[Octave-bug-tracker] [bug #44736] OpenGL / gl2ps printing alters or drops axis outline

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?44736>

                 Summary: OpenGL / gl2ps printing alters or drops axis outline
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Sun 05 Apr 2015 05:35:01 PM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  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:

For this demo using the command "patch":


graphics_toolkit qt
demo ("patch", 4)


the outline of the axis appears fine when displayed in OpenGL.  However, the
following gl2ps print:


print test.ps


(viewable in "gv test.ps") produces an image in which the right and top
outlines of the axes is very light grey, not black.

Converting that PostScript file to PDF via:


print test.pdf


(viewable in "acroread test.pdf" or "xpdf test.pdf") shows no right or top
outline at all, not even grey.

In the PostScript file are the following elements


1 1 1 RG
1 1 1 rg
5392.8 5806 m
5392.8 2285.2 l
f
5392.8 5806 m
928.801 5806 l
f


which, if removed, correct the black outline of the axes.

Where did these come from?  Are they supposed to be a white fill of the axis
line (which makes no sense)?  Both of these elements have zero width.  Could
it be that there is no fill, but the tessellation line issues described here:

https://savannah.gnu.org/bugs/?44181

is still drawing a grey line around what is a zero width fill?

Perhaps the ps2pdf routine is programmed to toss out elements of zero width
and so doesn't draw the the grey tessellation lines, as does "gv test.ps".




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