The Old New Thing

SubtractRect doesn't always give you the exact difference

September 18, 2013 Sep 18, 2013 09/18/13

Raymond Chen

The function takes a source rectangle and subtracts out the portion which intersects a second rectangle, returning the result in a third rectangle. But wait a second, the result of subtracting one rectangle from another need not be another rectangle. It might be an L-shape, or it might be a rectangle with a rectangular hole. How does this ...