public void ChangeSizeTo(Vector2 endSize, float duration, bool smooth, string onCompletionMessage) {
_sizeInterval = new Vector2Interval(Size, endSize, duration, smooth);
_sizeIntervalMessage = onCompletionMessage;
}
public void MoveTo(Vector2 destination, float duration, bool smooth, string onCompletionMessage)
{
_positionInterval = new Vector2Interval(Position, destination, duration, smooth);
_positionIntervalMessage = onCompletionMessage;
}