flash on 2009-5-16

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

    packpackage {

    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    import flash.text.*;
    import caurina.transitions.Tweener;

    public class Cirecle extends Sprite{
        
        public function Cirecle():void{
        stage.ddEventListener("click", clickHandler);
        }
        
        private function clickHandler(event:MouseEvent):void
        
        //花火作成
        var SPEED_FO:Number = 0.9;
        var canvas_bd:BitmapData;
        var ctf:ColorTransform;
        var temp:Sprite;
        var tf:TextField;
        
        public function FireFlower () {
        addEventListener( MouseEvent.CLICK, added );
        }
        
        private function added( e:Event ):void {
        if ( e.target == this ) {
        removeEventListener( e.type, arguments.callee );
                
        stage.quality = StageQuality.LOW;
        stage.frameRate = 60;
                
        setup();   
            }    
        }

        
        private function setup():void {
        canvas_bd = new BitmapData( stage.stageWidth,            
        stage.stageHeight, false, 0x000000 );
        addChild( new Bitmap( canvas_bd ) );
            
        ctf = new ColorTransform( SPEED_FO, SPEED_FO, SPEED_FO, 1.0 );
        temp = new Sprite();
            
        tf = new TextField();
        tf.x = 5;
        tf.y = 5;
        tf.textColor = 0xffffff;
        tf.mouseEnabled = false;
        addChild( tf );
            
        addEventListener( Event.ENTER_FRAME, update, false, 10 );
        Tweener.addTween( this, { time:0.5, onComplete:createFlower } );
        }
        
        private function update( e:Event ):void {
        canvas_bd.unlock();
        canvas_bd.lock();
        canvas_bd.colorTransform( canvas_bd.rect, ctf );
            
        tf.text = temp.numChildren.toString();
        }
        
        private function createFlower():void {
        var cx:Number = stage.stageWidth/4 + stage.stageWidth/2*Math.random();
        ar cy:Number = stage.stageHeight/4 + stage.stageHeight/2*Math.random();
        var color:uint = [0xff6666, 0xffff66, 0x66ff66, 0x66ffff][Math.floor(3*Math.random())];
            
        for ( var i:int = 0; i < 256; ++i ) {
        fire( cx, cy, color );
            }
            
        Tweener.addTween( this, { time:5+5*Math.random(), onComplete:createFlower } );
        }
        
        private function fire( cx:Number, cy:Number, color:uint ):void {
        var x:Number = cx;
        var y:Number = cy;
        var v:Number = 2*Math.random();
        var r:Number = 2*Math.PI * Math.random();
            
        var vx:Number = v * Math.cos( r );
        var vy:Number = v * Math.sin( r );
        var vr:Number = 0.02;
        var dir:Number = 1 - 2*Math.floor( 2*Math.random() );
            
        var count:int = 0;
        var size:Number = 1;
        var rect:Rectangle = new Rectangle( x, y, 2*size, 2*size );
            
        var bullet:Sprite = new Sprite();
        temp.addChild( bullet );
            
        bullet.addEventListener( Event.ENTER_FRAME, function( e:Event ):void {
        vy += 0.01;
        x += vx;
        y += vy;
        rect.x = x - size;
        rect.y = y - size;
                
        count++;
                
        if ( Math.random() < Math.max( 0.05, 1-count/100 ) ) {
        canvas_bd.fillRect( rect, color );
                }
               
        if ( ( count > 120 ) || ( canvas_bd.rect.contains( x, y ) == false ) ) {
        bullet.removeEventListener( e.type, arguments.callee );
        bullet.graphics.clear();
        temp.removeChild( bullet );
        bullet = null;
                }
            }, false, 1 );
        }
    }
}