[Octave-bug-tracker] [bug #58956] Empty plot for certain xlim / ylim settings

[Hg200]

URL:
  <https://savannah.gnu.org/bugs/?58956>

                 Summary: Empty plot for certain xlim / ylim settings
                 Project: GNU Octave
            Submitted by: hg200
            Submitted on: Fri 14 Aug 2020 06:12:22 PM UTC
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: hg200
        Originator Email: 
             Open/Closed: Open
                 Release: other
         Discussion Lock: Any
        Operating System: Any

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Details:

The following code creates an empty plot. I.e. the axes and additional graphic
objects are not displayed. Affects Linux development branch, Windows MXE
Octave 5.2.0 and an intermediate version of the stable MXE Octave branch.

In Matlab 2018, the "dot" and the axis are visible:

++
plot (0, 0, "ro");
daspect ([1, 1, 1]);
ylim ([-1e5, 3e5]);
xlim ([-1e5, 1e5]);
--

We can "heal" the plot by doing the following adjustment:

++
plot (0, 0, "ro");
daspect ([1, 1, 1e6]);
ylim ([-1e5, 3e5]);
xlim ([-1e5, 1e5]);
--

Sometimes but not always this also "heals" the plot:

++
plot (0, 0, "ro");
daspect ([1, 1, 1]);
ylim ([-1e5, 1e5]);
xlim ([-1e5, 1e5]);
--

And in this variant, the plot is empty too:

++
hold on;
axis equal;
ylim ([-1e5, 3e5]);
xlim ([-1e5, 1e5]);
plot (0, 0, "ro");
--

I don't get any gl-renderer warnings.

Please: Can anybody can reproduce?





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