[Octave-bug-tracker] [bug #44781] Qt (but not FLTK) figure draws empty axes before doing the actual plot

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?44781>

                 Summary: Qt (but not FLTK) figure draws empty axes before
doing the actual plot
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Wed 08 Apr 2015 06:52:57 PM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

When a fresh figure is created via "plot", Qt graphics toolkit will first draw
an empty axes before doing the actual plot.  This creates a sort of flashing
effect sometimes.

Launch Octave GUI and create a slow plot with many points such as:


plot(1:1000000)


Notice how there are empty axes with extent (0:1) x (0:1) while the large draw
is waiting to complete.  This does not happen in FLTK graphics toolkit.

If the figure is first created, neither does the empty axes appear.  Try


figure
plot(1:1000000)


With "figure" there is a new window, but completely blank.  With the "plot"
the window remains blank until the (0:1000000) x (0:1000000) axes appear.





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