[Octave-bug-tracker] [bug #47974] Visual differences between gnuplot and OpenGL toolkits

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?47974>

                 Summary: Visual differences between gnuplot and OpenGL
toolkits
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Sat 21 May 2016 10:31:31 PM PDT
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I ran many of the graphics demos with the qt and gnuplot toolkits.  I recorded
the differences I found below.  The tests were done with gnuplot 5.0.1 and the
development tip 21761:ff2b9f7069c5.  The format is "FUNCTION : DEMO # :
PROBLEM"

ezmeshc : #1 : mesh is completely white
polar : #1 : a rectangular box is drawn around the entire plot
ezsurf : #3 : position of titles is within the plot, rather than above it.
ezsurfc : #1 : shading is different.  It is faceted for OpenGl, and possibly
'flat' for gnuplot.
isosurface : #1 : squashed perspective (not axis equal).  plot box is still
on
meshc : #1 : mesh is compltely white
patch : #7 : 'interp' shading is not working
plotyy : #1 : causes hard failure.
Gdk:ERROR:/build/gtk+2.0-gl_hAC/gtk+2.0-2.24.28/gdk/gdkregion-generic.c:337:miSetExtents:
assertion failed: (pExtents->y1 < pExtents->y2)
annotation : #1 : hangs Octave

It seems several are related to the box command which does not remove all axis
lines in gnuplot as it does with OpenGL.






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