[Octave-bug-tracker] [bug #34282] Holes in filled countours don't get the background colour

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?34282>

                 Summary: Holes in filled countours don't get the background
colour
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 13 Sep 2011 11:27:04 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Anders Höglund
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.2
        Operating System: GNU/Linux

    _______________________________________________________

Details:

The below code should produce a (green) filled disc with a hole in the centre.
 On version 3.4.2 the whole in the centre is a third colour (dark red) instead
of the background colour (white).


x = linspace(-2,2);
[X,Y] = meshgrid(x);
contourf(x,x,sqrt(X.^2+Y.^2)./(X.^2+Y.^2+1) ,[0.4,0.4] )


The following patch to __contour__.m appears to fix the problem for me.


--- /usr/share/octave/3.4.2/m/plot/private/__contour__.m        2011-08-12
15:46:16.000000000 +0200
+++ __contour__.m       2011-09-13 12:09:37.372008000 +0200
@@ -319,10 +319,15 @@
       else
         ## Special case unclosed contours
       endif
+      if (isnan(cont_lev(idx)))
+        fc = [1, 1, 1];
+      else
+        fc = "flat";
+      endif
       h = [h; __go_patch__(ca, "xdata", ctmp(1, :)(:), "ydata", ctmp(2,
:)(:),
                            "vertices", ctmp.', "faces", 1:(cont_len(idx)-1),
                            "facevertexcdata", cont_lev(idx),
-                           "facecolor", "flat", "cdata", cont_lev(idx),
+                           "facecolor", fc, "cdata", cont_lev(idx),
                            "edgecolor", lc, "linestyle", ls,
                            "linewidth", lw, "parent", hg)];
     endfor





    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?34282>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/