forked from: Function Use

/**
 * Copyright bradsedito ( http://wonderfl.net/user/bradsedito )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/qKM4
 */

// forked from shapevent's Function Use
package {

    import flash.display.*;
    import flash.events.*;
    import flash.filters.BlurFilter;

    [SWF(width = 500, height=500)]

       public class FunctionUse extends MovieClip {
        private var canvas:BitmapData;
        private var walkerNum:int;
        private var walkers:Vector.<Function>;
        private var blurr:BlurFilter = new BlurFilter(3,3,3);

               public function FunctionUse(){
                  // init
            
            canvas = new BitmapData(800,800,false, 0x000000);
            addChild(new Bitmap(canvas,"auto",true));
            scaleX = scaleY = 500 / 800
             
            
            walkerNum = 250;
            walkers = new Vector.<Function>(walkerNum, true);
            
            makeWalkers();
            runWalkers();

               }
               // private methods

        private function makeWalkers():void{
            for (var i:int = 0; i<walkerNum; i++){
                walkers[i] = makeWalker();
            }
        }
        private function runWalkers():void{
            addEventListener(Event.ENTER_FRAME, onRun);
        }
        private function onRun(evt:Event):void{
            for (var i:int = 0; i<walkerNum; i++){
                walkers[i]();
            }
        }
        private function makeWalker(xp:Number=400, yp:Number=400):Function{
            var x:Number = xp, y:Number = yp;
            var z:Number = z*(Math.random());
            var rad:Number = Math.random() * 4;
            var theta:Number = Math.random() * Math.PI * 2;
            var speed:Number = 0.01 * Math.random() * 2
            if (int(Math.random() * 2) == 1){
                speed *= -100;
            }
            this.filters = [blurr];
            canvas.scroll( 30, -30);
            canvas.scroll(-30,  30);            
            return function():void{
                x += rad * Math.cos(theta);
                y += rad * Math.sin(theta);
                theta += speed
                if (int(Math.random() * 100) == 1){
                    theta = Math.random() * Math.PI * 2;
                } 
                if (x > 800 || x < 0 || y > 800 || y < 0){
                    x = xp, y = yp;
                }
                canvas.setPixel32(x, y, 0xFFFFFF*Math.random());
                
            }
        }
        

       }

}