[Octave-bug-tracker] [bug #55500] print modifies view of plot

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?55500>

                 Summary: print modifies view of plot
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 17 Jan 2019 09:44:55 AM PST
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

This was discovered in bug #55481 where differences between the plotting
engines of Octave and Matlab were compared.  In the cases below, the onscreen
result is correct, but when printed to a graphic png file the results are
different.

Other noticeable differences are in
- demo camlookat 1: different zoom levels (I can't reproduce on screen)
- demo camorbit 1: different view angle
- demo camtarget 1: different plotboxaspectratio
- demo camva 1: completely different zoom level between fltk and qt (I can't
reproduce on screen)
- demo camzoom 1: completely different zoom level between fltk and qt (I
cant't reproduce on screen) 

This may be related to updating the OpenGl transforms ahead of printing.  One
thing I notice is that if I use the mouse to rotate the plot the original view
is also lost.  Similarly, if I use the mouse to sligthly enlarge the plot
window then the plot snaps to a new view.

Simple example to reproduce


demo camva 1
## Use mouse to rotate plot







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