Path: utzoo!mnetor!uunet!mcvax!ukc!dcl-cs!bath63!pes
From: pes@ux63.bath.ac.uk (Smee)
Newsgroups: comp.sys.atari.st
Subject: Re: fast scrolling
Message-ID: <2468@bath63.ux63.bath.ac.uk>
Date: 25 Apr 88 09:30:43 GMT
References: <8804202024.AA18481@cory.Berkeley.EDU>
Reply-To: pes@ux63.bath.ac.uk (Smee)
Organization: AUCC c/o University of Bath
Lines: 12


Matt's is a special case of the general principle, don't work in smaller
chunks than you have to.  For example, if you are moving a sprite around
the screen at high speed, don't move it a pixel at a time.  Rather, work
out how far it will go in one complete screen frame (1/70 sec mono, 1/50
or 1/60 second in colour) and then move it that many pixels in one jump,
synchronized with the VSYNC.  You can get a lot of speedup that way in
many cases.

Of course, you have to work out whether you are talking to a mono or colour
monitor, and if colour, at what frequency, but you can get the OS to tell
you all that.