Matrix3x2 GetDirectionTransform()

in ExampleGallery/TextDirectionControl.cs [136:179]
35 lines of code
9 McCabe index (conditional complexity)

            Matrix3x2 GetDirectionTransform(CanvasTextDirection direction)
            {
                var arrowBounds = arrow.ComputeStrokeBounds(4);
                var arrowCenter = new Size(arrowBounds.Width, arrowBounds.Height).ToVector2() / 2;
                Matrix3x2 directionTransform = Matrix3x2.Identity;

                switch (direction)
                {
                    case CanvasTextDirection.LeftToRightThenTopToBottom:
                        directionTransform = Matrix3x2.Identity;
                        break;

                    case CanvasTextDirection.RightToLeftThenTopToBottom:
                        directionTransform = Matrix3x2.CreateScale(-1, 1);
                        break;

                    case CanvasTextDirection.LeftToRightThenBottomToTop:
                        directionTransform = Matrix3x2.CreateScale(1, -1);
                        break;

                    case CanvasTextDirection.RightToLeftThenBottomToTop:
                        directionTransform = Matrix3x2.CreateScale(-1, -1);
                        break;

                    case CanvasTextDirection.TopToBottomThenLeftToRight:
                        directionTransform = Matrix3x2.CreateRotation((float)Math.PI / 2) * Matrix3x2.CreateScale(-1, 1);
                        break;

                    case CanvasTextDirection.BottomToTopThenLeftToRight:
                        directionTransform = Matrix3x2.CreateRotation((float)-Math.PI / 2);
                        break;

                    case CanvasTextDirection.TopToBottomThenRightToLeft:
                        directionTransform = Matrix3x2.CreateRotation((float)Math.PI / 2);
                        break;

                    case CanvasTextDirection.BottomToTopThenRightToLeft:
                        directionTransform = Matrix3x2.CreateRotation((float)-Math.PI / 2) * Matrix3x2.CreateScale(-1, 1);
                        break;
                }

                directionTransform = Matrix3x2.CreateTranslation(-arrowCenter) * directionTransform * Matrix3x2.CreateTranslation(arrowCenter);
                return directionTransform;
            }