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From: jlp@cbnewsh.att.com (jon.peticolas)
Newsgroups: comp.lang.postscript
Subject: Re: Stroking thick lines about arcs
Message-ID: <1991Feb21.225435.15664@cbnewsh.att.com>
Date: 21 Feb 91 22:54:35 GMT
References: <1991Feb20.161757.24206@motcad.portal.com>
Organization: AT&T Bell Laboratories
Lines: 31

From article <1991Feb20.161757.24206@motcad.portal.com>, by jtc@motcad.portal.com (J.T. Conklin):
> I have been observing that stroking an arc with a ``thick'' line results
> in some areas of white peeking through the line --- especially about the
> outside perimeter --- on two independant PostScript implementation.

   (stuff deleted)

> 	/inch { 72 mul } def
> 	/radius 3.5 inch def
> 	/points 27 def
 
> 	4.25 inch 5.5 inch translate
> 	points 1.5 mul setlinewidth
 
> 	newpath
> 	0 0 radius points 3 div add 0 360 arc

	closepath % Works for me

> 	stroke
 
> 	showpage


The closepath operator tells postscript that the ends of the path are
to be joined with a mitered connection. If they are not actually the
same point, the path will be completed with a straight line. This detail
is covered in chapter 3 of the Adobe blue book (in my admittedly outdated 
copy anyway).  Additional line joining details are covered in chapter 10.

-Jon