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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 } // IE polyfill for Date Date.now = Date.now || function() { return +(new Date()); }; /** * Draw a circle around the center of the canvas * @param {strong} color Valid CSS color string * @param {number} lineWidth Width of the line in px * @param {number} percent Percentage to draw (float between -1 and 1) */ var drawCircle = function(color, lineWidth, percent) { percent = Math.min(Math.max(-1, percent || 0), 1); var isNegative = percent <= 0 ? true : false; ctx.beginPath(); ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, isNegative); ctx.strokeStyle = color; ctx.lineWidth = lineWidth; ctx.stroke(); }; /** * Draw the scale of the chart */ var drawScale = function() { var offset; var length; ctx.lineWidth = 1; ctx.fillStyle = options.scaleColor; ctx.save(); for (var i = 24; i > 0; --i) { if (i % 6 === 0) { length = options.scaleLength; offset = 0; } else { length = options.scaleLength * 0.6; offset = options.scaleLength - length; } ctx.fillRect(-options.size/2 + offset, 0, length, 1); ctx.rotate(Math.PI / 12); } ctx.restore(); }; /** * Request animation frame wrapper with polyfill * @return {function} Request animation frame method or timeout fallback */ var reqAnimationFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; }()); /** * Draw the background of the plugin including the scale and the track */ var drawBackground = function() { if(options.scaleColor) drawScale(); if(options.trackColor) drawCircle(options.trackColor, options.trackWidth || options.lineWidth, 1); }; /** * Canvas accessor */ this.getCanvas = function() { return canvas; }; /** * Canvas 2D context 'ctx' accessor */ this.getCtx = function() { return ctx; }; /** * Clear the complete canvas */ this.clear = function() { ctx.clearRect(options.size / -2, options.size / -2, options.size, options.size); }; /** * Draw the complete chart * @param {number} percent Percent shown by the chart between -100 and 100 */ this.draw = function(percent) { // do we need to render a background if (!!options.scaleColor || !!options.trackColor) { // getImageData and putImageData are supported if (ctx.getImageData && ctx.putImageData) { if (!cachedBackground) { drawBackground(); cachedBackground = ctx.getImageData(0, 0, options.size * scaleBy, options.size * scaleBy); } else { ctx.putImageData(cachedBackground, 0, 0); } } else { this.clear(); drawBackground(); } } else { this.clear(); } ctx.lineCap = options.lineCap; // if barcolor is a function execute it and pass the percent as a value var color; if (typeof(options.barColor) === 'function') { color = options.barColor(percent); } else { color = options.barColor; } // draw bar drawCircle(color, options.lineWidth, percent / 100); }.bind(this); /** * Animate from some percent to some other percentage * @param {number} from Starting percentage * @param {number} to Final percentage */ this.animate = function(from, to) { var startTime = Date.now(); options.onStart(from, to); var animation = function() { var process = Math.min(Date.now() - startTime, options.animate.duration); var currentValue = options.easing(this, process, from, to - from, options.animate.duration); this.draw(currentValue); options.onStep(from, to, currentValue); if (process >= options.animate.duration) { options.onStop(from, to); } else { reqAnimationFrame(animation); } }.bind(this); reqAnimationFrame(animation); }.bind(this); }; var EasyPieChart = function(el, opts) { var defaultOptions = { barColor: '#ef1e25', trackColor: '#f9f9f9', scaleColor: '#dfe0e0', scaleLength: 5, lineCap: 'round', lineWidth: 3, trackWidth: undefined, size: 110, rotate: 0, animate: { duration: 1000, enabled: true }, easing: function (x, t, b, c, d) { // more can be found here: http://gsgd.co.uk/sandbox/jquery/easing/ t = t / (d/2); if (t < 1) { return c / 2 * t * t + b; } return -c/2 * ((--t)*(t-2) - 1) + b; }, onStart: function(from, to) { return; }, onStep: function(from, to, currentValue) { return; }, onStop: function(from, to) { return; } }; // detect present renderer if (typeof(CanvasRenderer) !== 'undefined') { defaultOptions.renderer = CanvasRenderer; } else if (typeof(SVGRenderer) !== 'undefined') { defaultOptions.renderer = SVGRenderer; } else { throw new Error('Please load either the SVG- or the CanvasRenderer'); } var options = {}; var currentValue = 0; /** * Initialize the plugin by creating the options object and initialize rendering */ var init = function() { this.el = el; this.options = options; // merge user options into default options for (var i in defaultOptions) { if (defaultOptions.hasOwnProperty(i)) { options[i] = opts && typeof(opts[i]) !== 'undefined' ? opts[i] : defaultOptions[i]; if (typeof(options[i]) === 'function') { options[i] = options[i].bind(this); } } } // check for jQuery easing if (typeof(options.easing) === 'string' && typeof(jQuery) !== 'undefined' && jQuery.isFunction(jQuery.easing[options.easing])) { options.easing = jQuery.easing[options.easing]; } else { options.easing = defaultOptions.easing; } // process earlier animate option to avoid bc breaks if (typeof(options.animate) === 'number') { options.animate = { duration: options.animate, enabled: true }; } if (typeof(options.animate) === 'boolean' && !options.animate) { options.animate = { duration: 1000, enabled: options.animate }; } // create renderer this.renderer = new options.renderer(el, options); // initial draw this.renderer.draw(currentValue); // initial update if (el.dataset && el.dataset.percent) { this.update(parseFloat(el.dataset.percent)); } else if (el.getAttribute && el.getAttribute('data-percent')) { this.update(parseFloat(el.getAttribute('data-percent'))); } }.bind(this); /** * Update the value of the chart * @param {number} newValue Number between 0 and 100 * @return {object} Instance of the plugin for method chaining */ this.update = function(newValue) { newValue = parseFloat(newValue); if (options.animate.enabled) { this.renderer.animate(currentValue, newValue); } else { this.renderer.draw(newValue); } currentValue = newValue; return this; }.bind(this); /** * Disable animation * @return {object} Instance of the plugin for method chaining */ this.disableAnimation = function() { options.animate.enabled = false; return this; }; /** * Enable animation * @return {object} Instance of the plugin for method chaining */ this.enableAnimation = function() { options.animate.enabled = true; return this; }; init(); }; $.fn.easyPieChart = function(options) { return this.each(function() { var instanceOptions; if (!$.data(this, 'easyPieChart')) { instanceOptions = $.extend({}, options, $(this).data()); $.data(this, 'easyPieChart', new EasyPieChart(this, instanceOptions)); } }); }; }));
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