[Octave-bug-tracker] [bug #44567] Qt graphics toolkit displays twice when opening a new figure via plot or image.

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?44567>

                 Summary: Qt graphics toolkit displays twice when opening a
new figure via plot or image.
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Wed 18 Mar 2015 07:06:28 AM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

When an integrated Qt plot() or image() is done, the display occurs twice when
the figure window is created initiated by the command.  This does not happen
in gnuplot or FLTK graphics toolkits.

Try the following after just starting Octave or making sure that all plot
windows are closed:


image(32*rand(5000,1000))


and watch for the repeated display of the image--once as a smaller image then
followed by the image at the correct size.

Try again with the plot window still open:


image(32*rand(5000,1000))


and the image only is displayed once.

Close all windows or exit and re-enter Octave.  Now try (individual commands
with wait a between or copied simultaneous):


figure()
image(32*rand(5000,1000))


and the image only is drawn once.





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