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https://github.com/chartjs/Chart.js.git
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aa0933e040
Fix access of uninitialized meta data while calculating circumference in the polar area chart by caching the number of visible elements in the update() method. Also make the calculateTotal() of the doughnut chart tolerant of uninitialized meta data.
293 lines
12 KiB
JavaScript
293 lines
12 KiB
JavaScript
"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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Chart.defaults.doughnut = {
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animation: {
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//Boolean - Whether we animate the rotation of the Doughnut
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animateRotate: true,
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//Boolean - Whether we animate scaling the Doughnut from the centre
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animateScale: false
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},
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aspectRatio: 1,
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hover: {
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mode: 'single'
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},
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legendCallback: function(chart) {
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var text = [];
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text.push('<ul class="' + chart.id + '-legend">');
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if (chart.data.datasets.length) {
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for (var i = 0; i < chart.data.datasets[0].data.length; ++i) {
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text.push('<li><span style="background-color:' + chart.data.datasets[0].backgroundColor[i] + '"></span>');
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if (chart.data.labels[i]) {
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text.push(chart.data.labels[i]);
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}
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text.push('</li>');
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}
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}
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text.push('</ul>');
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return text.join("");
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},
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legend: {
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labels: {
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generateLabels: function(chart) {
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var data = chart.data;
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if (data.labels.length && data.datasets.length) {
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return data.labels.map(function(label, i) {
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var meta = chart.getDatasetMeta(0);
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var ds = data.datasets[0];
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var arc = meta.data[i];
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var fill = arc.custom && arc.custom.backgroundColor ? arc.custom.backgroundColor : helpers.getValueAtIndexOrDefault(ds.backgroundColor, i, this.chart.options.elements.arc.backgroundColor);
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var stroke = arc.custom && arc.custom.borderColor ? arc.custom.borderColor : helpers.getValueAtIndexOrDefault(ds.borderColor, i, this.chart.options.elements.arc.borderColor);
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var bw = arc.custom && arc.custom.borderWidth ? arc.custom.borderWidth : helpers.getValueAtIndexOrDefault(ds.borderWidth, i, this.chart.options.elements.arc.borderWidth);
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return {
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text: label,
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fillStyle: fill,
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strokeStyle: stroke,
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lineWidth: bw,
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hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
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// Extra data used for toggling the correct item
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index: i
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};
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}, this);
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} else {
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return [];
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}
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}
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},
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onClick: function(e, legendItem) {
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var index = legendItem.index;
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var chart = this.chart;
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var i, ilen, meta;
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for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
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meta = chart.getDatasetMeta(i);
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meta.data[index].hidden = !meta.data[index].hidden;
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}
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chart.update();
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}
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},
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//The percentage of the chart that we cut out of the middle.
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cutoutPercentage: 50,
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//The rotation of the chart, where the first data arc begins.
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rotation: Math.PI * -0.5,
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//The total circumference of the chart.
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circumference: Math.PI * 2.0,
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// Need to override these to give a nice default
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tooltips: {
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callbacks: {
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title: function() {
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return '';
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},
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label: function(tooltipItem, data) {
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return data.labels[tooltipItem.index] + ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
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}
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}
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}
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};
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Chart.defaults.pie = helpers.clone(Chart.defaults.doughnut);
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helpers.extend(Chart.defaults.pie, {
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cutoutPercentage: 0
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});
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Chart.controllers.doughnut = Chart.controllers.pie = Chart.DatasetController.extend({
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linkScales: function() {
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// no scales for doughnut
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},
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addElements: function() {
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var meta = this.getMeta();
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helpers.each(this.getDataset().data, function(value, index) {
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meta.data[index] = meta.data[index] || new Chart.elements.Arc({
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_index: index
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});
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}, this);
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},
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addElementAndReset: function(index, colorForNewElement) {
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var arc = new Chart.elements.Arc({
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_index: index
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});
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if (colorForNewElement && helpers.isArray(this.getDataset().backgroundColor)) {
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this.getDataset().backgroundColor.splice(index, 0, colorForNewElement);
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}
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// Add to the points array and reset it
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this.getMeta().data.splice(index, 0, arc);
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this.updateElement(arc, index, true);
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},
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// Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
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getRingIndex: function getRingIndex(datasetIndex) {
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var ringIndex = 0;
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for (var j = 0; j < datasetIndex; ++j) {
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if (this.chart.isDatasetVisible(j)) {
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++ringIndex;
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}
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}
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return ringIndex;
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},
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update: function update(reset) {
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var availableWidth = this.chart.chartArea.right - this.chart.chartArea.left - this.chart.options.elements.arc.borderWidth;
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var availableHeight = this.chart.chartArea.bottom - this.chart.chartArea.top - this.chart.options.elements.arc.borderWidth;
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var minSize = Math.min(availableWidth, availableHeight);
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var offset = {x: 0, y: 0};
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// If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
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if (this.chart.options.circumference < Math.PI * 2.0) {
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var startAngle = this.chart.options.rotation % (Math.PI * 2.0);
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startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
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var endAngle = startAngle + this.chart.options.circumference;
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var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
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var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
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var contains0 = (startAngle <= 0 && 0 <= endAngle) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
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var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
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var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
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var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
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var cutout = this.chart.options.cutoutPercentage / 100.0;
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var min = {x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)), y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))};
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var max = {x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)), y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))};
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var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
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minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
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offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
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}
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this.chart.outerRadius = Math.max(minSize / 2, 0);
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this.chart.innerRadius = Math.max(this.chart.options.cutoutPercentage ? (this.chart.outerRadius / 100) * (this.chart.options.cutoutPercentage) : 1, 0);
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this.chart.radiusLength = (this.chart.outerRadius - this.chart.innerRadius) / this.chart.getVisibleDatasetCount();
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this.chart.offsetX = offset.x * this.chart.outerRadius;
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this.chart.offsetY = offset.y * this.chart.outerRadius;
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this.getMeta().total = this.calculateTotal();
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this.outerRadius = this.chart.outerRadius - (this.chart.radiusLength * this.getRingIndex(this.index));
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this.innerRadius = this.outerRadius - this.chart.radiusLength;
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helpers.each(this.getMeta().data, function(arc, index) {
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this.updateElement(arc, index, reset);
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}, this);
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},
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updateElement: function(arc, index, reset) {
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var centerX = (this.chart.chartArea.left + this.chart.chartArea.right) / 2;
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var centerY = (this.chart.chartArea.top + this.chart.chartArea.bottom) / 2;
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var startAngle = this.chart.options.rotation; // non reset case handled later
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var endAngle = this.chart.options.rotation; // non reset case handled later
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var circumference = reset && this.chart.options.animation.animateRotate ? 0 : arc.hidden? 0 : this.calculateCircumference(this.getDataset().data[index]) * (this.chart.options.circumference / (2.0 * Math.PI));
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var innerRadius = reset && this.chart.options.animation.animateScale ? 0 : this.innerRadius;
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var outerRadius = reset && this.chart.options.animation.animateScale ? 0 : this.outerRadius;
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helpers.extend(arc, {
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// Utility
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_index: index,
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// Desired view properties
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_model: {
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x: centerX + this.chart.offsetX,
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y: centerY + this.chart.offsetY,
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startAngle: startAngle,
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endAngle: endAngle,
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circumference: circumference,
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outerRadius: outerRadius,
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innerRadius: innerRadius,
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backgroundColor: arc.custom && arc.custom.backgroundColor ? arc.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.arc.backgroundColor),
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hoverBackgroundColor: arc.custom && arc.custom.hoverBackgroundColor ? arc.custom.hoverBackgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().hoverBackgroundColor, index, this.chart.options.elements.arc.hoverBackgroundColor),
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borderWidth: arc.custom && arc.custom.borderWidth ? arc.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.arc.borderWidth),
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borderColor: arc.custom && arc.custom.borderColor ? arc.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.arc.borderColor),
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label: helpers.getValueAtIndexOrDefault(this.getDataset().label, index, this.chart.data.labels[index])
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}
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});
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// Set correct angles if not resetting
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if (!reset) {
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if (index === 0) {
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arc._model.startAngle = this.chart.options.rotation;
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} else {
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arc._model.startAngle = this.getMeta().data[index - 1]._model.endAngle;
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}
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arc._model.endAngle = arc._model.startAngle + arc._model.circumference;
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}
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arc.pivot();
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},
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draw: function(ease) {
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var easingDecimal = ease || 1;
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helpers.each(this.getMeta().data, function(arc, index) {
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arc.transition(easingDecimal).draw();
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});
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},
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setHoverStyle: function(arc) {
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var dataset = this.chart.data.datasets[arc._datasetIndex];
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var index = arc._index;
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arc._model.backgroundColor = arc.custom && arc.custom.hoverBackgroundColor ? arc.custom.hoverBackgroundColor : helpers.getValueAtIndexOrDefault(dataset.hoverBackgroundColor, index, helpers.color(arc._model.backgroundColor).saturate(0.5).darken(0.1).rgbString());
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arc._model.borderColor = arc.custom && arc.custom.hoverBorderColor ? arc.custom.hoverBorderColor : helpers.getValueAtIndexOrDefault(dataset.hoverBorderColor, index, helpers.color(arc._model.borderColor).saturate(0.5).darken(0.1).rgbString());
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arc._model.borderWidth = arc.custom && arc.custom.hoverBorderWidth ? arc.custom.hoverBorderWidth : helpers.getValueAtIndexOrDefault(dataset.hoverBorderWidth, index, arc._model.borderWidth);
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},
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removeHoverStyle: function(arc) {
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var dataset = this.chart.data.datasets[arc._datasetIndex];
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var index = arc._index;
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arc._model.backgroundColor = arc.custom && arc.custom.backgroundColor ? arc.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.arc.backgroundColor);
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arc._model.borderColor = arc.custom && arc.custom.borderColor ? arc.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.arc.borderColor);
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arc._model.borderWidth = arc.custom && arc.custom.borderWidth ? arc.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.arc.borderWidth);
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},
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calculateTotal: function() {
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var dataset = this.getDataset();
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var meta = this.getMeta();
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var total = 0;
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var value;
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helpers.each(meta.data, function(element, index) {
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value = dataset.data[index];
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if (!isNaN(value) && !element.hidden) {
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total += Math.abs(value);
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}
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});
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return total;
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},
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calculateCircumference: function(value) {
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var total = this.getMeta().total;
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if (total > 0 && !isNaN(value)) {
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return (Math.PI * 2.0) * (value / total);
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} else {
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return 0;
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}
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}
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});
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};
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