WarTornLands.Infrastructure.ResolutionIndependence.MagicSprite.GetDrawingRec C# (CSharp) Method

        private void GetDrawingRec()
        {
            int portWidth = _grahpics.Viewport.Width;
            int portHeight = _grahpics.Viewport.Height;

            #region Case both width and height are specified

            if (_relWidth != null && _relHeight != null)
            {
                int width = (int)(portWidth * _relWidth);
                int height = (int)(portHeight * _relHeight);
                int x = (int)(portWidth * _relPosition.X - (float)width * (.5f + .5f * _panning.X));
                int y = (int)(portHeight * _relPosition.Y - (float)height * (.5f + .5f * _panning.Y));

                _rec = new Rectangle(
                   x,
                   y,
                   width,
                   height);

                CheckOverride();

                return;
            }
            #endregion

            #region Case only width is specified

            if (_relWidth != null && _relHeight == null)
            {
                float spriteAspectRatio = (float)_sprite.Height / (float)_sprite.Width;

                int width = (int)(portWidth * _relWidth);
                int height = (int)(portWidth * _relWidth * spriteAspectRatio);
                int x = (int)(portWidth * _relPosition.X - (float)width * (.5f + .5f * _panning.X));
                int y = (int)(portHeight * _relPosition.Y - (float)height * (.5f + .5f * _panning.Y));

                _rec = new Rectangle(
                    x,
                    y,
                    width,
                    height);

                CheckOverride();

                return;
            }
            #endregion

            #region Case only height is specified

            if (_relWidth == null && _relHeight != null)
            {
                float spriteAspectRatio = _sprite.Width / _sprite.Height;

                int width = (int)(portHeight * _relHeight * spriteAspectRatio);
                int height = (int)(portHeight * _relHeight);
                int x = (int)(portWidth * _relPosition.X - (float)width * (.5f + .5f * _panning.X));
                int y = (int)(portHeight * _relPosition.Y - (float)height * (.5f + .5f * _panning.Y));

                _rec = new Rectangle(
                    x,
                    y,
                    width,
                    height);

                CheckOverride();

                return;
            }
            #endregion

            throw new Exception("Sprite dimensions not specified.");
        }