[Octave-bug-tracker] [bug #52878] Tiny plots in Qt/FLTK plotting window on UHD / hidpi display

[Michael Weitzel]

Follow-up Comment #4, bug #52878 (project octave):

I see, there was a misunderstanding. You're right - my screenshot LOOKS like
'subplot(2,2,3)' - however, I didn't use subplot!

The Qt figure window is scaled by factor 2 because of the environment variable
setting (QT_SCREEN_SCALE_FACTORS). The code generating the figure (i.e. the
actual bitmap image) ignores the desktop scaling factor as well as the
X-server's DPI-setting.

I tried a few combinations: in octave-cli none of the allowed graphics_toolkit
settings ("fltk", "gnuplot") results in a scaled figure. In octave-gui
graphics_toolkit "qt" results in the subplot-like figure (as shown by my
screenshot). "fltk" gives a small window and a small figure. Finally,
"graphics_toolkit gnuplot" works fine: I get a scaled windows AND a scaled
figure (without using any set(...)-commands). The lines are a bit thin, but
that's ok.

Thank you very much for pointing me to gnuplot. I'm happy with the combination
octave-gui + gnuplot.


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