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From: sundar@ai.mit.edu (Sundar Narasimhan)
Newsgroups: comp.windows.x
Subject: Re: porting unstructured graphics code to X
Message-ID: <13601@life.ai.mit.edu>
Date: 27 Feb 91 23:02:12 GMT
References: <1991Feb25.212501.1776@yogi.fhhosp.ab.ca> <1991Feb26.092358@wsl.dec.com> <1991Feb27.073653@mccall.com>
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Reply-To: sundar@ai.mit.edu
Organization: MIT Artificial Intelligence Laboratory
Lines: 28

In article <1991Feb27.073653@mccall.com>, tp@mccall.com (Terry Poot) writes:
|> In article <1991Feb26.092358@wsl.dec.com>, klee@wsl.dec.com (Ken Lee) writes:
|> >In article <1991Feb25.212501.1776@yogi.fhhosp.ab.ca>,
|> >henry@yogi.fhhosp.ab.ca writes:
|> >|> Is there any easy way to port the code so that I can just draw into
|> >|> a window, and *not* have to worry about redrawing from Expose
|> >events?
|> >
|> >Try using the X Toolkit, with the graphics encapsulated in a widget.
|> >The X Toolkit will manage your expose events for you.
|> 
|> Of course, you'd still have to write that widget. 
Hmm.. You may want to look at the Display widget found in
trix.ai.mit.edu:/com/ftp/pub/users/sundar/graph.tar.Z. It attempts
to manage Expose events for the programmer and the package has
a simple graph widget built on top of it. The display widget uses 
a list of graphic objects to redraw on each Expose event.

-Sundar

ps. Standard disclaimers.

pps. I do have another set of library functions that manages Expose 
events directly using raw Xlib calls. The idea is to create a pixmap,
and draw on the pixmap as well as on the window during each drawing
operation. On an expose event one simply copies the pixmap to the
window. We use this library for the graphics course here at MIT and 
are quite happy with it.