> I made a speed test with Python and found out that it's
> too slow for pixel ops. I change to C now.
> Furthermore the docs for a C plugin are much better than
> these for Python.
>
Hi Sam,
Thanks for your response.
Sven seems to know alot about it, he thinks python speed is good.
That would be because people are leveraging numpy and pixel_regions. You can blit to a pr in a flash, afaict. I have not done timing tests.
I recommend you look over this page:
http://www.scipy.org/Numpy_Example_List_With_Doc
...then see how people are blitting numpy arrays into pixel_regions.
AFAICT that is the deep secret. And find Travis Oliphants book on numpy; it"s 350 pages. He just freed it about two weeks ago.
Now, if I could ask for your help on my little problem, I just dont know how to treat only a rectangular selection in my plugin (and return a result as a new layer). That would be a big help. Check out the attachment when you have some time.
It is beginning to behave -- on my dataset, weather charts.
See you,
paul
Attachment:
stroke_to_vector.py
Description: Binary data
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