Path: utzoo!mnetor!uunet!actnyc!rmf
From: rmf@actnyc.UUCP (Robert Fuhrer)
Newsgroups: comp.graphics
Subject: Re: thick lines, circles and ellipses
Message-ID: <670@actnyc.UUCP>
Date: 28 Jan 88 23:21:39 GMT
References: <694@prefix.liu.se> <16183@watmath.waterloo.edu> <696@portofix.liu.se> <471@ecrcvax.UUCP> <700@prefix.liu.se>
Reply-To: rmf@actnyc.UUCP (Robert Fuhrer)
Organization: InterACT Corporation
Lines: 18
Keywords: computer graphics, circles, ellipses, algorithms

This is my first posting, so I respectfully request no flames please if the
following does not represent the optimal (or even a working) solution:

Well, it seems to me that, especially in the case where the pen's "footprint" is
larger than 1x1, and is a pattern, e.g., a grey pattern of alternating white &
black pixels, you CAN do something:

Suppose, when drawing a line and incrementing in the vertical coordinate
(similar concept applies when incrementing the horizontal of course), that you
draw successive 1-pixel-high horizontal bands from your pattern.

When drawing conics, corners may require special treatment (such as plotting the
entire pen's footprint when changing from incrementing x to incrementing y?),
but I think the general approach works.

Comments, anyone? Am I on the right trail?

* No snappy sign-off *