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+## Copyright (C) 2008 David Bateman
+##
+## 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} {} clabel (@var{c}, @var{h})
+## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, @var{v})
+## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, "manual")
+## @deftypefnx {Function File} {} clabel (@var{c})
+## @deftypefnx {Function File} {} clabel (@var{c}, @var{h})
+## @deftypefnx {Function File} {} clabel (@dots{}, @var{prop}, @var{val}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} clabel (@dots{})
+## Adds labels to the contours of a contour plot. The contour plot is specified
+## by the contour matrix @var{c} and optionally the contourgroup object @var{h}
+## that are returned by @code{contour}, @code{contourf} and @code{contour3}.
+## The contour labels are rotated and placed in the contour itself.
+##
+## By default, all contours are labelled. However, the conours to label can be
+## specified by the vector @var{v}. If the "manual" argument is given then
+## the contours to label can be selected with the mouse.
+##
+## Additional property/value pairs that are valid properties of text objects
+## can be given and are passed to the underlying text cobjects. Additionally,
+## the property "LabelSpacing" is available allowing the spacing between labels
+## on a contour (in points) to be specified. The default is 144 points, or 2
+## inches.
+##
+## The returned value @var{h} is the set of text object that represent the
+## contour labels. The "userdata" property of the text objects contains the
+## numerical value of the contour label.
+##
+## An example of the use of @code{clabel} is
+##
+## @example
+## @group
+## [c, h] = contour (peaks(), -4 : 6);
+## clabel (c, h, -4 : 2 : 6, 'fontsize', 12);
+## @end group
+## @end example
+##
+## @seealso{contour, contourf, contour3, meshc, surfc, text}
+## @end deftypefn
+
+function retval = clabel (c, varargin)
+  label_spacing = 2 * 72;
+  have_hg = false;
+  have_labelspacing = false;
+
+  if (nargin < 1)
+    print_usage()
+  elseif (nargin == 1)
+    hparent = gca ();
+  else
+    arg = varargin{1};
+    if (isscalar (arg) && ishandle(arg) && 
+	strcmp (get (arg, "type"), "hggroup"))
+      obj = get (arg);
+      if (! isfield (obj, "contourmatrix"))
+	error ("clabel: expecting the handle to be a contour group");
+      endif
+      hg = arg;
+      have_hg = true;
+      varargin(1) = [];
+    else
+      hparent = gca ();
+    endif
+  endif
+
+  if (length(varargin) > 0 && isnumeric (varargin{1}))
+    v = varargin{1}(:);
+    varargin(1) = [];
+  else
+    v = [];
+  endif
+
+  for i = 1 : length (varargin) - 1
+    arg = varargin{i};
+    if (strcmpi (arg, "labelspacing"))
+      label_spacing = varargin{i+1};
+      have_labelspacing = true;
+      varargin(i:i+1) = [];
+      break;
+    endif
+  endfor
+
+  for i = 1 : length (varargin)
+    arg = varargin{i};
+    if (strcmpi (arg, "manual"))
+      error ("clabel: manual contouring mode not supported");
+    endif
+  endfor
+
+  if (have_hg)
+    if (! isempty (v))
+      if (have_labelspacing)
+	set (hg, "textlistmode", "manual", "textlist", v, 
+	     "labelspacing", label_spacing, "showtext", "on");
+      else
+	set (hg, "textlistmode", "manual", "textlist", v, "showtext", "on");
+      endif
+    else
+      if (have_labelspacing)
+	set (hg,"showtext", "on", "labelspacing", label_spacing);
+      else
+	set (hg,"showtext", "on");
+      endif
+    endif
+    retval = findobj (hg, "type", "text");
+    if (! isempty (varargin))
+      set (retval, varargin {:});
+    endif
+  else
+    retval =  __clabel__ (c, v, hparent, label_spacing, [], varargin{:});
+  endif
+endfunction
+
+%!demo
+%! [c, h] = contour (peaks(), -4 : 6);
+%! clabel (c, h, -4 : 2 : 6, 'fontsize', 12);
+
+%!demo
+%! [c, h] = contourf (peaks(), -7 : 6);
+%! clabel (c, h, -6 : 2 : 6, 'fontsize', 12);