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annotate scripts/plot/draw/trimesh.m @ 20737:2d9ec16fa960

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Print error, rather than aborting, if mex function mxIsFromGlobalWS is used (bug #46070). * mex.cc (mxIsFromGlobalWS): Call mexErrMsgTxt rather than abort() in function.
author Rik <rik@octave.org>
date Tue, 29 Sep 2015 12:00:11 -0700
parents 9fc020886ae9
children
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1 ## Copyright (C) 2007-2015 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}, @var{c})
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21 ## @deftypefnx {Function File} {} trimesh (@var{tri}, @var{x}, @var{y}, @var{z})
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22 ## @deftypefnx {Function File} {} trimesh (@var{tri}, @var{x}, @var{y})
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23 ## @deftypefnx {Function File} {} trimesh (@dots{}, @var{prop}, @var{val}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} trimesh (@dots{})
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25 ## Plot a 3-D triangular wireframe mesh.
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26 ##
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27 ## In contrast to @code{mesh}, which plots a mesh using rectangles,
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28 ## @code{trimesh} plots the mesh using triangles.
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29 ##
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30 ## @var{tri} is typically the output of a Delaunay triangulation over the
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31 ## grid of @var{x}, @var{y}. Every row of @var{tri} represents one triangle
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32 ## and contains three indices into [@var{x}, @var{y}] which are the
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33 ## vertices of the triangles in the x-y plane. @var{z} determines the
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34 ## height above the plane of each vertex. If no @var{z} input is given then
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35 ## the triangles are plotted as a 2-D figure.
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36 ##
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37 ## The color of the trimesh is computed by linearly scaling the @var{z} values
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38 ## to fit the range of the current colormap. Use @code{caxis} and/or
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39 ## change the colormap to control the appearance.
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40 ##
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41 ## Optionally, the color of the mesh can be specified independently of @var{z}
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42 ## by supplying a color matrix, @var{c}. If @var{z} has N elements, then
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43 ## @var{c} should be an Nx1 vector for colormap data or an Nx3 matrix for
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44 ## RGB data.
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45 ##
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46 ## Any property/value pairs are passed directly to the underlying patch object.
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47 ##
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48 ## The optional return value @var{h} is a graphics handle to the created patch
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49 ## object.
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50 ## @seealso{mesh, tetramesh, triplot, trisurf, delaunay, patch, hidden}
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51 ## @end deftypefn
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52
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53 function h = trimesh (tri, x, y, z, varargin)
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54
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55 if (nargin < 3)
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56 print_usage ();
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57 endif
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58
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59 if (nargin == 3)
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60 htmp = triplot (tri, x, y);
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61 elseif (ischar (z))
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62 htmp = triplot (tri, x, y, z, varargin{:});
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63 else
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64 ## Process color argument
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65 if (nargin > 4 && isnumeric (varargin{1}))
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66 c = varargin{1};
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67 varargin(1) = [];
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68 if (isvector (c))
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69 if (numel (c) != numel (z))
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70 error ("trimesh: C must have 'numel (Z)' elements");
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71 endif
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72 c = c(:);
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73 elseif (rows (c) != numel (z) || columns (c) != 3)
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74 error ("trimesh: TrueColor C matrix must be 'numel (Z)' rows by 3 columns");
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75 endif
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76 else
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77 c = z(:);
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78 endif
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79
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80 hax = newplot ();
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81
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82 ## Tag object as "trimesh" so that hidden() can find it.
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83 htmp = patch ("Vertices", [x(:), y(:), z(:)], "Faces", tri,
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84 "FaceVertexCdata", c, "EdgeColor", "flat", "FaceColor", "w",
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85 "Tag", "trimesh", varargin{:});
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86 if (! ishold ())
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87 set (hax, "view", [-37.5, 30], "box", "off",
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88 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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89 endif
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90 endif
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91
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92 if (nargout > 0)
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93 h = htmp;
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94 endif
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95
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96 endfunction
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97
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98
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99 %!demo
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100 %! clf;
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101 %! colormap ('default');
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102 %! old_state = rand ('state');
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103 %! restore_state = onCleanup (@() rand ('state', old_state));
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104 %! rand ('state', 10);
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105 %! N = 10;
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106 %! x = 3 - 6 * rand (N, N);
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107 %! y = 3 - 6 * rand (N, N);
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108 %! z = peaks (x, y);
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109 %! tri = delaunay (x(:), y(:));
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110 %! trimesh (tri, x(:), y(:), z(:));
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111
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112 ## Test input validation
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113 %!error trimesh ()
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114 %!error trimesh (1)
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115 %!error trimesh (1,2)
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116 %!error <C must have 'numel \(Z\)' elements> trimesh (1,2,3,4,[5 6])
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117 %!error <C must have 'numel \(Z\)' elements> trimesh (1,2,3,4,[5 6]')
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118 %!error <TrueColor C matrix must> trimesh ([1;1],[2;2],[3;3],[4;4],zeros(3,3))
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119 %!error <TrueColor C matrix must> trimesh ([1;1],[2;2],[3;3],[4;4],zeros(2,2))
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120