forked from: forked from: flash on 2009-3-16

by jared.ruddy 03 Nov 2010

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// forked from hirou's forked from: flash on 2009-3-16
// forked from anabebe's flash on 2009-3-16
  package { 
    import caurina.transitions.Tweener; 
     
    import flash.display.Sprite; 
    import flash.events.*;
    import flash.filters.BitmapFilterQuality; 
    import flash.geom.Point; 


    [SWF(backgroundColor="#000000")] 
    public class Explosion3 extends Sprite 
    { 
        private const RADIUS:uint = 40;  //半径 
        private const MAX_NUM:uint = 30;  //円の個数の最大値 
        private const SIZE:uint = 2;  //円の大きさ 
        private const TIME:Number = 4;  //Tweenerに指定する時間 

        public function Explosion3() 
        { 

             
            addEventListener(Event.ENTER_FRAME, explosion);
        } 
         
        private function explosion(e:Event):void{  //円を飛び散らせる 
            var toPos:Point = new Point();  //円を飛ばす先の座標 
             
            var num:int = Math.floor(Math.random() * MAX_NUM);  //円の個数 
             
            if(num < 2) num = 2; 
             
            var sp2:Sprite = new Sprite; 
            sp2.x = Math.random()* stage.stageWidth/2 + 100; 
            sp2.y = Math.random() * stage.stageHeight/2 + 150; 
            for(var i:int = 0; i < num; i++){ 
                var sp:Sprite = new Sprite; 
                sp.graphics.beginFill(Math.random() * 0xFFFFFF);  //描画 
                sp.graphics.drawCircle(0, 0, 5);   
                sp.graphics.endFill(); 
                sp2.addChild(sp);  //円を全てsp2の上に乗せる 
                toPos.x = RADIUS*Math.cos(2*Math.PI/num * i);  //飛ばす先の座標計算 
                toPos.y = RADIUS*Math.sin(2*Math.PI/num * i); 
                Tweener.addTween(sp, {alpha:0, x:toPos.x, y:toPos.y, time:TIME});  //徐々に消えていく 
            } 
            addChild(sp2); 
            Tweener.addTween(sp2, {rotation: 360, time: TIME});  //sp2を一回転させる 
        } 
    } 
}