[Kst] [Bug 224516] New: Adding curves through js is slow

Andrew Walker arwalker at sumusltd.com
Wed Jan 27 20:08:13 CET 2010


           Summary: Adding curves through js is slow
           Product: kst
           Version: 1.8.0
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: kst at kde.org
        ReportedBy: arwalker at sumusltd.com

Version:           1.8.0 (using KDE 4.3.4)
OS:                Linux
Installed from:    Compiled From Sources

Bug report follows from kst user:


I'm running Kst 1.8.0 on Fedora 10.

I sometimes deal with data files with 200+ fields and 70,000+ samples
per field. I setup all of the plots through KstScript and everything
goes pretty quickly until I start appending curves to the plot's
CurveCollection. The first few curves get added quickly, but adding
each additional curve takes exponentially longer -- like 30 minutes
for a data file with 300 fields. Most of the curves get added to one

Looking at the code in kst2dplot.cpp, it appears that the whole plot
and all of its curves get completely repainted every time a new curve
is added. If this is the case, one solution would be to make it
possible to add an array of curves to a plot at once. That way, all of
the painting and range calculations only need to be done once.

A more hacky workaround would be to add a KstScript function to
suspend and resume painting. Painting could be suspended before adding
curves and then resumed again afterwards.

Another alternative would be to schedule a repaint a second or two in
the future when a curve is added. The repaint would get rescheduled
every time a curve is added. So as long as you're adding curves
rapidly, the painting gets delayed.

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