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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

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[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

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