[Octave-bug-tracker] [bug #47217] After image/imagesc, the body of a patch is not drawn under FLTK

[Lachlan Andrew]

URL:
  <http://savannah.gnu.org/bugs/?47217>

                 Summary: After image/imagesc, the body of a patch is not
drawn under FLTK 
                 Project: GNU Octave
            Submitted by: lachlan
            Submitted on: Mon 22 Feb 2016 04:52:59 AM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: lachlan
         Originator Name: Lachlan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Typing


graphics_toolkit ("fltk")
imagesc (rand (3,3))
patch ([1 2 2 1], [ 1 1 2 2], 'b')


will produce the outline of a patch at the stated coordinates, but inside the
patch will still show the random pixels from imagesc.

The reason is that the patch body is deliberately pushed deeper in the
Z-buffer's (not the patch's) Z coordinate so that it doesn't overwrite the
patch edge.  However, it seems that this pushes it behind the imagesc data.  I
haven't found where that is set, so I can't confirm its Z-buffer location.

Reducing the offset seems to work.  I'll submit a changeset once I have the
bug number.




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