Faire glisser les objets sur un même cible?

var urlPaths:Array = Array("gallery1.swf", "gallery2.swf", "gallery3.swf", "gallery4.swf");
var crtDraggedObject:MovieClip = null;
var crtObject:MovieClip;

for (var objIndex = 0; objIndex < objCount; objIndex++) {
    crtObject = this.getChildByName("thumb"+objIndex+"_mc") as MovieClip;
    crtObject.dropped = false;
    crtObject.dragging = false;
    crtObject.urlPath = urlPaths[objIndex];
    crtObject.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
}

var imageLoader:Loader = new Loader();

function loadGallery(urlPath) {
    imageLoader.unload();
    var imageRequest:URLRequest = new URLRequest(urlPath);
    imageLoader.load(imageRequest);
    imageLoader.y = 59;
    addChild(imageLoader);
}

/**********************************************************************/

//This variable tells whether the user is dragging or not
var dragging:Boolean = false;

//Spring variable (how strong the spring effect is)
var springFactor:Number = 0.2;

//Friction for the animatiom
var friction:Number = 0.59;//originally 0.9

//x and y speeds
var speedX:Number = 0.0005;//originally 0
var speedY:Number = 0.0005;//originally 0

//acceleration for x and y speeds
var accX:Number = 0.0005;
var accY:Number = 0.0005;

//Overall speed
var speed:Number = 0.5;//originally 10

//Add event listeners for the MOUSE_DOWN and MOUSE_UP
//events, so we know when to start/stop dragging.
crtDraggedObject.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
stage.addEventListener(MouseEvent.MOUSE_UP, mouseReleasedHandler);

//Add ENTER_FRAME which animates the ball movement
addEventListener(Event.ENTER_FRAME, moveBall1);

//This function is called when the user presses the mouse on the ball
function mouseDownHandler(e:MouseEvent):void {
    crtDraggedObject = e.target as MovieClip;
    dragging = true;
    crtDraggedObject.dropped = false;
}
//This function is called when the user releases the mouse
function mouseReleasedHandler(e:MouseEvent):void {
    dragging = false;

    if (!crtDraggedObject.dropped) {
        if (crtDraggedObject.hitTestPoint(mcDropPoint.x, mcDropPoint.y)) {
            crtDraggedObject.dropped = true;
            loadGallery("galleryinteraction1.swf");
        }
    }
}
function moveBall1(event:Event):void {

    //We only move the ball when the user is dragging
    if (dragging) {

        //Calculate the x and y distances from the ball to the mouse
        var distanceX:Number = mouseX - crtDraggedObject.x;
        var distanceY:Number = mouseY - crtDraggedObject.y;

        //Update x and y accelerations
        accX = distanceX * springFactor;
        accY = distanceY * springFactor;

        //Add the acceleration to the speed
        speedX += accX;
        speedY += accY;

        //Add friction, otherwise the animation
        //would go on forever.
        speedX *= friction;
        speedY *= friction;

        //Move the ball to the new coordinates (closer to the mouse)
        crtDraggedObject.x += speedX;
        crtDraggedObject.y += speedY;
    }
}

/**********************************************************************/

//We use this timer to create a trail ball each 0.03 seconds
var timer:Timer = new Timer(10,1400000);//originally 30,400000
timer.addEventListener(TimerEvent.TIMER, createTrailBall);
timer.start();

//This function is called by the timer
function createTrailBall(e:Event):void {
    crtDraggedObject = null;
    
    //Create a new ball instance
    var trailBall1:Ball1=new Ball1();

    //Position the trail ball in the same position where the original ball is located
    trailBall1.x = crtDraggedObject.x;
    trailBall1.y = crtDraggedObject.y;

    //Add ENTER_FRAME to animate the trail ball
    trailBall1.addEventListener(Event.ENTER_FRAME,animateTrailBall);

    /*
    Add the trail ball on to the stage.
    We don't want to position the trail ball on top of the original ball.
    We use the addChildAt method to set the index to 0.
    */
    addChildAt(trailBall1,0);
}
function animateTrailBall(e:Event):void {

    //In each frame, reduce the alpha and the scale of the trail ball.
    e.target.alpha -= 0.1;
    e.target.scaleY -= 0.1;
    e.target.scaleX -= 0.1;

    /*
    If the alpha is less than 0, we remove the trail ball from the
    stage.
    */
    if (e.target.alpha < 0) {
        e.target.removeEventListener(Event.ENTER_FRAME,animateTrailBall);
        removeChild((MovieClip)(e.target));
    }
}