How to Implement a Basic Bitmap Brush
To go along with this article I have created some sample code that will demonstrate everything I talk about. It’s a mixture of Cocoa and Quartz, although the ideas should work in any environment; only the API calls will change. This is within reason of course: Quartz takes care of a lot of complicated things like alpha blending and antialiasing, and if your API (like QuickDraw, GDI) can’t deal with that, then you’ll have a lot more work to do.
