bugGNU Octave - Bugs: bug #54848, [OpenGL Qt] zooming out or in...


bug #54848: [OpenGL Qt] zooming out or in leads to unexpected results

Submitted by:  Philip Nienhuis <philipnienhuis>
Submitted on:  Tue 16 Oct 2018 05:25:55 PM UTC  
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Unexpected Error or Warning
Status:  Fixed Assigned to:  None
Originator Name:  Philip Nienhuis Open/Closed:  Closed
Release:  dev Operating System:  Microsoft Windows

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Sat 02 Feb 2019 06:24:26 AM UTC, comment #3: 

Fixed on the development branch in this cset: https://hg.savannah.gnu.org/hgweb/octave/rev/a7dfb00d5bf5.

This will be a part of the Octave 6.1 release.  To access the fix sooner download axis.m from the Mercurial development branch and replace your local copy.

Closing report.

Rik <rik5>
Project Administrator
Tue 23 Oct 2018 06:02:19 PM UTC, comment #2: 

In bug #53724 a user has confirmed my findings.

Now the question beomes: is this a duplicate or a more general issue?

Philip Nienhuis <philipnienhuis>
Project Member
Tue 16 Oct 2018 08:25:38 PM UTC, comment #1: 

Fltk toolkit behaves better; while continuing zooming out the plot disappears but reappears when zooming back in.

Also, Octave-4.4.1 behaves better.

Philip Nienhuis <philipnienhuis>
Project Member
Tue 16 Oct 2018 05:25:55 PM UTC, original submission:  

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.


6. Repeat step 2

7. Type "axis equal" in command window

8. Repeat steps 3 - 5

==> 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.

Philip Nienhuis <philipnienhuis>
Project Member


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #45211:  bugXXXX.mat added by philipnienhuis (12KiB - application/octet-stream)


Depends on the following items: None found

Items that depend on this one: None found


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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-02-02 rik5 StatusNone => Fixed
        Open/ClosedOpen => Closed
    2018-10-16 philipnienhuis Summary[OpenGL] zooming out or in leads to unexpected results => [OpenGL Qt] zooming out or in leads to unexpected results
    2018-10-16 philipnienhuis Attached File- => Added bugXXXX.mat, #45211

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