Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ucselx!ucsd!usc!apple!keith
From: keith@Apple.COM (Keith Rollin)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Dragging Bitmaps?
Message-ID: <42700@apple.Apple.COM>
Date: 6 Jul 90 16:58:37 GMT
References: <3398@husc6.harvard.edu> <1741@mountn.dec.com> <13874@unix.SRI.COM>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 36

In article <13874@unix.SRI.COM> mxmora@unix.UUCP (Matt Mora) writes:
>In article <1741@mountn.dec.com> minow@bolt.enet.dec.com (Martin Minow) writes:
>>In article <3398@husc6.harvard.edu> siegel@endor.harvard.edu (Rich Siegel)
>>writes:
>>>
>>>Does anyone have any suggestions on how to drag small bitmaps around, in the
>>>same fashion as MacPaint?
>>
>>Look through MacTutor back issues for an article on "animated bitmaps" --
>
>Also look at Apples sample code on offscreen bitmaps. The code lets you
>drag small bitmaps around and looks real smooth. I had a tough time trying
>to get it to work in THINK pascal but should be no problem for you. It also
>comes in C.
>
>The program also lets you toggle the offscreen bitmaps on and off to see
>the differnce with using multiple bitmaps.
>
>I think the code was based on their new Gworld stuff. I can't remember its
>been a while since I played with it.

Thanks for the plug, Matt. However, those routines do NOT rely (or even
use) the new GWorld routines in 32-bit Color QuickDraw, so they'll work
on any Macintosh. Also, they were written way before 32bcqd was
available. A couple of people here have taken a look at what it would
take to backfit the GWorld routines onto our OffScreen unit, but
initial estimates indicate that it would take a bit of work, and none
of our graphics support people have had the time to undertake the task
yet. We'll get to it someday, though...

-- 
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Keith Rollin  ---  Apple Computer, Inc.  ---  Developer Technical Support
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"Argue for your Apple, and sure enough, it's yours" - Keith Rollin, Contusions