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

[Marcus D. Hanwell]

Hi Eric,

Sorry - I didn't get chance to look into this, but I was surprised it would
cause issues. If you have any patches you would like me to merge/look at
please let me know.

Thanks,

Marcus

On Tue, Apr 27, 2010 at 2:29 PM, Eric E. Monson <emonson at cs.duke.edu> wrote:

> 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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