/// <summary>
///
/// </summary>
/// <param name="to">starting point of the vector</param>
/// <param name="from">ending point of the vector</param>
public Vector2D(Point2D to, Point2D from)
{
x = to.X - from.X;
y = to.Y - from.Y;
}
/// <summary>
/// Build a new SimpleObject, by it's type and it's position in the room.
/// </summary>
/// <param name="position">the position where the SimpleObject will be placed.</param>
public AbstractSimpleObject(Point2D position)
{
this.position = position;
}