Path: utzoo!yunexus!geac!sq!murray
From: murray@sq.sq.com (Murray Maloney)
Newsgroups: comp.text
Subject: Re: Shaded Boxes in PIC
Message-ID: <1989Nov16.212742.7067@sq.sq.com>
Date: 16 Nov 89 21:27:42 GMT
Article-I.D.: sq.1989Nov16.212742.7067
References: <546@dcdwest.UUCP> <127725@sun.Eng.Sun.COM> <309@opel.uu.net>
Reply-To: murray@sq.com (Murray Maloney)
Organization: SoftQuad Inc., Toronto
Lines: 29

In article <309@opel.uu.net> johnk@opel.UUCP (John Kennedy) writes:
>The facts as I understand them:
>1)  Pic generates input to troff, according to troff's input language.
>2)  Troff generates a device-independent output.
>3)  Various filters take the troff output and generate device-specific codes.
>Therefore,
>    It is possible for pic drawings to appear on a PostScript printer.
>However,
>    Features of PostScript, such as shading are not in the repertoire
>    of what troff handles, and thus, no output of pic can instruct
>    troff to generate the appropriate output.
>-- 
>John Kennedy                     johnk@opel.uu.uunet
>Second Source, Inc.
>Annapolis, MD

Features such as pattern-filling of closed objects (boxes, circles, ellipses)
and grey-scaling are in the repertoire of sqtroff.  So, there is a way
for pic (or sqpic) to generate the appropriate output.  Fill patterns
are enabled and selected with \D'f N' -- where `N' represents a standard
pattern on the imaging device (0=no pattern, 1=solid, ...).  The level of 
grey scale is specified with \D'w N' -- where `N' ranges from 0 (black) 
to 1 (white).  Using these in combination boxes can be shaded most any way
that you would like.

********************************************************************************
Murray C. Maloney		uucp:		{utai|utzoo|uunet}!sq!murray
Documentation Specialist	Internet:	murray@sq.com
SoftQuad Inc.			Phone:		(416) 963-8337