I've noticed that the transformation matrices that this function builds for rotated screens is not quite correct.
In particular, it consistently builds maps from 0 to width or height instead of from 0 to width-1 or height-1. This means that an inverted screen maps (0,0) to (width,height) instead of (width-1,height-1). This causes out-of-boundary errors when mapping screens. -- Stirling Westrup Programmer, Entrepreneur. https://www.linkedin.com/e/fpf/77228 http://www.linkedin.com/in/swestrup http://technaut.livejournal.com http://sourceforge.net/users/stirlingwestrup
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