Graphics Flash ActionScript

package {
    import flash.display.Sprite;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.events.Event;
    import flash.geom.Point;
    public class Main extends Sprite {
        private var _bitmap:BitmapData= new BitmapData(stage.stageWidth,stage.stageHeight,false,0xffffffff);
        private var _image:Bitmap = new Bitmap(_bitmap);
        private var _seed:Number = 10000;
        private var _pixelCount:int = 0;
    
        public function Main(  ) {
            addChild(_image);
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
    
        public function onEnterFrame(event:Event):void {
            _seed = _bitmap.pixelDissolve(_bitmap,
                                       _bitmap.rect,
                                       new Point(  ),
                                       _seed, 
                                       1000,
                                       0xff000000);
            _pixelCount += 1000;
            if(_pixelCount > _bitmap.width * _bitmap.height)
            {
                removeEventListener(Event.ENTER_FRAME, onEnterFrame);
            }
        }
    }
}