mirror of
https://github.com/chartjs/Chart.js.git
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304 lines
9.7 KiB
JavaScript
304 lines
9.7 KiB
JavaScript
'use strict';
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module.exports = function(Chart) {
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var helpers = Chart.helpers,
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defaults = Chart.defaults;
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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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var data = chart.data;
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var datasets = data.datasets;
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var labels = data.labels;
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if (datasets.length) {
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for (var i = 0; i < datasets[0].data.length; ++i) {
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text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
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if (labels[i]) {
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text.push(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 custom = arc && arc.custom || {};
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var getValueAtIndexOrDefault = helpers.getValueAtIndexOrDefault;
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var arcOpts = chart.options.elements.arc;
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var fill = custom.backgroundColor ? custom.backgroundColor : getValueAtIndexOrDefault(ds.backgroundColor, i, arcOpts.backgroundColor);
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var stroke = custom.borderColor ? custom.borderColor : getValueAtIndexOrDefault(ds.borderColor, i, arcOpts.borderColor);
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var bw = custom.borderWidth ? custom.borderWidth : getValueAtIndexOrDefault(ds.borderWidth, i, arcOpts.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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});
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}
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return [];
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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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// toggle visibility of index if exists
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if (meta.data[index]) {
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meta.data[index].hidden = !meta.data[index].hidden;
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}
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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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var dataLabel = data.labels[tooltipItem.index];
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var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
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if (helpers.isArray(dataLabel)) {
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// show value on first line of multiline label
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// need to clone because we are changing the value
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dataLabel = dataLabel.slice();
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dataLabel[0] += value;
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} else {
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dataLabel += value;
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}
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return dataLabel;
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}
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}
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}
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};
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defaults.pie = helpers.clone(defaults.doughnut);
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helpers.extend(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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dataElementType: Chart.elements.Arc,
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linkScales: helpers.noop,
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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(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(reset) {
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var me = this;
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var chart = me.chart,
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chartArea = chart.chartArea,
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opts = chart.options,
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arcOpts = opts.elements.arc,
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availableWidth = chartArea.right - chartArea.left - arcOpts.borderWidth,
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availableHeight = chartArea.bottom - chartArea.top - arcOpts.borderWidth,
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minSize = Math.min(availableWidth, availableHeight),
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offset = {
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x: 0,
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y: 0
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},
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meta = me.getMeta(),
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cutoutPercentage = opts.cutoutPercentage,
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circumference = opts.circumference;
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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 (circumference < Math.PI * 2.0) {
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var startAngle = opts.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 + 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 = 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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chart.borderWidth = me.getMaxBorderWidth(meta.data);
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chart.outerRadius = Math.max((minSize - chart.borderWidth) / 2, 0);
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chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 0, 0);
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chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
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chart.offsetX = offset.x * chart.outerRadius;
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chart.offsetY = offset.y * chart.outerRadius;
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meta.total = me.calculateTotal();
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me.outerRadius = chart.outerRadius - (chart.radiusLength * me.getRingIndex(me.index));
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me.innerRadius = Math.max(me.outerRadius - chart.radiusLength, 0);
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helpers.each(meta.data, function(arc, index) {
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me.updateElement(arc, index, reset);
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});
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},
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updateElement: function(arc, index, reset) {
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var me = this;
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var chart = me.chart,
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chartArea = chart.chartArea,
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opts = chart.options,
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animationOpts = opts.animation,
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centerX = (chartArea.left + chartArea.right) / 2,
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centerY = (chartArea.top + chartArea.bottom) / 2,
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startAngle = opts.rotation, // non reset case handled later
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endAngle = opts.rotation, // non reset case handled later
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dataset = me.getDataset(),
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circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : me.calculateCircumference(dataset.data[index]) * (opts.circumference / (2.0 * Math.PI)),
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innerRadius = reset && animationOpts.animateScale ? 0 : me.innerRadius,
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outerRadius = reset && animationOpts.animateScale ? 0 : me.outerRadius,
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valueAtIndexOrDefault = helpers.getValueAtIndexOrDefault;
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helpers.extend(arc, {
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// Utility
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_datasetIndex: me.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 + chart.offsetX,
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y: centerY + 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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label: valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
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}
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});
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var model = arc._model;
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// Resets the visual styles
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this.removeHoverStyle(arc);
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// Set correct angles if not resetting
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if (!reset || !animationOpts.animateRotate) {
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if (index === 0) {
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model.startAngle = opts.rotation;
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} else {
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model.startAngle = me.getMeta().data[index - 1]._model.endAngle;
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}
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model.endAngle = model.startAngle + model.circumference;
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}
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arc.pivot();
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},
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removeHoverStyle: function(arc) {
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Chart.DatasetController.prototype.removeHoverStyle.call(this, arc, this.chart.options.elements.arc);
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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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/* if (total === 0) {
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total = NaN;
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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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}
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return 0;
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},
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// gets the max border or hover width to properly scale pie charts
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getMaxBorderWidth: function(elements) {
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var max = 0,
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index = this.index,
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length = elements.length,
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borderWidth,
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hoverWidth;
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for (var i = 0; i < length; i++) {
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borderWidth = elements[i]._model ? elements[i]._model.borderWidth : 0;
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hoverWidth = elements[i]._chart ? elements[i]._chart.config.data.datasets[index].hoverBorderWidth : 0;
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max = borderWidth > max ? borderWidth : max;
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max = hoverWidth > max ? hoverWidth : max;
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}
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return max;
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}
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});
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};
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