I'll keep checking out your app, will report anything I find.
Looks good already, and could be really useful for tile based games for indies :)
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When grabbing the H value with the mouse and moving the mouse to increase the value, I hit the maximum value and the program crashed. I've tried it again to make sure, and it does the same thing: Program freezes and Windows reports it as unresponsive.
You might need to clamp that value between 0 and 359.