Lots of changes; I've finally finished my DrawingBox and a test application for it. It is in a relatively good condition now. Maybe there's still something to improve. I also decided to unite my BlackBrush and WhiteBrush and similar classes in one QuickBrush class. My DrawingBox is capable of calculating frames per second now. But it won't go faster than 65 frames per second on my PC. I think it's a windows message dispatcher system limitation. Even when it's at 65 frames per second it doesn't look so smooth somehow... I wonder why is it. But still the quality of image is acceptable.