sbw@naucse.UUCP (Steve Wampler) (03/05/87)
I recently posted some questions about the correctness of
the published version of Liang and Barsky's polygon clipping
algorithm. Some more thought has convinced that it does
not handle vertical and horizontal lines properly. I made
a patch to the algorithm and now have it running (the patch
actually simplifies the code, though I hesitate to call it
a fix, since it's ugly).
In any event, if I'm correct (remember I'm desparate, and
desparate people believe anything), this must have come up
before. I would still appreciate being pointed to a proper
fix.
Thanks!
Steve Wampler
{.....!arizona!naucse!sbw}martin@topaz.rutgers.edu.UUCP (05/16/87)
To: comp.graphics Subject: Implementing Fat Lines Newsgroups: comp.graphics Organization: Rutgers Univ., New Brunswick, N.J. Cc: Bcc: I am looking for references or pointers on implementing fat lines -- I have a program working for "nice" lines with mitre joints, but I have found that there are a lot of not so nice lines that create problems. I'm just wondering how other people have dealt with fat lines, rounded joints, and fat lines that have outlines on them. I'm curious because I never see any references to the problem anywhere, but fat lines seem to be pretty common. Thanks for any help, Liz Martin
roy@phri.UUCP (Roy Smith) (05/17/87)
In article <12028@topaz.rutgers.edu> martin@topaz.rutgers.edu writes: > I am looking for references or pointers on implementing fat lines [...] > I'm just wondering how other people have dealt with fat lines, rounded > joints, and fat lines that have outlines on them. Check out PostScript's solution. In particular, look up "stroke", "setlinewidth", "setlinejoin", "setlinecap", and "setmiterlimit" in "PostScript Language Reference Manual" from Adobe/Addison-Wesley. The PostScript method may not be what you're looking for but it's interesting and worth knowing about. -- Roy Smith, {allegra,cmcl2,philabs}!phri!roy System Administrator, Public Health Research Institute 455 First Avenue, New York, NY 10016