[Octave-bug-tracker] [bug #54848] [OpenGL] zooming out or in leads to unexpected results

[Philip Nienhuis]

URL:
  <https://savannah.gnu.org/bugs/?54848>

                 Summary: [OpenGL] zooming out or in leads to unexpected
results
                 Project: GNU Octave
            Submitted by: philipnienhuis
            Submitted on: Tue 16 Oct 2018 07:25:55 PM CEST
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: Philip Nienhuis
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Microsoft Windows

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Details:

Steps to reproduce:
1. load the attached .mat file bugXXXX.mat

2. plot the data using:

patch ("vertices", [X Y], "faces", faces, "facecolor", [0.5 0.7 0.9],
"edgecolor", [0.6 0.6 0.6])

3. click  Zoom in" button

4. Zoom out using scroll wheel until plotted data disappear completely (axes
still visible).

5. Then zoom back in

==> Result:
No problems.

But,

6. Repeat step 2

7. Type "axis equal" in command window

8. Repeat steps 3 - 5

Result:
==> After a few zoom-out steps (9 in my case) the plot and axes suddenly
disappear completely. Zooming back in they don't reappear.

In addition, after step 2 (w/o "axis equal"), zooming out (with zoom out
button active) by clicking in the plot, the plot zooms out but after a few
clicks in the plot often zooms back in to full extent.

In other tries, zooming in behaves similarly, the plot zooms out unexpectedly
in some cases.




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File Attachments:


-------------------------------------------------------
Date: Tue 16 Oct 2018 07:25:55 PM CEST  Name: bugXXXX.mat  Size: 12KiB   By:
philipnienhuis

<http://savannah.gnu.org/bugs/download.php?file_id=45211>

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