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From: mcinerny@rochester.ARPA (Michael McInerny)
Newsgroups: comp.sys.amiga
Subject: Re: Rapid Stimulus Displaying on the Amiga Help
Message-ID: <27416@rochester.ARPA>
Date: Thu, 30-Apr-87 09:56:59 EDT
Article-I.D.: rocheste.27416
Posted: Thu Apr 30 09:56:59 1987
Date-Received: Sat, 2-May-87 08:34:26 EDT
References: <912@watcgl.UUCP> <5645@eddie.MIT.EDU>
Reply-To: mcinerny@rochester.UUCP (Michael McInerny)
Followup-To: comp.sys.amiga
Distribution: comp
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 19
Keywords: Fast, Screen, Window, RastPort, etc displays
Summary: Use screens, not windows


[I'm sorry if someone's suggested this already...]

Why don't you use screens and not windows for your applications?
You should be able to do a Screen-To-Front/Back very quickly--it's
just chaning a few bits, rather than blitting planes.  Also, if you're
really crazy (:-) you could use a Dual Playfield--use one playfield for
your instructions, etc. (stuff you want to stick around), and cut a
"hole" in it, for presenting the stimuli.  Then, on the second plane, you
render the stimuli and shift the second plane (again easy--there's a
demo for all this) so that the appropriate stimulus is under the "hole".
If you're clever, you can divy up the space on the second plan for several
stimuli plus a blank.  Render 'em once and then move the plane.  The
demo is a Dual Playfield from C/A Los Gatos a long time ago, but I
could probably dredge it up if you _really_ wanted it.  You could even build
the screen without depth arrangers so that inquisitive subjects can't
rearrange your work.  

-Michael