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From: sansom@trwrb.UUCP (Richard Sansom)
Newsgroups: net.micro.mac,net.micro.atari16
Subject: Re: Flopping line in MacPaint
Message-ID: <1241@trwrb.UUCP>
Date: Thu, 14-Aug-86 16:23:19 EDT
Article-I.D.: trwrb.1241
Posted: Thu Aug 14 16:23:19 1986
Date-Received: Sun, 17-Aug-86 05:25:54 EDT
References: <2693@mit-hermes.ARPA> <1232@trwrb.UUCP> <1050@k.cs.cmu.edu>
Reply-To: sansom@trwrb.UUCP (Richard Sansom)
Distribution: net
Organization: TRW EDS, Redondo Beach, CA
Lines: 31
Xref: mnetor net.micro.mac:6624 net.micro.atari16:1610

In article <1050@k.cs.cmu.edu> wrs@k.cs.cmu.edu (Walter Smith) writes:
>In article <1232@trwrb.UUCP>, sansom@trwrb.UUCP (Richard Sansom) writes:
>> 
>> In article <2693@mit-hermes.ARPA> jpexg@mit-hermes.ARPA (John Purbrick) writes:
>> >One thing that the Mac does when running MacPaint is let you start a line
>> >by clicking on a point, then flopping the other end around with the mouse
>> >...
>> 
>> The technique used is called XOR (eXclusive-OR).
>> ...
>
>Most programs do use XOR.  MacDraw, for instance, leaves things in OR mode
>until you start to manipulate an object, then redraws that object in XOR to
>allow rubber-band feedback.
>
>However, if you look closely at a line being drawn in MacPaint, you will see
>that XOR mode is NOT being used...
>
>- Walt

Oops, I guess I spoke too soon.  I was thinking about some of the programs
I had used in the past, and not specifically about MacPaint.  Sorry if I upset
anyone out there.

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