comp.lang.idl-pvwave archive: archive » optimization question: a faster way to PIXMAP?

Home » Public Forums » archive » optimization question: a faster way to PIXMAP?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

optimization question: a faster way to PIXMAP? [message #20579]

Thu, 13 July 2000 00:00

Dennis J. Boccippio is currently offline

Dennis J. Boccippio
Messages: 6
Registered: July 2000

Junior Member

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 _/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/_/

Report message to a moderator

[Message index]

		optimization question: a faster way to PIXMAP? By: Dennis J. Boccippio on Thu, 13 July 2000 00:00
		Re: optimization question: a faster way to PIXMAP? By: Struan Gray on Tue, 18 July 2000 00:00
		Re: optimization question: a faster way to PIXMAP? By: Dennis Boccippio on Mon, 17 July 2000 00:00
		Re: optimization question: a faster way to PIXMAP? By: wrb1000 on Mon, 17 July 2000 00:00
		Re: optimization question: a faster way to PIXMAP? By: Dennis J. Boccippio on Sat, 15 July 2000 00:00
		Re: optimization question: a faster way to PIXMAP? By: wrb1000 on Fri, 14 July 2000 00:00

Previous Topic:	Link IDL to ORACLE Pro*FORTRAN
Next Topic:	assignment inside boolean expression

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Nov 30 23:04:54 PST 2025

Total time taken to generate the page: 1.20455 seconds