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annotate scripts/plot/triplot.m @ 17475:fd01c78caa0b

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Added tag ss-3-7-7 for changeset cc13924a4266
author John W. Eaton <jwe@octave.org>
date Mon, 23 Sep 2013 13:31:11 -0400
parents eaab03308c0b
children
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 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} {} triplot (@var{tri}, @var{x}, @var{y})
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21 ## @deftypefnx {Function File} {} triplot (@var{tri}, @var{x}, @var{y}, @var{linespec})
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22 ## @deftypefnx {Function File} {@var{h} =} triplot (@dots{})
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23 ## Plot a 2-D triangular mesh.
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24 ##
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25 ## @var{tri} is typically the output of a Delaunay triangulation over the
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26 ## grid of @var{x}, @var{y}. Every row of @var{tri} represents one triangle
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27 ## and contains three indices into [@var{x}, @var{y}] which are the
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28 ## vertices of the triangles in the x-y plane.
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29 ##
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30 ## The linestyle to use for the plot can be defined with the argument
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31 ## @var{linespec} of the same format as the @code{plot} command.
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32 ##
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33 ## The optional return value @var{h} is a graphics handle to the created
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34 ## patch object.
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35 ## @seealso{plot, trimesh, trisurf, delaunay}
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36 ## @end deftypefn
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37
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38 function h = triplot (tri, x, y, varargin)
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39
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40 if (nargin < 3)
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41 print_usage ();
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42 endif
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43
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44 idx = tri(:, [1, 2, 3, 1]).';
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45 nt = rows (tri);
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46 handle = plot ([x(idx); NaN(1, nt)](:),
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47 [y(idx); NaN(1, nt)](:), varargin{:});
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48
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49 if (nargout > 0)
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50 h = handle;
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51 endif
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52
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53 endfunction
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54
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55
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56 %!demo
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57 %! clf;
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58 %! old_state = rand ('state');
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59 %! restore_state = onCleanup (@() rand ('state', old_state));
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60 %! rand ('state', 2);
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61 %! N = 20;
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62 %! x = rand (N, 1);
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63 %! y = rand (N, 1);
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64 %! tri = delaunay (x, y);
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65 %! triplot (tri, x, y);
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