[Kst] [Bug 249555] New: Bogus front to back line on live plot

Peter Milne peter.milne at d-tacq.com
Mon Aug 30 23:31:31 CEST 2010


           Summary: Bogus front to back line on live plot
           Product: kst
           Version: 2.0.0
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: plotting
        AssignedTo: kst at kde.org
        ReportedBy: peter.milne at d-tacq.com

Created an attachment (id=51123)
 --> (http://bugs.kde.org/attachment.cgi?id=51123)
Picture shows the "diagonal line" fault

Version:           2.0.0
OS:                Linux

Running a live plot, last 100 points in a long trace with >1 update per second.
Approx 1 in 10 plots show a fault where it appears that a straight line is
drawn back from the right-most point to the left most point.
This appears as  "Diagonal Line" in noisy data. 
The rest of the plots are fine

Reproducible: Always

Steps to Reproduce:
Plot live data. Watch. Finger on the pause button to catch it ..

Looks like it's related to timebase.
Plotting data vs index, the fault doesn't happen.

The generator program updates data first, then timebase...
maybe we'd get better results if it were to write timebase before data?.

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