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wxcharts.js
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wxcharts.js
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/*
* charts for WeChat small app v1.0
*
* https://github.com/xiaolin3303/wx-charts
* 2016-11-28
*
* Designed and built with all the love of Web
*/
'use strict';
var config = {
yAxisWidth: 15,
yAxisSplit: 5,
xAxisHeight: 15,
xAxisLineHeight: 15,
legendHeight: 15,
yAxisTitleWidth: 15,
padding: 12,
columePadding: 3,
fontSize: 10,
dataPointShape: ['diamond', 'circle', 'triangle', 'rect'],
colors: ['#7cb5ec', '#f7a35c', '#434348', '#90ed7d', '#f15c80', '#8085e9'],
pieChartLinePadding: 25,
pieChartTextPadding: 15,
xAxisTextPadding: 3,
titleColor: '#333333',
titleFontSize: 20,
subtitleColor: '#999999',
subtitleFontSize: 15,
toolTipPadding: 3,
toolTipBackground: '#000000',
toolTipOpacity: 0.7,
toolTipLineHeight: 14,
radarGridCount: 3,
radarLabelTextMargin: 15
};
// Object.assign polyfill
// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
function assign(target, varArgs) {
if (target == null) {
// TypeError if undefined or null
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) {
// Skip over if undefined or null
for (var nextKey in nextSource) {
// Avoid bugs when hasOwnProperty is shadowed
if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
to[nextKey] = nextSource[nextKey];
}
}
}
}
return to;
}
var util = {
toFixed: function toFixed(num, limit) {
limit = limit || 2;
if (this.isFloat(num)) {
num = num.toFixed(limit);
}
return num;
},
isFloat: function isFloat(num) {
return num % 1 !== 0;
},
approximatelyEqual: function approximatelyEqual(num1, num2) {
return Math.abs(num1 - num2) < 1e-10;
},
isSameSign: function isSameSign(num1, num2) {
return Math.abs(num1) === num1 && Math.abs(num2) === num2 || Math.abs(num1) !== num1 && Math.abs(num2) !== num2;
},
isSameXCoordinateArea: function isSameXCoordinateArea(p1, p2) {
return this.isSameSign(p1.x, p2.x);
},
isCollision: function isCollision(obj1, obj2) {
obj1.end = {};
obj1.end.x = obj1.start.x + obj1.width;
obj1.end.y = obj1.start.y - obj1.height;
obj2.end = {};
obj2.end.x = obj2.start.x + obj2.width;
obj2.end.y = obj2.start.y - obj2.height;
var flag = obj2.start.x > obj1.end.x || obj2.end.x < obj1.start.x || obj2.end.y > obj1.start.y || obj2.start.y < obj1.end.y;
return !flag;
}
};
function findRange(num, type, limit) {
if (isNaN(num)) {
throw new Error('[wxCharts] unvalid series data!');
}
limit = limit || 10;
type = type ? type : 'upper';
var multiple = 1;
while (limit < 1) {
limit *= 10;
multiple *= 10;
}
if (type === 'upper') {
num = Math.ceil(num * multiple);
} else {
num = Math.floor(num * multiple);
}
while (num % limit !== 0) {
if (type === 'upper') {
num++;
} else {
num--;
}
}
return num / multiple;
}
function calValidDistance(distance, chartData, config, opts) {
var dataChartAreaWidth = opts.width - config.padding - chartData.xAxisPoints[0];
var dataChartWidth = chartData.eachSpacing * opts.categories.length;
var validDistance = distance;
if (distance >= 0) {
validDistance = 0;
} else if (Math.abs(distance) >= dataChartWidth - dataChartAreaWidth) {
validDistance = dataChartAreaWidth - dataChartWidth;
}
return validDistance;
}
function isInAngleRange(angle, startAngle, endAngle) {
function adjust(angle) {
while (angle < 0) {
angle += 2 * Math.PI;
}
while (angle > 2 * Math.PI) {
angle -= 2 * Math.PI;
}
return angle;
}
angle = adjust(angle);
startAngle = adjust(startAngle);
endAngle = adjust(endAngle);
if (startAngle > endAngle) {
endAngle += 2 * Math.PI;
if (angle < startAngle) {
angle += 2 * Math.PI;
}
}
return angle >= startAngle && angle <= endAngle;
}
function calRotateTranslate(x, y, h) {
var xv = x;
var yv = h - y;
var transX = xv + (h - yv - xv) / Math.sqrt(2);
transX *= -1;
var transY = (h - yv) * (Math.sqrt(2) - 1) - (h - yv - xv) / Math.sqrt(2);
return {
transX: transX,
transY: transY
};
}
function createCurveControlPoints(points, i) {
function isNotMiddlePoint(points, i) {
if (points[i - 1] && points[i + 1]) {
return points[i].y >= Math.max(points[i - 1].y, points[i + 1].y) || points[i].y <= Math.min(points[i - 1].y, points[i + 1].y);
} else {
return false;
}
}
var a = 0.2;
var b = 0.2;
var pAx = null;
var pAy = null;
var pBx = null;
var pBy = null;
if (i < 1) {
pAx = points[0].x + (points[1].x - points[0].x) * a;
pAy = points[0].y + (points[1].y - points[0].y) * a;
} else {
pAx = points[i].x + (points[i + 1].x - points[i - 1].x) * a;
pAy = points[i].y + (points[i + 1].y - points[i - 1].y) * a;
}
if (i > points.length - 3) {
var last = points.length - 1;
pBx = points[last].x - (points[last].x - points[last - 1].x) * b;
pBy = points[last].y - (points[last].y - points[last - 1].y) * b;
} else {
pBx = points[i + 1].x - (points[i + 2].x - points[i].x) * b;
pBy = points[i + 1].y - (points[i + 2].y - points[i].y) * b;
}
// fix issue https://github.com/xiaolin3303/wx-charts/issues/79
if (isNotMiddlePoint(points, i + 1)) {
pBy = points[i + 1].y;
}
if (isNotMiddlePoint(points, i)) {
pAy = points[i].y;
}
return {
ctrA: { x: pAx, y: pAy },
ctrB: { x: pBx, y: pBy }
};
}
function convertCoordinateOrigin(x, y, center) {
return {
x: center.x + x,
y: center.y - y
};
}
function avoidCollision(obj, target) {
if (target) {
// is collision test
while (util.isCollision(obj, target)) {
if (obj.start.x > 0) {
obj.start.y--;
} else if (obj.start.x < 0) {
obj.start.y++;
} else {
if (obj.start.y > 0) {
obj.start.y++;
} else {
obj.start.y--;
}
}
}
}
return obj;
}
function fillSeriesColor(series, config) {
var index = 0;
return series.map(function (item) {
if (!item.color) {
item.color = config.colors[index];
index = (index + 1) % config.colors.length;
}
return item;
});
}
function getDataRange(minData, maxData) {
var limit = 0;
var range = maxData - minData;
if (range >= 10000) {
limit = 1000;
} else if (range >= 1000) {
limit = 100;
} else if (range >= 100) {
limit = 10;
} else if (range >= 10) {
limit = 5;
} else if (range >= 1) {
limit = 1;
} else if (range >= 0.1) {
limit = 0.1;
} else {
limit = 0.01;
}
return {
minRange: findRange(minData, 'lower', limit),
maxRange: findRange(maxData, 'upper', limit)
};
}
function measureText(text) {
var fontSize = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 10;
// wx canvas 未实现measureText方法, 此处自行实现
text = String(text);
var text = text.split('');
var width = 0;
text.forEach(function (item) {
if (/[a-zA-Z]/.test(item)) {
width += 7;
} else if (/[0-9]/.test(item)) {
width += 5.5;
} else if (/\./.test(item)) {
width += 2.7;
} else if (/-/.test(item)) {
width += 3.25;
} else if (/[\u4e00-\u9fa5]/.test(item)) {
width += 10;
} else if (/\(|\)/.test(item)) {
width += 3.73;
} else if (/\s/.test(item)) {
width += 2.5;
} else if (/%/.test(item)) {
width += 8;
} else {
width += 10;
}
});
return width * fontSize / 10;
}
function dataCombine(series) {
return series.reduce(function (a, b) {
return (a.data ? a.data : a).concat(b.data);
}, []);
}
function getSeriesDataItem(series, index) {
var data = [];
series.forEach(function (item) {
if (item.data[index] !== null && typeof item.data[index] !== 'undefined') {
var seriesItem = {};
seriesItem.color = item.color;
seriesItem.name = item.name;
seriesItem.data = item.format ? item.format(item.data[index]) : item.data[index];
data.push(seriesItem);
}
});
return data;
}
function getMaxTextListLength(list) {
var lengthList = list.map(function (item) {
return measureText(item);
});
return Math.max.apply(null, lengthList);
}
function getRadarCoordinateSeries(length) {
var eachAngle = 2 * Math.PI / length;
var CoordinateSeries = [];
for (var i = 0; i < length; i++) {
CoordinateSeries.push(eachAngle * i);
}
return CoordinateSeries.map(function (item) {
return -1 * item + Math.PI / 2;
});
}
function getToolTipData(seriesData, calPoints, index, categories) {
var option = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : {};
var textList = seriesData.map(function (item) {
return {
text: option.format ? option.format(item, categories[index]) : item.name + ': ' + item.data,
color: item.color
};
});
var validCalPoints = [];
var offset = {
x: 0,
y: 0
};
calPoints.forEach(function (points) {
if (typeof points[index] !== 'undefined' && points[index] !== null) {
validCalPoints.push(points[index]);
}
});
validCalPoints.forEach(function (item) {
offset.x = Math.round(item.x);
offset.y += item.y;
});
offset.y /= validCalPoints.length;
return { textList: textList, offset: offset };
}
function findCurrentIndex(currentPoints, xAxisPoints, opts, config) {
var offset = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 0;
var currentIndex = -1;
if (isInExactChartArea(currentPoints, opts, config)) {
xAxisPoints.forEach(function (item, index) {
if (currentPoints.x + offset > item) {
currentIndex = index;
}
});
}
return currentIndex;
}
function isInExactChartArea(currentPoints, opts, config) {
return currentPoints.x < opts.width - config.padding && currentPoints.x > config.padding + config.yAxisWidth + config.yAxisTitleWidth && currentPoints.y > config.padding && currentPoints.y < opts.height - config.legendHeight - config.xAxisHeight - config.padding;
}
function findRadarChartCurrentIndex(currentPoints, radarData, count) {
var eachAngleArea = 2 * Math.PI / count;
var currentIndex = -1;
if (isInExactPieChartArea(currentPoints, radarData.center, radarData.radius)) {
var fixAngle = function fixAngle(angle) {
if (angle < 0) {
angle += 2 * Math.PI;
}
if (angle > 2 * Math.PI) {
angle -= 2 * Math.PI;
}
return angle;
};
var angle = Math.atan2(radarData.center.y - currentPoints.y, currentPoints.x - radarData.center.x);
angle = -1 * angle;
if (angle < 0) {
angle += 2 * Math.PI;
}
var angleList = radarData.angleList.map(function (item) {
item = fixAngle(-1 * item);
return item;
});
angleList.forEach(function (item, index) {
var rangeStart = fixAngle(item - eachAngleArea / 2);
var rangeEnd = fixAngle(item + eachAngleArea / 2);
if (rangeEnd < rangeStart) {
rangeEnd += 2 * Math.PI;
}
if (angle >= rangeStart && angle <= rangeEnd || angle + 2 * Math.PI >= rangeStart && angle + 2 * Math.PI <= rangeEnd) {
currentIndex = index;
}
});
}
return currentIndex;
}
function findPieChartCurrentIndex(currentPoints, pieData) {
var currentIndex = -1;
if (isInExactPieChartArea(currentPoints, pieData.center, pieData.radius)) {
var angle = Math.atan2(pieData.center.y - currentPoints.y, currentPoints.x - pieData.center.x);
angle = -angle;
for (var i = 0, len = pieData.series.length; i < len; i++) {
var item = pieData.series[i];
if (isInAngleRange(angle, item._start_, item._start_ + item._proportion_ * 2 * Math.PI)) {
currentIndex = i;
break;
}
}
}
return currentIndex;
}
function isInExactPieChartArea(currentPoints, center, radius) {
return Math.pow(currentPoints.x - center.x, 2) + Math.pow(currentPoints.y - center.y, 2) <= Math.pow(radius, 2);
}
function splitPoints(points) {
var newPoints = [];
var items = [];
points.forEach(function (item, index) {
if (item !== null) {
items.push(item);
} else {
if (items.length) {
newPoints.push(items);
}
items = [];
}
});
if (items.length) {
newPoints.push(items);
}
return newPoints;
}
function calLegendData(series, opts, config) {
if (opts.legend === false) {
return {
legendList: [],
legendHeight: 0
};
}
var padding = 5;
var marginTop = 8;
var shapeWidth = 15;
var legendList = [];
var widthCount = 0;
var currentRow = [];
series.forEach(function (item) {
var itemWidth = 3 * padding + shapeWidth + measureText(item.name || 'undefined');
if (widthCount + itemWidth > opts.width) {
legendList.push(currentRow);
widthCount = itemWidth;
currentRow = [item];
} else {
widthCount += itemWidth;
currentRow.push(item);
}
});
if (currentRow.length) {
legendList.push(currentRow);
}
return {
legendList: legendList,
legendHeight: legendList.length * (config.fontSize + marginTop) + padding
};
}
function calCategoriesData(categories, opts, config) {
var result = {
angle: 0,
xAxisHeight: config.xAxisHeight
};
var _getXAxisPoints = getXAxisPoints(categories, opts, config),
eachSpacing = _getXAxisPoints.eachSpacing;
// get max length of categories text
var categoriesTextLenth = categories.map(function (item) {
return measureText(item);
});
var maxTextLength = Math.max.apply(this, categoriesTextLenth);
if (maxTextLength + 2 * config.xAxisTextPadding > eachSpacing) {
result.angle = 45 * Math.PI / 180;
result.xAxisHeight = 2 * config.xAxisTextPadding + maxTextLength * Math.sin(result.angle);
}
return result;
}
function getRadarDataPoints(angleList, center, radius, series, opts) {
var process = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 1;
var radarOption = opts.extra.radar || {};
radarOption.max = radarOption.max || 0;
var maxData = Math.max(radarOption.max, Math.max.apply(null, dataCombine(series)));
var data = [];
series.forEach(function (each) {
var listItem = {};
listItem.color = each.color;
listItem.data = [];
each.data.forEach(function (item, index) {
var tmp = {};
tmp.angle = angleList[index];
tmp.proportion = item / maxData;
tmp.position = convertCoordinateOrigin(radius * tmp.proportion * process * Math.cos(tmp.angle), radius * tmp.proportion * process * Math.sin(tmp.angle), center);
listItem.data.push(tmp);
});
data.push(listItem);
});
return data;
}
function getPieDataPoints(series) {
var process = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var count = 0;
var _start_ = 0;
series.forEach(function (item) {
item.data = item.data === null ? 0 : item.data;
count += item.data;
});
series.forEach(function (item) {
item.data = item.data === null ? 0 : item.data;
item._proportion_ = item.data / count * process;
});
series.forEach(function (item) {
item._start_ = _start_;
_start_ += 2 * item._proportion_ * Math.PI;
});
return series;
}
function getPieTextMaxLength(series) {
series = getPieDataPoints(series);
var maxLength = 0;
series.forEach(function (item) {
var text = item.format ? item.format(+item._proportion_.toFixed(2)) : util.toFixed(item._proportion_ * 100) + '%';
maxLength = Math.max(maxLength, measureText(text));
});
return maxLength;
}
function fixColumeData(points, eachSpacing, columnLen, index, config, opts) {
return points.map(function (item) {
if (item === null) {
return null;
}
item.width = (eachSpacing - 2 * config.columePadding) / columnLen;
if (opts.extra.column && opts.extra.column.width && +opts.extra.column.width > 0) {
// customer column width
item.width = Math.min(item.width, +opts.extra.column.width);
} else {
// default width should less tran 25px
// don't ask me why, I don't know
item.width = Math.min(item.width, 25);
}
item.x += (index + 0.5 - columnLen / 2) * item.width;
return item;
});
}
function getXAxisPoints(categories, opts, config) {
var yAxisTotalWidth = config.yAxisWidth + config.yAxisTitleWidth;
var spacingValid = opts.width - 2 * config.padding - yAxisTotalWidth;
var dataCount = opts.enableScroll ? Math.min(5, categories.length) : categories.length;
var eachSpacing = spacingValid / dataCount;
var xAxisPoints = [];
var startX = config.padding + yAxisTotalWidth;
var endX = opts.width - config.padding;
categories.forEach(function (item, index) {
xAxisPoints.push(startX + index * eachSpacing);
});
if (opts.enableScroll === true) {
xAxisPoints.push(startX + categories.length * eachSpacing);
} else {
xAxisPoints.push(endX);
}
return { xAxisPoints: xAxisPoints, startX: startX, endX: endX, eachSpacing: eachSpacing };
}
function getDataPoints(data, minRange, maxRange, xAxisPoints, eachSpacing, opts, config) {
var process = arguments.length > 7 && arguments[7] !== undefined ? arguments[7] : 1;
var points = [];
var validHeight = opts.height - 2 * config.padding - config.xAxisHeight - config.legendHeight;
data.forEach(function (item, index) {
if (item === null) {
points.push(null);
} else {
var point = {};
point.x = xAxisPoints[index] + Math.round(eachSpacing / 2);
var height = validHeight * (item - minRange) / (maxRange - minRange);
height *= process;
point.y = opts.height - config.xAxisHeight - config.legendHeight - Math.round(height) - config.padding;
points.push(point);
}
});
return points;
}
function getYAxisTextList(series, opts, config) {
var data = dataCombine(series);
// remove null from data
data = data.filter(function (item) {
return item !== null;
});
var minData = Math.min.apply(this, data);
var maxData = Math.max.apply(this, data);
if (typeof opts.yAxis.min === 'number') {
minData = Math.min(opts.yAxis.min, minData);
}
if (typeof opts.yAxis.max === 'number') {
maxData = Math.max(opts.yAxis.max, maxData);
}
// fix issue https://github.com/xiaolin3303/wx-charts/issues/9
if (minData === maxData) {
var rangeSpan = maxData || 1;
minData -= rangeSpan;
maxData += rangeSpan;
}
var dataRange = getDataRange(minData, maxData);
var minRange = dataRange.minRange;
var maxRange = dataRange.maxRange;
var range = [];
var eachRange = (maxRange - minRange) / config.yAxisSplit;
for (var i = 0; i <= config.yAxisSplit; i++) {
range.push(minRange + eachRange * i);
}
return range.reverse();
}
function calYAxisData(series, opts, config) {
var ranges = getYAxisTextList(series, opts, config);
var yAxisWidth = config.yAxisWidth;
var rangesFormat = ranges.map(function (item) {
item = util.toFixed(item, 2);
item = opts.yAxis.format ? opts.yAxis.format(Number(item)) : item;
yAxisWidth = Math.max(yAxisWidth, measureText(item) + 5);
return item;
});
if (opts.yAxis.disabled === true) {
yAxisWidth = 0;
}
return { rangesFormat: rangesFormat, ranges: ranges, yAxisWidth: yAxisWidth };
}
function drawPointShape(points, color, shape, context) {
context.beginPath();
context.setStrokeStyle("#ffffff");
context.setLineWidth(1);
context.setFillStyle(color);
if (shape === 'diamond') {
points.forEach(function (item, index) {
if (item !== null) {
context.moveTo(item.x, item.y - 4.5);
context.lineTo(item.x - 4.5, item.y);
context.lineTo(item.x, item.y + 4.5);
context.lineTo(item.x + 4.5, item.y);
context.lineTo(item.x, item.y - 4.5);
}
});
} else if (shape === 'circle') {
points.forEach(function (item, index) {
if (item !== null) {
context.moveTo(item.x + 3.5, item.y);
context.arc(item.x, item.y, 4, 0, 2 * Math.PI, false);
}
});
} else if (shape === 'rect') {
points.forEach(function (item, index) {
if (item !== null) {
context.moveTo(item.x - 3.5, item.y - 3.5);
context.rect(item.x - 3.5, item.y - 3.5, 7, 7);
}
});
} else if (shape === 'triangle') {
points.forEach(function (item, index) {
if (item !== null) {
context.moveTo(item.x, item.y - 4.5);
context.lineTo(item.x - 4.5, item.y + 4.5);
context.lineTo(item.x + 4.5, item.y + 4.5);
context.lineTo(item.x, item.y - 4.5);
}
});
}
context.closePath();
context.fill();
context.stroke();
}
function drawRingTitle(opts, config, context) {
var titlefontSize = opts.title.fontSize || config.titleFontSize;
var subtitlefontSize = opts.subtitle.fontSize || config.subtitleFontSize;
var title = opts.title.name || '';
var subtitle = opts.subtitle.name || '';
var titleFontColor = opts.title.color || config.titleColor;
var subtitleFontColor = opts.subtitle.color || config.subtitleColor;
var titleHeight = title ? titlefontSize : 0;
var subtitleHeight = subtitle ? subtitlefontSize : 0;
var margin = 5;
if (subtitle) {
var textWidth = measureText(subtitle, subtitlefontSize);
var startX = (opts.width - textWidth) / 2 + (opts.subtitle.offsetX || 0);
var startY = (opts.height - config.legendHeight + subtitlefontSize) / 2;
if (title) {
startY -= (titleHeight + margin) / 2;
}
context.beginPath();
context.setFontSize(subtitlefontSize);
context.setFillStyle(subtitleFontColor);
context.fillText(subtitle, startX, startY);
context.stroke();
context.closePath();
}
if (title) {
var _textWidth = measureText(title, titlefontSize);
var _startX = (opts.width - _textWidth) / 2 + (opts.title.offsetX || 0);
var _startY = (opts.height - config.legendHeight + titlefontSize) / 2;
if (subtitle) {
_startY += (subtitleHeight + margin) / 2;
}
context.beginPath();
context.setFontSize(titlefontSize);
context.setFillStyle(titleFontColor);
context.fillText(title, _startX, _startY);
context.stroke();
context.closePath();
}
}
function drawPointText(points, series, config, context) {
// 绘制数据文案
var data = series.data;
context.beginPath();
context.setFontSize(config.fontSize);
context.setFillStyle('#666666');
points.forEach(function (item, index) {
if (item !== null) {
var formatVal = series.format ? series.format(data[index]) : data[index];
context.fillText(formatVal, item.x - measureText(formatVal) / 2, item.y - 2);
}
});
context.closePath();
context.stroke();
}
function drawRadarLabel(angleList, radius, centerPosition, opts, config, context) {
var radarOption = opts.extra.radar || {};
radius += config.radarLabelTextMargin;
context.beginPath();
context.setFontSize(config.fontSize);
context.setFillStyle(radarOption.labelColor || '#666666');
angleList.forEach(function (angle, index) {
var pos = {
x: radius * Math.cos(angle),
y: radius * Math.sin(angle)
};
var posRelativeCanvas = convertCoordinateOrigin(pos.x, pos.y, centerPosition);
var startX = posRelativeCanvas.x;
var startY = posRelativeCanvas.y;
if (util.approximatelyEqual(pos.x, 0)) {
startX -= measureText(opts.categories[index] || '') / 2;
} else if (pos.x < 0) {
startX -= measureText(opts.categories[index] || '');
}
context.fillText(opts.categories[index] || '', startX, startY + config.fontSize / 2);
});
context.stroke();
context.closePath();
}
function drawPieText(series, opts, config, context, radius, center) {
var lineRadius = radius + config.pieChartLinePadding;
var textObjectCollection = [];
var lastTextObject = null;
var seriesConvert = series.map(function (item) {
var arc = 2 * Math.PI - (item._start_ + 2 * Math.PI * item._proportion_ / 2);
var text = item.format ? item.format(+item._proportion_.toFixed(2)) : util.toFixed(item._proportion_ * 100) + '%';
var color = item.color;
return { arc: arc, text: text, color: color };
});
seriesConvert.forEach(function (item) {
// line end
var orginX1 = Math.cos(item.arc) * lineRadius;
var orginY1 = Math.sin(item.arc) * lineRadius;
// line start
var orginX2 = Math.cos(item.arc) * radius;
var orginY2 = Math.sin(item.arc) * radius;
// text start
var orginX3 = orginX1 >= 0 ? orginX1 + config.pieChartTextPadding : orginX1 - config.pieChartTextPadding;
var orginY3 = orginY1;
var textWidth = measureText(item.text);
var startY = orginY3;
if (lastTextObject && util.isSameXCoordinateArea(lastTextObject.start, { x: orginX3 })) {
if (orginX3 > 0) {
startY = Math.min(orginY3, lastTextObject.start.y);
} else if (orginX1 < 0) {
startY = Math.max(orginY3, lastTextObject.start.y);
} else {
if (orginY3 > 0) {
startY = Math.max(orginY3, lastTextObject.start.y);
} else {
startY = Math.min(orginY3, lastTextObject.start.y);
}
}
}
if (orginX3 < 0) {
orginX3 -= textWidth;
}
var textObject = {
lineStart: {
x: orginX2,
y: orginY2
},
lineEnd: {
x: orginX1,
y: orginY1
},
start: {
x: orginX3,
y: startY
},
width: textWidth,
height: config.fontSize,
text: item.text,
color: item.color
};
lastTextObject = avoidCollision(textObject, lastTextObject);
textObjectCollection.push(lastTextObject);
});
textObjectCollection.forEach(function (item) {
var lineStartPoistion = convertCoordinateOrigin(item.lineStart.x, item.lineStart.y, center);
var lineEndPoistion = convertCoordinateOrigin(item.lineEnd.x, item.lineEnd.y, center);
var textPosition = convertCoordinateOrigin(item.start.x, item.start.y, center);
context.setLineWidth(1);
context.setFontSize(config.fontSize);
context.beginPath();
context.setStrokeStyle(item.color);
context.setFillStyle(item.color);
context.moveTo(lineStartPoistion.x, lineStartPoistion.y);
var curveStartX = item.start.x < 0 ? textPosition.x + item.width : textPosition.x;
var textStartX = item.start.x < 0 ? textPosition.x - 5 : textPosition.x + 5;
context.quadraticCurveTo(lineEndPoistion.x, lineEndPoistion.y, curveStartX, textPosition.y);
context.moveTo(lineStartPoistion.x, lineStartPoistion.y);
context.stroke();
context.closePath();
context.beginPath();
context.moveTo(textPosition.x + item.width, textPosition.y);
context.arc(curveStartX, textPosition.y, 2, 0, 2 * Math.PI);
context.closePath();
context.fill();
context.beginPath();
context.setFillStyle('#666666');
context.fillText(item.text, textStartX, textPosition.y + 3);
context.closePath();
context.stroke();
context.closePath();
});
}
function drawToolTipSplitLine(offsetX, opts, config, context) {
var startY = config.padding;
var endY = opts.height - config.padding - config.xAxisHeight - config.legendHeight;
context.beginPath();
context.setStrokeStyle('#cccccc');
context.setLineWidth(1);
context.moveTo(offsetX, startY);
context.lineTo(offsetX, endY);
context.stroke();
context.closePath();
}
function drawToolTip(textList, offset, opts, config, context) {
var legendWidth = 4;
var legendMarginRight = 5;
var arrowWidth = 8;
var isOverRightBorder = false;
offset = assign({
x: 0,
y: 0
}, offset);
offset.y -= 8;
var textWidth = textList.map(function (item) {
return measureText(item.text);
});
var toolTipWidth = legendWidth + legendMarginRight + 4 * config.toolTipPadding + Math.max.apply(null, textWidth);
var toolTipHeight = 2 * config.toolTipPadding + textList.length * config.toolTipLineHeight;
// if beyond the right border
if (offset.x - Math.abs(opts._scrollDistance_) + arrowWidth + toolTipWidth > opts.width) {
isOverRightBorder = true;
}
// draw background rect
context.beginPath();
context.setFillStyle(opts.tooltip.option.background || config.toolTipBackground);
context.setGlobalAlpha(config.toolTipOpacity);
if (isOverRightBorder) {
context.moveTo(offset.x, offset.y + 10);
context.lineTo(offset.x - arrowWidth, offset.y + 10 - 5);
context.lineTo(offset.x - arrowWidth, offset.y + 10 + 5);
context.moveTo(offset.x, offset.y + 10);
context.fillRect(offset.x - toolTipWidth - arrowWidth, offset.y, toolTipWidth, toolTipHeight);
} else {
context.moveTo(offset.x, offset.y + 10);
context.lineTo(offset.x + arrowWidth, offset.y + 10 - 5);
context.lineTo(offset.x + arrowWidth, offset.y + 10 + 5);
context.moveTo(offset.x, offset.y + 10);
context.fillRect(offset.x + arrowWidth, offset.y, toolTipWidth, toolTipHeight);
}