simon@einode.UUCP (Simon Kenyon) (11/11/86)
> > In article <7291@utzoo.UUCP> henry@utzoo.UUCP (Henry Spencer) writes: >>To quote from "Hardware/Software Trade-offs for Bitmap Graphics >>on the Blit", Pike/Locanthi/Reiser, Software-Practice&Experience Feb 1985: >> >>" ... All bitmaps share a single >>coordinate space, with (0,0) in the upper left. ... " > > Ah, but in the ACM TOG, Apr 1983 Rob used 1st-quadrant. It is worth > noting that almost all the algorithms are independent of this convention. > (Exercise: Find the one that isn't.) i'm told, but i haven't had the heart to look, that where it bites you in the bum is in scrolling. apparently, my layers implementation got that wrong, so i assume that that is where the dependency lies. [the mental scars of getting what i did get working working still have not healed] -- Simon Kenyon EUnet: simon@einode.UUCP Smail: The National Software Centre, Dublin, IRELAND Phone: +353-1-716255 EUnet is a registered trademark of the EUUG