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