[Octave-bug-tracker] [bug #54797] getframe fails with consecutive figures

[Juan Pablo Carbajal]

URL:
  <https://savannah.gnu.org/bugs/?54797>

                 Summary: getframe fails with consecutive figures
                 Project: GNU Octave
            Submitted by: juanpi
            Submitted on: Sat 06 Oct 2018 12:28:30 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: Confirmed
             Assigned to: None
         Originator Name: juanpi
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

The following code


n = 10000;
for i=1:4
    figure(i)
    plot (randn(n,1), randn(n,1), '.')
endfor

for i=1:4
    figure(i)
    set (gcf, 'units', 'normalized', 'position', [0 0 0.9 0.9]);
    drawnow
    imwrite (frame2im (getframe (gcf)), sprintf("/tmp/tstfig-%d.png", i));
endfor


gives


warning: called from
    getframe at line 102 column 11
warning: opengl_renderer: Error 'invalid value' (1281) occurred
drawing 'line' object


and the images are empty.

Pantxo found a workaround by modifying the figure resize command to


set (gcf, 'units', 'normalized', 'position', [0 0 0.9 0.9],
'units','pixels');






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