TweenPropertyAccessor2D animate

Accessor for 2D properties like x, y, rotation, alpha and others which can be animated with this tween. Works for all display objects.

Source 

TweenPropertyAccessor2D get animate {
  var tweenObject = _tweenObject;
  if (tweenObject is TweenObject2D) {
    return new TweenPropertyAccessor2D._(this, tweenObject);
  } else {
    throw new StateError("Invalid tween object for 2D animation.");
  }
}