package
{
 import flash.display.Sprite;
 import flash.events.Event;
 
 public class animation_ch05_FollowMouse2 extends Sprite
 {
  private var arrow:animation_ch05_Arrow;
  private var vx:Number = 0;
  private var vy:Number = 0;
  private var force:Number = 0.5;
  
  public function animation_ch05_FollowMouse2()
  {
   init();
  }
 //@ init(s) 
  private function init():void
  {
   arrow = new animation_ch05_Arrow();
   addChild(arrow);
   addEventListener(Event.ENTER_FRAME, onEnterFrame);
  }
//@ frame(s)
  private function onEnterFrame(event:Event):void
  {
   var dx:Number = mouseX - arrow.x;
   var dy:Number = mouseY - arrow.y;
   var angle:Number = Math.atan2(dy, dx);
   arrow.rotation = angle * 180 / Math.PI;
   var ax:Number = Math.cos(angle) * force;
   var ay:Number = Math.sin(angle) * force;
   vx += ax;
   vy += ay;
   arrow.x += vx;
   arrow.y += vy;
  }
 }
}