Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!nntp.club.cc.cmu.edu!micro-heart-of-gold.mit.edu!bloom-beacon.mit.edu!bloom-beacon.mit.edu!panix!not-for-mail
From: JohnF <john@please.see.sig.for.email.com>
Newsgroups: comp.lang.postscript
Subject: Does overwriting a line write it twice?
Date: Mon, 1 Dec 2014 12:40:28 +0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
Lines: 28
Message-ID: <m5hnjs$nml$1@reader1.panix.com>
NNTP-Posting-Host: panix3.panix.com
X-Trace: reader1.panix.com 1417437628 24277 166.84.1.3 (1 Dec 2014 12:40:28 GMT)
X-Complaints-To: abuse@panix.com
NNTP-Posting-Date: Mon, 1 Dec 2014 12:40:28 +0000 (UTC)
User-Agent: tin/2.0.0-20110823 ("Ardenistiel") (UNIX) (NetBSD/6.1.5 (i386))
Xref: csiph.com comp.lang.postscript:2104

Suppose you mave something like
  r1 g1 b1 setrgbcolor
  w1       setlinewidth
  x1 y1    moveto
  x2 y2    lineto
  r2 g2 b2 setrgbcolor
  w2       setlinewidth  %%% with w2<w1
  x1 y1    moveto        %%% ----------
  x2 y2    lineto
So you're drawing a different color narrower line 
inside a wider line.
   Does this line get written twice? In particular,
if printed on an inkjet, is ink laid down along the
entire w1-wider line, and then ink laid down again
on top of that along the w2-narrower line?
   If so, would a ps2pdf (and then printing the pdf)
stop that? Or how would you stop that from happening?
That is, just lay down ink once, in color r2,g2,b2
inside the w2-narrower line, and in color r1,g1,b1
along the outside edges between w2 and w1.
   gv'ing a ps file with those instructions looks
like the narrow-inside-wide line is only written once,
but I can't slow down the computer enough to be sure.
However, when printed, the narrow inside line looks
a little darker than intended, though that could
just be printer settings, etc. Thanks,
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )