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From: bhyde@inmet.UUCP
Newsgroups: net.micro.mac
Subject: Re: Flopping line in MacPaint (rubb
Message-ID: <26700066@inmet>
Date: Sun, 17-Aug-86 20:29:00 EDT
Article-I.D.: inmet.26700066
Posted: Sun Aug 17 20:29:00 1986
Date-Received: Tue, 19-Aug-86 04:46:41 EDT
References: <208@bridge2.UUCP>
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Nf-ID: #R:bridge2.UUCP:-20800:inmet:26700066:000:352
Nf-From: inmet.UUCP!bhyde    Aug 17 20:29:00 1986


In MacPaint the tricks for managing to move an object around are much more
sophisticated than XOR.  An entire copy of the bit image being over
drawn is maintained.  During each cycle the saved copy is restored and then
the tool's dynamic portion is smashed into that.  Of course this requires
that it be real quick and/or use the alternate video area.