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From: earleh@eleazar.dartmouth.edu (Earle R. Horton)
Newsgroups: comp.sys.mac.programmer
Subject: Re: CopyBits and the Mac II
Message-ID: <10006@dartvax.Dartmouth.EDU>
Date: 3 Sep 88 18:17:18 GMT
References: <51404DN5@PSUVM>
Sender: news@dartvax.Dartmouth.EDU
Reply-To: earleh@eleazar.dartmouth.edu (Earle R. Horton)
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Lines: 21

In article <51404DN5@PSUVM> DN5@PSUVM.BITNET (D. Jay Newman) writes:
>Hi out there:
>
>I am programming a simple animation on the Mac (a simple polygon rotating
>around the center), and to make it smoother I used an off-screen bitmap,
>and I used CopyBits to get it onto the screen (like TechNote 41).
>
>This works correctly with a Mac Plus, but the Mac II includes a lot of
>garbage in the rectangle with the rotating polygon:  I can still see the

I am doing something very similar on the Mac II, a rotating three
dimensional whatchamacallit.  On the II, I use color windows and
PixMaps, rather than BitMaps, for the offscreen storage.  This is
explained in TechNote 120, along with example MPW Pascal source.  You
might want to consider doing this if your program is to work on both
color and non-color machines and you have some access to a II during
your development.  It took me about a day to work up the necessary
routines, including testing for machine type, using the correct type
of Map for the present machine, and so forth.
Earle R. Horton. 23 Fletcher Circle, Hanover, NH 03755
(603) 643-4109