/
DataLabels.js
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/
DataLabels.js
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/**
* (c) 2010-2019 Torstein Honsi
*
* License: www.highcharts.com/license
*/
'use strict';
import H from './Globals.js';
import './Utilities.js';
import './Series.js';
var addEvent = H.addEvent,
arrayMax = H.arrayMax,
defined = H.defined,
extend = H.extend,
format = H.format,
merge = H.merge,
noop = H.noop,
pick = H.pick,
relativeLength = H.relativeLength,
Series = H.Series,
seriesTypes = H.seriesTypes,
stableSort = H.stableSort,
isArray = H.isArray,
splat = H.splat;
/**
* General distribution algorithm for distributing labels of differing size
* along a confined length in two dimensions. The algorithm takes an array of
* objects containing a size, a target and a rank. It will place the labels as
* close as possible to their targets, skipping the lowest ranked labels if
* necessary.
*
* @private
* @function Highcharts.distribute
*
* @param {Array<object>} boxes
*
* @param {number} len
*
* @param {number} maxDistance
*/
H.distribute = function (boxes, len, maxDistance) {
var i,
overlapping = true,
origBoxes = boxes, // Original array will be altered with added .pos
restBoxes = [], // The outranked overshoot
box,
target,
total = 0,
reducedLen = origBoxes.reducedLen || len;
function sortByTarget(a, b) {
return a.target - b.target;
}
// If the total size exceeds the len, remove those boxes with the lowest
// rank
i = boxes.length;
while (i--) {
total += boxes[i].size;
}
// Sort by rank, then slice away overshoot
if (total > reducedLen) {
stableSort(boxes, function (a, b) {
return (b.rank || 0) - (a.rank || 0);
});
i = 0;
total = 0;
while (total <= reducedLen) {
total += boxes[i].size;
i++;
}
restBoxes = boxes.splice(i - 1, boxes.length);
}
// Order by target
stableSort(boxes, sortByTarget);
// So far we have been mutating the original array. Now
// create a copy with target arrays
boxes = boxes.map(function (box) {
return {
size: box.size,
targets: [box.target],
align: pick(box.align, 0.5)
};
});
while (overlapping) {
// Initial positions: target centered in box
i = boxes.length;
while (i--) {
box = boxes[i];
// Composite box, average of targets
target = (
Math.min.apply(0, box.targets) +
Math.max.apply(0, box.targets)
) / 2;
box.pos = Math.min(
Math.max(0, target - box.size * box.align),
len - box.size
);
}
// Detect overlap and join boxes
i = boxes.length;
overlapping = false;
while (i--) {
// Overlap
if (i > 0 && boxes[i - 1].pos + boxes[i - 1].size > boxes[i].pos) {
// Add this size to the previous box
boxes[i - 1].size += boxes[i].size;
boxes[i - 1].targets = boxes[i - 1]
.targets
.concat(boxes[i].targets);
boxes[i - 1].align = 0.5;
// Overlapping right, push left
if (boxes[i - 1].pos + boxes[i - 1].size > len) {
boxes[i - 1].pos = len - boxes[i - 1].size;
}
boxes.splice(i, 1); // Remove this item
overlapping = true;
}
}
}
// Add the rest (hidden boxes)
origBoxes.push.apply(origBoxes, restBoxes);
// Now the composite boxes are placed, we need to put the original boxes
// within them
i = 0;
boxes.some(function (box) {
var posInCompositeBox = 0;
if (box.targets.some(function () {
origBoxes[i].pos = box.pos + posInCompositeBox;
// If the distance between the position and the target exceeds
// maxDistance, abort the loop and decrease the length in increments
// of 10% to recursively reduce the number of visible boxes by
// rank. Once all boxes are within the maxDistance, we're good.
if (
Math.abs(origBoxes[i].pos - origBoxes[i].target) >
maxDistance
) {
// Reset the positions that are already set
origBoxes.slice(0, i + 1).forEach(function (box) {
delete box.pos;
});
// Try with a smaller length
origBoxes.reducedLen =
(origBoxes.reducedLen || len) - (len * 0.1);
// Recurse
if (origBoxes.reducedLen > len * 0.1) {
H.distribute(origBoxes, len, maxDistance);
}
// Exceeded maxDistance => abort
return true;
}
posInCompositeBox += origBoxes[i].size;
i++;
})) {
// Exceeded maxDistance => abort
return true;
}
});
// Add the rest (hidden) boxes and sort by target
stableSort(origBoxes, sortByTarget);
};
/**
* Draw the data labels
*
* @private
* @function Highcharts.Series#drawDataLabels
*
* @fires Highcharts.Series#event:afterDrawDataLabels
*/
Series.prototype.drawDataLabels = function () {
var series = this,
chart = series.chart,
seriesOptions = series.options,
seriesDlOptions = seriesOptions.dataLabels,
points = series.points,
pointOptions,
hasRendered = series.hasRendered || 0,
dataLabelsGroup,
defer = pick(seriesDlOptions.defer, !!seriesOptions.animation),
renderer = chart.renderer;
/*
* Handle the dataLabels.filter option.
*/
function applyFilter(point, options) {
var filter = options.filter,
op,
prop,
val;
if (filter) {
op = filter.operator;
prop = point[filter.property];
val = filter.value;
if (
(op === '>' && prop > val) ||
(op === '<' && prop < val) ||
(op === '>=' && prop >= val) ||
(op === '<=' && prop <= val) ||
(op === '==' && prop == val) || // eslint-disable-line eqeqeq
(op === '===' && prop === val)
) {
return true;
}
return false;
}
return true;
}
/*
* Merge two objects that can be arrays. If one of them is an array, the
* other is merged into each element. If both are arrays, each element is
* merged by index. If neither are arrays, we use normal merge.
*/
function mergeArrays(one, two) {
var res = [],
i;
if (isArray(one) && !isArray(two)) {
res = one.map(function (el) {
return merge(el, two);
});
} else if (isArray(two) && !isArray(one)) {
res = two.map(function (el) {
return merge(one, el);
});
} else if (!isArray(one) && !isArray(two)) {
res = merge(one, two);
} else {
i = Math.max(one.length, two.length);
while (i--) {
res[i] = merge(one[i], two[i]);
}
}
return res;
}
// Merge in plotOptions.dataLabels for series
seriesDlOptions = mergeArrays(
mergeArrays(
chart.options.plotOptions &&
chart.options.plotOptions.series &&
chart.options.plotOptions.series.dataLabels,
chart.options.plotOptions &&
chart.options.plotOptions[series.type] &&
chart.options.plotOptions[series.type].dataLabels
),
seriesDlOptions
);
H.fireEvent(this, 'drawDataLabels');
if (
isArray(seriesDlOptions) ||
seriesDlOptions.enabled ||
series._hasPointLabels
) {
// Create a separate group for the data labels to avoid rotation
dataLabelsGroup = series.plotGroup(
'dataLabelsGroup',
'data-labels',
defer && !hasRendered ? 'hidden' : 'visible', // #5133
seriesDlOptions.zIndex || 6
);
if (defer) {
dataLabelsGroup.attr({ opacity: +hasRendered }); // #3300
if (!hasRendered) {
addEvent(series, 'afterAnimate', function () {
if (series.visible) { // #2597, #3023, #3024
dataLabelsGroup.show(true);
}
dataLabelsGroup[
seriesOptions.animation ? 'animate' : 'attr'
]({ opacity: 1 }, { duration: 200 });
});
}
}
// Make the labels for each point
points.forEach(function (point) {
// Merge in series options for the point.
// @note dataLabelAttribs (like pointAttribs) would eradicate
// the need for dlOptions, and simplify the section below.
pointOptions = splat(
mergeArrays(
seriesDlOptions,
point.dlOptions || // dlOptions is used in treemaps
(point.options && point.options.dataLabels)
)
);
// Handle each individual data label for this point
pointOptions.forEach(function (labelOptions, i) {
// Options for one datalabel
var labelEnabled = labelOptions.enabled &&
!point.isNull && // #2282, #4641, #7112
applyFilter(point, labelOptions),
labelConfig,
formatString,
labelText,
style,
rotation,
attr,
dataLabel = point.dataLabels ? point.dataLabels[i] :
point.dataLabel,
connector = point.connectors ? point.connectors[i] :
point.connector,
isNew = !dataLabel;
if (labelEnabled) {
// Create individual options structure that can be extended
// without affecting others
labelConfig = point.getLabelConfig();
formatString = (
labelOptions[point.formatPrefix + 'Format'] ||
labelOptions.format
);
labelText = defined(formatString) ?
format(formatString, labelConfig, chart.time) :
(
labelOptions[point.formatPrefix + 'Formatter'] ||
labelOptions.formatter
).call(labelConfig, labelOptions);
style = labelOptions.style;
rotation = labelOptions.rotation;
if (!chart.styledMode) {
// Determine the color
style.color = pick(
labelOptions.color,
style.color,
series.color,
'${palette.neutralColor100}'
);
// Get automated contrast color
if (style.color === 'contrast') {
point.contrastColor = renderer.getContrast(
point.color || series.color
);
style.color = labelOptions.inside ||
pick(
labelOptions.distance,
point.labelDistance
) < 0 ||
!!seriesOptions.stacking ?
point.contrastColor :
'${palette.neutralColor100}';
}
if (seriesOptions.cursor) {
style.cursor = seriesOptions.cursor;
}
}
attr = {
r: labelOptions.borderRadius || 0,
rotation: rotation,
padding: labelOptions.padding,
zIndex: 1
};
if (!chart.styledMode) {
attr.fill = labelOptions.backgroundColor;
attr.stroke = labelOptions.borderColor;
attr['stroke-width'] = labelOptions.borderWidth;
}
// Remove unused attributes (#947)
H.objectEach(attr, function (val, name) {
if (val === undefined) {
delete attr[name];
}
});
}
// If the point is outside the plot area, destroy it. #678, #820
if (dataLabel && (!labelEnabled || !defined(labelText))) {
point.dataLabel =
point.dataLabel && point.dataLabel.destroy();
if (point.dataLabels) {
// Remove point.dataLabels if this was the last one
if (point.dataLabels.length === 1) {
delete point.dataLabels;
} else {
delete point.dataLabels[i];
}
}
if (!i) {
delete point.dataLabel;
}
if (connector) {
point.connector = point.connector.destroy();
if (point.connectors) {
// Remove point.connectors if this was the last one
if (point.connectors.length === 1) {
delete point.connectors;
} else {
delete point.connectors[i];
}
}
}
// Individual labels are disabled if the are explicitly disabled
// in the point options, or if they fall outside the plot area.
} else if (labelEnabled && defined(labelText)) {
if (!dataLabel) {
// Create new label element
point.dataLabels = point.dataLabels || [];
dataLabel = point.dataLabels[i] = rotation ?
// Labels don't rotate, use text element
renderer.text(labelText, 0, -9999)
.addClass('highcharts-data-label') :
// We can use label
renderer.label(
labelText,
0,
-9999,
labelOptions.shape,
null,
null,
labelOptions.useHTML,
null,
'data-label'
);
// Store for backwards compatibility
if (!i) {
point.dataLabel = dataLabel;
}
dataLabel.addClass(
' highcharts-data-label-color-' + point.colorIndex +
' ' + (labelOptions.className || '') +
( // #3398
labelOptions.useHTML ?
' highcharts-tracker' :
''
)
);
} else {
// Use old element and just update text
attr.text = labelText;
}
// Store data label options for later access
dataLabel.options = labelOptions;
dataLabel.attr(attr);
if (!chart.styledMode) {
// Styles must be applied before add in order to read
// text bounding box
dataLabel.css(style).shadow(labelOptions.shadow);
}
if (!dataLabel.added) {
dataLabel.add(dataLabelsGroup);
}
// Now the data label is created and placed at 0,0, so we
// need to align it
series.alignDataLabel(
point, dataLabel, labelOptions, null, isNew
);
}
});
});
}
H.fireEvent(this, 'afterDrawDataLabels');
};
/**
* Align each individual data label.
*
* @private
* @function Highcharts.Series#alignDataLabel
*
* @param {Highcharts.Point} point
*
* @param {Highcharts.SVGElement} dataLabel
*
* @param {Highcharts.PlotSeriesDataLabelsOptions} options
*
* @param {Highcharts.BBoxObject} alignTo
*
* @param {boolean} isNew
*/
Series.prototype.alignDataLabel = function (
point,
dataLabel,
options,
alignTo,
isNew
) {
var chart = this.chart,
inverted = this.isCartesian && chart.inverted,
plotX = pick(point.dlBox && point.dlBox.centerX, point.plotX, -9999),
plotY = pick(point.plotY, -9999),
bBox = dataLabel.getBBox(),
baseline,
rotation = options.rotation,
normRotation,
negRotation,
align = options.align,
rotCorr, // rotation correction
// Math.round for rounding errors (#2683), alignTo to allow column
// labels (#2700)
visible =
this.visible &&
(
point.series.forceDL ||
chart.isInsidePlot(plotX, Math.round(plotY), inverted) ||
(
alignTo && chart.isInsidePlot(
plotX,
inverted ?
alignTo.x + 1 :
alignTo.y + alignTo.height - 1,
inverted
)
)
),
alignAttr, // the final position;
justify = pick(options.overflow, 'justify') === 'justify';
if (visible) {
baseline = chart.renderer.fontMetrics(
chart.styledMode ? undefined : options.style.fontSize,
dataLabel
).b;
// The alignment box is a singular point
alignTo = extend({
x: inverted ? this.yAxis.len - plotY : plotX,
y: Math.round(inverted ? this.xAxis.len - plotX : plotY),
width: 0,
height: 0
}, alignTo);
// Add the text size for alignment calculation
extend(options, {
width: bBox.width,
height: bBox.height
});
// Allow a hook for changing alignment in the last moment, then do the
// alignment
if (rotation) {
justify = false; // Not supported for rotated text
rotCorr = chart.renderer.rotCorr(baseline, rotation); // #3723
alignAttr = {
x: alignTo.x + options.x + alignTo.width / 2 + rotCorr.x,
y: (
alignTo.y +
options.y +
{ top: 0, middle: 0.5, bottom: 1 }[options.verticalAlign] *
alignTo.height
)
};
dataLabel[isNew ? 'attr' : 'animate'](alignAttr)
.attr({ // #3003
align: align
});
// Compensate for the rotated label sticking out on the sides
normRotation = (rotation + 720) % 360;
negRotation = normRotation > 180 && normRotation < 360;
if (align === 'left') {
alignAttr.y -= negRotation ? bBox.height : 0;
} else if (align === 'center') {
alignAttr.x -= bBox.width / 2;
alignAttr.y -= bBox.height / 2;
} else if (align === 'right') {
alignAttr.x -= bBox.width;
alignAttr.y -= negRotation ? 0 : bBox.height;
}
dataLabel.placed = true;
dataLabel.alignAttr = alignAttr;
} else {
dataLabel.align(options, null, alignTo);
alignAttr = dataLabel.alignAttr;
}
// Handle justify or crop
if (justify && alignTo.height >= 0) { // #8830
point.isLabelJustified = this.justifyDataLabel(
dataLabel,
options,
alignAttr,
bBox,
alignTo,
isNew
);
// Now check that the data label is within the plot area
} else if (pick(options.crop, true)) {
visible =
chart.isInsidePlot(
alignAttr.x,
alignAttr.y
) &&
chart.isInsidePlot(
alignAttr.x + bBox.width,
alignAttr.y + bBox.height
);
}
// When we're using a shape, make it possible with a connector or an
// arrow pointing to thie point
if (options.shape && !rotation) {
dataLabel[isNew ? 'attr' : 'animate']({
anchorX: inverted ? chart.plotWidth - point.plotY : point.plotX,
anchorY: inverted ? chart.plotHeight - point.plotX : point.plotY
});
}
}
// Show or hide based on the final aligned position
if (!visible) {
dataLabel.attr({ y: -9999 });
dataLabel.placed = false; // don't animate back in
}
};
/**
* If data labels fall partly outside the plot area, align them back in, in a
* way that doesn't hide the point.
*
* @private
* @function Highcharts.Series#justifyDataLabel
*
* @param {Highcharts.SVGElement} dataLabel
*
* @param {Highcharts.PlotSeriesDataLabelsOptions} options
*
* @param {*} alignAttr
*
* @param {Highcharts.BBoxObject} bBox
*
* @param {boolean} isNew
*
* @return {boolean}
*/
Series.prototype.justifyDataLabel = function (
dataLabel,
options,
alignAttr,
bBox,
alignTo,
isNew
) {
var chart = this.chart,
align = options.align,
verticalAlign = options.verticalAlign,
off,
justified,
padding = dataLabel.box ? 0 : (dataLabel.padding || 0);
// Off left
off = alignAttr.x + padding;
if (off < 0) {
if (align === 'right') {
options.align = 'left';
} else {
options.x = -off;
}
justified = true;
}
// Off right
off = alignAttr.x + bBox.width - padding;
if (off > chart.plotWidth) {
if (align === 'left') {
options.align = 'right';
} else {
options.x = chart.plotWidth - off;
}
justified = true;
}
// Off top
off = alignAttr.y + padding;
if (off < 0) {
if (verticalAlign === 'bottom') {
options.verticalAlign = 'top';
} else {
options.y = -off;
}
justified = true;
}
// Off bottom
off = alignAttr.y + bBox.height - padding;
if (off > chart.plotHeight) {
if (verticalAlign === 'top') {
options.verticalAlign = 'bottom';
} else {
options.y = chart.plotHeight - off;
}
justified = true;
}
if (justified) {
dataLabel.placed = !isNew;
dataLabel.align(options, null, alignTo);
}
return justified;
};
if (seriesTypes.pie) {
seriesTypes.pie.prototype.dataLabelPositioners = {
// Based on the value computed in Highcharts' distribute algorithm.
radialDistributionY: function (point) {
return point.top + point.distributeBox.pos;
},
// get the x - use the natural x position for labels near the
// top and bottom, to prevent the top and botton slice
// connectors from touching each other on either side
// Based on the value computed in Highcharts' distribute algorithm.
radialDistributionX: function (series, point, y, naturalY) {
return series.getX(
y < point.top + 2 || y > point.bottom - 2 ?
naturalY :
y,
point.half,
point
);
},
// dataLabels.distance determines the x position of the label
justify: function (point, radius, seriesCenter) {
return seriesCenter[0] + (point.half ? -1 : 1) *
(radius + point.labelDistance);
},
// Left edges of the left-half labels touch the left edge of the plot
// area. Right edges of the right-half labels touch the right edge of
// the plot area.
alignToPlotEdges: function (
dataLabel,
half,
plotWidth,
plotLeft
) {
var dataLabelWidth = dataLabel.getBBox().width;
return half ? dataLabelWidth + plotLeft :
plotWidth - dataLabelWidth - plotLeft;
},
// Connectors of each side end in the same x position. Labels are
// aligned to them. Left edge of the widest left-half label touches the
// left edge of the plot area. Right edge of the widest right-half label
// touches the right edge of the plot area.
alignToConnectors: function (
points,
half,
plotWidth,
plotLeft
) {
var maxDataLabelWidth = 0,
dataLabelWidth;
// find widest data label
points.forEach(function (point) {
dataLabelWidth = point.dataLabel.getBBox().width;
if (dataLabelWidth > maxDataLabelWidth) {
maxDataLabelWidth = dataLabelWidth;
}
});
return half ? maxDataLabelWidth + plotLeft :
plotWidth - maxDataLabelWidth - plotLeft;
}
};
/**
* Override the base drawDataLabels method by pie specific functionality
*
* @private
* @function Highcharts.seriesTypes.pie#drawDataLabels
*/
seriesTypes.pie.prototype.drawDataLabels = function () {
var series = this,
data = series.data,
point,
chart = series.chart,
options = series.options.dataLabels,
connectorPadding = options.connectorPadding,
connectorWidth = pick(options.connectorWidth, 1),
plotWidth = chart.plotWidth,
plotHeight = chart.plotHeight,
plotLeft = chart.plotLeft,
maxWidth = Math.round(chart.chartWidth / 3),
connector,
seriesCenter = series.center,
radius = seriesCenter[2] / 2,
centerY = seriesCenter[1],
dataLabel,
dataLabelWidth,
// labelPos,
labelPosition,
labelHeight,
// divide the points into right and left halves for anti collision
halves = [
[], // right
[] // left
],
x,
y,
visibility,
j,
overflow = [0, 0, 0, 0], // top, right, bottom, left
dataLabelPositioners = series.dataLabelPositioners;
// get out if not enabled
if (!series.visible || (!options.enabled && !series._hasPointLabels)) {
return;
}
// Reset all labels that have been shortened
data.forEach(function (point) {
if (point.dataLabel && point.visible && point.dataLabel.shortened) {
point.dataLabel
.attr({
width: 'auto'
}).css({
width: 'auto',
textOverflow: 'clip'
});
point.dataLabel.shortened = false;
}
});
// run parent method
Series.prototype.drawDataLabels.apply(series);
data.forEach(function (point) {
if (point.dataLabel) {
if (point.visible) { // #407, #2510
// Arrange points for detection collision
halves[point.half].push(point);
// Reset positions (#4905)
point.dataLabel._pos = null;
// Avoid long labels squeezing the pie size too far down
if (
!defined(options.style.width) &&
!defined(
point.options.dataLabels &&
point.options.dataLabels.style &&
point.options.dataLabels.style.width
)
) {
if (point.dataLabel.getBBox().width > maxWidth) {
point.dataLabel.css({
// Use a fraction of the maxWidth to avoid
// wrapping close to the end of the string.
width: maxWidth * 0.7
});
point.dataLabel.shortened = true;
}
}
} else {
point.dataLabel = point.dataLabel.destroy();
// Workaround to make pies destroy multiple datalabels
// correctly. This logic needs rewriting to support multiple
// datalabels fully.
if (point.dataLabels && point.dataLabels.length === 1) {
delete point.dataLabels;
}
}
}
});
/* Loop over the points in each half, starting from the top and bottom
* of the pie to detect overlapping labels.
*/
halves.forEach(function (points, i) {
var top,
bottom,
length = points.length,
positions = [],
naturalY,
sideOverflow,
size,
distributionLength;
if (!length) {
return;
}
// Sort by angle
series.sortByAngle(points, i - 0.5);
// Only do anti-collision when we have dataLabels outside the pie
// and have connectors. (#856)
if (series.maxLabelDistance > 0) {
top = Math.max(
0,
centerY - radius - series.maxLabelDistance
);
bottom = Math.min(
centerY + radius + series.maxLabelDistance,
chart.plotHeight
);
points.forEach(function (point) {
// check if specific points' label is outside the pie
if (point.labelDistance > 0 && point.dataLabel) {
// point.top depends on point.labelDistance value
// Used for calculation of y value in getX method
point.top = Math.max(
0,
centerY - radius - point.labelDistance
);
point.bottom = Math.min(
centerY + radius + point.labelDistance,
chart.plotHeight
);
size = point.dataLabel.getBBox().height || 21;
// point.positionsIndex is needed for getting index of
// parameter related to specific point inside positions
// array - not every point is in positions array.
point.distributeBox = {
target: point.labelPosition.natural.y -
point.top + size / 2,
size: size,
rank: point.y
};
positions.push(point.distributeBox);
}
});
distributionLength = bottom + size - top;
H.distribute(
positions,
distributionLength,
distributionLength / 5
);
}
// Now the used slots are sorted, fill them up sequentially
for (j = 0; j < length; j++) {
point = points[j];
// labelPos = point.labelPos;
labelPosition = point.labelPosition;
dataLabel = point.dataLabel;
visibility = point.visible === false ? 'hidden' : 'inherit';
naturalY = labelPosition.natural.y;
y = naturalY;
if (positions && defined(point.distributeBox)) {
if (point.distributeBox.pos === undefined) {
visibility = 'hidden';
} else {
labelHeight = point.distributeBox.size;