update packages

[CreaPhase.git] / octave_packages / m / plot / trimesh.m

diff --git a/octave_packages/m/plot/trimesh.m b/octave_packages/m/plot/trimesh.m
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+## Copyright (C) 2007-2012 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} {} trimesh (@var{tri}, @var{x}, @var{y}, @var{z})
+## @deftypefnx {Function File} {@var{h} =} trimesh (@dots{})
+## Plot a triangular mesh in 3D@.  The variable @var{tri} is the triangular
+## meshing of the points @code{(@var{x}, @var{y})} which is returned
+## from @code{delaunay}.  The variable @var{z} is value at the point
+## @code{(@var{x}, @var{y})}.
+##
+## The optional return value @var{h} is a graphics handle to the created plot.
+## @seealso{triplot, trisurf, delaunay3}
+## @end deftypefn
+
+function h = trimesh (tri, x, y, z, varargin)
+
+  if (nargin < 3)
+    print_usage ();
+  endif
+
+  if (nargin == 3)
+    triplot (tri, x, y);
+  elseif (ischar (z))
+    triplot (tri, x, y, z, varargin{:});
+  else
+    newplot ();
+    handle = patch ("Vertices", [x(:), y(:), z(:)], "Faces", tri,
+                    "FaceColor", "none", "EdgeColor", __next_line_color__(),
+                    varargin{:});
+    if (! ishold ())
+      set (gca(), "view", [-37.5, 30],
+           "xgrid", "on", "ygrid", "on", "zgrid", "on");
+    endif
+    if (nargout > 0)
+      h = handle;
+    endif
+  endif
+
+endfunction
+
+
+%!demo
+%! clf
+%! old_state = rand ("state");
+%! restore_state = onCleanup (@() rand ("state", old_state));
+%! rand ("state", 10);
+%! N = 10;
+%! x = 3 - 6 * rand (N, N);
+%! y = 3 - 6 * rand (N, N);
+%! z = peaks (x, y);
+%! tri = delaunay (x(:), y(:));
+%! trimesh (tri, x(:), y(:), z(:));
+