Actionscript:
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stage.frameRate = 30;
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var imageNum:int = 10000;
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var point:Point = new Point(0,0);
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var s:Sprite = new Sprite();
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s.graphics.beginFill(0xCCCCCC);
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s.graphics.lineStyle(0,0x000000);
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s.graphics.drawCircle(3,3,3);
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s.alpha = .1;
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var nested:Sprite = new Sprite();
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nested.addChild(s);
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var image:BitmapData = new BitmapData(s.width, s.height, true, 0x00000000);
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image.draw(nested);
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var canvas:BitmapData = new BitmapData(400,400, true, 0xFFFFFFFF);
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addChild(new Bitmap(canvas));
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var xPos:Array = new Array();
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var yPos:Array = new Array();
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for (var i:int = 0; i<imageNum; i++) {
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xPos.push(Math.random()*400);
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yPos.push(Math.random()*400);
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}
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addEventListener(Event.ENTER_FRAME, onLoop);
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function onLoop(evt:Event):void {
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canvas.fillRect(new Rectangle(0,0,400,400), 0xFFFFFFFF);
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var div:Number;
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for (var i:int = 0; i<imageNum; i++) {
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div = (i / 100)+2;
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xPos[i] += (mouseX - xPos[i])/div;
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yPos[i] += (mouseY - yPos[i])/div;
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point.x = xPos[i];
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point.y = yPos[i];
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canvas.copyPixels(image, image.rect, point, null, null, true);
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}
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}
This is from my other blog but I figured it was worth posting here. It draws 10'000 transparent circles that each follow the mouse at different speeds. This is achieved using copyPixels().