[Octave-bug-tracker] [bug #62660] Cannot see a plot on qt graphics on 7.1.0 windows

[Giuseppe Baffi]

Follow-up Comment #29, bug #62660 (project octave):

hello everybody, 

I hope this can help, 

I found a simple workaround. 

This morning I tried last release, octave-8.1.0. I used the 7z archive. 
Still it was not working with qt graphic toolkit, after calling a plot it was
opening a blank window and nothing else. 
After searching the net I discovered that the opengl32 and qt issue is quite
common with the Intel HD 3000 card. 
One suggestion was to set a new environmental variable QT_OPENGL to "desktop".


I tried opening a cmd shell, passing the command 

  set QT_OPENGL=desktop 

and then calling from the cmd shell "octave-launch.exe"

And it worked using the qt graphic toolkit (I tried directly the sombrero
function). 

So I made a octave.bat file (outside the folder) with the following lines 

  set QT_OPENGL=desktop 
  octave-8.1.0-w64\octave-launch.exe 

and it worked by double clicking the bat file (but leaving the cmd shell
open). 


I tried also to set the environmental variable in windows 10 as above, reboot,
and it worked by double clicking on octave-launch.exe 

Next I removed the environmental variable installed octave with system opengl,
rebooted and it did not work. 

Next I recreated the environmental variable, rebooted and it did work (now
using the "GNU Octave (Local) (GUI)" icon created by the installer). 


I am just wondering if there is any way of allowing the users to select
"QT_OPENGL=desktop" option without setting the environmental variables in
windows 10. 


Regards 

pino 





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