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+## Copyright (C) 2007  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 2, 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, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} triplot (@var{tri}, @var{x}, @var{y})
+## @deftypefnx {Function File} {} triplot (@var{tri}, @var{x}, @var{y}, @var{linespec})
+## @deftypefnx {Function File} {@var{h} = } triplot (@dots{})
+## Plot a triangular mesh in 2D. The variable @var{tri} is the triangular
+## meshing of the points @code{(@var{x}, @var{y})} which is returned from
+## @code{delaunay}. If given, the @var{linespec} determines the properties
+## to use for the lines. The output argument @var{h} is the graphic handle
+## to the plot.
+## @seealso{plot, trimesh, delaunay}
+## @end deftypefn
+
+function h = triplot (tri, x, y, varargin)
+
+  if (nargin < 3)
+    print_usage();
+  endif
+
+  idx = tri (:, [1, 2, 3, 1]).';
+  nt = size(tri, 1);
+  if (nargout > 0)
+    h = plot([x(idx); NaN*ones(1, nt)](:), ...
+	     [y(idx); NaN*ones(1, nt)](:), varargin{:});
+  else
+    plot([x(idx); NaN*ones(1, nt)](:), ...
+	 [y(idx); NaN*ones(1, nt)](:), varargin{:});
+  endif
+endfunction
+
+%!demo
+%! rand ('state', 2)
+%! x = rand (20, 1);
+%! y = rand (20, 1);
+%! tri = delaunay (x, y);
+%! triplot (tri, x, y);