web/assets/libs/jquery-plugin/jquery.easy-pie-chart/jquery.easypiechart.js

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/**!
 * easyPieChart
 * Lightweight plugin to render simple, animated and retina optimized pie charts
 *
 * @license 
 * @author Robert Fleischmann <rendro87@gmail.com> (http://robert-fleischmann.de)
 * @version 2.1.6
 **/

(function(root, factory) {
    if(typeof exports === 'object') {
        module.exports = factory(require('jquery'));
    }
    else if(typeof define === 'function' && define.amd) {
        define(['jquery'], factory);
    }
    else {
        factory(root.jQuery);
    }
}(this, function($) {

/**
 * Renderer to render the chart on a canvas object
 * @param {DOMElement} el      DOM element to host the canvas (root of the plugin)
 * @param {object}     options options object of the plugin
 */
var CanvasRenderer = function(el, options) {
	var cachedBackground;
	var canvas = document.createElement('canvas');

	el.appendChild(canvas);

	if (typeof(G_vmlCanvasManager) !== 'undefined') {
		G_vmlCanvasManager.initElement(canvas);
	}

	var ctx = canvas.getContext('2d');

	canvas.width = canvas.height = options.size;

	// canvas on retina devices
	var scaleBy = 1;
	if (window.devicePixelRatio > 1) {
		scaleBy = window.devicePixelRatio;
		canvas.style.width = canvas.style.height = [options.size, 'px'].join('');
		canvas.width = canvas.height = options.size * scaleBy;
		ctx.scale(scaleBy, scaleBy);
	}

	// move 0,0 coordinates to the center
	ctx.translate(options.size / 2, options.size / 2);

	// rotate canvas -90deg
	ctx.rotate((-1 / 2 + options.rotate / 180) * Math.PI);

	var radius = (options.size - options.lineWidth) / 2;
	if (options.scaleColor && options.scaleLength) {
		radius -= options.scaleLength + 2; // 2 is the distance between scale and bar
	}