package {

  //forked from http://wonderfl.net/c/sM3y/

    import flash.display.Sprite;

    import flash.display.Bitmap;

    import flash.display.BitmapData;

    import flash.events.Event;

    import flash.filters.GlowFilter;

    import flash.filters.BlurFilter;

    import flash.display.BlendMode;

    import flash.geom.ColorTransform;

    [SWF(width = "900", height = "900", backgroundColor = "0x000000", frameRate = "30")]

    public class FlashTest extends Sprite {

            public var layer:Array = new Array();

        public function FlashTest() {

                layer[0] = new Bitmap(new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000));

            layer[0].filters = [new BlurFilter(2,2,1)]

            layer[1] = new Sprite();

            layer[1].filters = [new BlurFilter(2,2,1), new GlowFilter(0x4411ff, 1, 32, 32, 8, 3)]

            addChild(layer[0]);

            addChild(layer[1]);

                addEventListener(Event.ENTER_FRAME, loop);

        }

        public function loop(e:Event):void{

                lightning(layer[1]);

                var cash:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000);

                cash.draw(this, null, new ColorTransform(1,1,1,0.9), BlendMode.ADD);

               layer[0].bitmapData = cash;

        }

        public function lightning(tg:Sprite):void{

                var xx:Number = mouseX;

                var yy:Number = mouseY;

                var th:Number = random(2) +1

                tg.graphics.clear();

                tg.graphics.moveTo(xx, yy);

                while(yy < stage.stageHeight){

                    xx += random(20) * (random(2)*2 -1);

                    yy += random(30) + 4    ;

                    tg.graphics.lineStyle(th,0xffffff,1);

                    tg.graphics.lineTo(xx,yy);

                }

        }