Don't worry, 68k assembly is easier to read than x86 assembly. This code is nicely structured and heavily commented. Don Knuth called Atkinson's QuickDraw and MacPaint code some of the best ever written.

Of course, if I'd actually read the code before linking to it, I'd have realized that this file doesn't really answer avgarrison's question because the algorithm is in DrawArc.a (see Luc's post earlier in this thread for an archive with the rest of the files).

Should we take it from your username and the comment about 68k assembly that you've played with the MC68332 a bit or is it just coincidence :-)

Haha, just coincidence :-)