104 lines
3.3 KiB
JavaScript
Executable File
104 lines
3.3 KiB
JavaScript
Executable File
"use strict";
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module.exports = function() {
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//Occupy the global variable of Chart, and create a simple base class
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var Chart = function(context, config) {
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this.config = config;
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// Support a jQuery'd canvas element
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if (context.length && context[0].getContext) {
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context = context[0];
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}
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// Support a canvas domnode
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if (context.getContext) {
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context = context.getContext("2d");
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}
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this.ctx = context;
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this.canvas = context.canvas;
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// Figure out what the size of the chart will be.
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// If the canvas has a specified width and height, we use those else
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// we look to see if the canvas node has a CSS width and height.
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// If there is still no height, fill the parent container
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this.width = context.canvas.width || parseInt(Chart.helpers.getStyle(context.canvas, 'width')) || Chart.helpers.getMaximumWidth(context.canvas);
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this.height = context.canvas.height || parseInt(Chart.helpers.getStyle(context.canvas, 'height')) || Chart.helpers.getMaximumHeight(context.canvas);
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this.aspectRatio = this.width / this.height;
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if (isNaN(this.aspectRatio) || isFinite(this.aspectRatio) === false) {
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// If the canvas has no size, try and figure out what the aspect ratio will be.
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// Some charts prefer square canvases (pie, radar, etc). If that is specified, use that
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// else use the canvas default ratio of 2
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this.aspectRatio = config.aspectRatio !== undefined ? config.aspectRatio : 2;
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}
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// Store the original style of the element so we can set it back
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this.originalCanvasStyleWidth = context.canvas.style.width;
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this.originalCanvasStyleHeight = context.canvas.style.height;
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// High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
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Chart.helpers.retinaScale(this);
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if (config) {
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this.controller = new Chart.Controller(this);
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}
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// Always bind this so that if the responsive state changes we still work
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var _this = this;
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Chart.helpers.addResizeListener(context.canvas.parentNode, function() {
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if (_this.controller && _this.controller.config.options.responsive) {
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_this.controller.resize();
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}
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});
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return this.controller ? this.controller : this;
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};
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//Globally expose the defaults to allow for user updating/changing
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Chart.defaults = {
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global: {
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responsive: true,
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responsiveAnimationDuration: 0,
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maintainAspectRatio: true,
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events: ["mousemove", "mouseout", "click", "touchstart", "touchmove"],
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hover: {
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onHover: null,
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mode: 'single',
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animationDuration: 400
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},
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onClick: null,
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defaultColor: 'rgba(0,0,0,0.1)',
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defaultFontColor: '#666',
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defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
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defaultFontSize: 12,
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defaultFontStyle: 'normal',
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showLines: true,
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// Element defaults defined in element extensions
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elements: {},
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// Legend callback string
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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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for (var i = 0; i < chart.data.datasets.length; i++) {
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text.push('<li><span style="background-color:' + chart.data.datasets[i].backgroundColor + '">');
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if (chart.data.datasets[i].label) {
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text.push(chart.data.datasets[i].label);
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}
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text.push('</span></li>');
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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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}
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};
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return Chart;
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}; |