_height: 10,
    // axis
    axis_rotated: false,
    axis_x_show: true,
    axis_x_type: 'indexed',
    axis_x_localtime: true,
    axis_x_categories: [],
    axis_x_tick_centered: false,
    axis_x_tick_format: undefined,
    axis_x_tick_culling: {},
    axis_x_tick_culling_max: 10,
    axis_x_tick_count: undefined,
    axis_x_tick_fit: true,
    axis_x_tick_values: null,
    axis_x_tick_rotate: 0,
    axis_x_tick_outer: true,
    axis_x_tick_multiline: true,
    axis_x_tick_multilineMax: 0,
    axis_x_tick_width: null,
    axis_x_max: undefined,
    axis_x_min: undefined,
    axis_x_padding: {},
    axis_x_height: undefined,
    axis_x_selection: undefined,
    axis_x_label: {},
    axis_x_inner: undefined,
    axis_y_show: true,
    axis_y_type: 'linear',
    axis_y_max: undefined,
    axis_y_min: undefined,
    axis_y_inverted: false,
    axis_y_center: undefined,
    axis_y_inner: undefined,
    axis_y_label: {},
    axis_y_tick_format: undefined,
    axis_y_tick_outer: true,
    axis_y_tick_values: null,
    axis_y_tick_rotate: 0,
    axis_y_tick_count: undefined,
    axis_y_tick_time_type: undefined,
    axis_y_tick_time_interval: undefined,
    axis_y_padding: {},
    axis_y_default: undefined,
    axis_y2_show: false,
    axis_y2_type: 'linear',
    axis_y2_max: undefined,
    axis_y2_min: undefined,
    axis_y2_inverted: false,
    axis_y2_center: undefined,
    axis_y2_inner: undefined,
    axis_y2_label: {},
    axis_y2_tick_format: undefined,
    axis_y2_tick_outer: true,
    axis_y2_tick_values: null,
    axis_y2_tick_count: undefined,
    axis_y2_padding: {},
    axis_y2_default: undefined,
    // grid
    grid_x_show: false,
    grid_x_type: 'tick',
    grid_x_lines: [],
    grid_y_show: false,
    // not used
    // grid_y_type: 'tick',
    grid_y_lines: [],
    grid_y_ticks: 10,
    grid_focus_show: true,
    grid_lines_front: true,
    // point - point of each data
    point_show: true,
    point_r: 2.5,
    point_sensitivity: 10,
    point_focus_expand_enabled: true,
    point_focus_expand_r: undefined,
    point_select_r: undefined,
    // line
    line_connectNull: false,
    line_step_type: 'step',
    // bar
    bar_width: undefined,
    bar_width_ratio: 0.6,
    bar_width_max: undefined,
    bar_zerobased: true,
    bar_space: 0,
    // area
    area_zerobased: true,
    area_above: false,
    // pie
    pie_label_show: true,
    pie_label_format: undefined,
    pie_label_threshold: 0.05,
    pie_label_ratio: undefined,
    pie_expand: {},
    pie_expand_duration: 50,
    pie_padAngle: 0,
    // gauge
    gauge_fullCircle: false,
    gauge_label_show: true,
    gauge_labelLine_show: true,
    gauge_label_format: undefined,
    gauge_min: 0,
    gauge_max: 100,
    gauge_startingAngle: (-1 * Math.PI) / 2,
    gauge_label_extents: undefined,
    gauge_units: undefined,
    gauge_width: undefined,
    gauge_arcs_minWidth: 5,
    gauge_expand: {},
    gauge_expand_duration: 50,
    // donut
    donut_label_show: true,
    donut_label_format: undefined,
    donut_label_threshold: 0.05,
    donut_label_ratio: undefined,
    donut_width: undefined,
    donut_title: '',
    donut_expand: {},
    donut_expand_duration: 50,
    donut_padAngle: 0,
    // spline
    spline_interpolation_type: 'cardinal',
    // stanford
    stanford_lines: [],
    stanford_regions: [],
    stanford_texts: [],
    stanford_scaleMin: undefined,
    stanford_scaleMax: undefined,
    stanford_scaleWidth: undefined,
    stanford_scaleFormat: undefined,
    stanford_scaleValues: undefined,
    stanford_colors: undefined,
    stanford_padding: {
      top: 0,
      right: 0,
      bottom: 0,
      left: 0
    },
    // region - region to change style
    regions: [],
    // tooltip - show when mouseover on each data
    tooltip_show: true,
    tooltip_grouped: true,
    tooltip_order: undefined,
    tooltip_format_title: undefined,
    tooltip_format_name: undefined,
    tooltip_format_value: undefined,
    tooltip_horizontal: undefined,
    tooltip_position: undefined,
    tooltip_contents: function(
      d,
      defaultTitleFormat,
      defaultValueFormat,
      color
    ) {
      return this.getTooltipContent
        ? this.getTooltipContent(
            d,
            defaultTitleFormat,
            defaultValueFormat,
            color
          )
        : ''
    },
    tooltip_init_show: false,
    tooltip_init_x: 0,
    tooltip_init_position: { top: '0px', left: '50px' },
    tooltip_onshow: function() {},
    tooltip_onhide: function() {},
    // title
    title_text: undefined,
    title_padding: {
      top: 0,
      right: 0,
      bottom: 0,
      left: 0
    },
    title_position: 'top-center'
  };

  Object.keys(this.additionalConfig).forEach(function(key) {
    config[key] = this.additionalConfig[key];
  }, this);

  return config
};
ChartInternal.prototype.additionalConfig = {};

ChartInternal.prototype.loadConfig = function(config) {
  var this_config = this.config,
    target,
    keys,
    read;
  function find() {
    var key = keys.shift();
    //        console.log("key =>", key, ", target =>", target);
    if (key && target && typeof target === 'object' && key in target) {
      target = target[key];
      return find()
    } else if (!key) {
      return target
    } else {
      return undefined
    }
  }
  Object.keys(this_config).forEach(function(key) {
    target = config;
    keys = key.split('_');
    read = find();
    //        console.log("CONFIG : ", key, read);
    if (isDefined(read)) {
      this_config[key] = read;
    }
  });
};

ChartInternal.prototype.convertUrlToData = function(
  url,
  mimeType,
  headers,
  keys,
  done
) {
  var $$ = this,
    type = mimeType ? mimeType : 'csv',
    f,
    converter;

  if (type === 'json') {
    f = $$.d3.json;
    converter = $$.convertJsonToData;
  } else if (type === 'tsv') {
    f = $$.d3.tsv;
    converter = $$.convertXsvToData;
  } else {
    f = $$.d3.csv;
    converter = $$.convertXsvToData;
  }

  f(url, headers)
    .then(function(data) {
      done.call($$, converter.call($$, data, keys));
    })
    .catch(function(error) {
      throw error
    });
};
ChartInternal.prototype.convertXsvToData = function(xsv) {
  var keys = xsv.columns,
    rows = xsv;
  if (rows.length === 0) {
    return {
      keys,
      rows: [keys.reduce((row, key) => Object.assign(row, { [key]: null }), {})]
    }
  } else {
    // [].concat() is to convert result into a plain array otherwise
    // test is not happy because rows have properties.
    return { keys, rows: [].concat(xsv) }
  }
};
ChartInternal.prototype.convertJsonToData = function(json, keys) {
  var $$ = this,
    new_rows = [],
    targetKeys,
    data;
  if (keys) {
    // when keys specified, json would be an array that includes objects
    if (keys.x) {
      targetKeys = keys.value.concat(keys.x);
      $$.config.data_x = keys.x;
    } else {
      targetKeys = keys.value;
    }
    new_rows.push(targetKeys);
    json.forEach(function(o) {
      var new_row = [];
      targetKeys.forEach(function(key) {
        // convert undefined to null because undefined data will be removed in convertDataToTargets()
        var v = $$.findValueInJson(o, key);
        if (isUndefined(v)) {
          v = null;
        }
        new_row.push(v);
      });
      new_rows.push(new_row);
    });
    data = $$.convertRowsToData(new_rows);
  } else {
    Object.keys(json).forEach(function(key) {
      new_rows.push([key].concat(json[key]));
    });
    data = $$.convertColumnsToData(new_rows);
  }
  return data
};
/**
 * Finds value from the given nested object by the given path.
 * If it's not found, then this returns undefined.
 * @param {Object} object the object
 * @param {string} path the path
 */
ChartInternal.prototype.findValueInJson = function(object, path) {
  if (path in object) {
    // If object has a key that contains . or [], return the key's value
    // instead of searching for an inner object.
    // See https://github.com/c3js/c3/issues/1691 for details.
    return object[path]
  }

  path = path.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties (replace [] with .)
  path = path.replace(/^\./, ''); // strip a leading dot
  var pathArray = path.split('.');
  for (var i = 0; i < pathArray.length; ++i) {
    var k = pathArray[i];
    if (k in object) {
      object = object[k];
    } else {
      return
    }
  }
  return object
};

/**
 * Converts the rows to normalized data.
 * @param {any[][]} rows The row data
 * @return {Object}
 */
ChartInternal.prototype.convertRowsToData = rows => {
  const newRows = [];
  const keys = rows[0];

  for (let i = 1; i < rows.length; i++) {
    const newRow = {};
    for (let j = 0; j < rows[i].length; j++) {
      if (isUndefined(rows[i][j])) {
        throw new Error(
          'Source data is missing a component at (' + i + ',' + j + ')!'
        )
      }
      newRow[keys[j]] = rows[i][j];
    }
    newRows.push(newRow);
  }
  return { keys, rows: newRows }
};

/**
 * Converts the columns to normalized data.
 * @param {any[][]} columns The column data
 * @return {Object}
 */
ChartInternal.prototype.convertColumnsToData = columns => {
  const newRows = [];
  const keys = [];

  for (let i = 0; i < columns.length; i++) {
    const key = columns[i][0];
    for (let j = 1; j < columns[i].length; j++) {
      if (isUndefined(newRows[j - 1])) {
        newRows[j - 1] = {};
      }
      if (isUndefined(columns[i][j])) {
        throw new Error(
          'Source data is missing a component at (' + i + ',' + j + ')!'
        )
      }
      newRows[j - 1][key] = columns[i][j];
    }
    keys.push(key);
  }

  return { keys, rows: newRows }
};

/**
 * Converts the data format into the target format.
 * @param {!Object} data
 * @param {!Array} data.keys Ordered list of target IDs.
 * @param {!Array} data.rows Rows of data to convert.
 * @param {boolean} appendXs True to append to $$.data.xs, False to replace.
 * @return {!Array}
 */
ChartInternal.prototype.convertDataToTargets = function(data, appendXs) {
  var $$ = this,
    config = $$.config,
    targets,
    ids,
    xs,
    keys,
    epochs;

  // handles format where keys are not orderly provided
  if (isArray(data)) {
    keys = Object.keys(data[0]);
  } else {
    keys = data.keys;
    data = data.rows;
  }

  xs = keys.filter($$.isX, $$);

  if (!$$.isStanfordGraphType()) {
    ids = keys.filter($$.isNotX, $$);
  } else {
    epochs = keys.filter($$.isEpochs, $$);
    ids = keys.filter($$.isNotXAndNotEpochs, $$);

    if (xs.length !== 1 || epochs.length !== 1 || ids.length !== 1) {
      throw new Error(
        "You must define the 'x' key name and the 'epochs' for Stanford Diagrams"
      )
    }
  }

  // save x for update data by load when custom x and c3.x API
  ids.forEach(function(id) {
    var xKey = $$.getXKey(id);

    if ($$.isCustomX() || $$.isTimeSeries()) {
      // if included in input data
      if (xs.indexOf(xKey) >= 0) {
        $$.data.xs[id] = (appendXs && $$.data.xs[id]
          ? $$.data.xs[id]
          : []
        ).concat(
          data
            .map(function(d) {
              return d[xKey]
            })
            .filter(isValue)
            .map(function(rawX, i) {
              return $$.generateTargetX(rawX, id, i)
            })
        );
      }
      // if not included in input data, find from preloaded data of other id's x
      else if (config.data_x) {
        $$.data.xs[id] = $$.getOtherTargetXs();
      }
      // if not included in input data, find from preloaded data
      else if (notEmpty(config.data_xs)) {
        $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
      }
      // MEMO: if no x included, use same x of current will be used
    } else {
      $$.data.xs[id] = data.map(function(d, i) {
        return i
      });
    }
  });

  // check x is defined
  ids.forEach(function(id) {
    if (!$$.data.xs[id]) {
      throw new Error('x is not defined for id = "' + id + '".')
    }
  });

  // convert to target
  targets = ids.map(function(id, index) {
    var convertedId = config.data_idConverter(id);
    return {
      id: convertedId,
      id_org: id,
      values: data
        .map(function(d, i) {
          var xKey = $$.getXKey(id),
            rawX = d[xKey],
            value = d[id] !== null && !isNaN(d[id]) ? +d[id] : null,
            x,
            returnData;
          // use x as categories if custom x and categorized
          if ($$.isCustomX() && $$.isCategorized() && !isUndefined(rawX)) {
            if (index === 0 && i === 0) {
              config.axis_x_categories = [];
            }
            x = config.axis_x_categories.indexOf(rawX);
            if (x === -1) {
              x = config.axis_x_categories.length;
              config.axis_x_categories.push(rawX);
            }
          } else {
            x = $$.generateTargetX(rawX, id, i);
          }
          // mark as x = undefined if value is undefined and filter to remove after mapped
          if (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
            x = undefined;
          }

          returnData = { x: x, value: value, id: convertedId };

          if ($$.isStanfordGraphType()) {
            returnData.epochs = d[epochs];
          }

          return returnData
        })
        .filter(function(v) {
          return isDefined(v.x)
        })
    }
  });

  // finish targets
  targets.forEach(function(t) {
    var i;
    // sort values by its x
    if (config.data_xSort) {
      t.values = t.values.sort(function(v1, v2) {
        var x1 = v1.x || v1.x === 0 ? v1.x : Infinity,
          x2 = v2.x || v2.x === 0 ? v2.x : Infinity;
        return x1 - x2
      });
    }
    // indexing each value
    i = 0;
    t.values.forEach(function(v) {
      v.index = i++;
    });
    // this needs to be sorted because its index and value.index is identical
    $$.data.xs[t.id].sort(function(v1, v2) {
      return v1 - v2
    });
  });

  // cache information about values
  $$.hasNegativeValue = $$.hasNegativeValueInTargets(targets);
  $$.hasPositiveValue = $$.hasPositiveValueInTargets(targets);

  // set target types
  if (config.data_type) {
    $$.setTargetType(
      $$.mapToIds(targets).filter(function(id) {
        return !(id in config.data_types)
      }),
      config.data_type
    );
  }

  // cache as original id keyed
  targets.forEach(function(d) {
    $$.addCache(d.id_org, d);
  });

  return targets
};

ChartInternal.prototype.isEpochs = function(key) {
  var $$ = this,
    config = $$.config;
  return config.data_epochs && key === config.data_epochs
};
ChartInternal.prototype.isX = function(key) {
  var $$ = this,
    config = $$.config;
  return (
    (config.data_x && key === config.data_x) ||
    (notEmpty(config.data_xs) && hasValue(config.data_xs, key))
  )
};
ChartInternal.prototype.isNotX = function(key) {
  return !this.isX(key)
};
ChartInternal.prototype.isNotXAndNotEpochs = function(key) {
  return !this.isX(key) && !this.isEpochs(key)
};

/**
 * Returns whether the normalized stack option is enabled or not.
 *
 * To be enabled it must also have data.groups defined.
 *
 * @return {boolean}
 */
ChartInternal.prototype.isStackNormalized = function() {
  return this.config.data_stack_normalize && this.config.data_groups.length > 0
};

/**
 * Returns whether the axis is normalized or not.
 *
 * An axis is normalized as long as one of its associated target
 * is normalized.
 *
 * @param axisId Axis ID (y or y2)
 * @return {Boolean}
 */
ChartInternal.prototype.isAxisNormalized = function(axisId) {
  const $$ = this;

  if (!$$.isStackNormalized()) {
    // shortcut
    return false
  }

  return $$.data.targets
    .filter(target => $$.axis.getId(target.id) === axisId)
    .some(target => $$.isTargetNormalized(target.id))
};

/**
 * Returns whether the values for this target ID is normalized or not.
 *
 * To be normalized the option needs to be enabled and target needs
 * to be defined in `data.groups`.
 *
 * @param targetId ID of the target
 * @return {Boolean} True if the target is normalized, false otherwise.
 */
ChartInternal.prototype.isTargetNormalized = function(targetId) {
  const $$ = this;

  return (
    $$.isStackNormalized() &&
    $$.config.data_groups.some(group => group.includes(targetId))
  )
};

ChartInternal.prototype.getXKey = function(id) {
  var $$ = this,
    config = $$.config;
  return config.data_x
    ? config.data_x
    : notEmpty(config.data_xs)
    ? config.data_xs[id]
    : null
};

/**
 * Get sum of visible data per index for given axis.
 *
 * Expect axisId to be either 'y' or 'y2'.
 *
 * @private
 * @param axisId Compute sum for data associated to given axis.
 * @return {Array}
 */
ChartInternal.prototype.getTotalPerIndex = function(axisId) {
  const $$ = this;

  if (!$$.isStackNormalized()) {
    return null
  }

  const cached = $$.getFromCache('getTotalPerIndex');
  if (cached !== undefined) {
    return cached[axisId]
  }

  const sum = { y: [], y2: [] };

  $$.data.targets
    // keep only target that are normalized
    .filter(target => $$.isTargetNormalized(target.id))

    // keep only target that are visible
    .filter(target => $$.isTargetToShow(target.id))

    // compute sum per axis
    .forEach(target => {
      const sumByAxis = sum[$$.axis.getId(target.id)];

      target.values.forEach((v, i) => {
        if (!sumByAxis[i]) {
          sumByAxis[i] = 0;
        }
        sumByAxis[i] += isNumber(v.value) ? v.value : 0;
      });
    });

  $$.addToCache('getTotalPerIndex', sum);

  return sum[axisId]
};

/**
 * Get sum of visible data.
 *
 * Should be used for normalised data only since all values
 * are expected to be positive.
 *
 * @private
 * @return {Number}
 */
ChartInternal.prototype.getTotalDataSum = function() {
  const $$ = this;

  const cached = $$.getFromCache('getTotalDataSum');
  if (cached !== undefined) {
    return cached
  }

  const totalDataSum = flattenArray(
    $$.data.targets
      .filter(target => $$.isTargetToShow(target.id))
      .map(target => target.values)
  )
    .map(d => d.value)
    .reduce((p, c) => p + c, 0);

  $$.addToCache('getTotalDataSum', totalDataSum);

  return totalDataSum
};

ChartInternal.prototype.getXValuesOfXKey = function(key, targets) {
  var $$ = this,
    xValues,
    ids = targets && notEmpty(targets) ? $$.mapToIds(targets) : [];
  ids.forEach(function(id) {
    if ($$.getXKey(id) === key) {
      xValues = $$.data.xs[id];
    }
  });
  return xValues
};
ChartInternal.prototype.getXValue = function(id, i) {
  var $$ = this;
  return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i])
    ? $$.data.xs[id][i]
    : i
};
ChartInternal.prototype.getOtherTargetXs = function() {
  var $$ = this,
    idsForX = Object.keys($$.data.xs);
  return idsForX.length ? $$.data.xs[idsForX[0]] : null
};
ChartInternal.prototype.getOtherTargetX = function(index) {
  var xs = this.getOtherTargetXs();
  return xs && index < xs.length ? xs[index] : null
};
ChartInternal.prototype.addXs = function(xs) {
  var $$ = this;
  Object.keys(xs).forEach(function(id) {
    $$.config.data_xs[id] = xs[id];
  });
};
ChartInternal.prototype.addName = function(data) {
  var $$ = this,
    name;
  if (data) {
    name = $$.config.data_names[data.id];
    data.name = name !== undefined ? name : data.id;
  }
  return data
};
ChartInternal.prototype.getValueOnIndex = function(values, index) {
  var valueOnIndex = values.filter(function(v) {
    return v.index === index
  });
  return valueOnIndex.length ? valueOnIndex[0] : null
};
ChartInternal.prototype.updateTargetX = function(targets, x) {
  var $$ = this;
  targets.forEach(function(t) {
    t.values.forEach(function(v, i) {
      v.x = $$.generateTargetX(x[i], t.id, i);
    });
    $$.data.xs[t.id] = x;
  });
};
ChartInternal.prototype.updateTargetXs = function(targets, xs) {
  var $$ = this;
  targets.forEach(function(t) {
    if (xs[t.id]) {
      $$.updateTargetX([t], xs[t.id]);
    }
  });
};
ChartInternal.prototype.generateTargetX = function(rawX, id, index) {
  var $$ = this,
    x;
  if ($$.isTimeSeries()) {
    x = rawX ? $$.parseDate(rawX) : $$.parseDate($$.getXValue(id, index));
  } else if ($$.isCustomX() && !$$.isCategorized()) {
    x = isValue(rawX) ? +rawX : $$.getXValue(id, index);
  } else {
    x = index;
  }
  return x
};
ChartInternal.prototype.cloneTarget = function(target) {
  return {
    id: target.id,
    id_org: target.id_org,
    values: target.values.map(function(d) {
      return {
        x: d.x,
        value: d.value,
        id: d.id
      }
    })
  }
};
ChartInternal.prototype.getMaxDataCount = function() {
  var $$ = this;
  return $$.d3.max($$.data.targets, function(t) {
    return t.values.length
  })
};
ChartInternal.prototype.mapToIds = function(targets) {
  return targets.map(function(d) {
    return d.id
  })
};
ChartInternal.prototype.mapToTargetIds = function(ids) {
  var $$ = this;
  return ids ? [].concat(ids) : $$.mapToIds($$.data.targets)
};
ChartInternal.prototype.hasTarget = function(targets, id) {
  var ids = this.mapToIds(targets),
    i;
  for (i = 0; i < ids.length; i++) {
    if (ids[i] === id) {
      return true
    }
  }
  return false
};
ChartInternal.prototype.isTargetToShow = function(targetId) {
  return this.hiddenTargetIds.indexOf(targetId) < 0
};
ChartInternal.prototype.isLegendToShow = function(targetId) {
  return this.hiddenLegendIds.indexOf(targetId) < 0
};

/**
 * Returns only visible targets.
 *
 * This is the same as calling {@link filterTargetsToShow} on $$.data.targets.
 *
 * @return {Array}
 */
ChartInternal.prototype.getTargetsToShow = function() {
  const $$ = this;
  return $$.filterTargetsToShow($$.data.targets)
};

ChartInternal.prototype.filterTargetsToShow = function(targets) {
  var $$ = this;
  return targets.filter(function(t) {
    return $$.isTargetToShow(t.id)
  })
};

/**
 * @return {Array} Returns all the targets attached to the chart, visible or not
 */
ChartInternal.prototype.getTargets = function() {
  const $$ = this;
  return $$.data.targets
};

ChartInternal.prototype.mapTargetsToUniqueXs = function(targets) {
  var $$ = this;
  var xs = $$.d3
    .set(
      $$.d3.merge(
        targets.map(function(t) {
          return t.values.map(function(v) {
            return +v.x
          })
        })
      )
    )
    .values();
  xs = $$.isTimeSeries()
    ? xs.map(function(x) {
        return new Date(+x)
      })
    : xs.map(function(x) {
        return +x
      });
  return xs.sort(function(a, b) {
    return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN
  })
};
ChartInternal.prototype.addHiddenTargetIds = function(targetIds) {
  targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
  for (var i = 0; i < targetIds.length; i++) {
    if (this.hiddenTargetIds.indexOf(targetIds[i]) < 0) {
      this.hiddenTargetIds = this.hiddenTargetIds.concat(targetIds[i]);
    }
  }
  this.resetCache();
};
ChartInternal.prototype.removeHiddenTargetIds = function(targetIds) {
  this.hiddenTargetIds = this.hiddenTargetIds.filter(function(id) {
    return targetIds.indexOf(id) < 0
  });
  this.resetCache();
};
ChartInternal.prototype.addHiddenLegendIds = function(targetIds) {
  targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
  for (var i = 0; i < targetIds.length; i++) {
    if (this.hiddenLegendIds.indexOf(targetIds[i]) < 0) {
      this.hiddenLegendIds = this.hiddenLegendIds.concat(targetIds[i]);
    }
  }
};
ChartInternal.prototype.removeHiddenLegendIds = function(targetIds) {
  this.hiddenLegendIds = this.hiddenLegendIds.filter(function(id) {
    return targetIds.indexOf(id) < 0
  });
};
ChartInternal.prototype.getValuesAsIdKeyed = function(targets) {
  var ys = {};
  targets.forEach(function(t) {
    ys[t.id] = [];
    t.values.forEach(function(v) {
      ys[t.id].push(v.value);
    });
  });
  return ys
};
ChartInternal.prototype.checkValueInTargets = function(targets, checker) {
  var ids = Object.keys(targets),
    i,
    j,
    values;
  for (i = 0; i < ids.length; i++) {
    values = targets[ids[i]].values;
    for (j = 0; j < values.length; j++) {
      if (checker(values[j].value)) {
        return true
      }
    }
  }
  return false
};
ChartInternal.prototype.hasNegativeValueInTargets = function(targets) {
  return this.checkValueInTargets(targets, function(v) {
    return v < 0
  })
};
ChartInternal.prototype.hasPositiveValueInTargets = function(targets) {
  return this.checkValueInTargets(targets, function(v) {
    return v > 0
  })
};
ChartInternal.prototype.isOrderDesc = function() {
  var config = this.config;
  return (
    typeof config.data_order === 'string' &&
    config.data_order.toLowerCase() === 'desc'
  )
};
ChartInternal.prototype.isOrderAsc = function() {
  var config = this.config;
  return (
    typeof config.data_order === 'string' &&
    config.data_order.toLowerCase() === 'asc'
  )
};
ChartInternal.prototype.getOrderFunction = function() {
  var $$ = this,
    config = $$.config,
    orderAsc = $$.isOrderAsc(),
    orderDesc = $$.isOrderDesc();
  if (orderAsc || orderDesc) {
    var reducer = function(p, c) {
      return p + Math.abs(c.value)
    };
    return function(t1, t2) {
      var t1Sum = t1.values.reduce(reducer, 0),
        t2Sum = t2.values.reduce(reducer, 0);
      return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum
    }
  } else if (isFunction(config.data_order)) {
    return config.data_order
  } else if (isArray(config.data_order)) {
    var order = config.data_order;
    return function(t1, t2) {
      return order.indexOf(t1.id) - order.indexOf(t2.id)
    }
  }
};
ChartInternal.prototype.orderTargets = function(targets) {
  var fct = this.getOrderFunction();
  if (fct) {
    targets.sort(fct);
  }
  return targets
};

/**
 * Returns all the values from the given targets at the given index.
 *
 * @param {Array} targets
 * @param {Number} index
 * @return {Array}
 */
ChartInternal.prototype.filterByIndex = function(targets, index) {
  return this.d3.merge(
    targets.map(t => t.values.filter(v => v.index === index))
  )
};

ChartInternal.prototype.filterByX = function(targets, x) {
  return this.d3
    .merge(
      targets.map(function(t) {
        return t.values
      })
    )
    .filter(function(v) {
      return v.x - x === 0
    })
};
ChartInternal.prototype.filterRemoveNull = function(data) {
  return data.filter(function(d) {
    return isValue(d.value)
  })
};
ChartInternal.prototype.filterByXDomain = function(targets, xDomain) {
  return targets.map(function(t) {
    return {
      id: t.id,
      id_org: t.id_org,
      values: t.values.filter(function(v) {
        return xDomain[0] <= v.x && v.x <= xDomain[1]
      })
    }
  })
};
ChartInternal.prototype.hasDataLabel = function() {
  var config = this.config;
  if (typeof config.data_labels === 'boolean' && config.data_labels) {
    return true
  } else if (
    typeof config.data_labels === 'object' &&
    notEmpty(config.data_labels)
  ) {
    return true
  }
  return false
};
ChartInternal.prototype.getDataLabelLength = function(min, max, key) {
  var $$ = this,
    lengths = [0, 0],
    paddingCoef = 1.3;
  $$.selectChart
    .select('svg')
    .selectAll('.dummy')
    .data([min, max])
    .enter()
    .append('text')
    .text(function(d) {
      return $$.dataLabelFormat(d.id)(d)
    })
    .each(function(d, i) {
      lengths[i] = getBBox(this)[key] * paddingCoef;
    })
    .remove();
  return lengths
};
/**
 * Returns true if the given data point is not arc type, otherwise false.
 * @param {Object} d The data point
 * @return {boolean}
 */
ChartInternal.prototype.isNoneArc = function(d) {
  return this.hasTarget(this.data.targets, d.id)
};

/**
 * Returns true if the given data point is arc type, otherwise false.
 * @param {Object} d The data point
 * @return {boolean}
 */
ChartInternal.prototype.isArc = function(d) {
  return 'data' in d && this.hasTarget(this.data.targets, d.data.id)
};

/**
 * Find the closest point from the given pos among the given targets or
 * undefined if none satisfies conditions.
 *
 * @param {Array} targets
 * @param {Array} pos An [x,y] coordinate
 * @return {Object|undefined}
 */
ChartInternal.prototype.findClosestFromTargets = function(targets, pos) {
  const $$ = this;

  // for each target, find the closest point
  const candidates = targets
    .map(t =>
      $$.findClosest(
        t.values,
        pos,
        $$.config.tooltip_horizontal
          ? $$.horizontalDistance.bind($$)
          : $$.dist.bind($$),
        $$.config.point_sensitivity
      )
    )
    .filter(v => v);

  // returns the closest of candidates
  if (candidates.length === 0) {
    return undefined
  } else if (candidates.length === 1) {
    return candidates[0]
  } else {
    return $$.findClosest(candidates, pos, $$.dist.bind($$))
  }
};

/**
 * Find the closest point from the x value or undefined if none satisfies conditions.
 *
 * @param {Array} targets
 * @param {Array} x A value on X axis
 * @return {Object|undefined}
 */
ChartInternal.prototype.findClosestFromTargetsByX = function(targets, x) {
  let closest;
  let diff;

  targets.forEach(t => {
    t.values.forEach(d => {
      let newDiff = Math.abs(x - d.x);

      if (diff === undefined || newDiff < diff) {
        closest = d;
        diff = newDiff;
      }
    });
  });

  return closest
};

/**
 * Using given compute distance method, returns the closest data point from the
 * given position.
 *
 * Giving optionally a minimum distance to satisfy.
 *
 * @param {Array} dataPoints List of DataPoints
 * @param {Array} pos An [x,y] coordinate
 * @param {Function} computeDist Function to compute distance between 2 points
 * @param {Number} minDist Minimal distance to satisfy
 * @return {Object|undefined} Closest data point
 */
ChartInternal.prototype.findClosest = function(
  dataPoints,
  pos,
  computeDist,
  minDist = Infinity
) {
  const $$ = this;

  let closest;

  // find closest bar
  dataPoints
    .filter(v => v && $$.isBarType(v.id))
    .forEach(function(v) {
      if (!closest) {
        const shape = $$.main
          .select(
            '.' +
              CLASS.bars +
              $$.getTargetSelectorSuffix(v.id) +
              ' .' +
              CLASS.bar +
              '-' +
              v.index
          )
          .node();
        if ($$.isWithinBar(pos, shape)) {
          closest = v;
        }
      }
    });

  // find closest point from non-bar
  dataPoints
    .filter(v => v && !$$.isBarType(v.id))
    .forEach(v => {
      let d = computeDist(v, pos);
      if (d < minDist) {
        minDist = d;
        closest = v;
      }
    });

  return closest
};
ChartInternal.prototype.dist = function(data, pos) {
  var $$ = this,
    config = $$.config,
    xIndex = config.axis_rotated ? 1 : 0,
    yIndex = config.axis_rotated ? 0 : 1,
    y = $$.circleY(data, data.index),
    x = $$.x(data.x);
  return Math.sqrt(Math.pow(x - pos[xIndex], 2) + Math.pow(y - pos[yIndex], 2))
};
ChartInternal.prototype.horizontalDistance = function(data, pos) {
  var $$ = this,
    config = $$.config,
    xIndex = config.axis_rotated ? 1 : 0,
    x = $$.x(data.x);

  return Math.abs(x - pos[xIndex])
};
ChartInternal.prototype.convertValuesToStep = function(values) {
  var converted = [].concat(values),
    i;

  if (!this.isCategorized()) {
    return values
  }

  for (i = values.length + 1; 0 < i; i--) {
    converted[i] = converted[i - 1];
  }

  converted[0] = {
    x: converted[0].x - 1,
    value: converted[0].value,
    id: converted[0].id
  };
  converted[values.length + 1] = {
    x: converted[values.length].x + 1,
    value: converted[values.length].value,
    id: converted[values.length].id
  };

  return converted
};

/**
 * Get ratio value
 *
 * @param {String} type Ratio for given type
 * @param {Object} d Data value object
 * @param {Boolean} asPercent Convert the return as percent or not
 * @return {Number} Ratio value
 * @private
 */
ChartInternal.prototype.getRatio = function(type, d, asPercent = false) {
  const $$ = this;
  const api = $$.api;
  let ratio = 0;

  if (d && api.data.shown.call(api).length) {
    ratio = d.ratio || d.value;

    if (type === 'arc') {
      if ($$.hasType('gauge')) {
        ratio =
          (d.endAngle - d.startAngle) /
          (Math.PI * ($$.config.gauge_fullCircle ? 2 : 1));
      } else {
        const total = $$.getTotalDataSum();

        ratio = d.value / total;
      }
    } else if (type === 'index') {
      const total = $$.getTotalPerIndex($$.axis.getId(d.id));

      d.ratio =
        isNumber(d.value) && total && total[d.index] > 0
          ? d.value / total[d.index]
          : 0;

      ratio = d.ratio;
    }
  }

  return asPercent && ratio ? ratio * 100 : ratio
};

ChartInternal.prototype.updateDataAttributes = function(name, attrs) {
  var $$ = this,
    config = $$.config,
    current = config['data_' + name];
  if (typeof attrs === 'undefined') {
    return current
  }
  Object.keys(attrs).forEach(function(id) {
    current[id] = attrs[id];
  });
  $$.redraw({
    withLegend: true
  });
  return current
};

ChartInternal.prototype.load = function(targets, args) {
  var $$ = this;
  if (targets) {
    // filter loading targets if needed
    if (args.filter) {
      targets = targets.filter(args.filter);
    }
    // set type if args.types || args.type specified
    if (args.type || args.types) {
      targets.forEach(function(t) {
        var type = args.types && args.types[t.id] ? args.types[t.id] : args.type;
        $$.setTargetType(t.id, type);
      });
    }
    // Update/Add data
    $$.data.targets.forEach(function(d) {
      for (var i = 0; i < targets.length; i++) {
        if (d.id === targets[i].id) {
          d.values = targets[i].values;
          targets.splice(i, 1);
          break
        }
      }
    });
    $$.data.targets = $$.data.targets.concat(targets); // add remained
  }

  // Set targets
  $$.updateTargets($$.data.targets);

  // Redraw with new targets
  $$.redraw({
    withUpdateOrgXDomain: true,
    withUpdateXDomain: true,
    withLegend: true
  });

  if (args.done) {
    args.done();
  }
};
ChartInternal.prototype.loadFromArgs = function(args) {
  var $$ = this;

  $$.resetCache();

  if (args.data) {
    $$.load($$.convertDataToTargets(args.data), args);
  } else if (args.url) {
    $$.convertUrlToData(
      args.url,
      args.mimeType,
      args.headers,
      args.keys,
      function(data) {
        $$.load($$.convertDataToTargets(data), args);
      }
    );
  } else if (args.json) {
    $$.load(
      $$.convertDataToTargets($$.convertJsonToData(args.json, args.keys)),
      args
    );
  } else if (args.rows) {
    $$.load($$.convertDataToTargets($$.convertRowsToData(args.rows)), args);
  } else if (args.columns) {
    $$.load(
      $$.convertDataToTargets($$.convertColumnsToData(args.columns)),
      args
    );
  } else {
    $$.load(null, args);
  }
};
ChartInternal.prototype.unload = function(targetIds, done) {
  var $$ = this;

  $$.resetCache();

  if (!done) {
    done = function() {};
  }
  // filter existing target
  targetIds = targetIds.filter(function(id) {
    return $$.hasTarget($$.data.targets, id)
  });
  // If no target, call done and return
  if (!targetIds || targetIds.length === 0) {
    done();
    return
  }
  $$.svg
    .selectAll(
      targetIds.map(function(id) {
        return $$.selectorTarget(id)
      })
    )
    .transition()
    .style('opacity', 0)
    .remove()
    .call($$.endall, done);
  targetIds.forEach(function(id) {
    // Reset fadein for future load
    $$.withoutFadeIn[id] = false;
    // Remove target's elements
    if ($$.legend) {
      $$.legend
        .selectAll('.' + CLASS.legendItem + $$.getTargetSelectorSuffix(id))
        .remove();
    }
    // Remove target
    $$.data.targets = $$.data.targets.filter(function(t) {
      return t.id !== id
    });
  });
};

ChartInternal.prototype.getYDomainMin = function(targets) {
  var $$ = this,
    config = $$.config,
    ids = $$.mapToIds(targets),
    ys = $$.getValuesAsIdKeyed(targets),
    j,
    k,
    baseId,
    idsInGroup,
    id,
    hasNegativeValue;
  if (config.data_groups.length > 0) {
    hasNegativeValue = $$.hasNegativeValueInTargets(targets);
    for (j = 0; j < config.data_groups.length; j++) {
      // Determine baseId
      idsInGroup = config.data_groups[j].filter(function(id) {
        return ids.indexOf(id) >= 0
      });
      if (idsInGroup.length === 0) {
        continue
      }
      baseId = idsInGroup[0];
      // Consider negative values
      if (hasNegativeValue && ys[baseId]) {
        ys[baseId].forEach(function(v, i) {
          ys[baseId][i] = v < 0 ? v : 0;
        });
      }
      // Compute min
      for (k = 1; k < idsInGroup.length; k++) {
        id = idsInGroup[k];
        if (!ys[id]) {
          continue
        }
        ys[id].forEach(function(v, i) {
          if (
            $$.axis.getId(id) === $$.axis.getId(baseId) &&
            ys[baseId] &&
            !(hasNegativeValue && +v > 0)
          ) {
            ys[baseId][i] += +v;
          }
        });
      }
    }
  }
  return $$.d3.min(
    Object.keys(ys).map(function(key) {
      return $$.d3.min(ys[key])
    })
  )
};
ChartInternal.prototype.getYDomainMax = function(targets) {
  var $$ = this,
    config = $$.config,
    ids = $$.mapToIds(targets),
    ys = $$.getValuesAsIdKeyed(targets),
    j,
    k,
    baseId,
    idsInGroup,
    id,
    hasPositiveValue;
  if (config.data_groups.length > 0) {
    hasPositiveValue = $$.hasPositiveValueInTargets(targets);
    for (j = 0; j < config.data_groups.length; j++) {
      // Determine baseId
      idsInGroup = config.data_groups[j].filter(function(id) {
        return ids.indexOf(id) >= 0
      });
      if (idsInGroup.length === 0) {
        continue
      }
      baseId = idsInGroup[0];
      // Consider positive values
      if (hasPositiveValue && ys[baseId]) {
        ys[baseId].forEach(function(v, i) {
          ys[baseId][i] = v > 0 ? v : 0;
        });
      }
      // Compute max
      for (k = 1; k < idsInGroup.length; k++) {
        id = idsInGroup[k];
        if (!ys[id]) {
          continue
        }
        ys[id].forEach(function(v, i) {
          if (
            $$.axis.getId(id) === $$.axis.getId(baseId) &&
            ys[baseId] &&
            !(hasPositiveValue && +v < 0)
          ) {
            ys[baseId][i] += +v;
          }
        });
      }
    }
  }
  return $$.d3.max(
    Object.keys(ys).map(function(key) {
      return $$.d3.max(ys[key])
    })
  )
};
ChartInternal.prototype.getYDomain = function(targets, axisId, xDomain) {
  var $$ = this,
    config = $$.config;

  if ($$.isAxisNormalized(axisId)) {
    return [0, 100]
  }

  var targetsByAxisId = targets.filter(function(t) {
      return $$.axis.getId(t.id) === axisId
    }),
    yTargets = xDomain
      ? $$.filterByXDomain(targetsByAxisId, xDomain)
      : targetsByAxisId,
    yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
    yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
    yDomainMin = $$.getYDomainMin(yTargets),
    yDomainMax = $$.getYDomainMax(yTargets),
    domain,
    domainLength,
    padding_top,
    padding_bottom,
    center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
    yDomainAbs,
    lengths,
    diff,
    ratio,
    isAllPositive,
    isAllNegative,
    isZeroBased =
      ($$.hasType('bar', yTargets) && config.bar_zerobased) ||
      ($$.hasType('area', yTargets) && config.area_zerobased),
    isInverted =
      axisId === 'y2' ? config.axis_y2_inverted : config.axis_y_inverted,
    showHorizontalDataLabel = $$.hasDataLabel() && config.axis_rotated,
    showVerticalDataLabel = $$.hasDataLabel() && !config.axis_rotated;

  // MEMO: avoid inverting domain unexpectedly
  yDomainMin = isValue(yMin)
    ? yMin
    : isValue(yMax)
    ? yDomainMin < yMax
      ? yDomainMin
      : yMax - 10
    : yDomainMin;
  yDomainMax = isValue(yMax)
    ? yMax
    : isValue(yMin)
    ? yMin < yDomainMax
      ? yDomainMax
      : yMin + 10
    : yDomainMax;

  if (yTargets.length === 0) {
    // use current domain if target of axisId is none
    return axisId === 'y2' ? $$.y2.domain() : $$.y.domain()
  }
  if (isNaN(yDomainMin)) {
    // set minimum to zero when not number
    yDomainMin = 0;
  }
  if (isNaN(yDomainMax)) {
    // set maximum to have same value as yDomainMin
    yDomainMax = yDomainMin;
  }
  if (yDomainMin === yDomainMax) {
    yDomainMin < 0 ? (yDomainMax = 0) : (yDomainMin = 0);
  }
  isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
  isAllNegative = yDomainMin <= 0 && yDomainMax <= 0;

  // Cancel zerobased if axis_*_min / axis_*_max specified
  if ((isValue(yMin) && isAllPositive) || (isValue(yMax) && isAllNegative)) {
    isZeroBased = false;
  }

  // Bar/Area chart should be 0-based if all positive|negative
  if (isZeroBased) {
    if (isAllPositive) {
      yDomainMin = 0;
    }
    if (isAllNegative) {
      yDomainMax = 0;
    }
  }

  domainLength = Math.abs(yDomainMax - yDomainMin);
  padding_top = padding_bottom = domainLength * 0.1;

  if (typeof center !== 'undefined') {
    yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
    yDomainMax = center + yDomainAbs;
    yDomainMin = center - yDomainAbs;
  }
  // add padding for data label
  if (showHorizontalDataLabel) {
    lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'width');
    diff = diffDomain($$.y.range());
    ratio = [lengths[0] / diff, lengths[1] / diff];
    padding_top += domainLength * (ratio[1] / (1 - ratio[0] - ratio[1]));
    padding_bottom += domainLength * (ratio[0] / (1 - ratio[0] - ratio[1]));
  } else if (showVerticalDataLabel) {
    lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'height');

    const pixelsToAxisPadding = $$.getY(
      config[`axis_${axisId}_type`],
      // input domain as pixels
      [0, config.axis_rotated ? $$.width : $$.height],
      // output range as axis padding
      [0, domainLength]
    );

    padding_top += pixelsToAxisPadding(lengths[1]);
    padding_bottom += pixelsToAxisPadding(lengths[0]);
  }
  if (axisId === 'y' && notEmpty(config.axis_y_padding)) {
    padding_top = $$.axis.getPadding(
      config.axis_y_padding,
      'top',
      padding_top,
      domainLength
    );
    padding_bottom = $$.axis.getPadding(
      config.axis_y_padding,
      'bottom',
      padding_bottom,
      domainLength
    );
  }
  if (axisId === 'y2' && notEmpty(config.axis_y2_padding)) {
    padding_top = $$.axis.getPadding(
      config.axis_y2_padding,
      'top',
      padding_top,
      domainLength
    );
    padding_bottom = $$.axis.getPadding(
      config.axis_y2_padding,
      'bottom',
      padding_bottom,
      domainLength
    );
  }
  // Bar/Area chart should be 0-based if all positive|negative
  if (isZeroBased) {
    if (isAllPositive) {
      padding_bottom = yDomainMin;
    }
    if (isAllNegative) {
      padding_top = -yDomainMax;
    }
  }
  domain = [yDomainMin - padding_bottom, yDomainMax + padding_top];
  return isInverted ? domain.reverse() : domain
};
ChartInternal.prototype.getXDomainMin = function(targets) {
  var $$ = this,
    config = $$.config;
  return isDefined(config.axis_x_min)
    ? $$.isTimeSeries()
      ? this.parseDate(config.axis_x_min)
      : config.axis_x_min
    : $$.d3.min(targets, function(t) {
        return $$.d3.min(t.values, function(v) {
          return v.x
        })
      })
};
ChartInternal.prototype.getXDomainMax = function(targets) {
  var $$ = this,
    config = $$.config;
  return isDefined(config.axis_x_max)
    ? $$.isTimeSeries()
      ? this.parseDate(config.axis_x_max)
      : config.axis_x_max
    : $$.d3.max(targets, function(t) {
        return $$.d3.max(t.values, function(v) {
          return v.x
        })
      })
};
ChartInternal.prototype.getXDomainPadding = function(domain) {
  var $$ = this,
    config = $$.config,
    diff = domain[1] - domain[0],
    maxDataCount,
    padding,
    paddingLeft,
    paddingRight;
  if ($$.isCategorized()) {
    padding = 0;
  } else if ($$.hasType('bar')) {
    maxDataCount = $$.getMaxDataCount();
    padding = maxDataCount > 1 ? diff / (maxDataCount - 1) / 2 : 0.5;
  } else {
    padding = diff * 0.01;
  }
  if (
    typeof config.axis_x_padding === 'object' &&
    notEmpty(config.axis_x_padding)
  ) {
    paddingLeft = isValue(config.axis_x_padding.left)
      ? config.axis_x_padding.left
      : padding;
    paddingRight = isValue(config.axis_x_padding.right)
      ? config.axis_x_padding.right
      : padding;
  } else if (typeof config.axis_x_padding === 'number') {
    paddingLeft = paddingRight = config.axis_x_padding;
  } else {
    paddingLeft = paddingRight = padding;
  }
  return { left: paddingLeft, right: paddingRight }
};
ChartInternal.prototype.getXDomain = function(targets) {
  var $$ = this,
    xDomain = [$$.getXDomainMin(targets), $$.getXDomainMax(targets)],
    firstX = xDomain[0],
    lastX = xDomain[1],
    padding = $$.getXDomainPadding(xDomain),
    min = 0,
    max = 0;
  // show center of x domain if min and max are the same
  if (firstX - lastX === 0 && !$$.isCategorized()) {
    if ($$.isTimeSeries()) {
      firstX = new Date(firstX.getTime() * 0.5);
      lastX = new Date(lastX.getTime() * 1.5);
    } else {
      firstX = firstX === 0 ? 1 : firstX * 0.5;
      lastX = lastX === 0 ? -1 : lastX * 1.5;
    }
  }
  if (firstX || firstX === 0) {
    min = $$.isTimeSeries()
      ? new Date(firstX.getTime() - padding.left)
      : firstX - padding.left;
  }
  if (lastX || lastX === 0) {
    max = $$.isTimeSeries()
      ? new Date(lastX.getTime() + padding.right)
      : lastX + padding.right;
  }
  return [min, max]
};
ChartInternal.prototype.updateXDomain = function(
  targets,
  withUpdateXDomain,
  withUpdateOrgXDomain,
  withTrim,
  domain
) {
  var $$ = this,
    config = $$.config;

  if (withUpdateOrgXDomain) {
    $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
    $$.orgXDomain = $$.x.domain();
    if (config.zoom_enabled) {
      $$.zoom.update();
    }
    $$.subX.domain($$.x.domain());
    if ($$.brush) {
      $$.brush.updateScale($$.subX);
    }
  }
  if (withUpdateXDomain) {
    $$.x.domain(
      domain
        ? domain
        : !$$.brush || $$.brush.empty()
        ? $$.orgXDomain
        : $$.brush.selectionAsValue()
    );
  }

  // Trim domain when too big by zoom mousemove event
  if (withTrim) {
    $$.x.domain($$.trimXDomain($$.x.orgDomain()));
  }

  return $$.x.domain()
};
ChartInternal.prototype.trimXDomain = function(domain) {
  var zoomDomain = this.getZoomDomain(),
    min = zoomDomain[0],
    max = zoomDomain[1];
  if (domain[0] <= min) {
    domain[1] = +domain[1] + (min - domain[0]);
    domain[0] = min;
  }
  if (max <= domain[1]) {
    domain[0] = +domain[0] - (domain[1] - max);
    domain[1] = max;
  }
  return domain
};

ChartInternal.prototype.drag = function(mouse) {
  var $$ = this,
    config = $$.config,
    main = $$.main,
    d3 = $$.d3;
  var sx, sy, mx, my, minX, maxX, minY, maxY;

  if ($$.hasArcType()) {
    return
  }
  if (!config.data_selection_enabled) {
    return
  } // do nothing if not selectable
  if (!config.data_selection_multiple) {
    return
  } // skip when single selection because drag is used for multiple selection

  sx = $$.dragStart[0];
  sy = $$.dragStart[1];
  mx = mouse[0];
  my = mouse[1];
  minX = Math.min(sx, mx);
  maxX = Math.max(sx, mx);
  minY = config.data_selection_grouped ? $$.margin.top : Math.min(sy, my);
  maxY = config.data_selection_grouped ? $$.height : Math.max(sy, my);

  main
    .select('.' + CLASS.dragarea)
    .attr('x', minX)
    .attr('y', minY)
    .attr('width', maxX - minX)
    .attr('height', maxY - minY);
  // TODO: binary search when multiple xs
  main
    .selectAll('.' + CLASS.shapes)
    .selectAll('.' + CLASS.shape)
    .each(function(d, i) {
      if (!config.data_selection_isselectable(d)) {
        return
      }
      var shape = d3.select(this),
        isSelected = shape.classed(CLASS.SELECTED),
        isIncluded = shape.classed(CLASS.INCLUDED),
        _x,
        _y,
        _w,
        _h,
        toggle,
        isWithin = false,
        box;
      if (shape.classed(CLASS.circle)) {
        _x = shape.attr('cx') * 1;
        _y = shape.attr('cy') * 1;
        toggle = $$.togglePoint;
        isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
      } else if (shape.classed(CLASS.bar)) {
        box = getPathBox(this);
        _x = box.x;
        _y = box.y;
        _w = box.width;
        _h = box.height;
        toggle = $$.togglePath;
        isWithin =
          !(maxX < _x || _x + _w < minX) && !(maxY < _y || _y + _h < minY);
      } else {
        // line/area selection not supported yet
        return
      }
      if (isWithin ^ isIncluded) {
        shape.classed(CLASS.INCLUDED, !isIncluded);
        // TODO: included/unincluded callback here
        shape.classed(CLASS.SELECTED, !isSelected);
        toggle.call($$, !isSelected, shape, d, i);
      }
    });
};

ChartInternal.prototype.dragstart = function(mouse) {
  var $$ = this,
    config = $$.config;
  if ($$.hasArcType()) {
    return
  }
  if (!config.data_selection_enabled) {
    return
  } // do nothing if not selectable
  $$.dragStart = mouse;
  $$.main
    .select('.' + CLASS.chart)
    .append('rect')
    .attr('class', CLASS.dragarea)
    .style('opacity', 0.1);
  $$.dragging = true;
};

ChartInternal.prototype.dragend = function() {
  var $$ = this,
    config = $$.config;
  if ($$.hasArcType()) {
    return
  }
  if (!config.data_selection_enabled) {
    return
  } // do nothing if not selectable
  $$.main
    .select('.' + CLASS.dragarea)
    .transition()
    .duration(100)
    .style('opacity', 0)
    .remove();
  $$.main.selectAll('.' + CLASS.shape).classed(CLASS.INCLUDED, false);
  $$.dragging = false;
};

ChartInternal.prototype.getYFormat = function(forArc) {
  var $$ = this,
    formatForY =
      forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
    formatForY2 =
      forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format;
  return function(v, ratio, id) {
    var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY;
    return format.call($$, v, ratio)
  }
};
ChartInternal.prototype.yFormat = function(v) {
  var $$ = this,
    config = $$.config,
    format = config.axis_y_tick_format
      ? config.axis_y_tick_format
      : $$.defaultValueFormat;
  return format(v)
};
ChartInternal.prototype.y2Format = function(v) {
  var $$ = this,
    config = $$.config,
    format = config.axis_y2_tick_format
      ? config.axis_y2_tick_format
      : $$.defaultValueFormat;
  return format(v)
};
ChartInternal.prototype.defaultValueFormat = function(v) {
  return isValue(v) ? +v : ''
};
ChartInternal.prototype.defaultArcValueFormat = function(v, ratio) {
  return (ratio * 100).toFixed(1) + '%'
};
ChartInternal.prototype.dataLabelFormat = function(targetId) {
  var $$ = this,
    data_labels = $$.config.data_labels,
    format,
    defaultFormat = function(v) {
      return isValue(v) ? +v : ''
    };
  // find format according to axis id
  if (typeof data_labels.format === 'function') {
    format = data_labels.format;
  } else if (typeof data_labels.format === 'object') {
    if (data_labels.format[targetId]) {
      format =
        data_labels.format[targetId] === true
          ? defaultFormat
          : data_labels.format[targetId];
    } else {
      format = function() {
        return ''
      };
    }
  } else {
    format = defaultFormat;
  }
  return format
};

ChartInternal.prototype.initGrid = function() {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3;
  $$.grid = $$.main
    .append('g')
    .attr('clip-path', $$.clipPathForGrid)
    .attr('class', CLASS.grid);
  if (config.grid_x_show) {
    $$.grid.append('g').attr('class', CLASS.xgrids);
  }
  if (config.grid_y_show) {
    $$.grid.append('g').attr('class', CLASS.ygrids);
  }
  if (config.grid_focus_show) {
    $$.grid
      .append('g')
      .attr('class', CLASS.xgridFocus)
      .append('line')
      .attr('class', CLASS.xgridFocus);
  }
  $$.xgrid = d3.selectAll([]);
  if (!config.grid_lines_front) {
    $$.initGridLines();
  }
};
ChartInternal.prototype.initGridLines = function() {
  var $$ = this,
    d3 = $$.d3;
  $$.gridLines = $$.main
    .append('g')
    .attr('clip-path', $$.clipPathForGrid)
    .attr('class', CLASS.grid + ' ' + CLASS.gridLines);
  $$.gridLines.append('g').attr('class', CLASS.xgridLines);
  $$.gridLines.append('g').attr('class', CLASS.ygridLines);
  $$.xgridLines = d3.selectAll([]);
};
ChartInternal.prototype.updateXGrid = function(withoutUpdate) {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3,
    xgridData = $$.generateGridData(config.grid_x_type, $$.x),
    tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;

  $$.xgridAttr = config.axis_rotated
    ? {
        x1: 0,
        x2: $$.width,
        y1: function(d) {
          return $$.x(d) - tickOffset
        },
        y2: function(d) {
          return $$.x(d) - tickOffset
        }
      }
    : {
        x1: function(d) {
          return $$.x(d) + tickOffset
        },
        x2: function(d) {
          return $$.x(d) + tickOffset
        },
        y1: 0,
        y2: $$.height
      };
  $$.xgridAttr.opacity = function() {
    var pos = +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1');
    return pos === (config.axis_rotated ? $$.height : 0) ? 0 : 1
  };

  var xgrid = $$.main
    .select('.' + CLASS.xgrids)
    .selectAll('.' + CLASS.xgrid)
    .data(xgridData);
  var xgridEnter = xgrid
    .enter()
    .append('line')
    .attr('class', CLASS.xgrid)
    .attr('x1', $$.xgridAttr.x1)
    .attr('x2', $$.xgridAttr.x2)
    .attr('y1', $$.xgridAttr.y1)
    .attr('y2', $$.xgridAttr.y2)
    .style('opacity', 0);
  $$.xgrid = xgridEnter.merge(xgrid);
  if (!withoutUpdate) {
    $$.xgrid
      .attr('x1', $$.xgridAttr.x1)
      .attr('x2', $$.xgridAttr.x2)
      .attr('y1', $$.xgridAttr.y1)
      .attr('y2', $$.xgridAttr.y2)
      .style('opacity', $$.xgridAttr.opacity);
  }
  xgrid.exit().remove();
};

ChartInternal.prototype.updateYGrid = function() {
  var $$ = this,
    config = $$.config,
    gridValues = $$.yAxis.tickValues() || $$.y.ticks(config.grid_y_ticks);
  var ygrid = $$.main
    .select('.' + CLASS.ygrids)
    .selectAll('.' + CLASS.ygrid)
    .data(gridValues);
  var ygridEnter = ygrid
    .enter()
    .append('line')
    // TODO: x1, x2, y1, y2, opacity need to be set here maybe
    .attr('class', CLASS.ygrid);
  $$.ygrid = ygridEnter.merge(ygrid);
  $$.ygrid
    .attr('x1', config.axis_rotated ? $$.y : 0)
    .attr('x2', config.axis_rotated ? $$.y : $$.width)
    .attr('y1', config.axis_rotated ? 0 : $$.y)
    .attr('y2', config.axis_rotated ? $$.height : $$.y);
  ygrid.exit().remove();
  $$.smoothLines($$.ygrid, 'grid');
};

ChartInternal.prototype.gridTextAnchor = function(d) {
  return d.position ? d.position : 'end'
};
ChartInternal.prototype.gridTextDx = function(d) {
  return d.position === 'start' ? 4 : d.position === 'middle' ? 0 : -4
};
ChartInternal.prototype.xGridTextX = function(d) {
  return d.position === 'start'
    ? -this.height
    : d.position === 'middle'
    ? -this.height / 2
    : 0
};
ChartInternal.prototype.yGridTextX = function(d) {
  return d.position === 'start'
    ? 0
    : d.position === 'middle'
    ? this.width / 2
    : this.width
};
ChartInternal.prototype.updateGrid = function(duration) {
  var $$ = this,
    main = $$.main,
    config = $$.config,
    xgridLine,
    xgridLineEnter,
    ygridLine,
    ygridLineEnter,
    xv = $$.xv.bind($$),
    yv = $$.yv.bind($$),
    xGridTextX = $$.xGridTextX.bind($$),
    yGridTextX = $$.yGridTextX.bind($$);

  // hide if arc type
  $$.grid.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');

  main.select('line.' + CLASS.xgridFocus).style('visibility', 'hidden');
  if (config.grid_x_show) {
    $$.updateXGrid();
  }
  xgridLine = main
    .select('.' + CLASS.xgridLines)
    .selectAll('.' + CLASS.xgridLine)
    .data(config.grid_x_lines);
  // enter
  xgridLineEnter = xgridLine
    .enter()
    .append('g')
    .attr('class', function(d) {
      return CLASS.xgridLine + (d['class'] ? ' ' + d['class'] : '')
    });
  xgridLineEnter
    .append('line')
    .attr('x1', config.axis_rotated ? 0 : xv)
    .attr('x2', config.axis_rotated ? $$.width : xv)
    .attr('y1', config.axis_rotated ? xv : 0)
    .attr('y2', config.axis_rotated ? xv : $$.height)
    .style('opacity', 0);
  xgridLineEnter
    .append('text')
    .attr('text-anchor', $$.gridTextAnchor)
    .attr('transform', config.axis_rotated ? '' : 'rotate(-90)')
    .attr('x', config.axis_rotated ? yGridTextX : xGridTextX)
    .attr('y', xv)
    .attr('dx', $$.gridTextDx)
    .attr('dy', -5)
    .style('opacity', 0);
  // udpate
  $$.xgridLines = xgridLineEnter.merge(xgridLine);
  // done in d3.transition() of the end of this function
  // exit
  xgridLine
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();

  // Y-Grid
  if (config.grid_y_show) {
    $$.updateYGrid();
  }
  ygridLine = main
    .select('.' + CLASS.ygridLines)
    .selectAll('.' + CLASS.ygridLine)
    .data(config.grid_y_lines);
  // enter
  ygridLineEnter = ygridLine
    .enter()
    .append('g')
    .attr('class', function(d) {
      return CLASS.ygridLine + (d['class'] ? ' ' + d['class'] : '')
    });
  ygridLineEnter
    .append('line')
    .attr('x1', config.axis_rotated ? yv : 0)
    .attr('x2', config.axis_rotated ? yv : $$.width)
    .attr('y1', config.axis_rotated ? 0 : yv)
    .attr('y2', config.axis_rotated ? $$.height : yv)
    .style('opacity', 0);
  ygridLineEnter
    .append('text')
    .attr('text-anchor', $$.gridTextAnchor)
    .attr('transform', config.axis_rotated ? 'rotate(-90)' : '')
    .attr('x', config.axis_rotated ? xGridTextX : yGridTextX)
    .attr('y', yv)
    .attr('dx', $$.gridTextDx)
    .attr('dy', -5)
    .style('opacity', 0);
  // update
  $$.ygridLines = ygridLineEnter.merge(ygridLine);
  $$.ygridLines
    .select('line')
    .transition()
    .duration(duration)
    .attr('x1', config.axis_rotated ? yv : 0)
    .attr('x2', config.axis_rotated ? yv : $$.width)
    .attr('y1', config.axis_rotated ? 0 : yv)
    .attr('y2', config.axis_rotated ? $$.height : yv)
    .style('opacity', 1);
  $$.ygridLines
    .select('text')
    .transition()
    .duration(duration)
    .attr(
      'x',
      config.axis_rotated ? $$.xGridTextX.bind($$) : $$.yGridTextX.bind($$)
    )
    .attr('y', yv)
    .text(function(d) {
      return d.text
    })
    .style('opacity', 1);
  // exit
  ygridLine
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();
};
ChartInternal.prototype.redrawGrid = function(withTransition, transition) {
  var $$ = this,
    config = $$.config,
    xv = $$.xv.bind($$),
    lines = $$.xgridLines.select('line'),
    texts = $$.xgridLines.select('text');
  return [
    (withTransition ? lines.transition(transition) : lines)
      .attr('x1', config.axis_rotated ? 0 : xv)
      .attr('x2', config.axis_rotated ? $$.width : xv)
      .attr('y1', config.axis_rotated ? xv : 0)
      .attr('y2', config.axis_rotated ? xv : $$.height)
      .style('opacity', 1),
    (withTransition ? texts.transition(transition) : texts)
      .attr(
        'x',
        config.axis_rotated ? $$.yGridTextX.bind($$) : $$.xGridTextX.bind($$)
      )
      .attr('y', xv)
      .text(function(d) {
        return d.text
      })
      .style('opacity', 1)
  ]
};
ChartInternal.prototype.showXGridFocus = function(selectedData) {
  var $$ = this,
    config = $$.config,
    dataToShow = selectedData.filter(function(d) {
      return d && isValue(d.value)
    }),
    focusEl = $$.main.selectAll('line.' + CLASS.xgridFocus),
    xx = $$.xx.bind($$);
  if (!config.tooltip_show) {
    return
  }
  // Hide when stanford plot exists
  if ($$.hasType('stanford') || $$.hasArcType()) {
    return
  }
  focusEl
    .style('visibility', 'visible')
    .data([dataToShow[0]])
    .attr(config.axis_rotated ? 'y1' : 'x1', xx)
    .attr(config.axis_rotated ? 'y2' : 'x2', xx);
  $$.smoothLines(focusEl, 'grid');
};
ChartInternal.prototype.hideXGridFocus = function() {
  this.main.select('line.' + CLASS.xgridFocus).style('visibility', 'hidden');
};
ChartInternal.prototype.updateXgridFocus = function() {
  var $$ = this,
    config = $$.config;
  $$.main
    .select('line.' + CLASS.xgridFocus)
    .attr('x1', config.axis_rotated ? 0 : -10)
    .attr('x2', config.axis_rotated ? $$.width : -10)
    .attr('y1', config.axis_rotated ? -10 : 0)
    .attr('y2', config.axis_rotated ? -10 : $$.height);
};
ChartInternal.prototype.generateGridData = function(type, scale) {
  var $$ = this,
    gridData = [],
    xDomain,
    firstYear,
    lastYear,
    i,
    tickNum = $$.main
      .select('.' + CLASS.axisX)
      .selectAll('.tick')
      .size();
  if (type === 'year') {
    xDomain = $$.getXDomain();
    firstYear = xDomain[0].getFullYear();
    lastYear = xDomain[1].getFullYear();
    for (i = firstYear; i <= lastYear; i++) {
      gridData.push(new Date(i + '-01-01 00:00:00'));
    }
  } else {
    gridData = scale.ticks(10);
    if (gridData.length > tickNum) {
      // use only int
      gridData = gridData.filter(function(d) {
        return ('' + d).indexOf('.') < 0
      });
    }
  }
  return gridData
};
ChartInternal.prototype.getGridFilterToRemove = function(params) {
  return params
    ? function(line) {
        var found = false
        ;[].concat(params).forEach(function(param) {
          if (
            ('value' in param && line.value === param.value) ||
            ('class' in param && line['class'] === param['class'])
          ) {
            found = true;
          }
        });
        return found
      }
    : function() {
        return true
      }
};
ChartInternal.prototype.removeGridLines = function(params, forX) {
  var $$ = this,
    config = $$.config,
    toRemove = $$.getGridFilterToRemove(params),
    toShow = function(line) {
      return !toRemove(line)
    },
    classLines = forX ? CLASS.xgridLines : CLASS.ygridLines,
    classLine = forX ? CLASS.xgridLine : CLASS.ygridLine;
  $$.main
    .select('.' + classLines)
    .selectAll('.' + classLine)
    .filter(toRemove)
    .transition()
    .duration(config.transition_duration)
    .style('opacity', 0)
    .remove();
  if (forX) {
    config.grid_x_lines = config.grid_x_lines.filter(toShow);
  } else {
    config.grid_y_lines = config.grid_y_lines.filter(toShow);
  }
};

ChartInternal.prototype.initEventRect = function() {
  var $$ = this,
    config = $$.config;

  $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.eventRects)
    .style('fill-opacity', 0);
  $$.eventRect = $$.main
    .select('.' + CLASS.eventRects)
    .append('rect')
    .attr('class', CLASS.eventRect);

  // event rect handle zoom event as well
  if (config.zoom_enabled && $$.zoom) {
    $$.eventRect.call($$.zoom).on('dblclick.zoom', null);
    if (config.zoom_initialRange) {
      // WORKAROUND: Add transition to apply transform immediately when no subchart
      $$.eventRect
        .transition()
        .duration(0)
        .call($$.zoom.transform, $$.zoomTransform(config.zoom_initialRange));
    }
  }
};
ChartInternal.prototype.redrawEventRect = function() {
  const $$ = this,
    d3 = $$.d3,
    config = $$.config;

  function mouseout() {
    $$.svg.select('.' + CLASS.eventRect).style('cursor', null);
    $$.hideXGridFocus();
    $$.hideTooltip();
    $$.unexpandCircles();
    $$.unexpandBars();
  }

  const isHoveringDataPoint = (mouse, closest) =>
    closest &&
    ($$.isBarType(closest.id) ||
      $$.dist(closest, mouse) < config.point_sensitivity);

  const withName = d => (d ? $$.addName(Object.assign({}, d)) : null);

  // rects for mouseover
  $$.main
    .select('.' + CLASS.eventRects)
    .style(
      'cursor',
      config.zoom_enabled
        ? config.axis_rotated
          ? 'ns-resize'
          : 'ew-resize'
        : null
    );

  $$.eventRect
    .attr('x', 0)
    .attr('y', 0)
    .attr('width', $$.width)
    .attr('height', $$.height)
    .on(
      'mouseout',
      config.interaction_enabled
        ? function() {
            if (!config) {
              return
            } // chart is destroyed
            if ($$.hasArcType()) {
              return
            }
            if ($$.mouseover) {
              config.data_onmouseout.call($$.api, $$.mouseover);
              $$.mouseover = undefined;
            }
            mouseout();
          }
        : null
    )
    .on(
      'mousemove',
      config.interaction_enabled
        ? function() {
            // do nothing when dragging
            if ($$.dragging) {
              return
            }

            const targetsToShow = $$.getTargetsToShow();

            // do nothing if arc type
            if ($$.hasArcType(targetsToShow)) {
              return
            }

            const mouse = d3.mouse(this);
            const closest = withName(
              $$.findClosestFromTargets(targetsToShow, mouse)
            );
            const isMouseCloseToDataPoint = isHoveringDataPoint(mouse, closest);

            // ensure onmouseout is always called if mousemove switch between 2 targets
            if (
              $$.mouseover &&
              (!closest ||
                closest.id !== $$.mouseover.id ||
                closest.index !== $$.mouseover.index)
            ) {
              config.data_onmouseout.call($$.api, $$.mouseover);
              $$.mouseover = undefined;
            }
            if (closest && !$$.mouseover) {
              config.data_onmouseover.call($$.api, closest);
              $$.mouseover = closest;
            }

            // show cursor as pointer if we're hovering a data point close enough
            $$.svg
              .select('.' + CLASS.eventRect)
              .style('cursor', isMouseCloseToDataPoint ? 'pointer' : null);

            // if tooltip not grouped, we want to display only data from closest data point
            const showSingleDataPoint =
              !config.tooltip_grouped || $$.hasType('stanford', targetsToShow);

            // find data to highlight
            let selectedData;
            if (showSingleDataPoint) {
              if (closest) {
                selectedData = [closest];
              }
            } else {
              let closestByX;
              if (closest) {
                // reuse closest value
                closestByX = closest;
              } else {
                // try to find the closest value by X values from the mouse position
                const mouseX = config.axis_rotated ? mouse[1] : mouse[0];
                closestByX = $$.findClosestFromTargetsByX(
                  targetsToShow,
                  $$.x.invert(mouseX)
                );
              }

              // highlight all data for this 'x' value
              if (closestByX) {
                selectedData = $$.filterByX(targetsToShow, closestByX.x);
              }
            }

            // ensure we have data to show
            if (!selectedData || selectedData.length === 0) {
              return mouseout()
            }

            // inject names for each point
            selectedData = selectedData.map(withName);

            // show tooltip
            $$.showTooltip(selectedData, this);

            // expand points
            if (config.point_focus_expand_enabled) {
              $$.unexpandCircles();
              selectedData.forEach(function(d) {
                $$.expandCircles(d.index, d.id, false);
              });
            }

            // expand bars
            $$.unexpandBars();
            selectedData.forEach(function(d) {
              $$.expandBars(d.index, d.id, false);
            });

            // Show xgrid focus line
            $$.showXGridFocus(selectedData);
          }
        : null
    )
    .on(
      'click',
      config.interaction_enabled
        ? function() {
            const targetsToShow = $$.getTargetsToShow();

            if ($$.hasArcType(targetsToShow)) {
              return
            }

            const mouse = d3.mouse(this);
            const closest = withName(
              $$.findClosestFromTargets(targetsToShow, mouse)
            );

            if (!isHoveringDataPoint(mouse, closest)) {
              return
            }

            // select if selection enabled
            let sameXData;
            if (!config.data_selection_grouped || $$.isStanfordType(closest)) {
              sameXData = [closest];
            } else {
              sameXData = $$.filterByX(targetsToShow, closest.x);
            }

            // toggle selected state
            sameXData.forEach(function(d) {
              $$.main
                .selectAll(
                  '.' + CLASS.shapes + $$.getTargetSelectorSuffix(d.id)
                )
                .selectAll('.' + CLASS.shape + '-' + d.index)
                .each(function() {
                  if (
                    config.data_selection_grouped ||
                    $$.isWithinShape(this, d)
                  ) {
                    $$.toggleShape(this, d, d.index);
                  }
                });
            });

            // call data_onclick on the closest data point
            if (closest) {
              const shape = $$.main
                .selectAll(
                  '.' + CLASS.shapes + $$.getTargetSelectorSuffix(closest.id)
                )
                .select('.' + CLASS.shape + '-' + closest.index);
              config.data_onclick.call($$.api, closest, shape.node());
            }
          }
        : null
    )
    .call(
      config.interaction_enabled && config.data_selection_draggable && $$.drag
        ? d3
            .drag()
            .on('drag', function() {
              $$.drag(d3.mouse(this));
            })
            .on('start', function() {
              $$.dragstart(d3.mouse(this));
            })
            .on('end', function() {
              $$.dragend();
            })
        : function() {}
    );
};
ChartInternal.prototype.getMousePosition = function(data) {
  var $$ = this;
  return [$$.x(data.x), $$.getYScale(data.id)(data.value)]
};
ChartInternal.prototype.dispatchEvent = function(type, mouse) {
  var $$ = this,
    selector = '.' + CLASS.eventRect,
    eventRect = $$.main.select(selector).node(),
    box = eventRect.getBoundingClientRect(),
    x = box.left + (mouse ? mouse[0] : 0),
    y = box.top + (mouse ? mouse[1] : 0),
    event = document.createEvent('MouseEvents');

  event.initMouseEvent(
    type,
    true,
    true,
    window,
    0,
    x,
    y,
    x,
    y,
    false,
    false,
    false,
    false,
    0,
    null
  );
  eventRect.dispatchEvent(event);
};

ChartInternal.prototype.initLegend = function() {
  var $$ = this;
  $$.legendItemTextBox = {};
  $$.legendHasRendered = false;
  $$.legend = $$.svg.append('g').attr('transform', $$.getTranslate('legend'));
  if (!$$.config.legend_show) {
    $$.legend.style('visibility', 'hidden');
    $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
    return
  }
  // MEMO: call here to update legend box and tranlate for all
  // MEMO: translate will be updated by this, so transform not needed in updateLegend()
  $$.updateLegendWithDefaults();
};
ChartInternal.prototype.updateLegendWithDefaults = function() {
  var $$ = this;
  $$.updateLegend($$.mapToIds($$.data.targets), {
    withTransform: false,
    withTransitionForTransform: false,
    withTransition: false
  });
};
ChartInternal.prototype.updateSizeForLegend = function(
  legendHeight,
  legendWidth
) {
  var $$ = this,
    config = $$.config,
    insetLegendPosition = {
      top: $$.isLegendTop
        ? $$.getCurrentPaddingTop() + config.legend_inset_y + 5.5
        : $$.currentHeight -
          legendHeight -
          $$.getCurrentPaddingBottom() -
          config.legend_inset_y,
      left: $$.isLegendLeft
        ? $$.getCurrentPaddingLeft() + config.legend_inset_x + 0.5
        : $$.currentWidth -
          legendWidth -
          $$.getCurrentPaddingRight() -
          config.legend_inset_x +
          0.5
    };

  $$.margin3 = {
    top: $$.isLegendRight
      ? 0
      : $$.isLegendInset
      ? insetLegendPosition.top
      : $$.currentHeight - legendHeight,
    right: NaN,
    bottom: 0,
    left: $$.isLegendRight
      ? $$.currentWidth - legendWidth
      : $$.isLegendInset
      ? insetLegendPosition.left
      : 0
  };
};
ChartInternal.prototype.transformLegend = function(withTransition) {
  var $$ = this
  ;(withTransition ? $$.legend.transition() : $$.legend).attr(
    'transform',
    $$.getTranslate('legend')
  );
};
ChartInternal.prototype.updateLegendStep = function(step) {
  this.legendStep = step;
};
ChartInternal.prototype.updateLegendItemWidth = function(w) {
  this.legendItemWidth = w;
};
ChartInternal.prototype.updateLegendItemHeight = function(h) {
  this.legendItemHeight = h;
};
ChartInternal.prototype.getLegendWidth = function() {
  var $$ = this;
  return $$.config.legend_show
    ? $$.isLegendRight || $$.isLegendInset
      ? $$.legendItemWidth * ($$.legendStep + 1)
      : $$.currentWidth
    : 0
};
ChartInternal.prototype.getLegendHeight = function() {
  var $$ = this,
    h = 0;
  if ($$.config.legend_show) {
    if ($$.isLegendRight) {
      h = $$.currentHeight;
    } else {
      h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
    }
  }
  return h
};
ChartInternal.prototype.opacityForLegend = function(legendItem) {
  return legendItem.classed(CLASS.legendItemHidden) ? null : 1
};
ChartInternal.prototype.opacityForUnfocusedLegend = function(legendItem) {
  return legendItem.classed(CLASS.legendItemHidden) ? null : 0.3
};
ChartInternal.prototype.toggleFocusLegend = function(targetIds, focus) {
  var $$ = this;
  targetIds = $$.mapToTargetIds(targetIds);
  $$.legend
    .selectAll('.' + CLASS.legendItem)
    .filter(function(id) {
      return targetIds.indexOf(id) >= 0
    })
    .classed(CLASS.legendItemFocused, focus)
    .transition()
    .duration(100)
    .style('opacity', function() {
      var opacity = focus ? $$.opacityForLegend : $$.opacityForUnfocusedLegend;
      return opacity.call($$, $$.d3.select(this))
    });
};
ChartInternal.prototype.revertLegend = function() {
  var $$ = this,
    d3 = $$.d3;
  $$.legend
    .selectAll('.' + CLASS.legendItem)
    .classed(CLASS.legendItemFocused, false)
    .transition()
    .duration(100)
    .style('opacity', function() {
      return $$.opacityForLegend(d3.select(this))
    });
};
ChartInternal.prototype.showLegend = function(targetIds) {
  var $$ = this,
    config = $$.config;
  if (!config.legend_show) {
    config.legend_show = true;
    $$.legend.style('visibility', 'visible');
    if (!$$.legendHasRendered) {
      $$.updateLegendWithDefaults();
    }
  }
  $$.removeHiddenLegendIds(targetIds);
  $$.legend
    .selectAll($$.selectorLegends(targetIds))
    .style('visibility', 'visible')
    .transition()
    .style('opacity', function() {
      return $$.opacityForLegend($$.d3.select(this))
    });
};
ChartInternal.prototype.hideLegend = function(targetIds) {
  var $$ = this,
    config = $$.config;
  if (config.legend_show && isEmpty(targetIds)) {
    config.legend_show = false;
    $$.legend.style('visibility', 'hidden');
  }
  $$.addHiddenLegendIds(targetIds);
  $$.legend
    .selectAll($$.selectorLegends(targetIds))
    .style('opacity', 0)
    .style('visibility', 'hidden');
};
ChartInternal.prototype.clearLegendItemTextBoxCache = function() {
  this.legendItemTextBox = {};
};
ChartInternal.prototype.updateLegend = function(
  targetIds,
  options,
  transitions
) {
  var $$ = this,
    config = $$.config;
  var xForLegend,
    xForLegendText,
    xForLegendRect,
    yForLegend,
    yForLegendText,
    yForLegendRect,
    x1ForLegendTile,
    x2ForLegendTile,
    yForLegendTile;
  var paddingTop = 4,
    paddingRight = 10,
    maxWidth = 0,
    maxHeight = 0,
    posMin = 10,
    tileWidth = config.legend_item_tile_width + 5;
  var l,
    totalLength = 0,
    offsets = {},
    widths = {},
    heights = {},
    margins = [0],
    steps = {},
    step = 0;
  var withTransition, withTransitionForTransform;
  var texts, rects, tiles, background;

  // Skip elements when their name is set to null
  targetIds = targetIds.filter(function(id) {
    return !isDefined(config.data_names[id]) || config.data_names[id] !== null
  });

  options = options || {};
  withTransition = getOption(options, 'withTransition', true);
  withTransitionForTransform = getOption(
    options,
    'withTransitionForTransform',
    true
  );

  function getTextBox(textElement, id) {
    if (!$$.legendItemTextBox[id]) {
      $$.legendItemTextBox[id] = $$.getTextRect(
        textElement.textContent,
        CLASS.legendItem,
        textElement
      );
    }
    return $$.legendItemTextBox[id]
  }

  function updatePositions(textElement, id, index) {
    var reset = index === 0,
      isLast = index === targetIds.length - 1,
      box = getTextBox(textElement, id),
      itemWidth =
        box.width +
        tileWidth +
        (isLast && !($$.isLegendRight || $$.isLegendInset) ? 0 : paddingRight) +
        config.legend_padding,
      itemHeight = box.height + paddingTop,
      itemLength =
        $$.isLegendRight || $$.isLegendInset ? itemHeight : itemWidth,
      areaLength =
        $$.isLegendRight || $$.isLegendInset
          ? $$.getLegendHeight()
          : $$.getLegendWidth(),
      margin,
      maxLength;

    // MEMO: care about condifion of step, totalLength
    function updateValues(id, withoutStep) {
      if (!withoutStep) {
        margin = (areaLength - totalLength - itemLength) / 2;
        if (margin < posMin) {
          margin = (areaLength - itemLength) / 2;
          totalLength = 0;
          step++;
        }
      }
      steps[id] = step;
      margins[step] = $$.isLegendInset ? 10 : margin;
      offsets[id] = totalLength;
      totalLength += itemLength;
    }

    if (reset) {
      totalLength = 0;
      step = 0;
      maxWidth = 0;
      maxHeight = 0;
    }

    if (config.legend_show && !$$.isLegendToShow(id)) {
      widths[id] = heights[id] = steps[id] = offsets[id] = 0;
      return
    }

    widths[id] = itemWidth;
    heights[id] = itemHeight;

    if (!maxWidth || itemWidth >= maxWidth) {
      maxWidth = itemWidth;
    }
    if (!maxHeight || itemHeight >= maxHeight) {
      maxHeight = itemHeight;
    }
    maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;

    if (config.legend_equally) {
      Object.keys(widths).forEach(function(id) {
        widths[id] = maxWidth;
      });
      Object.keys(heights).forEach(function(id) {
        heights[id] = maxHeight;
      });
      margin = (areaLength - maxLength * targetIds.length) / 2;
      if (margin < posMin) {
        totalLength = 0;
        step = 0;
        targetIds.forEach(function(id) {
          updateValues(id);
        });
      } else {
        updateValues(id, true);
      }
    } else {
      updateValues(id);
    }
  }

  if ($$.isLegendInset) {
    step = config.legend_inset_step
      ? config.legend_inset_step
      : targetIds.length;
    $$.updateLegendStep(step);
  }

  if ($$.isLegendRight) {
    xForLegend = function(id) {
      return maxWidth * steps[id]
    };
    yForLegend = function(id) {
      return margins[steps[id]] + offsets[id]
    };
  } else if ($$.isLegendInset) {
    xForLegend = function(id) {
      return maxWidth * steps[id] + 10
    };
    yForLegend = function(id) {
      return margins[steps[id]] + offsets[id]
    };
  } else {
    xForLegend = function(id) {
      return margins[steps[id]] + offsets[id]
    };
    yForLegend = function(id) {
      return maxHeight * steps[id]
    };
  }
  xForLegendText = function(id, i) {
    return xForLegend(id, i) + 4 + config.legend_item_tile_width
  };
  yForLegendText = function(id, i) {
    return yForLegend(id, i) + 9
  };
  xForLegendRect = function(id, i) {
    return xForLegend(id, i)
  };
  yForLegendRect = function(id, i) {
    return yForLegend(id, i) - 5
  };
  x1ForLegendTile = function(id, i) {
    return xForLegend(id, i) - 2
  };
  x2ForLegendTile = function(id, i) {
    return xForLegend(id, i) - 2 + config.legend_item_tile_width
  };
  yForLegendTile = function(id, i) {
    return yForLegend(id, i) + 4
  };

  // Define g for legend area
  l = $$.legend
    .selectAll('.' + CLASS.legendItem)
    .data(targetIds)
    .enter()
    .append('g')
    .attr('class', function(id) {
      return $$.generateClass(CLASS.legendItem, id)
    })
    .style('visibility', function(id) {
      return $$.isLegendToShow(id) ? 'visible' : 'hidden'
    })
    .style('cursor', function() {
      return config.interaction_enabled ? 'pointer' : 'auto'
    })
    .on(
      'click',
      config.interaction_enabled
        ? function(id) {
            if (config.legend_item_onclick) {
              config.legend_item_onclick.call($$, id);
            } else {
              if ($$.d3.event.altKey) {
                $$.api.hide();
                $$.api.show(id);
              } else {
                $$.api.toggle(id);
                $$.isTargetToShow(id) ? $$.api.focus(id) : $$.api.revert();
              }
            }
          }
        : null
    )
    .on(
      'mouseover',
      config.interaction_enabled
        ? function(id) {
            if (config.legend_item_onmouseover) {
              config.legend_item_onmouseover.call($$, id);
            } else {
              $$.d3.select(this).classed(CLASS.legendItemFocused, true);
              if (!$$.transiting && $$.isTargetToShow(id)) {
                $$.api.focus(id);
              }
            }
          }
        : null
    )
    .on(
      'mouseout',
      config.interaction_enabled
        ? function(id) {
            if (config.legend_item_onmouseout) {
              config.legend_item_onmouseout.call($$, id);
            } else {
              $$.d3.select(this).classed(CLASS.legendItemFocused, false);
              $$.api.revert();
            }
          }
        : null
    );

  l.append('text')
    .text(function(id) {
      return isDefined(config.data_names[id]) ? config.data_names[id] : id
    })
    .each(function(id, i) {
      updatePositions(this, id, i);
    })
    .style('pointer-events', 'none')
    .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200)
    .attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendText);

  l.append('rect')
    .attr('class', CLASS.legendItemEvent)
    .style('fill-opacity', 0)
    .attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendRect : -200)
    .attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendRect);

  l.append('line')
    .attr('class', CLASS.legendItemTile)
    .style('stroke', $$.color)
    .style('pointer-events', 'none')
    .attr('x1', $$.isLegendRight || $$.isLegendInset ? x1ForLegendTile : -200)
    .attr('y1', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile)
    .attr('x2', $$.isLegendRight || $$.isLegendInset ? x2ForLegendTile : -200)
    .attr('y2', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile)
    .attr('stroke-width', config.legend_item_tile_height);

  // Set background for inset legend
  background = $$.legend.select('.' + CLASS.legendBackground + ' rect');
  if ($$.isLegendInset && maxWidth > 0 && background.size() === 0) {
    background = $$.legend
      .insert('g', '.' + CLASS.legendItem)
      .attr('class', CLASS.legendBackground)
      .append('rect');
  }

  texts = $$.legend
    .selectAll('text')
    .data(targetIds)
    .text(function(id) {
      return isDefined(config.data_names[id]) ? config.data_names[id] : id
    }) // MEMO: needed for update
    .each(function(id, i) {
      updatePositions(this, id, i);
    })
  ;(withTransition ? texts.transition() : texts)
    .attr('x', xForLegendText)
    .attr('y', yForLegendText);

  rects = $$.legend.selectAll('rect.' + CLASS.legendItemEvent).data(targetIds)
  ;(withTransition ? rects.transition() : rects)
    .attr('width', function(id) {
      return widths[id]
    })
    .attr('height', function(id) {
      return heights[id]
    })
    .attr('x', xForLegendRect)
    .attr('y', yForLegendRect);

  tiles = $$.legend.selectAll('line.' + CLASS.legendItemTile).data(targetIds)
  ;(withTransition ? tiles.transition() : tiles)
    .style(
      'stroke',
      $$.levelColor
        ? function(id) {
            return $$.levelColor(
              $$.cache[id].values.reduce(function(total, item) {
                return total + item.value
              }, 0)
            )
          }
        : $$.color
    )
    .attr('x1', x1ForLegendTile)
    .attr('y1', yForLegendTile)
    .attr('x2', x2ForLegendTile)
    .attr('y2', yForLegendTile);

  if (background) {
(withTransition ? background.transition() : background)
      .attr('height', $$.getLegendHeight() - 12)
      .attr('width', maxWidth * (step + 1) + 10);
  }

  // toggle legend state
  $$.legend
    .selectAll('.' + CLASS.legendItem)
    .classed(CLASS.legendItemHidden, function(id) {
      return !$$.isTargetToShow(id)
    });

  // Update all to reflect change of legend
  $$.updateLegendItemWidth(maxWidth);
  $$.updateLegendItemHeight(maxHeight);
  $$.updateLegendStep(step);
  // Update size and scale
  $$.updateSizes();
  $$.updateScales();
  $$.updateSvgSize();
  // Update g positions
  $$.transformAll(withTransitionForTransform, transitions);
  $$.legendHasRendered = true;
};

ChartInternal.prototype.initRegion = function() {
  var $$ = this;
  $$.region = $$.main
    .append('g')
    .attr('clip-path', $$.clipPath)
    .attr('class', CLASS.regions);
};
ChartInternal.prototype.updateRegion = function(duration) {
  var $$ = this,
    config = $$.config;

  // hide if arc type
  $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');

  var mainRegion = $$.main
    .select('.' + CLASS.regions)
    .selectAll('.' + CLASS.region)
    .data(config.regions);
  var g = mainRegion.enter().append('g');
  g.append('rect')
    .attr('x', $$.regionX.bind($$))
    .attr('y', $$.regionY.bind($$))
    .attr('width', $$.regionWidth.bind($$))
    .attr('height', $$.regionHeight.bind($$))
    .style('fill-opacity', function(d) {
      return isValue(d.opacity) ? d.opacity : 0.1
    });
  g.append('text').text($$.labelRegion.bind($$));
  $$.mainRegion = g.merge(mainRegion).attr('class', $$.classRegion.bind($$));
  mainRegion
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();
};
ChartInternal.prototype.redrawRegion = function(withTransition, transition) {
  var $$ = this,
    regions = $$.mainRegion,
    regionLabels = $$.mainRegion.selectAll('text');
  return [
    (withTransition ? regions.transition(transition) : regions)
      .attr('x', $$.regionX.bind($$))
      .attr('y', $$.regionY.bind($$))
      .attr('width', $$.regionWidth.bind($$))
      .attr('height', $$.regionHeight.bind($$))
      .style('fill-opacity', function(d) {
        return isValue(d.opacity) ? d.opacity : 0.1
      }),
    (withTransition ? regionLabels.transition(transition) : regionLabels)
      .attr('x', $$.labelOffsetX.bind($$))
      .attr('y', $$.labelOffsetY.bind($$))
      .attr('transform', $$.labelTransform.bind($$))
      .attr('style', 'text-anchor: left;')
  ]
};
ChartInternal.prototype.regionX = function(d) {
  var $$ = this,
    config = $$.config,
    xPos,
    yScale = d.axis === 'y' ? $$.y : $$.y2;
  if (d.axis === 'y' || d.axis === 'y2') {
    xPos = config.axis_rotated ? ('start' in d ? yScale(d.start) : 0) : 0;
  } else {
    xPos = config.axis_rotated
      ? 0
      : 'start' in d
      ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start)
      : 0;
  }
  return xPos
};
ChartInternal.prototype.regionY = function(d) {
  var $$ = this,
    config = $$.config,
    yPos,
    yScale = d.axis === 'y' ? $$.y : $$.y2;
  if (d.axis === 'y' || d.axis === 'y2') {
    yPos = config.axis_rotated ? 0 : 'end' in d ? yScale(d.end) : 0;
  } else {
    yPos = config.axis_rotated
      ? 'start' in d
        ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start)
        : 0
      : 0;
  }
  return yPos
};
ChartInternal.prototype.regionWidth = function(d) {
  var $$ = this,
    config = $$.config,
    start = $$.regionX(d),
    end,
    yScale = d.axis === 'y' ? $$.y : $$.y2;
  if (d.axis === 'y' || d.axis === 'y2') {
    end = config.axis_rotated
      ? 'end' in d
        ? yScale(d.end)
        : $$.width
      : $$.width;
  } else {
    end = config.axis_rotated
      ? $$.width
      : 'end' in d
      ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end)
      : $$.width;
  }
  return end < start ? 0 : end - start
};
ChartInternal.prototype.regionHeight = function(d) {
  var $$ = this,
    config = $$.config,
    start = this.regionY(d),
    end,
    yScale = d.axis === 'y' ? $$.y : $$.y2;
  if (d.axis === 'y' || d.axis === 'y2') {
    end = config.axis_rotated
      ? $$.height
      : 'start' in d
      ? yScale(d.start)
      : $$.height;
  } else {
    end = config.axis_rotated
      ? 'end' in d
        ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end)
        : $$.height
      : $$.height;
  }
  return end < start ? 0 : end - start
};
ChartInternal.prototype.isRegionOnX = function(d) {
  return !d.axis || d.axis === 'x'
};
ChartInternal.prototype.labelRegion = function(d) {
  return 'label' in d ? d.label : ''
};
ChartInternal.prototype.labelTransform = function(d) {
  return 'vertical' in d && d.vertical ? 'rotate(90)' : ''
};
ChartInternal.prototype.labelOffsetX = function(d) {
  var paddingX = 'paddingX' in d ? d.paddingX : 3;
  var paddingY = 'paddingY' in d ? d.paddingY : 3;
  return 'vertical' in d && d.vertical
    ? this.regionY(d) + paddingY
    : this.regionX(d) + paddingX
};
ChartInternal.prototype.labelOffsetY = function(d) {
  var paddingX = 'paddingX' in d ? d.paddingX : 3;
  var paddingY = 'paddingY' in d ? d.paddingY : 3;
  return 'vertical' in d && d.vertical
    ? -(this.regionX(d) + paddingX)
    : this.regionY(d) + 10 + paddingY
};

function c3LogScale(d3, linearScale, logScale) {
  var PROJECTION = [0.01, 10];

  if (!linearScale) {
    linearScale = d3.scaleLinear();
    linearScale.range(PROJECTION);
  }

  if (!logScale) {
    logScale = d3.scaleLog();
    logScale.domain(PROJECTION);
    logScale.nice();
  }

  // copied from https://github.com/compute-io/logspace
  function logspace(a, b, len) {
    var arr, end, tmp, d;

    if (arguments.length < 3) {
      len = 10;
    } else {
      if (len === 0) {
        return []
      }
    }
    // Calculate the increment:
    end = len - 1;
    d = (b - a) / end;

    // Build the output array...
    arr = new Array(len);
    tmp = a;
    arr[0] = Math.pow(10, tmp);
    for (var i = 1; i < end; i++) {
      tmp += d;
      arr[i] = Math.pow(10, tmp);
    }
    arr[end] = Math.pow(10, b);
    return arr
  }

  function scale(x) {
    return logScale(linearScale(x))
  }

  scale.domain = function(x) {
    if (!arguments.length) {
      return linearScale.domain()
    }
    linearScale.domain(x);
    return scale
  };

  scale.range = function(x) {
    if (!arguments.length) {
      return logScale.range()
    }
    logScale.range(x);
    return scale
  };

  scale.ticks = function(m) {
    return logspace(-2, 1, m || 10).map(function(v) {
      return linearScale.invert(v)
    })
  };

  scale.copy = function() {
    return c3LogScale(d3, linearScale.copy(), logScale.copy())
  };

  return scale
}

ChartInternal.prototype.getScale = function(min, max, forTimeseries) {
  return (forTimeseries ? this.d3.scaleTime() : this.d3.scaleLinear()).range([
    min,
    max
  ])
};
ChartInternal.prototype.getX = function(min, max, domain, offset) {
  var $$ = this,
    scale = $$.getScale(min, max, $$.isTimeSeries()),
    _scale = domain ? scale.domain(domain) : scale,
    key;
  // Define customized scale if categorized axis
  if ($$.isCategorized()) {
    offset =
      offset ||
      function() {
        return 0
      };
    scale = function(d, raw) {
      var v = _scale(d) + offset(d);
      return raw ? v : Math.ceil(v)
    };
  } else {
    scale = function(d, raw) {
      var v = _scale(d);
      return raw ? v : Math.ceil(v)
    };
  }
  // define functions
  for (key in _scale) {
    scale[key] = _scale[key];
  }
  scale.orgDomain = function() {
    return _scale.domain()
  };
  // define custom domain() for categorized axis
  if ($$.isCategorized()) {
    scale.domain = function(domain) {
      if (!arguments.length) {
        domain = this.orgDomain();
        return [domain[0], domain[1] + 1]
      }
      _scale.domain(domain);
      return scale
    };
  }
  return scale
};

/**
 * Creates and configures a D3 scale instance for the given type.
 *
 * By defaults it returns a Linear scale.
 *
 * @param {String} type Type of d3-scale to create. Type can be 'linear', 'time', 'timeseries' or 'log'.
 * @param {Array} domain The scale domain such as [from, to]
 * @param {Array} range The scale's range such as [from, to]
 *
 * @return A d3-scale instance
 */
ChartInternal.prototype.getY = function(type, domain, range) {
  let scale;
  if (type === 'timeseries' || type === 'time') {
    scale = this.d3.scaleTime();
  } else if (type === 'log') {
    scale = c3LogScale(this.d3);
  } else if (type === 'linear' || type === undefined) {
    scale = this.d3.scaleLinear();
  } else {
    throw new Error(`Invalid Y axis type: "${type}"`)
  }

  if (domain) {
    scale.domain(domain);
  }

  if (range) {
    scale.range(range);
  }

  return scale
};
ChartInternal.prototype.getYScale = function(id) {
  return this.axis.getId(id) === 'y2' ? this.y2 : this.y
};
ChartInternal.prototype.getSubYScale = function(id) {
  return this.axis.getId(id) === 'y2' ? this.subY2 : this.subY
};
ChartInternal.prototype.updateScales = function() {
  var $$ = this,
    config = $$.config,
    forInit = !$$.x;
  // update edges
  $$.xMin = config.axis_rotated ? 1 : 0;
  $$.xMax = config.axis_rotated ? $$.height : $$.width;
  $$.yMin = config.axis_rotated ? 0 : $$.height;
  $$.yMax = config.axis_rotated ? $$.width : 1;
  $$.subXMin = $$.xMin;
  $$.subXMax = $$.xMax;
  $$.subYMin = config.axis_rotated ? 0 : $$.height2;
  $$.subYMax = config.axis_rotated ? $$.width2 : 1;
  // update scales
  $$.x = $$.getX(
    $$.xMin,
    $$.xMax,
    forInit ? undefined : $$.x.orgDomain(),
    function() {
      return $$.xAxis.tickOffset()
    }
  );
  $$.y = $$.getY(
    config.axis_y_type,
    forInit ? config.axis_y_default : $$.y.domain(),
    [$$.yMin, $$.yMax]
  );
  $$.y2 = $$.getY(
    config.axis_y2_type,
    forInit ? config.axis_y2_default : $$.y2.domain(),
    [$$.yMin, $$.yMax]
  );
  $$.subX = $$.getX($$.xMin, $$.xMax, $$.orgXDomain, function(d) {
    return d % 1 ? 0 : $$.subXAxis.tickOffset()
  });
  $$.subY = $$.getY(
    config.axis_y_type,
    forInit ? config.axis_y_default : $$.subY.domain(),
    [$$.subYMin, $$.subYMax]
  );
  $$.subY2 = $$.getY(
    config.axis_y2_type,
    forInit ? config.axis_y2_default : $$.subY2.domain(),
    [$$.subYMin, $$.subYMax]
  );
  // update axes
  $$.xAxisTickFormat = $$.axis.getXAxisTickFormat();
  $$.xAxisTickValues = $$.axis.getXAxisTickValues();
  $$.yAxisTickValues = $$.axis.getYAxisTickValues();
  $$.y2AxisTickValues = $$.axis.getY2AxisTickValues();

  $$.xAxis = $$.axis.getXAxis(
    $$.x,
    $$.xOrient,
    $$.xAxisTickFormat,
    $$.xAxisTickValues,
    config.axis_x_tick_outer
  );
  $$.subXAxis = $$.axis.getXAxis(
    $$.subX,
    $$.subXOrient,
    $$.xAxisTickFormat,
    $$.xAxisTickValues,
    config.axis_x_tick_outer
  );
  $$.yAxis = $$.axis.getYAxis(
    'y',
    $$.y,
    $$.yOrient,
    $$.yAxisTickValues,
    config.axis_y_tick_outer
  );
  $$.y2Axis = $$.axis.getYAxis(
    'y2',
    $$.y2,
    $$.y2Orient,
    $$.y2AxisTickValues,
    config.axis_y2_tick_outer
  );

  // Set initialized scales to brush and zoom
  if (!forInit) {
    if ($$.brush) {
      $$.brush.updateScale($$.subX);
    }
  }
  // update for arc
  if ($$.updateArc) {
    $$.updateArc();
  }
};

ChartInternal.prototype.selectPoint = function(target, d, i) {
  var $$ = this,
    config = $$.config,
    cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
    cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
    r = $$.pointSelectR.bind($$);
  config.data_onselected.call($$.api, d, target.node());
  // add selected-circle on low layer g
  $$.main
    .select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id))
    .selectAll('.' + CLASS.selectedCircle + '-' + i)
    .data([d])
    .enter()
    .append('circle')
    .attr('class', function() {
      return $$.generateClass(CLASS.selectedCircle, i)
    })
    .attr('cx', cx)
    .attr('cy', cy)
    .attr('stroke', function() {
      return $$.color(d)
    })
    .attr('r', function(d) {
      return $$.pointSelectR(d) * 1.4
    })
    .transition()
    .duration(100)
    .attr('r', r);
};
ChartInternal.prototype.unselectPoint = function(target, d, i) {
  var $$ = this;
  $$.config.data_onunselected.call($$.api, d, target.node());
  // remove selected-circle from low layer g
  $$.main
    .select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id))
    .selectAll('.' + CLASS.selectedCircle + '-' + i)
    .transition()
    .duration(100)
    .attr('r', 0)
    .remove();
};
ChartInternal.prototype.togglePoint = function(selected, target, d, i) {
  selected ? this.selectPoint(target, d, i) : this.unselectPoint(target, d, i);
};
ChartInternal.prototype.selectPath = function(target, d) {
  var $$ = this;
  $$.config.data_onselected.call($$, d, target.node());
  if ($$.config.interaction_brighten) {
    target
      .transition()
      .duration(100)
      .style('fill', function() {
        return $$.d3.rgb($$.color(d)).brighter(0.75)
      });
  }
};
ChartInternal.prototype.unselectPath = function(target, d) {
  var $$ = this;
  $$.config.data_onunselected.call($$, d, target.node());
  if ($$.config.interaction_brighten) {
    target
      .transition()
      .duration(100)
      .style('fill', function() {
        return $$.color(d)
      });
  }
};
ChartInternal.prototype.togglePath = function(selected, target, d, i) {
  selected ? this.selectPath(target, d, i) : this.unselectPath(target, d, i);
};
ChartInternal.prototype.getToggle = function(that, d) {
  var $$ = this,
    toggle;
  if (that.nodeName === 'circle') {
    if ($$.isStepType(d)) {
      // circle is hidden in step chart, so treat as within the click area
      toggle = function() {}; // TODO: how to select step chart?
    } else {
      toggle = $$.togglePoint;
    }
  } else if (that.nodeName === 'path') {
    toggle = $$.togglePath;
  }
  return toggle
};
ChartInternal.prototype.toggleShape = function(that, d, i) {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    shape = d3.select(that),
    isSelected = shape.classed(CLASS.SELECTED),
    toggle = $$.getToggle(that, d).bind($$);

  if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
    if (!config.data_selection_multiple) {
      $$.main
        .selectAll(
          '.' +
            CLASS.shapes +
            (config.data_selection_grouped
              ? $$.getTargetSelectorSuffix(d.id)
              : '')
        )
        .selectAll('.' + CLASS.shape)
        .each(function(d, i) {
          var shape = d3.select(this);
          if (shape.classed(CLASS.SELECTED)) {
            toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
          }
        });
    }
    shape.classed(CLASS.SELECTED, !isSelected);
    toggle(!isSelected, shape, d, i);
  }
};

ChartInternal.prototype.initBar = function() {
  var $$ = this;
  $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartBars);
};
ChartInternal.prototype.updateTargetsForBar = function(targets) {
  var $$ = this,
    config = $$.config,
    mainBars,
    mainBarEnter,
    classChartBar = $$.classChartBar.bind($$),
    classBars = $$.classBars.bind($$),
    classFocus = $$.classFocus.bind($$);
  mainBars = $$.main
    .select('.' + CLASS.chartBars)
    .selectAll('.' + CLASS.chartBar)
    .data(targets)
    .attr('class', function(d) {
      return classChartBar(d) + classFocus(d)
    });
  mainBarEnter = mainBars
    .enter()
    .append('g')
    .attr('class', classChartBar)
    .style('pointer-events', 'none');
  // Bars for each data
  mainBarEnter
    .append('g')
    .attr('class', classBars)
    .style('cursor', function(d) {
      return config.data_selection_isselectable(d) ? 'pointer' : null
    });
};
ChartInternal.prototype.updateBar = function(durationForExit) {
  var $$ = this,
    barData = $$.barData.bind($$),
    classBar = $$.classBar.bind($$),
    initialOpacity = $$.initialOpacity.bind($$),
    color = function(d) {
      return $$.color(d.id)
    };
  var mainBar = $$.main
    .selectAll('.' + CLASS.bars)
    .selectAll('.' + CLASS.bar)
    .data(barData);
  var mainBarEnter = mainBar
    .enter()
    .append('path')
    .attr('class', classBar)
    .style('stroke', color)
    .style('fill', color);
  $$.mainBar = mainBarEnter.merge(mainBar).style('opacity', initialOpacity);
  mainBar
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0);
};
ChartInternal.prototype.redrawBar = function(
  drawBar,
  withTransition,
  transition
) {
  const $$ = this;

  return [
    (withTransition ? this.mainBar.transition(transition) : this.mainBar)
      .attr('d', drawBar)
      .style('stroke', this.color)
      .style('fill', this.color)
      .style('opacity', d => ($$.isTargetToShow(d.id) ? 1 : 0))
  ]
};
ChartInternal.prototype.getBarW = function(axis, barTargetsNum) {
  var $$ = this,
    config = $$.config,
    w =
      typeof config.bar_width === 'number'
        ? config.bar_width
        : barTargetsNum
        ? (axis.tickInterval() * config.bar_width_ratio) / barTargetsNum
        : 0;
  return config.bar_width_max && w > config.bar_width_max
    ? config.bar_width_max
    : w
};
ChartInternal.prototype.getBars = function(i, id) {
  var $$ = this;
  return (id
    ? $$.main.selectAll('.' + CLASS.bars + $$.getTargetSelectorSuffix(id))
    : $$.main
  ).selectAll('.' + CLASS.bar + (isValue(i) ? '-' + i : ''))
};
ChartInternal.prototype.expandBars = function(i, id, reset) {
  var $$ = this;
  if (reset) {
    $$.unexpandBars();
  }
  $$.getBars(i, id).classed(CLASS.EXPANDED, true);
};
ChartInternal.prototype.unexpandBars = function(i) {
  var $$ = this;
  $$.getBars(i).classed(CLASS.EXPANDED, false);
};
ChartInternal.prototype.generateDrawBar = function(barIndices, isSub) {
  var $$ = this,
    config = $$.config,
    getPoints = $$.generateGetBarPoints(barIndices, isSub);
  return function(d, i) {
    // 4 points that make a bar
    var points = getPoints(d, i);

    // switch points if axis is rotated, not applicable for sub chart
    var indexX = config.axis_rotated ? 1 : 0;
    var indexY = config.axis_rotated ? 0 : 1;

    var path =
      'M ' +
      points[0][indexX] +
      ',' +
      points[0][indexY] +
      ' ' +
      'L' +
      points[1][indexX] +
      ',' +
      points[1][indexY] +
      ' ' +
      'L' +
      points[2][indexX] +
      ',' +
      points[2][indexY] +
      ' ' +
      'L' +
      points[3][indexX] +
      ',' +
      points[3][indexY] +
      ' ' +
      'z';

    return path
  }
};
ChartInternal.prototype.generateGetBarPoints = function(barIndices, isSub) {
  var $$ = this,
    axis = isSub ? $$.subXAxis : $$.xAxis,
    barTargetsNum = barIndices.__max__ + 1,
    barW = $$.getBarW(axis, barTargetsNum),
    barX = $$.getShapeX(barW, barTargetsNum, barIndices, !!isSub),
    barY = $$.getShapeY(!!isSub),
    barOffset = $$.getShapeOffset($$.isBarType, barIndices, !!isSub),
    barSpaceOffset = barW * ($$.config.bar_space / 2),
    yScale = isSub ? $$.getSubYScale : $$.getYScale;
  return function(d, i) {
    var y0 = yScale.call($$, d.id)(0),
      offset = barOffset(d, i) || y0, // offset is for stacked bar chart
      posX = barX(d),
      posY = barY(d);
    // fix posY not to overflow opposite quadrant
    if ($$.config.axis_rotated) {
      if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) {
        posY = y0;
      }
    }

    posY -= y0 - offset;

    // 4 points that make a bar
    return [
      [posX + barSpaceOffset, offset],
      [posX + barSpaceOffset, posY],
      [posX + barW - barSpaceOffset, posY],
      [posX + barW - barSpaceOffset, offset]
    ]
  }
};

/**
 * Returns whether the data point is within the given bar shape.
 *
 * @param mouse
 * @param barShape
 * @return {boolean}
 */
ChartInternal.prototype.isWithinBar = function(mouse, barShape) {
  return isWithinBox(mouse, getBBox(barShape), 2)
};

ChartInternal.prototype.getShapeIndices = function(typeFilter) {
  var $$ = this,
    config = $$.config,
    indices = {},
    i = 0,
    j,
    k;
  $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(
    function(d) {
      for (j = 0; j < config.data_groups.length; j++) {
        if (config.data_groups[j].indexOf(d.id) < 0) {
          continue
        }
        for (k = 0; k < config.data_groups[j].length; k++) {
          if (config.data_groups[j][k] in indices) {
            indices[d.id] = indices[config.data_groups[j][k]];
            break
          }
        }
      }
      if (isUndefined(indices[d.id])) {
        indices[d.id] = i++;
      }
    }
  );
  indices.__max__ = i - 1;
  return indices
};
ChartInternal.prototype.getShapeX = function(
  offset,
  targetsNum,
  indices,
  isSub
) {
  var $$ = this,
    scale = isSub ? $$.subX : $$.x;
  return function(d) {
    var index = d.id in indices ? indices[d.id] : 0;
    return d.x || d.x === 0 ? scale(d.x) - offset * (targetsNum / 2 - index) : 0
  }
};
ChartInternal.prototype.getShapeY = function(isSub) {
  const $$ = this;

  return function(d) {
    const scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id);
    return scale(
      $$.isTargetNormalized(d.id) ? $$.getRatio('index', d, true) : d.value
    )
  }
};
ChartInternal.prototype.getShapeOffset = function(typeFilter, indices, isSub) {
  var $$ = this,
    targets = $$.orderTargets(
      $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$))
    ),
    targetIds = targets.map(function(t) {
      return t.id
    });
  return function(d, i) {
    var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id),
      y0 = scale(0),
      offset = y0;
    targets.forEach(function(t) {
      const rowValues = $$.isStepType(d)
        ? $$.convertValuesToStep(t.values)
        : t.values;
      const isTargetNormalized = $$.isTargetNormalized(d.id);
      const values = rowValues.map(v =>
        isTargetNormalized ? $$.getRatio('index', v, true) : v.value
      );

      if (t.id === d.id || indices[t.id] !== indices[d.id]) {
        return
      }
      if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id)) {
        // check if the x values line up
        if (isUndefined(rowValues[i]) || +rowValues[i].x !== +d.x) {
          // "+" for timeseries
          // if not, try to find the value that does line up
          i = -1;
          rowValues.forEach(function(v, j) {
            const x1 = v.x.constructor === Date ? +v.x : v.x;
            const x2 = d.x.constructor === Date ? +d.x : d.x;

            if (x1 === x2) {
              i = j;
            }
          });
        }
        if (i in rowValues && rowValues[i].value * d.value >= 0) {
          offset += scale(values[i]) - y0;
        }
      }
    });
    return offset
  }
};
ChartInternal.prototype.isWithinShape = function(that, d) {
  var $$ = this,
    shape = $$.d3.select(that),
    isWithin;
  if (!$$.isTargetToShow(d.id)) {
    isWithin = false;
  } else if (that.nodeName === 'circle') {
    isWithin = $$.isStepType(d)
      ? $$.isWithinStep(that, $$.getYScale(d.id)(d.value))
      : $$.isWithinCircle(that, $$.pointSelectR(d) * 1.5);
  } else if (that.nodeName === 'path') {
    isWithin = shape.classed(CLASS.bar)
      ? $$.isWithinBar($$.d3.mouse(that), that)
      : true;
  }
  return isWithin
};

ChartInternal.prototype.getInterpolate = function(d) {
  var $$ = this,
    d3 = $$.d3,
    types = {
      linear: d3.curveLinear,
      'linear-closed': d3.curveLinearClosed,
      basis: d3.curveBasis,
      'basis-open': d3.curveBasisOpen,
      'basis-closed': d3.curveBasisClosed,
      bundle: d3.curveBundle,
      cardinal: d3.curveCardinal,
      'cardinal-open': d3.curveCardinalOpen,
      'cardinal-closed': d3.curveCardinalClosed,
      monotone: d3.curveMonotoneX,
      step: d3.curveStep,
      'step-before': d3.curveStepBefore,
      'step-after': d3.curveStepAfter
    },
    type;

  if ($$.isSplineType(d)) {
    type = types[$$.config.spline_interpolation_type] || types.cardinal;
  } else if ($$.isStepType(d)) {
    type = types[$$.config.line_step_type];
  } else {
    type = types.linear;
  }
  return type
};

ChartInternal.prototype.initLine = function() {
  var $$ = this;
  $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartLines);
};
ChartInternal.prototype.updateTargetsForLine = function(targets) {
  var $$ = this,
    config = $$.config,
    mainLines,
    mainLineEnter,
    classChartLine = $$.classChartLine.bind($$),
    classLines = $$.classLines.bind($$),
    classAreas = $$.classAreas.bind($$),
    classCircles = $$.classCircles.bind($$),
    classFocus = $$.classFocus.bind($$);
  mainLines = $$.main
    .select('.' + CLASS.chartLines)
    .selectAll('.' + CLASS.chartLine)
    .data(targets)
    .attr('class', function(d) {
      return classChartLine(d) + classFocus(d)
    });
  mainLineEnter = mainLines
    .enter()
    .append('g')
    .attr('class', classChartLine)
    .style('opacity', 0)
    .style('pointer-events', 'none');
  // Lines for each data
  mainLineEnter.append('g').attr('class', classLines);
  // Areas
  mainLineEnter.append('g').attr('class', classAreas);
  // Circles for each data point on lines
  mainLineEnter.append('g').attr('class', function(d) {
    return $$.generateClass(CLASS.selectedCircles, d.id)
  });
  mainLineEnter
    .append('g')
    .attr('class', classCircles)
    .style('cursor', function(d) {
      return config.data_selection_isselectable(d) ? 'pointer' : null
    });
  // Update date for selected circles
  targets.forEach(function(t) {
    $$.main
      .selectAll('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(t.id))
      .selectAll('.' + CLASS.selectedCircle)
      .each(function(d) {
        d.value = t.values[d.index].value;
      });
  });
  // MEMO: can not keep same color...
  //mainLineUpdate.exit().remove();
};
ChartInternal.prototype.updateLine = function(durationForExit) {
  var $$ = this;
  var mainLine = $$.main
    .selectAll('.' + CLASS.lines)
    .selectAll('.' + CLASS.line)
    .data($$.lineData.bind($$));
  var mainLineEnter = mainLine
    .enter()
    .append('path')
    .attr('class', $$.classLine.bind($$))
    .style('stroke', $$.color);
  $$.mainLine = mainLineEnter
    .merge(mainLine)
    .style('opacity', $$.initialOpacity.bind($$))
    .style('shape-rendering', function(d) {
      return $$.isStepType(d) ? 'crispEdges' : ''
    })
    .attr('transform', null);
  mainLine
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0);
};
ChartInternal.prototype.redrawLine = function(
  drawLine,
  withTransition,
  transition
) {
  return [
    (withTransition ? this.mainLine.transition(transition) : this.mainLine)
      .attr('d', drawLine)
      .style('stroke', this.color)
      .style('opacity', 1)
  ]
};
ChartInternal.prototype.generateDrawLine = function(lineIndices, isSub) {
  var $$ = this,
    config = $$.config,
    line = $$.d3.line(),
    getPoints = $$.generateGetLinePoints(lineIndices, isSub),
    yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
    xValue = function(d) {
      return (isSub ? $$.subxx : $$.xx).call($$, d)
    },
    yValue = function(d, i) {
      return config.data_groups.length > 0
        ? getPoints(d, i)[0][1]
        : yScaleGetter.call($$, d.id)(d.value)
    };

  line = config.axis_rotated
    ? line.x(yValue).y(xValue)
    : line.x(xValue).y(yValue);
  if (!config.line_connectNull) {
    line = line.defined(function(d) {
      return d.value != null
    });
  }
  return function(d) {
    var values = config.line_connectNull
        ? $$.filterRemoveNull(d.values)
        : d.values,
      x = isSub ? $$.subX : $$.x,
      y = yScaleGetter.call($$, d.id),
      x0 = 0,
      y0 = 0,
      path;
    if ($$.isLineType(d)) {
      if (config.data_regions[d.id]) {
        path = $$.lineWithRegions(values, x, y, config.data_regions[d.id]);
      } else {
        if ($$.isStepType(d)) {
          values = $$.convertValuesToStep(values);
        }
        path = line.curve($$.getInterpolate(d))(values);
      }
    } else {
      if (values[0]) {
        x0 = x(values[0].x);
        y0 = y(values[0].value);
      }
      path = config.axis_rotated ? 'M ' + y0 + ' ' + x0 : 'M ' + x0 + ' ' + y0;
    }
    return path ? path : 'M 0 0'
  }
};
ChartInternal.prototype.generateGetLinePoints = function(lineIndices, isSub) {
  // partial duplication of generateGetBarPoints
  var $$ = this,
    config = $$.config,
    lineTargetsNum = lineIndices.__max__ + 1,
    x = $$.getShapeX(0, lineTargetsNum, lineIndices, !!isSub),
    y = $$.getShapeY(!!isSub),
    lineOffset = $$.getShapeOffset($$.isLineType, lineIndices, !!isSub),
    yScale = isSub ? $$.getSubYScale : $$.getYScale;
  return function(d, i) {
    var y0 = yScale.call($$, d.id)(0),
      offset = lineOffset(d, i) || y0, // offset is for stacked area chart
      posX = x(d),
      posY = y(d);
    // fix posY not to overflow opposite quadrant
    if (config.axis_rotated) {
      if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) {
        posY = y0;
      }
    }
    // 1 point that marks the line position
    return [
      [posX, posY - (y0 - offset)],
      [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, posY - (y0 - offset)] // needed for compatibility
    ]
  }
};

ChartInternal.prototype.lineWithRegions = function(d, x, y, _regions) {
  var $$ = this,
    config = $$.config,
    prev = -1,
    i,
    j,
    s = 'M',
    sWithRegion,
    xp,
    yp,
    dx,
    dy,
    dd,
    diff,
    diffx2,
    xOffset = $$.isCategorized() ? 0.5 : 0,
    xValue,
    yValue,
    regions = [];

  function isWithinRegions(x, regions) {
    var i;
    for (i = 0; i < regions.length; i++) {
      if (regions[i].start < x && x <= regions[i].end) {
        return true
      }
    }
    return false
  }

  // Check start/end of regions
  if (isDefined(_regions)) {
    for (i = 0; i < _regions.length; i++) {
      regions[i] = {};
      if (isUndefined(_regions[i].start)) {
        regions[i].start = d[0].x;
      } else {
        regions[i].start = $$.isTimeSeries()
          ? $$.parseDate(_regions[i].start)
          : _regions[i].start;
      }
      if (isUndefined(_regions[i].end)) {
        regions[i].end = d[d.length - 1].x;
      } else {
        regions[i].end = $$.isTimeSeries()
          ? $$.parseDate(_regions[i].end)
          : _regions[i].end;
      }
    }
  }

  // Set scales
  xValue = config.axis_rotated
    ? function(d) {
        return y(d.value)
      }
    : function(d) {
        return x(d.x)
      };
  yValue = config.axis_rotated
    ? function(d) {
        return x(d.x)
      }
    : function(d) {
        return y(d.value)
      };

  // Define svg generator function for region
  function generateM(points) {
    return (
      'M' +
      points[0][0] +
      ' ' +
      points[0][1] +
      ' ' +
      points[1][0] +
      ' ' +
      points[1][1]
    )
  }
  if ($$.isTimeSeries()) {
    sWithRegion = function(d0, d1, j, diff) {
      var x0 = d0.x.getTime(),
        x_diff = d1.x - d0.x,
        xv0 = new Date(x0 + x_diff * j),
        xv1 = new Date(x0 + x_diff * (j + diff)),
        points;
      if (config.axis_rotated) {
        points = [
          [y(yp(j)), x(xv0)],
          [y(yp(j + diff)), x(xv1)]
        ];
      } else {
        points = [
          [x(xv0), y(yp(j))],
          [x(xv1), y(yp(j + diff))]
        ];
      }
      return generateM(points)
    };
  } else {
    sWithRegion = function(d0, d1, j, diff) {
      var points;
      if (config.axis_rotated) {
        points = [
          [y(yp(j), true), x(xp(j))],
          [y(yp(j + diff), true), x(xp(j + diff))]
        ];
      } else {
        points = [
          [x(xp(j), true), y(yp(j))],
          [x(xp(j + diff), true), y(yp(j + diff))]
        ];
      }
      return generateM(points)
    };
  }

  // Generate
  for (i = 0; i < d.length; i++) {
    // Draw as normal
    if (isUndefined(regions) || !isWithinRegions(d[i].x, regions)) {
      s += ' ' + xValue(d[i]) + ' ' + yValue(d[i]);
    }
    // Draw with region // TODO: Fix for horizotal charts
    else {
      xp = $$.getScale(
        d[i - 1].x + xOffset,
        d[i].x + xOffset,
        $$.isTimeSeries()
      );
      yp = $$.getScale(d[i - 1].value, d[i].value);

      dx = x(d[i].x) - x(d[i - 1].x);
      dy = y(d[i].value) - y(d[i - 1].value);
      dd = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
      diff = 2 / dd;
      diffx2 = diff * 2;

      for (j = diff; j <= 1; j += diffx2) {
        s += sWithRegion(d[i - 1], d[i], j, diff);
      }
    }
    prev = d[i].x;
  }

  return s
};

ChartInternal.prototype.updateArea = function(durationForExit) {
  var $$ = this,
    d3 = $$.d3;
  var mainArea = $$.main
    .selectAll('.' + CLASS.areas)
    .selectAll('.' + CLASS.area)
    .data($$.lineData.bind($$));
  var mainAreaEnter = mainArea
    .enter()
    .append('path')
    .attr('class', $$.classArea.bind($$))
    .style('fill', $$.color)
    .style('opacity', function() {
      $$.orgAreaOpacity = +d3.select(this).style('opacity');
      return 0
    });
  $$.mainArea = mainAreaEnter
    .merge(mainArea)
    .style('opacity', $$.orgAreaOpacity);
  mainArea
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0);
};
ChartInternal.prototype.redrawArea = function(
  drawArea,
  withTransition,
  transition
) {
  return [
    (withTransition ? this.mainArea.transition(transition) : this.mainArea)
      .attr('d', drawArea)
      .style('fill', this.color)
      .style('opacity', this.orgAreaOpacity)
  ]
};
ChartInternal.prototype.generateDrawArea = function(areaIndices, isSub) {
  var $$ = this,
    config = $$.config,
    area = $$.d3.area(),
    getPoints = $$.generateGetAreaPoints(areaIndices, isSub),
    yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
    xValue = function(d) {
      return (isSub ? $$.subxx : $$.xx).call($$, d)
    },
    value0 = function(d, i) {
      return config.data_groups.length > 0
        ? getPoints(d, i)[0][1]
        : yScaleGetter.call($$, d.id)($$.getAreaBaseValue(d.id))
    },
    value1 = function(d, i) {
      return config.data_groups.length > 0
        ? getPoints(d, i)[1][1]
        : yScaleGetter.call($$, d.id)(d.value)
    };

  area = config.axis_rotated
    ? area
        .x0(value0)
        .x1(value1)
        .y(xValue)
    : area
        .x(xValue)
        .y0(config.area_above ? 0 : value0)
        .y1(value1);
  if (!config.line_connectNull) {
    area = area.defined(function(d) {
      return d.value !== null
    });
  }

  return function(d) {
    var values = config.line_connectNull
        ? $$.filterRemoveNull(d.values)
        : d.values,
      x0 = 0,
      y0 = 0,
      path;
    if ($$.isAreaType(d)) {
      if ($$.isStepType(d)) {
        values = $$.convertValuesToStep(values);
      }
      path = area.curve($$.getInterpolate(d))(values);
    } else {
      if (values[0]) {
        x0 = $$.x(values[0].x);
        y0 = $$.getYScale(d.id)(values[0].value);
      }
      path = config.axis_rotated ? 'M ' + y0 + ' ' + x0 : 'M ' + x0 + ' ' + y0;
    }
    return path ? path : 'M 0 0'
  }
};
ChartInternal.prototype.getAreaBaseValue = function() {
  return 0
};
ChartInternal.prototype.generateGetAreaPoints = function(areaIndices, isSub) {
  // partial duplication of generateGetBarPoints
  var $$ = this,
    config = $$.config,
    areaTargetsNum = areaIndices.__max__ + 1,
    x = $$.getShapeX(0, areaTargetsNum, areaIndices, !!isSub),
    y = $$.getShapeY(!!isSub),
    areaOffset = $$.getShapeOffset($$.isAreaType, areaIndices, !!isSub),
    yScale = isSub ? $$.getSubYScale : $$.getYScale;
  return function(d, i) {
    var y0 = yScale.call($$, d.id)(0),
      offset = areaOffset(d, i) || y0, // offset is for stacked area chart
      posX = x(d),
      posY = y(d);
    // fix posY not to overflow opposite quadrant
    if (config.axis_rotated) {
      if ((0 < d.value && posY < y0) || (d.value < 0 && y0 < posY)) {
        posY = y0;
      }
    }
    // 1 point that marks the area position
    return [
      [posX, offset],
      [posX, posY - (y0 - offset)],
      [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, offset] // needed for compatibility
    ]
  }
};

ChartInternal.prototype.updateCircle = function(cx, cy) {
  var $$ = this;
  var mainCircle = $$.main
    .selectAll('.' + CLASS.circles)
    .selectAll('.' + CLASS.circle)
    .data($$.lineOrScatterOrStanfordData.bind($$));

  var mainCircleEnter = mainCircle
    .enter()
    .append('circle')
    .attr('shape-rendering', $$.isStanfordGraphType() ? 'crispEdges' : '')
    .attr('class', $$.classCircle.bind($$))
    .attr('cx', cx)
    .attr('cy', cy)
    .attr('r', $$.pointR.bind($$))
    .style(
      'color',
      $$.isStanfordGraphType() ? $$.getStanfordPointColor.bind($$) : $$.color
    );

  $$.mainCircle = mainCircleEnter
    .merge(mainCircle)
    .style(
      'opacity',
      $$.isStanfordGraphType() ? 1 : $$.initialOpacityForCircle.bind($$)
    );

  mainCircle.exit().style('opacity', 0);
};
ChartInternal.prototype.redrawCircle = function(
  cx,
  cy,
  withTransition,
  transition
) {
  var $$ = this,
    selectedCircles = $$.main.selectAll('.' + CLASS.selectedCircle);
  return [
    (withTransition ? $$.mainCircle.transition(transition) : $$.mainCircle)
      .style('opacity', this.opacityForCircle.bind($$))
      .style(
        'color',
        $$.isStanfordGraphType() ? $$.getStanfordPointColor.bind($$) : $$.color
      )
      .attr('cx', cx)
      .attr('cy', cy),
    (withTransition ? selectedCircles.transition(transition) : selectedCircles)
      .attr('cx', cx)
      .attr('cy', cy)
  ]
};
ChartInternal.prototype.circleX = function(d) {
  return d.x || d.x === 0 ? this.x(d.x) : null
};
ChartInternal.prototype.updateCircleY = function() {
  var $$ = this,
    lineIndices,
    getPoints;
  if ($$.config.data_groups.length > 0) {
(lineIndices = $$.getShapeIndices($$.isLineType)),
      (getPoints = $$.generateGetLinePoints(lineIndices));
    $$.circleY = function(d, i) {
      return getPoints(d, i)[0][1]
    };
  } else {
    $$.circleY = function(d) {
      return $$.getYScale(d.id)(d.value)
    };
  }
};
ChartInternal.prototype.getCircles = function(i, id) {
  var $$ = this;
  return (id
    ? $$.main.selectAll('.' + CLASS.circles + $$.getTargetSelectorSuffix(id))
    : $$.main
  ).selectAll('.' + CLASS.circle + (isValue(i) ? '-' + i : ''))
};
ChartInternal.prototype.expandCircles = function(i, id, reset) {
  var $$ = this,
    r = $$.pointExpandedR.bind($$);
  if (reset) {
    $$.unexpandCircles();
  }
  $$.getCircles(i, id)
    .classed(CLASS.EXPANDED, true)
    .attr('r', r);
};
ChartInternal.prototype.unexpandCircles = function(i) {
  var $$ = this,
    r = $$.pointR.bind($$);
  $$.getCircles(i)
    .filter(function() {
      return $$.d3.select(this).classed(CLASS.EXPANDED)
    })
    .classed(CLASS.EXPANDED, false)
    .attr('r', r);
};
ChartInternal.prototype.pointR = function(d) {
  var $$ = this,
    config = $$.config;
  return $$.isStepType(d)
    ? 0
    : isFunction(config.point_r)
    ? config.point_r(d)
    : config.point_r
};
ChartInternal.prototype.pointExpandedR = function(d) {
  var $$ = this,
    config = $$.config;
  if (config.point_focus_expand_enabled) {
    return isFunction(config.point_focus_expand_r)
      ? config.point_focus_expand_r(d)
      : config.point_focus_expand_r
      ? config.point_focus_expand_r
      : $$.pointR(d) * 1.75
  } else {
    return $$.pointR(d)
  }
};
ChartInternal.prototype.pointSelectR = function(d) {
  var $$ = this,
    config = $$.config;
  return isFunction(config.point_select_r)
    ? config.point_select_r(d)
    : config.point_select_r
    ? config.point_select_r
    : $$.pointR(d) * 4
};
ChartInternal.prototype.isWithinCircle = function(that, r) {
  var d3 = this.d3,
    mouse = d3.mouse(that),
    d3_this = d3.select(that),
    cx = +d3_this.attr('cx'),
    cy = +d3_this.attr('cy');
  return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < r
};
ChartInternal.prototype.isWithinStep = function(that, y) {
  return Math.abs(y - this.d3.mouse(that)[1]) < 30
};

ChartInternal.prototype.getCurrentWidth = function() {
  var $$ = this,
    config = $$.config;
  return config.size_width ? config.size_width : $$.getParentWidth()
};
ChartInternal.prototype.getCurrentHeight = function() {
  var $$ = this,
    config = $$.config,
    h = config.size_height ? config.size_height : $$.getParentHeight();
  return h > 0
    ? h
    : 320 / ($$.hasType('gauge') && !config.gauge_fullCircle ? 2 : 1)
};
ChartInternal.prototype.getCurrentPaddingTop = function() {
  var $$ = this,
    config = $$.config,
    padding = isValue(config.padding_top) ? config.padding_top : 0;
  if ($$.title && $$.title.node()) {
    padding += $$.getTitlePadding();
  }
  return padding
};
ChartInternal.prototype.getCurrentPaddingBottom = function() {
  var config = this.config;
  return isValue(config.padding_bottom) ? config.padding_bottom : 0
};
ChartInternal.prototype.getCurrentPaddingLeft = function(withoutRecompute) {
  var $$ = this,
    config = $$.config;
  if (isValue(config.padding_left)) {
    return config.padding_left
  } else if (config.axis_rotated) {
    return !config.axis_x_show || config.axis_x_inner
      ? 1
      : Math.max(ceil10($$.getAxisWidthByAxisId('x', withoutRecompute)), 40)
  } else if (!config.axis_y_show || config.axis_y_inner) {
    // && !config.axis_rotated
    return $$.axis.getYAxisLabelPosition().isOuter ? 30 : 1
  } else {
    return ceil10($$.getAxisWidthByAxisId('y', withoutRecompute))
  }
};
ChartInternal.prototype.getCurrentPaddingRight = function() {
  var $$ = this,
    config = $$.config,
    padding = 0,
    defaultPadding = 10,
    legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;

  if (isValue(config.padding_right)) {
    padding = config.padding_right + 1; // 1 is needed not to hide tick line
  } else if (config.axis_rotated) {
    padding = defaultPadding + legendWidthOnRight;
  } else if (!config.axis_y2_show || config.axis_y2_inner) {
    // && !config.axis_rotated
    padding =
      2 +
      legendWidthOnRight +
      ($$.axis.getY2AxisLabelPosition().isOuter ? 20 : 0);
  } else {
    padding = ceil10($$.getAxisWidthByAxisId('y2')) + legendWidthOnRight;
  }

  if ($$.colorScale && $$.colorScale.node()) {
    padding += $$.getColorScalePadding();
  }

  return padding
};

ChartInternal.prototype.getParentRectValue = function(key) {
  var parent = this.selectChart.node(),
    v;
  while (parent && parent.tagName !== 'BODY') {
    try {
      v = parent.getBoundingClientRect()[key];
    } catch (e) {
      if (key === 'width') {
        // In IE in certain cases getBoundingClientRect
        // will cause an "unspecified error"
        v = parent.offsetWidth;
      }
    }
    if (v) {
      break
    }
    parent = parent.parentNode;
  }
  return v
};
ChartInternal.prototype.getParentWidth = function() {
  return this.getParentRectValue('width')
};
ChartInternal.prototype.getParentHeight = function() {
  var h = this.selectChart.style('height');
  return h.indexOf('px') > 0 ? +h.replace('px', '') : 0
};

ChartInternal.prototype.getSvgLeft = function(withoutRecompute) {
  var $$ = this,
    config = $$.config,
    hasLeftAxisRect =
      config.axis_rotated || (!config.axis_rotated && !config.axis_y_inner),
    leftAxisClass = config.axis_rotated ? CLASS.axisX : CLASS.axisY,
    leftAxis = $$.main.select('.' + leftAxisClass).node(),
    svgRect =
      leftAxis && hasLeftAxisRect
        ? leftAxis.getBoundingClientRect()
        : { right: 0 },
    chartRect = $$.selectChart.node().getBoundingClientRect(),
    hasArc = $$.hasArcType(),
    svgLeft =
      svgRect.right -
      chartRect.left -
      (hasArc ? 0 : $$.getCurrentPaddingLeft(withoutRecompute));
  return svgLeft > 0 ? svgLeft : 0
};

ChartInternal.prototype.getAxisWidthByAxisId = function(id, withoutRecompute) {
  var $$ = this,
    position = $$.axis.getLabelPositionById(id);
  return (
    $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40)
  )
};
ChartInternal.prototype.getHorizontalAxisHeight = function(axisId) {
  var $$ = this,
    config = $$.config,
    h = 30;
  if (axisId === 'x' && !config.axis_x_show) {
    return 8
  }
  if (axisId === 'x' && config.axis_x_height) {
    return config.axis_x_height
  }
  if (axisId === 'y' && !config.axis_y_show) {
    return config.legend_show && !$$.isLegendRight && !$$.isLegendInset ? 10 : 1
  }
  if (axisId === 'y2' && !config.axis_y2_show) {
    return $$.rotated_padding_top
  }
  // Calculate x axis height when tick rotated
  if (axisId === 'x' && !config.axis_rotated && config.axis_x_tick_rotate) {
    h =
      30 +
      $$.axis.getMaxTickWidth(axisId) *
        Math.cos((Math.PI * (90 - Math.abs(config.axis_x_tick_rotate))) / 180);
  }
  // Calculate y axis height when tick rotated
  if (axisId === 'y' && config.axis_rotated && config.axis_y_tick_rotate) {
    h =
      30 +
      $$.axis.getMaxTickWidth(axisId) *
        Math.cos((Math.PI * (90 - Math.abs(config.axis_y_tick_rotate))) / 180);
  }
  return (
    h +
    ($$.axis.getLabelPositionById(axisId).isInner ? 0 : 10) +
    (axisId === 'y2' ? -10 : 0)
  )
};

ChartInternal.prototype.initBrush = function(scale) {
  var $$ = this,
    d3 = $$.d3;
  // TODO: dynamically change brushY/brushX according to axis_rotated.
  $$.brush = ($$.config.axis_rotated ? d3.brushY() : d3.brushX())
    .on('brush', function() {
      var event = d3.event.sourceEvent;
      if (event && event.type === 'zoom') {
        return
      }
      $$.redrawForBrush();
    })
    .on('end', function() {
      var event = d3.event.sourceEvent;
      if (event && event.type === 'zoom') {
        return
      }
      if ($$.brush.empty() && event && event.type !== 'end') {
        $$.brush.clear();
      }
    });
  $$.brush.updateExtent = function() {
    var range = this.scale.range(),
      extent;
    if ($$.config.axis_rotated) {
      extent = [
        [0, range[0]],
        [$$.width2, range[1]]
      ];
    } else {
      extent = [
        [range[0], 0],
        [range[1], $$.height2]
      ];
    }
    this.extent(extent);
    return this
  };
  $$.brush.updateScale = function(scale) {
    this.scale = scale;
    return this
  };
  $$.brush.update = function(scale) {
    this.updateScale(scale || $$.subX).updateExtent();
    $$.context.select('.' + CLASS.brush).call(this);
  };
  $$.brush.clear = function() {
    $$.context.select('.' + CLASS.brush).call($$.brush.move, null);
  };
  $$.brush.selection = function() {
    return d3.brushSelection($$.context.select('.' + CLASS.brush).node())
  };
  $$.brush.selectionAsValue = function(selectionAsValue, withTransition) {
    var selection, brush;
    if (selectionAsValue) {
      if ($$.context) {
        selection = [
          this.scale(selectionAsValue[0]),
          this.scale(selectionAsValue[1])
        ];
        brush = $$.context.select('.' + CLASS.brush);
        if (withTransition) {
          brush = brush.transition();
        }
        $$.brush.move(brush, selection);
      }
      return []
    }
    selection = $$.brush.selection() || [0, 0];
    return [this.scale.invert(selection[0]), this.scale.invert(selection[1])]
  };
  $$.brush.empty = function() {
    var selection = $$.brush.selection();
    return !selection || selection[0] === selection[1]
  };
  return $$.brush.updateScale(scale)
};
ChartInternal.prototype.initSubchart = function() {
  var $$ = this,
    config = $$.config,
    context = ($$.context = $$.svg
      .append('g')
      .attr('transform', $$.getTranslate('context')));

  // set style
  context.style('visibility', 'visible');

  // Define g for chart area
  context
    .append('g')
    .attr('clip-path', $$.clipPathForSubchart)
    .attr('class', CLASS.chart);

  // Define g for bar chart area
  context
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartBars);

  // Define g for line chart area
  context
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartLines);

  // Add extent rect for Brush
  context
    .append('g')
    .attr('clip-path', $$.clipPath)
    .attr('class', CLASS.brush);

  // ATTENTION: This must be called AFTER chart added
  // Add Axis
  $$.axes.subx = context
    .append('g')
    .attr('class', CLASS.axisX)
    .attr('transform', $$.getTranslate('subx'))
    .attr('clip-path', config.axis_rotated ? '' : $$.clipPathForXAxis);
};
ChartInternal.prototype.initSubchartBrush = function() {
  var $$ = this;
  // Add extent rect for Brush
  $$.initBrush($$.subX).updateExtent();
  $$.context.select('.' + CLASS.brush).call($$.brush);
};
ChartInternal.prototype.updateTargetsForSubchart = function(targets) {
  var $$ = this,
    context = $$.context,
    config = $$.config,
    contextLineEnter,
    contextLine,
    contextBarEnter,
    contextBar,
    classChartBar = $$.classChartBar.bind($$),
    classBars = $$.classBars.bind($$),
    classChartLine = $$.classChartLine.bind($$),
    classLines = $$.classLines.bind($$),
    classAreas = $$.classAreas.bind($$);

  //-- Bar --//
  contextBar = context
    .select('.' + CLASS.chartBars)
    .selectAll('.' + CLASS.chartBar)
    .data(targets);
  contextBarEnter = contextBar
    .enter()
    .append('g')
    .style('opacity', 0);
  contextBarEnter.merge(contextBar).attr('class', classChartBar);
  // Bars for each data
  contextBarEnter.append('g').attr('class', classBars);

  //-- Line --//
  contextLine = context
    .select('.' + CLASS.chartLines)
    .selectAll('.' + CLASS.chartLine)
    .data(targets);
  contextLineEnter = contextLine
    .enter()
    .append('g')
    .style('opacity', 0);
  contextLineEnter.merge(contextLine).attr('class', classChartLine);
  // Lines for each data
  contextLineEnter.append('g').attr('class', classLines);
  // Area
  contextLineEnter.append('g').attr('class', classAreas);

  //-- Brush --//
  context
    .selectAll('.' + CLASS.brush + ' rect')
    .attr(
      config.axis_rotated ? 'width' : 'height',
      config.axis_rotated ? $$.width2 : $$.height2
    );
};
ChartInternal.prototype.updateBarForSubchart = function(durationForExit) {
  var $$ = this;
  var contextBar = $$.context
    .selectAll('.' + CLASS.bars)
    .selectAll('.' + CLASS.bar)
    .data($$.barData.bind($$));
  var contextBarEnter = contextBar
    .enter()
    .append('path')
    .attr('class', $$.classBar.bind($$))
    .style('stroke', 'none')
    .style('fill', $$.color);
  contextBar
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0)
    .remove();
  $$.contextBar = contextBarEnter
    .merge(contextBar)
    .style('opacity', $$.initialOpacity.bind($$));
};
ChartInternal.prototype.redrawBarForSubchart = function(
  drawBarOnSub,
  withTransition,
  duration
) {
(withTransition
    ? this.contextBar.transition(Math.random().toString()).duration(duration)
    : this.contextBar
  )
    .attr('d', drawBarOnSub)
    .style('opacity', 1);
};
ChartInternal.prototype.updateLineForSubchart = function(durationForExit) {
  var $$ = this;
  var contextLine = $$.context
    .selectAll('.' + CLASS.lines)
    .selectAll('.' + CLASS.line)
    .data($$.lineData.bind($$));
  var contextLineEnter = contextLine
    .enter()
    .append('path')
    .attr('class', $$.classLine.bind($$))
    .style('stroke', $$.color);
  contextLine
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0)
    .remove();
  $$.contextLine = contextLineEnter
    .merge(contextLine)
    .style('opacity', $$.initialOpacity.bind($$));
};
ChartInternal.prototype.redrawLineForSubchart = function(
  drawLineOnSub,
  withTransition,
  duration
) {
(withTransition
    ? this.contextLine.transition(Math.random().toString()).duration(duration)
    : this.contextLine
  )
    .attr('d', drawLineOnSub)
    .style('opacity', 1);
};
ChartInternal.prototype.updateAreaForSubchart = function(durationForExit) {
  var $$ = this,
    d3 = $$.d3;
  var contextArea = $$.context
    .selectAll('.' + CLASS.areas)
    .selectAll('.' + CLASS.area)
    .data($$.lineData.bind($$));
  var contextAreaEnter = contextArea
    .enter()
    .append('path')
    .attr('class', $$.classArea.bind($$))
    .style('fill', $$.color)
    .style('opacity', function() {
      $$.orgAreaOpacity = +d3.select(this).style('opacity');
      return 0
    });
  contextArea
    .exit()
    .transition()
    .duration(durationForExit)
    .style('opacity', 0)
    .remove();
  $$.contextArea = contextAreaEnter.merge(contextArea).style('opacity', 0);
};
ChartInternal.prototype.redrawAreaForSubchart = function(
  drawAreaOnSub,
  withTransition,
  duration
) {
(withTransition
    ? this.contextArea.transition(Math.random().toString()).duration(duration)
    : this.contextArea
  )
    .attr('d', drawAreaOnSub)
    .style('fill', this.color)
    .style('opacity', this.orgAreaOpacity);
};
ChartInternal.prototype.redrawSubchart = function(
  withSubchart,
  transitions,
  duration,
  durationForExit,
  areaIndices,
  barIndices,
  lineIndices
) {
  var $$ = this,
    d3 = $$.d3,
    drawAreaOnSub,
    drawBarOnSub,
    drawLineOnSub;

  // reflect main chart to extent on subchart if zoomed
  if (d3.event && d3.event.type === 'zoom') {
    $$.brush.selectionAsValue($$.x.orgDomain());
  }
  // update subchart elements if needed
  if (withSubchart) {
    // extent rect
    if (!$$.brush.empty()) {
      $$.brush.selectionAsValue($$.x.orgDomain());
    }
    // setup drawer - MEMO: this must be called after axis updated
    drawAreaOnSub = $$.generateDrawArea(areaIndices, true);
    drawBarOnSub = $$.generateDrawBar(barIndices, true);
    drawLineOnSub = $$.generateDrawLine(lineIndices, true);

    $$.updateBarForSubchart(duration);
    $$.updateLineForSubchart(duration);
    $$.updateAreaForSubchart(duration);

    $$.redrawBarForSubchart(drawBarOnSub, duration, duration);
    $$.redrawLineForSubchart(drawLineOnSub, duration, duration);
    $$.redrawAreaForSubchart(drawAreaOnSub, duration, duration);
  }
};
ChartInternal.prototype.redrawForBrush = function() {
  var $$ = this,
    x = $$.x,
    d3 = $$.d3,
    s;
  $$.redraw({
    withTransition: false,
    withY: $$.config.zoom_rescale,
    withSubchart: false,
    withUpdateXDomain: true,
    withEventRect: false,
    withDimension: false
  });
  // update zoom transation binded to event rect
  s = d3.event.selection || $$.brush.scale.range();
  $$.main
    .select('.' + CLASS.eventRect)
    .call(
      $$.zoom.transform,
      d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0)
    );
  $$.config.subchart_onbrush.call($$.api, x.orgDomain());
};
ChartInternal.prototype.transformContext = function(
  withTransition,
  transitions
) {
  var $$ = this,
    subXAxis;
  if (transitions && transitions.axisSubX) {
    subXAxis = transitions.axisSubX;
  } else {
    subXAxis = $$.context.select('.' + CLASS.axisX);
    if (withTransition) {
      subXAxis = subXAxis.transition();
    }
  }
  $$.context.attr('transform', $$.getTranslate('context'));
  subXAxis.attr('transform', $$.getTranslate('subx'));
};
ChartInternal.prototype.getDefaultSelection = function() {
  var $$ = this,
    config = $$.config,
    selection = isFunction(config.axis_x_selection)
      ? config.axis_x_selection($$.getXDomain($$.data.targets))
      : config.axis_x_selection;
  if ($$.isTimeSeries()) {
    selection = [$$.parseDate(selection[0]), $$.parseDate(selection[1])];
  }
  return selection
};

ChartInternal.prototype.removeSubchart = function() {
  const $$ = this;

  $$.brush = null;
  $$.context.remove();
  $$.context = null;
};

ChartInternal.prototype.initText = function() {
  var $$ = this;
  $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartTexts);
  $$.mainText = $$.d3.selectAll([]);
};
ChartInternal.prototype.updateTargetsForText = function(targets) {
  var $$ = this,
    classChartText = $$.classChartText.bind($$),
    classTexts = $$.classTexts.bind($$),
    classFocus = $$.classFocus.bind($$);
  var mainText = $$.main
    .select('.' + CLASS.chartTexts)
    .selectAll('.' + CLASS.chartText)
    .data(targets);
  var mainTextEnter = mainText
    .enter()
    .append('g')
    .attr('class', classChartText)
    .style('opacity', 0)
    .style('pointer-events', 'none');
  mainTextEnter.append('g').attr('class', classTexts);
  mainTextEnter.merge(mainText).attr('class', function(d) {
    return classChartText(d) + classFocus(d)
  });
};
ChartInternal.prototype.updateText = function(
  xForText,
  yForText,
  durationForExit
) {
  var $$ = this,
    config = $$.config,
    barOrLineData = $$.barOrLineData.bind($$),
    classText = $$.classText.bind($$);
  var mainText = $$.main
    .selectAll('.' + CLASS.texts)
    .selectAll('.' + CLASS.text)
    .data(barOrLineData);
  var mainTextEnter = mainText
    .enter()
    .append('text')
    .attr('class', classText)
    .attr('text-anchor', function(d) {
      return config.axis_rotated ? (d.value < 0 ? 'end' : 'start') : 'middle'
    })
    .style('stroke', 'none')
    .attr('x', xForText)
    .attr('y', yForText)
    .style('fill', function(d) {
      return $$.color(d)
    })
    .style('fill-opacity', 0);
  $$.mainText = mainTextEnter.merge(mainText).text(function(d, i, j) {
    return $$.dataLabelFormat(d.id)(d.value, d.id, i, j)
  });
  mainText
    .exit()
    .transition()
    .duration(durationForExit)
    .style('fill-opacity', 0)
    .remove();
};
ChartInternal.prototype.redrawText = function(
  xForText,
  yForText,
  forFlow,
  withTransition,
  transition
) {
  return [
    (withTransition ? this.mainText.transition(transition) : this.mainText)
      .attr('x', xForText)
      .attr('y', yForText)
      .style('fill', this.color)
      .style('fill-opacity', forFlow ? 0 : this.opacityForText.bind(this))
  ]
};
ChartInternal.prototype.getTextRect = function(text, cls, element) {
  var dummy = this.d3
      .select('body')
      .append('div')
      .classed('c3', true),
    svg = dummy
      .append('svg')
      .style('visibility', 'hidden')
      .style('position', 'fixed')
      .style('top', 0)
      .style('left', 0),
    font = this.d3.select(element).style('font'),
    rect;
  svg
    .selectAll('.dummy')
    .data([text])
    .enter()
    .append('text')
    .classed(cls ? cls : '', true)
    .style('font', font)
    .text(text)
    .each(function() {
      rect = getBBox(this);
    });
  dummy.remove();
  return rect
};
ChartInternal.prototype.generateXYForText = function(
  areaIndices,
  barIndices,
  lineIndices,
  forX
) {
  var $$ = this,
    getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
    getBarPoints = $$.generateGetBarPoints(barIndices, false),
    getLinePoints = $$.generateGetLinePoints(lineIndices, false),
    getter = forX ? $$.getXForText : $$.getYForText;
  return function(d, i) {
    var getPoints = $$.isAreaType(d)
      ? getAreaPoints
      : $$.isBarType(d)
      ? getBarPoints
      : getLinePoints;
    return getter.call($$, getPoints(d, i), d, this)
  }
};
ChartInternal.prototype.getXForText = function(points, d, textElement) {
  var $$ = this,
    box = getBBox(textElement),
    xPos,
    padding;
  if ($$.config.axis_rotated) {
    padding = $$.isBarType(d) ? 4 : 6;
    xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
  } else {
    xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0];
  }
  // show labels regardless of the domain if value is null
  if (d.value === null) {
    if (xPos > $$.width) {
      xPos = $$.width - box.width;
    } else if (xPos < 0) {
      xPos = 4;
    }
  }
  return xPos
};
ChartInternal.prototype.getYForText = function(points, d, textElement) {
  var $$ = this,
    box = getBBox(textElement),
    yPos;
  if ($$.config.axis_rotated) {
    yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
  } else {
    yPos = points[2][1];
    if (d.value < 0 || (d.value === 0 && !$$.hasPositiveValue)) {
      yPos += box.height;
      if ($$.isBarType(d) && $$.isSafari()) {
        yPos -= 3;
      } else if (!$$.isBarType(d) && $$.isChrome()) {
        yPos += 3;
      }
    } else {
      yPos += $$.isBarType(d) ? -3 : -6;
    }
  }
  // show labels regardless of the domain if value is null
  if (d.value === null && !$$.config.axis_rotated) {
    if (yPos < box.height) {
      yPos = box.height;
    } else if (yPos > this.height) {
      yPos = this.height - 4;
    }
  }
  return yPos
};

ChartInternal.prototype.initTitle = function() {
  var $$ = this;
  $$.title = $$.svg
    .append('text')
    .text($$.config.title_text)
    .attr('class', $$.CLASS.title);
};
ChartInternal.prototype.redrawTitle = function() {
  var $$ = this;
  $$.title.attr('x', $$.xForTitle.bind($$)).attr('y', $$.yForTitle.bind($$));
};
ChartInternal.prototype.xForTitle = function() {
  var $$ = this,
    config = $$.config,
    position = config.title_position || 'left',
    x;
  if (position.indexOf('right') >= 0) {
    x =
      $$.currentWidth -
      $$.getTextRect(
        $$.title.node().textContent,
        $$.CLASS.title,
        $$.title.node()
      ).width -
      config.title_padding.right;
  } else if (position.indexOf('center') >= 0) {
    x = Math.max(
      ($$.currentWidth -
        $$.getTextRect(
          $$.title.node().textContent,
          $$.CLASS.title,
          $$.title.node()
        ).width) /
        2,
      0
    );
  } else {
    // left
    x = config.title_padding.left;
  }
  return x
};
ChartInternal.prototype.yForTitle = function() {
  var $$ = this;
  return (
    $$.config.title_padding.top +
    $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node())
      .height
  )
};
ChartInternal.prototype.getTitlePadding = function() {
  var $$ = this;
  return $$.yForTitle() + $$.config.title_padding.bottom
};

function powerOfTen(d) {
  return d / Math.pow(10, Math.ceil(Math.log(d) / Math.LN10 - 1e-12)) === 1
}

ChartInternal.prototype.drawColorScale = function() {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    target = $$.data.targets[0],
    barWidth,
    barHeight,
    axis,
    points,
    legendAxis,
    axisScale,
    inverseScale,
    height;

  barWidth = !isNaN(config.stanford_scaleWidth)
    ? config.stanford_scaleWidth
    : 20;
  barHeight = 5;

  if (barHeight < 0 || barWidth < 0) {
    throw Error("Colorscale's barheight and barwidth must be greater than 0.")
  }

  height =
    $$.height - config.stanford_padding.bottom - config.stanford_padding.top;

  points = d3.range(config.stanford_padding.bottom, height, barHeight);

  inverseScale = d3
    .scaleSequential(target.colors)
    .domain([points[points.length - 1], points[0]]);

  if ($$.colorScale) {
    $$.colorScale.remove();
  }

  $$.colorScale = $$.svg
    .append('g')
    .attr('width', 50)
    .attr('height', height)
    .attr('class', CLASS.colorScale);

  $$.colorScale
    .append('g')
    .attr('transform', `translate(0, ${config.stanford_padding.top})`)
    .selectAll('bars')
    .data(points)
    .enter()
    .append('rect')
    .attr('y', (d, i) => i * barHeight)
    .attr('x', 0)
    .attr('width', barWidth)
    .attr('height', barHeight)
    .attr('fill', function(d) {
      return inverseScale(d)
    });

  // Legend Axis
  axisScale = d3
    .scaleLog()
    .domain([target.minEpochs, target.maxEpochs])
    .range([
      points[0] +
        config.stanford_padding.top +
        points[points.length - 1] +
        barHeight -
        1,
      points[0] + config.stanford_padding.top
    ]);

  legendAxis = d3.axisRight(axisScale);

  if (config.stanford_scaleFormat === 'pow10') {
    legendAxis.tickValues([1, 10, 100, 1000, 10000, 100000, 1000000, 10000000]);
  } else if (isFunction(config.stanford_scaleFormat)) {
    legendAxis.tickFormat(config.stanford_scaleFormat);
  } else {
    legendAxis.tickFormat(d3.format('d'));
  }

  if (isFunction(config.stanford_scaleValues)) {
    legendAxis.tickValues(
      config.stanford_scaleValues(target.minEpochs, target.maxEpochs)
    );
  }

  // Draw Axis
  axis = $$.colorScale
    .append('g')
    .attr('class', 'legend axis')
    .attr('transform', `translate(${barWidth},0)`)
    .call(legendAxis);

  if (config.stanford_scaleFormat === 'pow10') {
    axis
      .selectAll('.tick text')
      .text(null)
      .filter(powerOfTen)
      .text(10)
      .append('tspan')
      .attr('dy', '-.7em') // https://bl.ocks.org/mbostock/6738229
      .text(function(d) {
        return Math.round(Math.log(d) / Math.LN10)
      });
  }

  $$.colorScale.attr(
    'transform',
    `translate(${$$.currentWidth - $$.xForColorScale()}, 0)`
  );
};

ChartInternal.prototype.xForColorScale = function() {
  var $$ = this;

  return $$.config.stanford_padding.right + getBBox($$.colorScale.node()).width
};

ChartInternal.prototype.getColorScalePadding = function() {
  var $$ = this;
  return $$.xForColorScale() + $$.config.stanford_padding.left + 20
};

ChartInternal.prototype.isStanfordGraphType = function() {
  var $$ = this;

  return $$.config.data_type === 'stanford'
};

ChartInternal.prototype.initStanfordData = function() {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    target = $$.data.targets[0],
    epochs,
    maxEpochs,
    minEpochs;

  // Make larger values appear on top
  target.values.sort(compareEpochs);

  // Get array of epochs
  epochs = target.values.map(a => a.epochs);

  minEpochs = !isNaN(config.stanford_scaleMin)
    ? config.stanford_scaleMin
    : d3.min(epochs);
  maxEpochs = !isNaN(config.stanford_scaleMax)
    ? config.stanford_scaleMax
    : d3.max(epochs);

  if (minEpochs > maxEpochs) {
    throw Error('Number of minEpochs has to be smaller than maxEpochs')
  }

  target.colors = isFunction(config.stanford_colors)
    ? config.stanford_colors
    : d3.interpolateHslLong(d3.hsl(250, 1, 0.5), d3.hsl(0, 1, 0.5));

  target.colorscale = d3
    .scaleSequentialLog(target.colors)
    .domain([minEpochs, maxEpochs]);

  target.minEpochs = minEpochs;
  target.maxEpochs = maxEpochs;
};

ChartInternal.prototype.getStanfordPointColor = function(d) {
  var $$ = this,
    target = $$.data.targets[0];

  return target.colorscale(d.epochs)
};

// http://jsfiddle.net/Xotic750/KtzLq/
ChartInternal.prototype.getCentroid = function(points) {
  var area = getRegionArea(points);

  var x = 0,
    y = 0,
    i,
    j,
    f,
    point1,
    point2;

  for (i = 0, j = points.length - 1; i < points.length; j = i, i += 1) {
    point1 = points[i];
    point2 = points[j];
    f = point1.x * point2.y - point2.x * point1.y;
    x += (point1.x + point2.x) * f;
    y += (point1.y + point2.y) * f;
  }

  f = area * 6;

  return {
    x: x / f,
    y: y / f
  }
};

ChartInternal.prototype.getStanfordTooltipTitle = function(d) {
  var $$ = this,
    labelX = $$.axis.getLabelText('x'),
    labelY = $$.axis.getLabelText('y');

  return `
      <tr><th>${labelX ? sanitise(labelX) : 'x'}</th><th class='value'>${
    d.x
  }</th></tr>
      <tr><th>${labelY ? sanitise(labelY) : 'y'}</th><th class='value'>${
    d.value
  }</th></tr>
    `
};

ChartInternal.prototype.countEpochsInRegion = function(region) {
  var $$ = this,
    target = $$.data.targets[0],
    total,
    count;

  total = target.values.reduce(
    (accumulator, currentValue) => accumulator + Number(currentValue.epochs),
    0
  );

  count = target.values.reduce((accumulator, currentValue) => {
    if (pointInRegion(currentValue, region)) {
      return accumulator + Number(currentValue.epochs)
    }

    return accumulator
  }, 0);

  return {
    value: count,
    percentage: count !== 0 ? ((count / total) * 100).toFixed(1) : 0
  }
};

var getRegionArea = function(points) {
  // thanks to: https://stackoverflow.com/questions/16282330/find-centerpoint-of-polygon-in-javascript
  var area = 0,
    i,
    j,
    point1,
    point2;

  for (i = 0, j = points.length - 1; i < points.length; j = i, i += 1) {
    point1 = points[i];
    point2 = points[j];
    area += point1.x * point2.y;
    area -= point1.y * point2.x;
  }

  area /= 2;

  return area
};

var pointInRegion = function(point, region) {
  // thanks to: http://bl.ocks.org/bycoffe/5575904
  // ray-casting algorithm based on
  // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
  let xi,
    yi,
    yj,
    xj,
    intersect,
    x = point.x,
    y = point.value,
    inside = false;

  for (let i = 0, j = region.length - 1; i < region.length; j = i++) {
    xi = region[i].x;
    yi = region[i].y;

    xj = region[j].x;
    yj = region[j].y;

    intersect = yi > y !== yj > y && x < ((xj - xi) * (y - yi)) / (yj - yi) + xi;

    if (intersect) {
      inside = !inside;
    }
  }

  return inside
};

var compareEpochs = function(a, b) {
  if (a.epochs < b.epochs) {
    return -1
  }
  if (a.epochs > b.epochs) {
    return 1
  }

  return 0
};

ChartInternal.prototype.initStanfordElements = function() {
  var $$ = this;

  // Avoid blocking eventRect
  $$.stanfordElements = $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.stanfordElements);

  $$.stanfordElements.append('g').attr('class', CLASS.stanfordLines);
  $$.stanfordElements.append('g').attr('class', CLASS.stanfordTexts);
  $$.stanfordElements.append('g').attr('class', CLASS.stanfordRegions);
};

ChartInternal.prototype.updateStanfordElements = function(duration) {
  var $$ = this,
    main = $$.main,
    config = $$.config,
    stanfordLine,
    stanfordLineEnter,
    stanfordRegion,
    stanfordRegionEnter,
    stanfordText,
    stanfordTextEnter,
    xvCustom = $$.xvCustom.bind($$),
    yvCustom = $$.yvCustom.bind($$),
    countPointsInRegion = $$.countEpochsInRegion.bind($$);

  // Stanford-Lines
  stanfordLine = main
    .select('.' + CLASS.stanfordLines)
    .style('shape-rendering', 'geometricprecision')
    .selectAll('.' + CLASS.stanfordLine)
    .data(config.stanford_lines);

  // enter
  stanfordLineEnter = stanfordLine
    .enter()
    .append('g')
    .attr('class', function(d) {
      return CLASS.stanfordLine + (d['class'] ? ' ' + d['class'] : '')
    });
  stanfordLineEnter
    .append('line')
    .attr('x1', d =>
      config.axis_rotated ? yvCustom(d, 'value_y1') : xvCustom(d, 'value_x1')
    )
    .attr('x2', d =>
      config.axis_rotated ? yvCustom(d, 'value_y2') : xvCustom(d, 'value_x2')
    )
    .attr('y1', d =>
      config.axis_rotated ? xvCustom(d, 'value_x1') : yvCustom(d, 'value_y1')
    )
    .attr('y2', d =>
      config.axis_rotated ? xvCustom(d, 'value_x2') : yvCustom(d, 'value_y2')
    )
    .style('opacity', 0);

  // update
  $$.stanfordLines = stanfordLineEnter.merge(stanfordLine);
  $$.stanfordLines
    .select('line')
    .transition()
    .duration(duration)
    .attr('x1', d =>
      config.axis_rotated ? yvCustom(d, 'value_y1') : xvCustom(d, 'value_x1')
    )
    .attr('x2', d =>
      config.axis_rotated ? yvCustom(d, 'value_y2') : xvCustom(d, 'value_x2')
    )
    .attr('y1', d =>
      config.axis_rotated ? xvCustom(d, 'value_x1') : yvCustom(d, 'value_y1')
    )
    .attr('y2', d =>
      config.axis_rotated ? xvCustom(d, 'value_x2') : yvCustom(d, 'value_y2')
    )
    .style('opacity', 1);

  // exit
  stanfordLine
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();

  // Stanford-Text
  stanfordText = main
    .select('.' + CLASS.stanfordTexts)
    .selectAll('.' + CLASS.stanfordText)
    .data(config.stanford_texts);

  // enter
  stanfordTextEnter = stanfordText
    .enter()
    .append('g')
    .attr('class', function(d) {
      return CLASS.stanfordText + (d['class'] ? ' ' + d['class'] : '')
    });
  stanfordTextEnter
    .append('text')
    .attr('x', d => (config.axis_rotated ? yvCustom(d, 'y') : xvCustom(d, 'x')))
    .attr('y', d => (config.axis_rotated ? xvCustom(d, 'x') : yvCustom(d, 'y')))
    .style('opacity', 0);

  // update
  $$.stanfordTexts = stanfordTextEnter.merge(stanfordText);
  $$.stanfordTexts
    .select('text')
    .transition()
    .duration(duration)
    .attr('x', d => (config.axis_rotated ? yvCustom(d, 'y') : xvCustom(d, 'x')))
    .attr('y', d => (config.axis_rotated ? xvCustom(d, 'x') : yvCustom(d, 'y')))
    .text(function(d) {
      return d.content
    })
    .style('opacity', 1);

  // exit
  stanfordText
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();

  // Stanford-Regions
  stanfordRegion = main
    .select('.' + CLASS.stanfordRegions)
    .selectAll('.' + CLASS.stanfordRegion)
    .data(config.stanford_regions);

  // enter
  stanfordRegionEnter = stanfordRegion
    .enter()
    .append('g')
    .attr('class', function(d) {
      return CLASS.stanfordRegion + (d['class'] ? ' ' + d['class'] : '')
    });
  stanfordRegionEnter
    .append('polygon')
    .attr('points', d => {
      return d.points
        .map(value => {
          return [
            config.axis_rotated ? yvCustom(value, 'y') : xvCustom(value, 'x'),
            config.axis_rotated ? xvCustom(value, 'x') : yvCustom(value, 'y')
          ].join(',')
        })
        .join(' ')
    })
    .style('opacity', 0);
  stanfordRegionEnter
    .append('text')
    .attr('x', d => $$.getCentroid(d.points).x)
    .attr('y', d => $$.getCentroid(d.points).y)
    .style('opacity', 0);

  // update
  $$.stanfordRegions = stanfordRegionEnter.merge(stanfordRegion);
  $$.stanfordRegions
    .select('polygon')
    .transition()
    .duration(duration)
    .attr('points', d => {
      return d.points
        .map(value => {
          return [
            config.axis_rotated ? yvCustom(value, 'y') : xvCustom(value, 'x'),
            config.axis_rotated ? xvCustom(value, 'x') : yvCustom(value, 'y')
          ].join(',')
        })
        .join(' ')
    })
    .style('opacity', d => {
      return d.opacity ? d.opacity : 0.2
    });
  $$.stanfordRegions
    .select('text')
    .transition()
    .duration(duration)
    .attr('x', d =>
      config.axis_rotated
        ? yvCustom($$.getCentroid(d.points), 'y')
        : xvCustom($$.getCentroid(d.points), 'x')
    )
    .attr('y', d =>
      config.axis_rotated
        ? xvCustom($$.getCentroid(d.points), 'x')
        : yvCustom($$.getCentroid(d.points), 'y')
    )
    .text(function(d) {
      if (d.text) {
        var value, percentage, temp;

        if ($$.isStanfordGraphType()) {
          temp = countPointsInRegion(d.points);
          value = temp.value;
          percentage = temp.percentage;
        }

        return d.text(value, percentage)
      }

      return ''
    })
    .attr('text-anchor', 'middle')
    .attr('dominant-baseline', 'middle')
    .style('opacity', 1);
  // exit
  stanfordRegion
    .exit()
    .transition()
    .duration(duration)
    .style('opacity', 0)
    .remove();
};

ChartInternal.prototype.initTooltip = function() {
  var $$ = this,
    config = $$.config,
    i;
  $$.tooltip = $$.selectChart
    .style('position', 'relative')
    .append('div')
    .attr('class', CLASS.tooltipContainer)
    .style('position', 'absolute')
    .style('pointer-events', 'none')
    .style('display', 'none');
  // Show tooltip if needed
  if (config.tooltip_init_show) {
    if ($$.isTimeSeries() && isString(config.tooltip_init_x)) {
      config.tooltip_init_x = $$.parseDate(config.tooltip_init_x);
      for (i = 0; i < $$.data.targets[0].values.length; i++) {
        if ($$.data.targets[0].values[i].x - config.tooltip_init_x === 0) {
          break
        }
      }
      config.tooltip_init_x = i;
    }
    $$.tooltip.html(
      config.tooltip_contents.call(
        $$,
        $$.data.targets.map(function(d) {
          return $$.addName(d.values[config.tooltip_init_x])
        }),
        $$.axis.getXAxisTickFormat(),
        $$.getYFormat($$.hasArcType()),
        $$.color
      )
    );
    $$.tooltip
      .style('top', config.tooltip_init_position.top)
      .style('left', config.tooltip_init_position.left)
      .style('display', 'block');
  }
};
ChartInternal.prototype.getTooltipSortFunction = function() {
  var $$ = this,
    config = $$.config;

  if (config.data_groups.length === 0 || config.tooltip_order !== undefined) {
    // if data are not grouped or if an order is specified
    // for the tooltip values we sort them by their values

    var order = config.tooltip_order;
    if (order === undefined) {
      order = config.data_order;
    }

    var valueOf = function(obj) {
      return obj ? obj.value : null
    };

    // if data are not grouped, we sort them by their value
    if (isString(order) && order.toLowerCase() === 'asc') {
      return function(a, b) {
        return valueOf(a) - valueOf(b)
      }
    } else if (isString(order) && order.toLowerCase() === 'desc') {
      return function(a, b) {
        return valueOf(b) - valueOf(a)
      }
    } else if (isFunction(order)) {
      // if the function is from data_order we need
      // to wrap the returned function in order to format
      // the sorted value to the expected format

      var sortFunction = order;

      if (config.tooltip_order === undefined) {
        sortFunction = function(a, b) {
          return order(
            a
              ? {
                  id: a.id,
                  values: [a]
                }
              : null,
            b
              ? {
                  id: b.id,
                  values: [b]
                }
              : null
          )
        };
      }

      return sortFunction
    } else if (isArray(order)) {
      return function(a, b) {
        return order.indexOf(a.id) - order.indexOf(b.id)
      }
    }
  } else {
    // if data are grouped, we follow the order of grouped targets
    var ids = $$.orderTargets($$.data.targets).map(function(i) {
      return i.id
    });

    // if it was either asc or desc we need to invert the order
    // returned by orderTargets
    if ($$.isOrderAsc() || $$.isOrderDesc()) {
      ids = ids.reverse();
    }

    return function(a, b) {
      return ids.indexOf(a.id) - ids.indexOf(b.id)
    }
  }
};
ChartInternal.prototype.getTooltipContent = function(
  d,
  defaultTitleFormat,
  defaultValueFormat,
  color
) {
  var $$ = this,
    config = $$.config,
    titleFormat = config.tooltip_format_title || defaultTitleFormat,
    nameFormat =
      config.tooltip_format_name ||
      function(name) {
        return name
      },
    text,
    i,
    title,
    value,
    name,
    bgcolor;

  var valueFormat = config.tooltip_format_value;
  if (!valueFormat) {
    valueFormat = $$.isTargetNormalized(d.id)
      ? (v, ratio) => `${(ratio * 100).toFixed(2)}%`
      : defaultValueFormat;
  }

  var tooltipSortFunction = this.getTooltipSortFunction();
  if (tooltipSortFunction) {
    d.sort(tooltipSortFunction);
  }

  for (i = 0; i < d.length; i++) {
    if (!(d[i] && (d[i].value || d[i].value === 0))) {
      continue
    }

    if ($$.isStanfordGraphType()) {
      // Custom tooltip for stanford plots
      if (!text) {
        title = $$.getStanfordTooltipTitle(d[i]);
        text = "<table class='" + $$.CLASS.tooltip + "'>" + title;
      }

      bgcolor = $$.getStanfordPointColor(d[i]);
      name = sanitise(config.data_epochs); // Epochs key name
      value = d[i].epochs;
    } else {
      // Regular tooltip
      if (!text) {
        title = sanitise(titleFormat ? titleFormat(d[i].x, d[i].index) : d[i].x);
        text =
          "<table class='" +
          $$.CLASS.tooltip +
          "'>" +
          (title || title === 0
            ? "<tr><th colspan='2'>" + title + '</th></tr>'
            : '');
      }

      value = sanitise(
        valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index, d)
      );
      if (value !== undefined) {
        // Skip elements when their name is set to null
        if (d[i].name === null) {
          continue
        }

        name = sanitise(nameFormat(d[i].name, d[i].ratio, d[i].id, d[i].index));
        bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
      }
    }

    if (value !== undefined) {
      text +=
        "<tr class='" +
        $$.CLASS.tooltipName +
        '-' +
        $$.getTargetSelectorSuffix(d[i].id) +
        "'>";
      text +=
        "<td class='name'><span style='background-color:" +
        bgcolor +
        "'></span>" +
        name +
        '</td>';
      text += "<td class='value'>" + value + '</td>';
      text += '</tr>';
    }
  }
  return text + '</table>'
};
ChartInternal.prototype.tooltipPosition = function(
  dataToShow,
  tWidth,
  tHeight,
  element
) {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3;
  var svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
  var forArc = $$.hasArcType(),
    mouse = d3.mouse(element);
  // Determin tooltip position
  if (forArc) {
    tooltipLeft =
      ($$.width - ($$.isLegendRight ? $$.getLegendWidth() : 0)) / 2 + mouse[0];
    tooltipTop =
      ($$.hasType('gauge') ? $$.height : $$.height / 2) + mouse[1] + 20;
  } else {
    svgLeft = $$.getSvgLeft(true);
    if (config.axis_rotated) {
      tooltipLeft = svgLeft + mouse[0] + 100;
      tooltipRight = tooltipLeft + tWidth;
      chartRight = $$.currentWidth - $$.getCurrentPaddingRight();
      tooltipTop = $$.x(dataToShow[0].x) + 20;
    } else {
      tooltipLeft =
        svgLeft + $$.getCurrentPaddingLeft(true) + $$.x(dataToShow[0].x) + 20;
      tooltipRight = tooltipLeft + tWidth;
      chartRight = svgLeft + $$.currentWidth - $$.getCurrentPaddingRight();
      tooltipTop = mouse[1] + 15;
    }

    if (tooltipRight > chartRight) {
      // 20 is needed for Firefox to keep tooltip width
      tooltipLeft -= tooltipRight - chartRight + 20;
    }
    if (tooltipTop + tHeight > $$.currentHeight) {
      tooltipTop -= tHeight + 30;
    }
  }
  if (tooltipTop < 0) {
    tooltipTop = 0;
  }
  return {
    top: tooltipTop,
    left: tooltipLeft
  }
};
ChartInternal.prototype.showTooltip = function(selectedData, element) {
  var $$ = this,
    config = $$.config;
  var tWidth, tHeight, position;
  var forArc = $$.hasArcType(),
    dataToShow = selectedData.filter(function(d) {
      return d && isValue(d.value)
    }),
    positionFunction =
      config.tooltip_position || ChartInternal.prototype.tooltipPosition;
  if (dataToShow.length === 0 || !config.tooltip_show) {
    $$.hideTooltip();
    return
  }
  $$.tooltip
    .html(
      config.tooltip_contents.call(
        $$,
        selectedData,
        $$.axis.getXAxisTickFormat(),
        $$.getYFormat(forArc),
        $$.color
      )
    )
    .style('display', 'block');

  // Get tooltip dimensions
  tWidth = $$.tooltip.property('offsetWidth');
  tHeight = $$.tooltip.property('offsetHeight');

  position = positionFunction.call(this, dataToShow, tWidth, tHeight, element);
  // Set tooltip
  $$.tooltip
    .style('top', position.top + 'px')
    .style('left', position.left + 'px');
};
ChartInternal.prototype.hideTooltip = function() {
  this.tooltip.style('display', 'none');
};

ChartInternal.prototype.setTargetType = function(targetIds, type) {
  var $$ = this,
    config = $$.config;
  $$.mapToTargetIds(targetIds).forEach(function(id) {
    $$.withoutFadeIn[id] = type === config.data_types[id];
    config.data_types[id] = type;
  });
  if (!targetIds) {
    config.data_type = type;
  }
};
ChartInternal.prototype.hasType = function(type, targets) {
  var $$ = this,
    types = $$.config.data_types,
    has = false;
  targets = targets || $$.data.targets;
  if (targets && targets.length) {
    targets.forEach(function(target) {
      var t = types[target.id];
      if ((t && t.indexOf(type) >= 0) || (!t && type === 'line')) {
        has = true;
      }
    });
  } else if (Object.keys(types).length) {
    Object.keys(types).forEach(function(id) {
      if (types[id] === type) {
        has = true;
      }
    });
  } else {
    has = $$.config.data_type === type;
  }
  return has
};
ChartInternal.prototype.hasArcType = function(targets) {
  return (
    this.hasType('pie', targets) ||
    this.hasType('donut', targets) ||
    this.hasType('gauge', targets)
  )
};
ChartInternal.prototype.isLineType = function(d) {
  var config = this.config,
    id = isString(d) ? d : d.id;
  return (
    !config.data_types[id] ||
    ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(
      config.data_types[id]
    ) >= 0
  )
};
ChartInternal.prototype.isStepType = function(d) {
  var id = isString(d) ? d : d.id;
  return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0
};
ChartInternal.prototype.isSplineType = function(d) {
  var id = isString(d) ? d : d.id;
  return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0
};
ChartInternal.prototype.isAreaType = function(d) {
  var id = isString(d) ? d : d.id;
  return (
    ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >=
    0
  )
};
ChartInternal.prototype.isBarType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'bar'
};
ChartInternal.prototype.isScatterType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'scatter'
};
ChartInternal.prototype.isStanfordType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'stanford'
};
ChartInternal.prototype.isPieType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'pie'
};
ChartInternal.prototype.isGaugeType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'gauge'
};
ChartInternal.prototype.isDonutType = function(d) {
  var id = isString(d) ? d : d.id;
  return this.config.data_types[id] === 'donut'
};
ChartInternal.prototype.isArcType = function(d) {
  return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d)
};
ChartInternal.prototype.lineData = function(d) {
  return this.isLineType(d) ? [d] : []
};
ChartInternal.prototype.arcData = function(d) {
  return this.isArcType(d.data) ? [d] : []
};
/* not used
 function scatterData(d) {
 return isScatterType(d) ? d.values : [];
 }
 */
ChartInternal.prototype.barData = function(d) {
  return this.isBarType(d) ? d.values : []
};
ChartInternal.prototype.lineOrScatterOrStanfordData = function(d) {
  return this.isLineType(d) || this.isScatterType(d) || this.isStanfordType(d)
    ? d.values
    : []
};
ChartInternal.prototype.barOrLineData = function(d) {
  return this.isBarType(d) || this.isLineType(d) ? d.values : []
};

ChartInternal.prototype.isSafari = function() {
  var ua = window.navigator.userAgent;
  return ua.indexOf('Safari') >= 0 && ua.indexOf('Chrome') < 0
};
ChartInternal.prototype.isChrome = function() {
  var ua = window.navigator.userAgent;
  return ua.indexOf('Chrome') >= 0
};

ChartInternal.prototype.initZoom = function() {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    startEvent;

  $$.zoom = d3
    .zoom()
    .on('start', function() {
      if (config.zoom_type !== 'scroll') {
        return
      }

      var e = d3.event.sourceEvent;
      if (e && e.type === 'brush') {
        return
      }
      startEvent = e;
      config.zoom_onzoomstart.call($$.api, e);
    })
    .on('zoom', function() {
      if (config.zoom_type !== 'scroll') {
        return
      }

      var e = d3.event.sourceEvent;
      if (e && e.type === 'brush') {
        return
      }

      $$.redrawForZoom();

      config.zoom_onzoom.call($$.api, $$.x.orgDomain());
    })
    .on('end', function() {
      if (config.zoom_type !== 'scroll') {
        return
      }

      var e = d3.event.sourceEvent;
      if (e && e.type === 'brush') {
        return
      }
      // if click, do nothing. otherwise, click interaction will be canceled.
      if (
        e &&
        startEvent.clientX === e.clientX &&
        startEvent.clientY === e.clientY
      ) {
        return
      }
      config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
    });

  $$.zoom.updateDomain = function() {
    if (d3.event && d3.event.transform) {
      $$.x.domain(d3.event.transform.rescaleX($$.subX).domain());
    }
    return this
  };
  $$.zoom.updateExtent = function() {
    this.scaleExtent([1, Infinity])
      .translateExtent([
        [0, 0],
        [$$.width, $$.height]
      ])
      .extent([
        [0, 0],
        [$$.width, $$.height]
      ]);
    return this
  };
  $$.zoom.update = function() {
    return this.updateExtent().updateDomain()
  };

  return $$.zoom.updateExtent()
};
ChartInternal.prototype.zoomTransform = function(range) {
  var $$ = this,
    s = [$$.x(range[0]), $$.x(range[1])];
  return $$.d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0)
};

ChartInternal.prototype.initDragZoom = function() {
  const $$ = this;
  const d3 = $$.d3;
  const config = $$.config;
  const context = ($$.context = $$.svg);
  const brushXPos = $$.margin.left + 20.5;
  const brushYPos = $$.margin.top + 0.5;

  if (!(config.zoom_type === 'drag' && config.zoom_enabled)) {
    return
  }

  const getZoomedDomain = selection =>
    selection && selection.map(x => $$.x.invert(x));

  const brush = ($$.dragZoomBrush = d3
    .brushX()
    .on('start', () => {
      $$.api.unzoom();

      $$.svg.select('.' + CLASS.dragZoom).classed('disabled', false);

      config.zoom_onzoomstart.call($$.api, d3.event.sourceEvent);
    })
    .on('brush', () => {
      config.zoom_onzoom.call($$.api, getZoomedDomain(d3.event.selection));
    })
    .on('end', () => {
      if (d3.event.selection == null) {
        return
      }

      const zoomedDomain = getZoomedDomain(d3.event.selection);

      if (!config.zoom_disableDefaultBehavior) {
        $$.api.zoom(zoomedDomain);
      }

      $$.svg.select('.' + CLASS.dragZoom).classed('disabled', true);

      config.zoom_onzoomend.call($$.api, zoomedDomain);
    }));

  context
    .append('g')
    .classed(CLASS.dragZoom, true)
    .attr('clip-path', $$.clipPath)
    .attr('transform', 'translate(' + brushXPos + ',' + brushYPos + ')')
    .call(brush);
};

ChartInternal.prototype.getZoomDomain = function() {
  var $$ = this,
    config = $$.config,
    d3 = $$.d3,
    min = d3.min([$$.orgXDomain[0], config.zoom_x_min]),
    max = d3.max([$$.orgXDomain[1], config.zoom_x_max]);
  return [min, max]
};
ChartInternal.prototype.redrawForZoom = function() {
  var $$ = this,
    d3 = $$.d3,
    config = $$.config,
    zoom = $$.zoom,
    x = $$.x;
  if (!config.zoom_enabled) {
    return
  }
  if ($$.filterTargetsToShow($$.data.targets).length === 0) {
    return
  }

  zoom.update();

  if (config.zoom_disableDefaultBehavior) {
    return
  }

  if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
    x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
  }

  $$.redraw({
    withTransition: false,
    withY: config.zoom_rescale,
    withSubchart: false,
    withEventRect: false,
    withDimension: false
  });

  if (d3.event.sourceEvent && d3.event.sourceEvent.type === 'mousemove') {
    $$.cancelClick = true;
  }
};

return c3;
};