package {
    import flash.display.*;
    import mx.effects.Tween;
    import mx.effects.easing.Linear;
    
    // This version of the Animator class uses the Flex framework's Tween 
    // class to perform animations
    public class @ax-actionscript-lib-animation-Animator_TweenVersion {
      private var xTween:Tween;
      private var yTween:Tween;
      private var target:DisplayObject;
  
      public function @ax-actionscript-lib-animation-Animator_TweenVersion (target:DisplayObject) {
        this.target = target;
      }    
  
      public function animateTo (toX:Number, toY:Number, 
                                 duration:Number):void {
        if (xTween != null && yTween != null) {
          xTween.pause();
          yTween.pause();
        }
        xTween = new Tween(target, target.x, toX, duration);
        xTween.setTweenHandlers(xUpdate, xUpdate);
        yTween = new Tween(target, target.y, toY, duration);
        yTween.setTweenHandlers(yUpdate, yUpdate);
        xTween.easingFunction = Linear.easeNone;
        yTween.easingFunction = Linear.easeNone;
      }
  
      private function xUpdate (val:Number):void {
        target.x = val;
      }
      
      private function yUpdate (val:Number):void {
        target.y = val;
      }
    }
  }