as3 滑鼠X移動方向 Y移動方向 觸發不同事件

var mymouseX:int ;
stage.addEventListener(MouseEvent.MOUSE_MOVE,move1)
function move1(e:Event) {   
    var myNewmouseX:int = mouseX ;
    if(myNewmouseX > mymouseX){
    trace("事件1")
    B_plan_pic.nextFrame();
      }else{
    trace("事件2")
    B_plan_pic.prevFrame();
    }
mymouseX  = myNewmouseX ;
}