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From: songer@orchestra.ecn.purdue.edu (Christopher M Songer)
Newsgroups: comp.sys.next
Subject: Caching Images for Views ....
Message-ID: <1991May15.161837.27550@noose.ecn.purdue.edu>
Date: 15 May 91 16:18:37 GMT
Sender: root@noose.ecn.purdue.edu (ECN System Management)
Distribution: usa
Organization: Purdue University Engineering Computer Network
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Hi,

     I'm looking to put a Postscript image in a view smaller than the
total image -- ie, I would like to be able to scroll around in it. I
looked through the concepts manual and it seemed to indicate that the
best way to do fast updates is to draw to a bitmap and then copy the
bit map into the view (no suprise there.) The on-line manual describes
a "Bitmap" object. It does not seem to be present in 2.0.

     I looked through the Yap source code, to find the creation of the
cache it uses. Somehow, it seemed to be using a "Window" object as the cache.
The overall effect is that I am pretty in the dark as to how to first
get a bit map and then draw to it. If some kind soul has a simple piece
of sample code or can explain what is going on to me, I'd really apprecaite
it. I'm sure it is not hard, but my hard copy docs are still (still
still still still ...) on order and I am having a tough time pulling what
I need out of the on-line stuff. 

Thanks!
-Chris
songer@ecn.purdue.edu