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Re: optimization question: a faster way to PIXMAP?
| Re: optimization question: a faster way to PIXMAP? [message #20576] |
Fri, 14 July 2000 00:00 |
Randall Frank
Messages: 17
Registered: October 1999
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Junior Member |
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A suggestion: don't use graphics functions. You could use
POLYFILLV (see the example code in the online help) or the
IDLanROI::ComputeMask() function (IDL 5.3) to do this without
using graphics at all (note: I have not actually timed these
alternatives, so your milage may vary).
FWIW.
"Dennis J. Boccippio" wrote:
>
> A question for the IDL gurus:
>
> - I have data in the form of irregular polygons, each polygon has
> an associated value (let's call it an amplitude). I want a
> composite image of the sum of all these polygons' amplitudes.
>
> - My current approach is to :
>
> (1) create a (large) WINDOW,../PIXMAP,
> (2) render each polygon using POLYFILL
> (3) TVRD() the pixmap window
> (4) add this to an accumulation array
>
> ... iterate (1)-(4) until all polygons have been rendered
>
> This works, but is painfully slow. Profiling the code shows that
> by far the most significant logjam is the TVRD() of the pixmap.
>
> So: does anyone know of more efficient ways to do this? Is the Z
> device an option - it seems like it can be used for internal frame
> storage, but would still have to be probed by TVRD()...?
>
> Thanks,
>
> Dennis
>
> --
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/_/
> _/ Dennis J. Boccippio _/
> _/ http://fly.hiwaay.net/~djboccip/Dennis.html _/
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/_/
--
rjf.
Randy Frank | ASCI Visualization
Lawrence Livermore National Laboratory | rjfrank@llnl.gov
B451 Room 2039 L-561 | Voice: (925) 423-9399
Livermore, CA 94550 | Fax: (925) 423-8704
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