plot(3) library for HPGL plotters

[Henry Spencer]

One minor annoyance of this library that perhaps should have been
mentioned in the posting:  the arc() routine needs both floating-point
and the -lm math library.  It's hard to fix this, since plot(3) and
HPGL have different ideas of how to specify arcs, and the transformation
requires non-trivial trigonometry.  If any masochist out there feels
like figuring out how to do all that without floating-point, I'd be
interested in seeing the result.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry