WPF C# Finding the corners of a transformed RectangleGeometry

I'm trying to do some hit testing on a Rect I've drawn with several RenderTransforms pushed to the Canvas' DrawingContext. I've applied the same rotate/scale/translate transforms to a RectangleGeometry so I can get the bounds of the final drawing. However, the .Bounds property on RectangleGeometry returns the axis-aligned bounding box, while I need the oriented bounding box.

In short, I need some 开发者_运维技巧way to find the corners of the actual transformed rectangle so I can perform hit/collision testing on it.

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Apply the transforms to the points of the rectangle.