flash跟随鼠标图片缓动效果

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做了一个跟随鼠标缓动效果，代码如下，并有解释

var a_X:Number;
var a_Y:Number;
var c_X:Number;
var c_Y:Number;
var speed:Number =10;
var len:Number = 300;
this.addEventListener(Event.ENTER_FRAME,ac);
function ac(me:Event):void{
 //trace(stage.mouseX);首先获star位置
 //Mouse.hide();
 c_X = stage.mouseX - star.x;
 c_Y = stage.mouseY - star.y;
    //a_X = Math.abs(c_X)>len?speed:(Math.abs(c_X)/len)*speed;
 //a_Y = Math.abs(c_Y)>len?speed:(Math.abs(c_Y)/len)*speed;
 a_X = (Math.abs(c_X)/len)*speed;
 a_Y = (Math.abs(c_Y)/len)*speed;
 if(c_X<0)a_X = -a_X;
 if(c_Y<0)a_Y = -a_Y;
 star.x = Math.abs(c_X)<0.1?stage.mouseX:star.x + a_X;
 star.y = Math.abs(c_Y)<0.1?stage.mouseY:star.y + a_Y;
 }

效果如下：