package {
     
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    import flash.events.Event;
     
     
    public class Easing3 extends Sprite {
         
        var arrBall:Array ;
        var targetX:Number ;
        var targetY:Number;
        var easing:Number = 0.3;
        var firstBall:Ball;
         
        public function Easing3():void{                 
            init();
        }
         
        private function init():void{
            arrBall = new Array(30);
            for(var i:uint=0,j:uint=arrBall.length;i<j;i++){
                arrBall[i] = new Ball(10,Math.random() * 0xffffff);             
                addChild(arrBall[i]);
            }           
             
            firstBall = arrBall[0];
            firstBall.x = Math.random() * stage.stageWidth;
            firstBall.y = Math.random() * stage.stageHeight;
             
            targetX = stage.stageWidth/2;
            targetY = stage.stageHeight/2;
             
            stage.addEventListener(MouseEvent.MOUSE_DOWN,MouseDownHandler);
            addEventListener(Event.ENTER_FRAME,EnterFrameHandler);          
        }
         
        private function MouseDownHandler(e:MouseEvent):void{
            targetX = mouseX;
            targetY = mouseY;
            addEventListener(Event.ENTER_FRAME,EnterFrameHandler);  
        }
         
        private function EnterFrameHandler(e:Event):void{           
            firstBall.vx = (targetX - firstBall.x) * easing;
            firstBall.vy = (targetY - firstBall.y) * easing;
            firstBall.x += firstBall.vx;
            firstBall.y += firstBall.vy;
             
            for(var i=1,j=arrBall.length;i<j;i++){
                var ball:Ball = arrBall[i];
                ball.vx = (arrBall[i-1].x-ball.x)*easing;
                ball.vy = (arrBall[i-1].y-ball.y)*easing;
                ball.x += ball.vx;
                ball.y += ball.vy;
            }
             
            var lastBall:Ball = arrBall[arrBall.length-1];
            var dx = lastBall.x - targetX;
            var dy = lastBall.y - targetY;
            var dist = Math.sqrt(dx*dx + dy*dy);
             
            trace(dist);
            if (dist<=10){
                removeEventListener(Event.ENTER_FRAME,EnterFrameHandler);
            }           
        }
    }
}