public void Restore()
{
if (memento != null)
{
X = memento.X;
Y = memento.Y;
memento = null;
}
}
public void DecrementOrdinata()
{
memento = new PositionMemento(X, Y);
Y += MovementActor.GetDecrement() * MovementActor.Speed;
}
public void DecrementAbscissa()
{
memento = new PositionMemento(X, Y);
X += MovementActor.GetDecrement() * MovementActor.Speed;
}