[Octave-bug-tracker] [bug #61532] "Automatic limits for current axis" button doesn't respect "axis tight"

[Philip Nienhuis]

URL:
  <https://savannah.gnu.org/bugs/?61532>

                 Summary: "Automatic limits for current axis" button doesn't
respect "axis tight"
                 Project: GNU Octave
            Submitted by: philipnienhuis
            Submitted on: Tue 23 Nov 2021 03:30:08 PM CET
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Philip Nienhuis
        Originator Email: 
             Open/Closed: Open
                 Release: 7.0.90
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

(Admittedly merely cosmetic, but for complicated plots and esp. maps (mapping
package) I find Octave's behavior quite annoying)

Steps to reproduce:

Type:
xm = 7; plot (-xm:xm, sin (-xm:xm))  
==> Plot shows up

Zoom in somewhere in the plot (isn't even required)

Click "Automatic limits for current axis" button

==> Plot again has "loose" limits.

Same for Octave-5.2.0, so this is an old issue.

Matlab (I tested with r2014a & r2020b) does this "right", or maybe better: "as
expected":
r2014a seems to have no "Automatic limits" button, but the "Zoom out" button,
clicked often enough, in the end produces the original plot with tight axis
limits.
r2020b's "Restore original view" does likewise.

Along the way, noted another incompatibility:
Octave allows zooming out much further than the original axis limits and
behaves quite unpredictably at that. Sometimes (when clicking the zoom out
button repeatedly) it suddenly zooms back in to original (loose) view,
sometimes it zooms out two or three times and only then suddenly zooms back in
to original (loose) view.
Matlab consistently zooms out until the original plot size is restored, tight
or loose.

I had a look in axis.m, I think the relevant code there looks quite involved.
Maybe easier fixed using hidden properties for original axis limits settings?
("original" meaning "before zooming in")





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