[Octave-bug-tracker] [bug #31174] octave3.2: axis equal/square incorrect for gnuplot 4.4

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?31174>

                 Summary: octave3.2: axis equal/square incorrect for gnuplot
4.4
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 30 Sep 2010 05:34:12 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Yann Vernier
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

There is a bug in handling of 2d plots with Octave 3.2 and Gnuplot 4.4.

I found that while axis equal or axis square change the plot, both
on screen and in print, it does not calculate the ratios correctly.
Whatever it is setting seems dependent on the window shape, which really
should never affect the printout.

Forcing __gnuplot_has_feature__("screen_coordinates_for_{lrtb}margin")
to 0 fixes this problem. That variable appears to be intended to handle
some change in gnuplot 4.3, which I am not aware of.
Within __go_draw_axes__ that variable affects not only margin
calculation but disables setting of gnuplot parameters origin and size.
The variable also affects the axis command itself, as dataaspectratio
seems to change format.

"axis equal" and "axis square" should be equivalent to gnuplot "set size
ratio -1" and "set size ratio 1" respectively.

Additionally, there seems to be a developer note about this in
__go_draw_axes__:
      ## FIXME -- nothing should change for gnuplot 4.2.x.
Whoever wrote that probably has a better idea than I what's going on.

Debian bug #598059.



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