Path: utzoo!utgpu!water!watmath!clyde!rutgers!rochester!PT.CS.CMU.EDU!andrew.cmu.edu!cm26+ From: cm26+@andrew.cmu.edu (Curt McDowell) Newsgroups: comp.graphics Subject: Re: Line Drawing Algorithms Message-ID: Date: 11 Jan 88 03:18:27 GMT Organization: Carnegie Mellon University Lines: 30 In-Reply-To: <2801@watcgl.waterloo.edu> >Do we need stuff like this posted to the world? This was a follow-up posting >to an article that cited Bresenham's algorithm and Foley and Van Dam's book >as references. Anyone reading F&VD can find out what DDA means. This seems >the minimal effort one should make before posting an article that purports >to have technical information. Actually, I think it's responses such as yours that the world does not need. They're SUCH a pain, especially when they're wrong. The post you are maligning happened to contain an important point not to be found in Foley (and certainly not in your so enlightening post). It's the idea of building the point-plot routine into the line drawing routine. I have 68000 routines for Suns that uses this technique, besides splitting the algorithm into 8 cases, yielding a speedup factor of at least 50 or 60 times over the bare one mentioned in Foley. The exact algorithm may be found in Foley, but details such as this may not. I'd just hate to see people stop posting useful stuff on account of people with your negative outlook. Curt McDowell Carnegie-Mellon U. P.S. I also owned a TRS-80 and I agree with Gary. P.P.S. DDA stands for differential something or other, right?