flash on 2011-7-15

/**
 * Copyright yama3 ( http://wonderfl.net/user/yama3 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/r5DD
 */

package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Graphics;
    import flash.display.Sprite;
    import flash.display.Shape;
    import flash.events.Event;
    import flash.geom.Matrix;
    import flash.geom.ColorTransform;
    
    [SWF(width="465", height="465", frameRate="60", backgroundColor="0")]
    
    public class FlashTest extends Sprite {
        private var _canvas:BitmapData;
        private var _bm:Bitmap;
        private var _ctf:ColorTransform = new ColorTransform(.94, .93, .9);
        public function FlashTest() {
            _canvas = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0);
            _bm = new Bitmap(_canvas);
            addChild(_bm);
            addEventListener(Event.ENTER_FRAME, update);            
        }
        
        private function update(e:Event):void
        {
            var line:Shape = new Shape();
            var g:Graphics = line.graphics;
            var pitch:int = 120;
            var len:int = stage.width / 2 * Math.sqrt(4); var r:int=360;
            g.beginFill(0xffffff);
            g.moveTo(-0.5, 0);
            g.lineTo(0.5, 0);
            g.lineTo(0, -0.5);
            g.lineTo(-0.5, 0);
            _canvas.lock();
            _canvas.colorTransform(_canvas.rect, _ctf);
            while(0 < r)
            {
                var x:Number = Math.sin(r*Math.PI / 180) * len + stage.stageWidth/2;
                var y:Number = Math.cos(r*Math.PI / 180) * len +stage.stageHeight / 2;
                var mtx:Matrix = new Matrix();
                mtx.scale(6, Math.random() * len + len / 2);
                mtx.rotate((-r) * Math.PI / 180); mtx.translate(x, y);
                _canvas.draw(line, mtx);
                r -= Math.round(Math.random() * pitch);
            }
            _canvas.unlock();

        }

    }
}