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annotate scripts/geometry/triplot.m @ 7017:a1dbe9d80eee

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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children eb7bdde776f2
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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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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 triangular mesh in 2D. The variable @var{tri} is the triangular
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24 ## meshing of the points @code{(@var{x}, @var{y})} which is returned from
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25 ## @code{delaunay}. If given, the @var{linespec} determines the properties
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26 ## to use for the lines. The output argument @var{h} is the graphic handle
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27 ## to the plot.
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28 ## @seealso{plot, trimesh, delaunay}
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29 ## @end deftypefn
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30
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31 function h = triplot (tri, x, y, varargin)
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32
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33 if (nargin < 3)
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34 print_usage ();
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35 endif
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36
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37 idx = tri(:, [1, 2, 3, 1]).';
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38 nt = size (tri, 1);
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39 if (nargout > 0)
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40 h = plot ([x(idx); NaN*ones(1, nt)](:),
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41 [y(idx); NaN*ones(1, nt)](:), varargin{:});
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42 else
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43 plot ([x(idx); NaN*ones(1, nt)](:),
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44 [y(idx); NaN*ones(1, nt)](:), varargin{:});
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45 endif
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46 endfunction
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47
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48 %!demo
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49 %! rand ('state', 2)
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50 %! x = rand (20, 1);
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51 %! y = rand (20, 1);
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52 %! tri = delaunay (x, y);
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53 %! triplot (tri, x, y);