Path: utzoo!censor!geac!jtsv16!uunet!snorkelwacker!mit-eddie!mit-amt!dlleigh
From: dlleigh@mit-amt.MEDIA.MIT.EDU (Darren Leigh)
Newsgroups: comp.sys.amiga.tech
Subject: Fast/smooth/easy vertical scrolling
Message-ID: <993@mit-amt.MEDIA.MIT.EDU>
Date: 9 Nov 89 21:26:18 GMT
Reply-To: dlleigh@media-lab.media.mit.edu.UUCP (Darren Leigh)
Distribution: na
Organization: MIT Media Lab, Cambridge MA
Lines: 18

I'm looking for various ways to do fast and smooth vertical scrolling
of text.  Both up and down scrolling are necessary.  Prefereably the
scrolling should take as little CPU time as possible.  I also need to
have the sprites usable over the entire screen.

I recall some discussion here a while back about making each text line
be a different viewport and then reconstructing the view 60 times a
second (or so).  That would be great, but how well do the sprites work
across viewport boundaries?  I know the Intuition pointer goes blank
on the scan line between two different screens.

Any other schemes for scrolling (even if they are not quite what I'm
looking for) are welcomed.  Please mail replies.  I'll summarize to
the net.

Darren Leigh
dlleigh@media-lab.media.mit.edu
mit-amt!dlleigh