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annotate scripts/geometry/trisurf.m @ 12267:8ef6a4373310 release-3-4-x

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Add undocumented function trisurf to manual.
author Rik <octave@nomad.inbox5.com>
date Thu, 27 Jan 2011 19:12:31 -0800
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children 482cf3aad915
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1 ## Copyright (C) 2007-2011 David Bateman
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} trisurf (@var{tri}, @var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {@var{h} =} trisurf (@dots{})
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22 ## Plot a triangular surface in 3D@. The variable @var{tri} is the triangular
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23 ## meshing of the points @code{(@var{x}, @var{y})} which is returned
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24 ## from @code{delaunay}. The variable @var{z} is value at the point
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25 ## @code{(@var{x}, @var{y})}. The output argument @var{h} is the graphic
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26 ## handle of the plot.
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27 ## @seealso{triplot, trimesh, delaunay3}
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28 ## @end deftypefn
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29
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30 function h = trisurf (tri, x, y, z, varargin)
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31
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32 if (nargin < 3)
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33 print_usage ();
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34 endif
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35
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36 if (nargin == 3)
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37 triplot (tri, x, y);
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38 elseif (ischar (z))
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39 triplot (tri, x, y, z, varargin{:});
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40 else
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41 if (nargin > 4 && isnumeric (varargin{1}))
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42 c = varargin{1};
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43 varargin(1) = [];
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44 else
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45 c = z;
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46 endif
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47
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48 newplot ();
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49 if (nargout > 0)
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50 h = patch ("Faces", tri, "Vertices", [x(:), y(:), z(:)],
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51 "FaceVertexCData", reshape (c, numel (c), 1),
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52 "FaceColor", "flat", "EdgeColor", "none",
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53 varargin{:});
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54 else
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55 patch ("Faces", tri, "Vertices", [x(:), y(:), z(:)],
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56 "FaceVertexCData", reshape (c, numel (c), 1),
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57 "FaceColor", "flat", "EdgeColor", "none",
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58 varargin{:});
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59 endif
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60
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61 if (! ishold ())
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62 set (gca(), "view", [-37.5, 30],
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63 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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64 endif
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65 endif
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66 endfunction
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67
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68 %!demo
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69 %! N = 10;
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70 %! rand ('state', 10)
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71 %! x = 3 - 6 * rand (N, N);
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72 %! y = 3 - 6 * rand (N, N);
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73 %! z = peaks (x, y);
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74 %! tri = delaunay (x(:), y(:));
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75 %! trisurf (tri, x(:), y(:), z(:));