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Many of the above libraries are low level. If you want to
calculate line intersections etc then you will need more routines.
The C source code from Graphics Gems by Andrew Glassner (ed.),
Press 1990) is online, (in /export/Examples/graphics - see the
top-level README file for details). You'll also find a few fortran
routines there. Contact Pete Clarkson (pkc@eng) for more details.
Further information is available in the online help system. The Graphics help page
is a good place to start
searching from. Online handouts for
are in the help system too.
Some example code is down in /export/Examples.