Can I draw off-screen

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Article #1715

#1715

From: John Purbrick
Date: Sun, 07 Sep 1986 02:45

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I'm doing some graphics-intensive stuff on my ST, using Megamax C. Some of it
involves animation, and it really looks bad to draw elements of the output
piece by piece. The time taken is significant, and it would be a great
improvement to draw the whole thing off-screen, in some phantom area, and
then reset the screen position. Then the new drawing would just "blink" into
place. But as far as I understand it, the drawing routines (v_pline, 
v_fillarea, etc) work only on the current screen. If anyone knows a way around
this problem I'd appreciate hearing it.
						-jp

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!ll-xn!mit-amt!mit-eddie!mit-hermes!jpexg
From: jpexg@mit-hermes.ARPA (John Purbrick)
Newsgroups: net.micro.atari16
Subject: Can I draw off-screen
Message-ID: <2700@mit-hermes.ARPA>
Date: Sat, 6-Sep-86 22:45:31 EDT
Article-I.D.: mit-herm.2700
Posted: Sat Sep  6 22:45:31 1986
Date-Received: Sun, 7-Sep-86 03:38:07 EDT
Distribution: net
Organization: The MIT AI Lab, Cambridge, MA
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