Flash as3在一个点上旋转一个对象

Question

在Flash cc中，我想知道如何制作拖放游戏。但是根据你的拖动，物体会旋转，所以重力会影响它。例如，如果您用拇指和索引在底部拿起一张纸，纸张将会旋转，因此您将其保持在顶部。如何在flash中重新创建它？

到目前为止，这是我的代码...（我是闪光灯的新手，所以请慷慨解答）

var drag:Number = 1;
var BlockAppear = new MovieClip;

gotoAndStop(1, "Minigame-Block");

HeartBear.addEventListener(MouseEvent.MOUSE_DOWN, fl_ClickToDrag_4);

function fl_ClickToDrag_4(event:MouseEvent):void
{
    HeartBear.startDrag()
    gravity = 0
}

stage.addEventListener(MouseEvent.MOUSE_UP, fl_ReleaseToDrop_4);

function fl_ReleaseToDrop_4(event:MouseEvent):void
{
    HeartBear.stopDrag();
    gravity = 0.9
}

{
    var gravity = 0.9;
var floor = 241.3;
HeartBear.y = 710.9;
HeartBear.speedY = 0;
HeartBear.impulsion = 10;
stage.addEventListener(Event.ENTER_FRAME, enterframe);
function enterframe(e:Event) {
    HeartBear.speedY += gravity;
    HeartBear.y += HeartBear.speedY;
    if(HeartBear.y > floor) {
        HeartBear.speedY = 0;
        HeartBear.y = floor

    }

}
stage.addEventListener(KeyboardEvent.KEY_DOWN, space);
function space(e:KeyboardEvent) {
    if(e.keyCode == Keyboard.SPACE) {
        HeartBear.speedY = -HeartBear.impulsion
    }
}
}

Shopclicker.addEventListener(MouseEvent.CLICK, fl_ClickToGoToScene_3);

function fl_ClickToGoToScene_3(event:MouseEvent):void
{
    MovieClip(this.root).gotoAndStop(1, "Shop");
}