[Kst] [Bug 98515] New: Skip mode fencepost errors

[netterfield at astro.utoronto.ca]

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http://bugs.kde.org/show_bug.cgi?id=98515         
           Summary: Skip mode fencepost errors
           Product: kst
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kst kde org
        ReportedBy: netterfield astro utoronto ca


Version:           1.1.0_devel (using KDE 3.3.0, SuSE)
Compiler:          gcc version 3.3.4 (pre 3.3.5 20040809)
OS:                Linux (i686) release 2.6.8-24.11-default

skip is borked.
Demo:
make a plot of a dirfile_maker file
2 curves both with points but no lines for clarity
  10 frames of sine, no skip
  10 frames of sine, with skip set. (need a second INDEX vector for X)
We will change starting frame and the skip value for curve 2

Case 1: starting frame = 0 and skip = 1 for both vectors of curve 2
        everything seems fine: curve 2 has the 1st sample of each frame

Case 2: starting frame = 10 (anything !=0), curve 2 skip = 1
        The X (INDEX) vector seems to have the correct value,
        but the Y (sine) vector seems to be shifted by by ~19 samples


Case 3: starting frame = 10 (anything !=0), curve 2 skip = 2
        X and Y vectors are both shifted, so the points are correct,
        but start 1 frame early, and end 1 frame early