Andy-- Thanks for posting the Bresenham algorithm, and the excellent explanation. >P.S. As though his previous accomplishment weren't enough, in 1977, > Bresenham discovered (and J. Michener later formalized) a > circle-drawing algorithm that's even simpler than his algorithm > for drawing lines. It requires nothing more complicated than > integer addition, subtraction, and multiplication by 4, and it > uses even fewer variables than the line-draw algorithm. > > That Bresenham... What a guy! > >-- >Andrew Warren - fastfwd@ix.netcom.com >Fast Forward Engineering, Vista, California So, whats the circle-drawing algorithm? ;-) Seriously, you don't need to make another long great post if you don't have time. I am mainly interested in the reference you recommend for Bresenham's algorithms. As I said to another person who also responded to my question, >Ironically, the algorithm is not mentioned in my copy of "Introduction to >Algorithms" by Cormen. It is one of my heaviest textbooks from college. It >weighs in at 6.5 pounds! Sincerely, --Maurice ---------------------- Maurice Rabb Totem Consulting (312) 281-6003 totem@mcs.com ----------------------