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[spr5962] drawing maps in CLIM Class: bh Bh-Id: spr5962 Bh: append spr5962 customer Date: Fri, 26 Jun 92 12:07:40 -0700 From: John Irwin <jdi@franz.com>
> Hi,
> I would like to be able to draw a world map using the Small World
> Database (SWDB). I can do this in CLIM but the loading time and
> displaying times are just about unusable. The unfiltered database
> consists of 8000 points. I have filtered the data down quite a bit,
> but loading and drawing is still too slow. This doesn't even count
> the need to zoom in and scroll through the map. So, what would be the
> best way to do this? Is there some way to create an image object some
> how that can be quickly translated or scaled as needed by the user?
Hi Chuck,
We aren't familiar with the SWDB. If you could provide a test case
that shows the slowness, preferrably via public ftp, then we could run
it here and give you some feedback on why it's so slow.
-- John Irwin
Franz Inc.
John,
Instead of doing this, could someone send me some details on how to
use bitmaps in CLIM? The reason things are slow is because I am
manually translating and scaling the data points to fit the size of
the window I want. It would be better to throw it up as a bitmap but
I'm not sure how to do it.
Another option is to use the built in regions and areas of CLIM. I
could probably define the transformations I need and let the system do
the work. If there are any examples of defining and using
transformations in CLIM I would very much appreciate getting them.
Thanks in advance,
Chuck
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| Charles P. Lombardo | lombardo@cs.nps.navy.mil |
| Computer Science Department | voice: 408-646-2102 |
| Naval Postgraduate School | fax: 408-646-2814 |
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