Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!uwm.edu!ux1.cso.uiuc.edu!sparc1!rolf
From: rolf@sparc1 (Rolf Wilson)
Newsgroups: comp.sys.mac.programmer
Subject: choosing animation sync methods
Message-ID: <1991Apr22.152757.23565@ux1.cso.uiuc.edu>
Date: 22 Apr 91 15:27:57 GMT
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
Lines: 19


  The original standard way to prevent flicker was to wait for
TickCount() to increment before drawing. Of course, this does
not work on machines with monitors whose refresh rate does not
match the rate that TickCount() increments. Some code was
given in the Usenet Mac Programmer's Guide for setting up a
VBL task to tell you when the vertical blanking interval had
begun.

  My question is : how can I decide in advance which method to use?
Certainly, for known machines I can just look at the machine id, what
what about new ones?

  It should be possible to do a simple animation that won't flicker
no matter what machine you use, should it not?

--

Rolf Wilson   Illinois State Geological Survey   rolf@sparc1.isgs.uiuc.edu