[Octave-bug-tracker] [bug #42580] contour shows interconnections

[Andreas Weber]

URL:
  <http://savannah.gnu.org/bugs/?42580>

                 Summary: contour shows interconnections 
                 Project: GNU Octave
            Submitted by: andy1978
            Submitted on: Wed 18 Jun 2014 04:30:10 PM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  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:

hg id 5eca3080c7cd


close all
graphics_toolkit fltk
n = 500;
t = linspace (-1,1,n);
[x,y] = meshgrid (t, t);
z = hypot (x, y);
[~, h] = contour (z, 5);


and move mouse over plot window or move the window to trigger the
fl_window:draw routine and thus opengl_renderer::draw_patch. I guess the error
happens here but I haven't enough time yet to debug it further. This also
happens with graphics_toolkit qt when you move the window (moving the cursor
over the figure doesn't call the redraw routine in qt)

You will see additional secants drawn in the color of the current patch.
(attached some screenshots)




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File Attachments:


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Date: Wed 18 Jun 2014 04:30:10 PM GMT  Name: sec1.png  Size: 17kB   By:
andy1978

<http://savannah.gnu.org/bugs/download.php?file_id=31576>
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Date: Wed 18 Jun 2014 04:30:10 PM GMT  Name: sec3.png  Size: 16kB   By:
andy1978

<http://savannah.gnu.org/bugs/download.php?file_id=31577>
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Date: Wed 18 Jun 2014 04:30:10 PM GMT  Name: sec5.png  Size: 16kB   By:
andy1978

<http://savannah.gnu.org/bugs/download.php?file_id=31578>
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Date: Wed 18 Jun 2014 04:30:10 PM GMT  Name: sec6.png  Size: 16kB   By:
andy1978

<http://savannah.gnu.org/bugs/download.php?file_id=31579>

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