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POGoogle Closure's Graphic module is too much slow. goog.graphics.CanvasGraphics
 

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  1. POGoogle Closure's Graphic module is too much slow. goog.graphics.CanvasGraphics
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    <p>Recently, I study HTML Canvas using Google Closure.</p> <p>but the performance of Google Closure is terribly slow. </p> <p>when I run my code.. it almost crash down Chrome browser. </p> <p>Of course I did the same thing in HTML Canvas code not using Google Closure; It is super fast.</p> <p>Here is my canvas code using Google Closure (goog.graphics.CanvasGraphics)</p> <p>Since I am just a beginner in this module(goog.graphics.CanvasGraphics), I am not sure I did it correctly. Is there a something wrong I did? Why is it so terribly slow??!!</p> <p>It is too frustrating. </p> <pre><code>/** * @param {Document} doct */ test.main = function(doct){ var dom = new goog.dom.DomHelper(doct); /** * goog.graphics.CanvasGraphics(width, height, opt_coordWidth, opt_coordHeight, opt_domHelper) * @type {goog.graphics.CanvasGraphics} */ var canvas = new goog.graphics.CanvasGraphics(500, 500, null, null, dom); canvas.render(dom.getElement('canvasTest2')) canvas.balls = []; function drawScreen () { canvas.clear() for (var i =0; i &lt;canvas.balls.length; i++) { ball = canvas.balls[i]; ball.x += ball.xunits; ball.y += ball.yunits; var ellipse = canvas.drawEllipse(ball.x, ball.y, ball.radius, ball.radius, null, ball.solidFill); if (ball.x &gt; canvas.width || ball.x &lt; 0 ) { ball.angle = 180 - ball.angle; updateBall(ball); } else if (ball.y &gt; canvas.height || ball.y &lt; 0) { ball.angle = 360 - ball.angle; updateBall(ball); } } } function updateBall(ball) { ball.radians = ball.angle * Math.PI/ 180; ball.xunits = Math.cos(ball.radians) * ball.speed; ball.yunits = Math.sin(ball.radians) * ball.speed; } var numBalls = 80; var maxSize = 15; var minSize = 5; var maxSpeed = maxSize+5; for (var i = 0; i &lt; numBalls; i++) { var tempRadius = Math.floor(Math.random()*maxSize)+minSize; var tempX = tempRadius*2 + (Math.floor(Math.random()*canvas.width)-tempRadius*2); var tempY = tempRadius*2 + (Math.floor(Math.random()*canvas.height)-tempRadius*2); var tempSpeed = maxSpeed-tempRadius; var tempAngle = Math.floor(Math.random()*360); var tempRadians = tempAngle * Math.PI/ 180; var tempXunits = Math.cos(tempRadians) * tempSpeed; var tempYunits = Math.sin(tempRadians) * tempSpeed; var stroke = new goog.graphics.Stroke(3, '#333'); var solidFill = new goog.graphics.SolidFill('#333'); tempBall = {x:tempX,y:tempY,radius:tempRadius, speed:tempSpeed, stroke:stroke, solidFill:solidFill, angle:tempAngle, xunits:tempXunits, yunits:tempYunits} canvas.balls.push(tempBall); } setInterval(drawScreen, 32); } </code></pre>
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