[Octave-bug-tracker] [bug #45028] Use "visible", "off" for printing

[John W. Eaton]

Follow-up Comment #1, bug #45028 (project octave):

Perhaps we can use something like this


hnew = -1;
unwind_protect
  tmp_fig = copyobj (fig);
  set (tmp_fig, 'visible', 'off');
  print (tmp_fig, ...);
unwind_protect_cleanup
  if (tmp_fig > 0)
    close (tmp_fig)
  endif
end_unwind_protect


Then the original figure would not flicker or be removed.

Unfortunately, as things currently work this briefly displays the copy of the
figure on the screen.  But we might be able to fix that by modifying the
copyobj function to accept a list of properties to apply after making the
copy.  Then it would be


tmp_fig = copyobj (fig, 'visible', 'off');


to create an invisible copy of an existing figure FIG.

Using unwind_protect should properly manage the object so it is deleted no
matter how control leaves the print function.

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