[vtk-developers] PCoords rectangles slow in Python w/lots of axes

[Eric E. Monson]

Hey Marcus,

I don't know if there was just something weird going on that day, or if something has changed, but I'm not having trouble with this any more. (I'm playing now with a slightly modified version of the PC chart and plot, but I don't think the small changes I made impacted the performance.)

Sorry for the noise,
-Eric


On Apr 22, 2010, at 5:13 PM, Eric E. Monson wrote:

> Hey Marcus,
> 
> Not something urgent, but just a note so you know: When making selections in a parallel coordinates chart that has a lot of axes (say 16 or 24) in Python, the drawing of the red selection rectangle is fairly slow. It's still useable, but it's quite noticeably slower than when I have a lot of axes in ParaView (which is quite snappy). The leading edge of the rectangle lags behind the cursor, and then eventually catches up.
> 
> I'm not sure why this would be -- something about the drawing operation or some checks it has to do after each mouse move... I only mention it because if you know about it maybe something will jump out at you in the code that could be done differently.
> 
> I know I still haven't gotten around to filing those other feature requests... I can add this if you want, too, and attach an example script.
> 
> Talk to you later,
> -Eric
> 
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