Created
November 11, 2009 07:52
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| function Animation(canvasId, fps) { | |
| this.canvas = document.getElementById(canvasId); | |
| this.drawingContext = this.canvas.getContext('2d'); | |
| this.fps = fps; | |
| this.drawing = {}; | |
| this.frame = 0; | |
| this.start(); | |
| } | |
| Animation.prototype.start = function() { | |
| var t = this; | |
| this.animProcess = setInterval(function(){t.draw();}, Math.round(1.0/this.fps*1000)); | |
| this.running = true; | |
| }; | |
| Animation.prototype.draw = function() { | |
| this.drawingContext.clearRect(0, 0, this.canvas.width, this.canvas.height); | |
| for (name in this.drawing) | |
| this.drawing[name](this.drawingContext, this.frame); // run drawing procedure | |
| this.frame += 1; | |
| }; | |
| Animation.prototype.pause = function() { | |
| if (!this.running) return; | |
| clearInterval(this.animProcess); | |
| this.running = false; | |
| }; | |
| Animation.prototype.reset = function() { | |
| this.frame = 0; | |
| }; | |
| Animation.prototype.stop = function() { | |
| if (!this.running) return; | |
| this.pause(); | |
| this.reset(); | |
| }; |
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| <html> | |
| <head> | |
| <title>Devyn's Canvas Test</title> | |
| <script src="canvas-animation.js"></script> | |
| <script> | |
| var anim; | |
| function init() { | |
| anim = new Animation('canvas', 30); | |
| anim.drawing.square = function(ctx, frame) { | |
| ctx.save(); | |
| ctx.translate(60, 60); | |
| ctx.rotate(Math.PI/180 * (frame % 360)); | |
| ctx.fillStyle = "rgb(40,40,40)"; | |
| ctx.fillRect(-30,-30,60,60); | |
| ctx.restore(); | |
| }; | |
| anim.drawing.innerSquare = function(ctx, frame) { | |
| ctx.save(); | |
| ctx.translate(60, 60); | |
| ctx.rotate(Math.PI/180 * (frame*3 % 360)); | |
| ctx.fillStyle = "#00ffff"; | |
| ctx.fillRect(-15,-15,30,30); | |
| ctx.restore(); | |
| }; | |
| } | |
| </script> | |
| </head> | |
| <body onload="init();"> | |
| <div><canvas id="canvas" width="120" height="120"></canvas></div> | |
| <div> | |
| <a href="#" onclick="if (anim.running) anim.pause(); else anim.start();">Play/Pause</a> | | |
| <a href="#" onclick="anim.stop();">Stop</a> | |
| </div> | |
| </body> | |
| </html> |
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