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1 ## Copyright (C) 2007 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} {} trimesh (@var{tri}, @var{x}, @var{y}, @var{z}) |
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21 ## @deftypefnx {Function File} {@var{h} = } trimesh (@dots{}) |
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22 ## Plot a triangular mesh 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 to the plot. |
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27 ## @seealso{triplot, delaunay3} |
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28 ## @end deftypefn |
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29 |
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30 function h = trimesh (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 idx = tri(:, [1,2,3,1]).'; |
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42 nt = size (tri, 1); |
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43 ## FIXME We should really use patch instead of plot3, but we don't |
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44 ## have a patch function, and probably won't in 3D that works with |
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45 ## gnuplot |
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46 if (nargout > 0) |
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47 h = plot3 ([x(idx); NaN*ones(1, nt)](:), |
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48 [y(idx); NaN*ones(1, nt)](:), |
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49 [z(idx); NaN*ones(1, nt)](:), varargin{:}); |
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50 else |
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51 plot3 ([x(idx); NaN*ones(1, nt)](:), |
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52 [y(idx); NaN*ones(1, nt)](:), |
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53 [z(idx); NaN*ones(1, nt)](:), varargin{:}); |
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54 endif |
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55 endif |
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56 endfunction |
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57 |
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58 %!demo |
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59 %! rand ('state', 10) |
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60 %! x = 3 - 6 * rand (1, 50); |
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61 %! y = 3 - 6 * rand (1, 50); |
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62 %! z = peaks (x, y); |
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63 %! tri = delaunay (x, y); |
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64 %! trimesh (tri, x, y, z); |
