forked from: wonderfl KeyVisual V.4.en

-- welcome to wonderfl --
wonderfl is a service where you can build a Flash online.
write Actionscript3 code in a textarea,
and your code will be compiled server side.
Your compiled Flash will be reloaded automatically
in the right side of the page,
so write code and see it real-time.
Well, why not "FORK" this code and see how it goes?

by Kishi 27 Apr 2009

Tags

swirl
Embed

// forked from mash's wonderfl KeyVisual V.4.en
//
//              -- welcome to wonderfl --
//
// wonderfl is a service where you can build a Flash online.
//
// write Actionscript3 code in a textarea,
// and your code will be compiled server side.
//
// Your compiled Flash will be reloaded automatically
// in the right side of the page,
// so write code and see it real-time.
//
// Well, why not "FORK" this code and see how it goes?
//
package {

    import flash.display.Sprite;
    import flash.events.Event;
    import flash.display.BitmapData;
    import flash.display.Bitmap;

    [SWF(backgroundColor="#FFFFFF", frameRate=10)]
    public class FlashTest extends Sprite {

        private var canvas:BitmapData;
        
        private var xp:Vector.<int>;
        private var yp:Vector.<int>;
        private var radius:Vector.<Number>;
        private var theta:Vector.<Number>;
        
        private var pixNum:int;

        public function FlashTest() {
            this.canvas = new BitmapData(200,200,false,0x000000);
            this.addChild(new Bitmap(canvas));
            
            scaleX=scaleY=2;
            
            pixNum = canvas.width*canvas.height;
 
            this.xp = new Vector.<int>();
            this.yp = new Vector.<int>();
            this.radius = new Vector.<Number>();
            this.theta = new Vector.<Number>();
            
            for (var i:int = 0; i<pixNum; i++) {
                xp.push(i % 200);
                yp.push(int(i / 200));
                var dx:Number=100-xp[i];
                var dy:Number=100-yp[i];
                theta.push(Math.atan2(dy, dx));
                radius.push(Math.sqrt(dx * dx + dy * dy)/20);
            }
 
            addEventListener(Event.ENTER_FRAME, onLoop);  
        }
        
        private function onLoop(evt:Event):void {
            this.canvas.lock();
            var n:Number = mouseX / 100;
            for (var i:int = 0; i<pixNum; i++) {
                var swirl:Number = 1+Math.sin(6*Math.cos(radius[i]) -n*theta[i]);
                canvas.setPixel(xp[i], yp[i],  Math.abs(255 - swirl * 255));
            }
            this.canvas.unlock();
        }

    }
}