Path: utzoo!attcan!uunet!husc6!bloom-beacon!mit-eddie!mit-amt!mit-caf!lee
From: lee@mit-caf.MIT.EDU (Lee Tavrow)
Newsgroups: comp.lang.postscript
Subject: Questions on Fill patterns ...
Message-ID: <1511@mit-caf.MIT.EDU>
Date: 17 Nov 88 22:43:10 GMT
Reply-To: lee@mit-caf.UUCP (Lee Tavrow)
Organization: Microsystems Technology Laboratories, MIT
Lines: 31

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hi.

I am trying to generate fill or stipple patterns in postscript.  The
ps cookbook shows you a way to do this.  The problem is that I
want the overlapping fill patterns to be "or"ed together instead of
the top pattern completely erasing the bottom one.  For example, I
want:

  x   x   x   x              x   x   x   x          x   x   x   x
   x   x   x                x   x   x   x          x x x x x x x x
    x   x   x      over    x   x   x   x   ==>    x   x   x   x   x
 x   x   x   x            x   x   x   x            x x x x x x x x 

etc...

The only command that I could find in the ps manual which did something
vaguely related was "imagemask" instead of "image" where "imagemask"
is transparent, as the manual says.

Any ideas??????

Also, does anyone know how to give poscript a bunch of overlapping
polygons and have postscript spit back a path which is the outline
of the polygons?????

Please send mail directly to me (in addition to this file if you want to)

thanks in advance,
lee