graphviz package in my contrib is (I believe) documented here:
http://www.graphviz.org/
> Would that be the right choice when I care mostly drawing areas filled with
> color and pattern, with some basic text functions?
sounds like a job for pic(1) - A friend of troff. Troff has a postscript
backend,
and you can generate postscript files using somthing like:
pic drawing.ms | troff -ms | lp -d stdout > drawing.ps
and then, if you like
ps2pdf drawing.ps > drawing.pdf
-Steve
