Isometric Map To Screen

        public Vector2 MapToScreen(Vector2 source)
        {
            switch (CameraDirection)
            {
                case FaceDirection.NorthWest:
                    return new Vector2(source.X * GameConstants.CellHalfWidth - source.Y * GameConstants.CellHalfWidth,
                        source.X * GameConstants.CellHalfHeight + source.Y * GameConstants.CellHalfHeight);
                case FaceDirection.EastNorth:
                    return new Vector2(source.Y * GameConstants.CellHalfWidth + source.X * GameConstants.CellHalfWidth,
                        source.Y * GameConstants.CellHalfHeight - source.X * GameConstants.CellHalfHeight);
                case FaceDirection.SouthEast:
                    return new Vector2(source.Y * GameConstants.CellHalfWidth - source.X * GameConstants.CellHalfWidth, -(source.X * GameConstants.CellHalfHeight + source.Y * GameConstants.CellHalfHeight));
                case FaceDirection.WestSouth:
                    return new Vector2(-(source.X * GameConstants.CellHalfWidth + source.Y * GameConstants.CellHalfWidth), source.X * GameConstants.CellHalfHeight - source.Y * GameConstants.CellHalfHeight);
            }
        }