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diff --git a/octave_packages/m/plot/private/__next_line_color__.m b/octave_packages/m/plot/private/__next_line_color__.m
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+## Copyright (C) 2007-2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{rgb} =} __next_line_color__ (@var{reset})
+## Undocumented internal function.
+## @end deftypefn
+
+## Return the next line color in the rotation.
+
+## Author: jwe
+
+function rgb = __next_line_color__ (reset)
+
+  persistent color_rotation;
+  persistent num_colors;
+  persistent color_index;
+
+  if (nargin < 2)
+    if (nargin == 1)
+      if (reset || isempty (color_rotation))
+        color_rotation = get (gca (), "colororder");
+        num_colors = rows (color_rotation);
+        color_index = 1;
+      endif
+    elseif (! isempty (color_rotation))
+      rgb = color_rotation(color_index,:);
+      if (++color_index > num_colors)
+        color_index = 1;
+        __next_line_style__ ("incr");
+      endif
+    else
+      error ("__next_line_color__: color_rotation not initialized");
+    endif
+  else
+    print_usage ();
+  endif
+
+endfunction