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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!rabbit!sdh
From: sdh@rabbit.UUCP (S. Hawley)
Newsgroups: net.micro.apple
Subject: XOR lines
Message-ID: <2626@rabbit.UUCP>
Date: Fri, 23-Mar-84 15:24:09 EST
Article-I.D.: rabbit.2626
Posted: Fri Mar 23 15:24:09 1984
Date-Received: Sun, 25-Mar-84 09:02:50 EST
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 14

With a little experimenting, I've modified the line drawing routine
used by Applesoft. Believe it or not, it is VERY relocatable, so I
moved it to RAM and modified both the line draw and the plot routines
to be exclusive-or instead of destroying background. This allows you
to produce programs that use the 'rubber banding' effect that has become
so popular in user-friendly software as of late.

If there is call for it I will gladly post the modifications and instructions
unfortunately, one must poke in the arguments and do a call, but with a
little work, I may have so that it uses either the ampersand or the usr
commands (probably ampersand).

Steve Hawley
<allegra,alice>!rabbit!sdh