package {
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    [SWF( width = "550", height = "400", frameRate = "30", backgroundColor = "0x000000" )]
    public class 粒子喷射 extends Sprite {
        private var count:int=3000;
        private var wind:Number=0.0;

        private var gravity:Number=0.3;
        private var balls:Array;
        //public function Fountain() {
        public function 粒子喷射() {
            init();
        }
        private function init():void {
            stage.scaleMode=StageScaleMode.NO_SCALE;
            stage.align=StageAlign.TOP_LEFT;
            balls = new Array();
            for (var i:int = 0; i < count; i++) {
                var ball:Ball=new Ball(1,0xffffff);
                ball.x=stage.stageWidth/2;
                ball.y=stage.stageHeight;
                ball.vx = (Math.random()*2-1) * 1.5 + wind;
                ball.vy=-5+Math.random()*-10;
                addChild(ball);
                balls.push(ball);
            }
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        private function onEnterFrame(event:Event):void {
            wind = -1*(mouseX - stage.stageWidth/2)/200;
            for (var i:Number = 0; i < balls.length; i++) {
                var ball:Ball=Ball(balls[i]);
                ball.vy+=gravity;
                ball.x+=ball.vx;
                ball.y+=ball.vy;
                if (ball.x > stage.stageWidth + ball.radius || ball.x < -ball.radius || ball.y >stage.stageHeight + ball.radius || ball.y<-ball.radius) {
                    ball.x=stage.stageWidth/2;
                    ball.y=stage.stageHeight;
                    ball.vx = (Math.random()*2-1) * 1.5 + wind;
                    ball.vy=-5+Math.random()*-10;
                }
            }
        }
    }
}