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Canvas Pie Progress
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>JS Bin</title> | |
| <style> | |
| canvas { | |
| -webkit-transform: scale3d(2, 2, 0) translate3d(260, 0, 0); | |
| -moz-transform: scale3d(2, 2, 0) translate3d(260, 0, 0); | |
| -ms-transform: scale3d(2, 2, 0) translate3d(260, 0, 0); | |
| -o-transform: scale3d(2, 2, 0) translate3d(260, 0, 0); | |
| transform: scale3d(2, 2, 0) translate3d(260, 0, 0); | |
| border-radius: 125px; | |
| background-position: 50% 40%; | |
| display: block; | |
| width: 250px; | |
| height: 250px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="test-progress" width="250" height="250"></canvas> | |
| <button type="button">Set</button> | |
| <input id="percent" type="text" value="10"> | |
| <script src="pie-progress.js"></script> | |
| <script src="request-animation.js"></script> | |
| <script> | |
| var progress = new PieProgress('test-progress'); | |
| document.querySelector('button').addEventListener('click', function () { | |
| var value = document.querySelector('#percent').value; | |
| progress.set(parseInt(value, 10)); | |
| }, false); | |
| </script> | |
| </body> | |
| </html> |
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| var PieProgress = function (id, options) { | |
| if ('object' !== typeof(options) || options === null) { | |
| options = {}; | |
| } | |
| var dpr = window.devicePixelRatio || 1 | |
| , size = parseInt(options.size, 10) || 250 | |
| , line = parseInt(options.lineWidth, 10) || 10 | |
| ; | |
| this.canvas = document.getElementById(id); | |
| this.ctx = this.canvas.getContext('2d'); | |
| this.radius = (size/2 - line/3) * dpr; | |
| this.fps = options.fps || 60; | |
| this.size = size * dpr; | |
| this.position = this.size/2; | |
| this.color = PieProgress.COLORS['0']; | |
| this.canvas.width = this.size; | |
| this.canvas.height = this.size; | |
| this.canvas.style.width = size; | |
| this.canvas.style.height = size; | |
| this.ctx.lineWidth = line; | |
| this.ctx.strokeStyle = this.color; | |
| }; | |
| PieProgress.prototype = { | |
| /** | |
| * public | |
| * @type {boolean} | |
| */ | |
| working: false, | |
| /** | |
| * @private | |
| * @type {number} | |
| */ | |
| timerId: 0, | |
| /** | |
| * @private | |
| * @type {number} | |
| */ | |
| animationId: 0, | |
| /** | |
| * @public | |
| * @type {number} | |
| */ | |
| value: 0, | |
| /** | |
| * @private | |
| * @type {number} | |
| */ | |
| current: 0, | |
| /** | |
| * private | |
| * @type {boolean} | |
| */ | |
| inverse: false, | |
| /** | |
| * @private | |
| */ | |
| draw: function () { | |
| this.timerId = setTimeout(function () { | |
| this.animationId = requestAnimationFrame(this.draw.bind(this)); | |
| var max = 360/100 * this.value | |
| , percent = this.current * 100 / 360 | |
| , stop = this.inverse ? (this.current < max) : (this.current > max) | |
| ; | |
| if (stop) { | |
| return this.stop(); | |
| } | |
| if (PieProgress.COLORS.hasOwnProperty(percent)) { | |
| this.color = PieProgress.COLORS[percent]; | |
| } | |
| this.ctx.clearRect(0, 0, this.size, this.size); | |
| this.ctx.save(); | |
| this.ctx.beginPath(); | |
| this.ctx.strokeStyle = this.color; | |
| this.ctx.arc(this.position, this.position, this.radius, 0, this.current * (Math.PI/180), false); | |
| this.ctx.stroke(); | |
| this.ctx.restore(); | |
| if (this.inverse) { | |
| this.current--; | |
| } else { | |
| this.current++; | |
| } | |
| }.bind(this), 1000 / this.fps); | |
| }, | |
| /** | |
| * @param {number} value | |
| * @return {PieProgress} | |
| */ | |
| set: function (value) { | |
| if (this.value !== value) { | |
| this.inverse = (value < this.value); | |
| this.value = value; | |
| this.stop().start(); | |
| } | |
| return this; | |
| }, | |
| /** | |
| * @public | |
| * @return {PieProgress} | |
| */ | |
| start: function() { | |
| if (!this.working) { | |
| this.draw(); | |
| this.working = true; | |
| } | |
| return this; | |
| }, | |
| /** | |
| * @public | |
| * @return {PieProgress} | |
| */ | |
| stop: function() { | |
| clearTimeout(this.timerId); | |
| cancelAnimationFrame(this.animationId); | |
| this.working = false; | |
| this.timerId = this.animationId = null; | |
| return this; | |
| } | |
| }; | |
| PieProgress.COLORS = { | |
| '0': '#3BB600', | |
| '75': '#EE8E45', | |
| '90': '#E02800' | |
| }; |
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| // http://paulirish.com/2011/requestanimationframe-for-smart-animating/ | |
| // http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating | |
| // requestAnimationFrame polyfill by Erik Möller | |
| // fixes from Paul Irish and Tino Zijdel | |
| (function() { | |
| var lastTime = 0; | |
| var vendors = ['ms', 'moz', 'webkit', 'o']; | |
| for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { | |
| window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; | |
| window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] | |
| || window[vendors[x]+'CancelRequestAnimationFrame']; | |
| } | |
| if (!window.requestAnimationFrame) | |
| window.requestAnimationFrame = function(callback, element) { | |
| var currTime = new Date().getTime(); | |
| var timeToCall = Math.max(0, 16 - (currTime - lastTime)); | |
| var id = window.setTimeout(function() { callback(currTime + timeToCall); }, | |
| timeToCall); | |
| lastTime = currTime + timeToCall; | |
| return id; | |
| }; | |
| if (!window.cancelAnimationFrame) | |
| window.cancelAnimationFrame = function(id) { | |
| clearTimeout(id); | |
| }; | |
| }()); |
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