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author Rik <octave@nomad.inbox5.com>
date Sun, 01 Aug 2010 20:22:17 -0700
parents 693e22af08ae
children 2c356a35d7f5
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1 ## Copyright (C) 2009 Martin Helm
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 3 of the License, or
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6 ## (at your option) any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful,
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 ## GNU General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this program; if not, see http://www.gnu.org/licenses/gpl.html.
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15
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16 ## -*- texinfo -*-
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17 ## @deftypefn {Function File} {[@var{cd}] =} isocolors (@var{c}, @var{v})
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18 ## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{x}, @var{y}, @var{z}, @var{c}, @var{v})
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19 ## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{x}, @var{y}, @var{z}, @var{r}, @var{g}, @var{b}, @var{v})
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20 ## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{r}, @var{g}, @var{b}, @var{v})
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21 ## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@dots{}, @var{p})
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22 ## @deftypefnx {Function File} isocolors (@dots{})
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23 ##
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24 ## If called with one output argument and the first input argument
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25 ## @var{c} is a three--dimensional array that contains color values and
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26 ## the second input argument @var{v} keeps the vertices of a geometry
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27 ## then return a matrix @var{cd} with color data information for the
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28 ## geometry at computed points
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29 ## @command{[x, y, z] = meshgrid (1:l, 1:m, 1:n)}. The output argument
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30 ## @var{cd} can be taken to manually set FaceVertexCData of a patch.
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31 ##
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32 ## If called with further input arguments @var{x}, @var{y} and @var{z}
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33 ## which are three--dimensional arrays of the same size than @var{c}
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34 ## then the color data is taken at those given points. Instead of the
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35 ## color data @var{c} this function can also be called with RGB values
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36 ## @var{r}, @var{g}, @var{b}. If input argumnets @var{x}, @var{y},
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37 ## @var{z} are not given then again @command{meshgrid} computed values
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38 ## are taken.
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39 ##
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40 ## Optionally, the patch handle @var{p} can be given as the last input
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41 ## argument to all variations of function calls instead of the vertices
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42 ## data @var{v}. Finally, if no output argument is given then directly
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43 ## change the colors of a patch that is given by the patch handle
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44 ## @var{p}.
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45 ##
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46 ## For example:
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47 ##
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48 ## @example
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49 ## function [] = isofinish (p)
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50 ## set (gca, "PlotBoxAspectRatioMode", "manual", \
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51 ## "PlotBoxAspectRatio", [1 1 1]);
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52 ## set (p, "FaceColor", "interp");
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53 ## ## set (p, "FaceLighting", "flat");
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54 ## ## light ("Position", [1 1 5]); ## Available with JHandles
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55 ## endfunction
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56 ##
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57 ## N = 15; ## Increase number of vertices in each direction
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58 ## iso = .4; ## Change isovalue to .1 to display a sphere
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59 ## lin = linspace (0, 2, N);
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60 ## [x, y, z] = meshgrid (lin, lin, lin);
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61 ## c = abs ((x-.5).^2 + (y-.5).^2 + (z-.5).^2);
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62 ## figure (); ## Open another figure window
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63 ##
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64 ## subplot (2, 2, 1); view (-38, 20);
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65 ## [f, v] = isosurface (x, y, z, c, iso);
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66 ## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
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67 ## cdat = rand (size (c)); ## Compute random patch color data
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68 ## isocolors (x, y, z, cdat, p); ## Directly set colors of patch
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69 ## isofinish (p); ## Call user function isofinish
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70 ##
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71 ## subplot (2, 2, 2); view (-38, 20);
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72 ## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
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73 ## [r, g, b] = meshgrid (lin, 2-lin, 2-lin);
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74 ## cdat = isocolors (x, y, z, c, v); ## Compute color data vertices
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75 ## set (p, "FaceVertexCData", cdat); ## Set color data manually
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76 ## isofinish (p);
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77 ##
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78 ## subplot (2, 2, 3); view (-38, 20);
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79 ## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
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80 ## cdat = isocolors (r, g, b, c, p); ## Compute color data patch
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81 ## set (p, "FaceVertexCData", cdat); ## Set color data manually
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82 ## isofinish (p);
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83 ##
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84 ## subplot (2, 2, 4); view (-38, 20);
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85 ## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
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86 ## r = g = b = repmat ([1:N] / N, [N, 1, N]); ## Black to white
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87 ## cdat = isocolors (x, y, z, r, g, b, v);
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88 ## set (p, "FaceVertexCData", cdat);
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89 ## isofinish (p);
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90 ## @end example
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91 ##
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92 ## @seealso{isosurface, isonormals, isocaps}
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93 ##
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94 ## @end deftypefn
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95
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96 ## Author: Martin Helm <martin@mhelm.de>
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97
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98 function varargout = isocolors(varargin)
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99 calc_rgb = false;
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100 switch nargin
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101 case 2
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102 c = varargin{1};
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103 vp = varargin{2};
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104 x = 1:size (c, 2);
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105 y = 1:size (c, 1);
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106 z = 1:size (c, 3);
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107 case 4
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108 calc_rgb = true;
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109 R = varargin{1};
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110 G = varargin{2};
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111 B = varargin{3};
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112 vp = varargin{4};
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113 x = 1:size (R, 1);
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114 y = 1:size (R, 2);
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115 z = 1:size (R, 3);
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116 case 5
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117 x = varargin{1};
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118 y = varargin{2};
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119 z = varargin{3};
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120 c = varargin{4};
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121 vp = varargin{5};
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122 case 7
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123 calc_rgb = true;
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124 x = varargin{1};
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125 y = varargin{2};
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126 z = varargin{3};
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127 R = varargin{4};
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128 G = varargin{5};
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129 B = varargin{6};
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130 vp = varargin{7};
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131 otherwise
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132 print_usage ();
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133 endswitch
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134 if (ismatrix (vp) && size (vp,2) == 3)
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135 pa = [];
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136 v = vp;
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137 elseif ( ishandle (vp) )
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138 pa = vp;
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139 v = get (pa, "Vertices");
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140 else
10635
d1978e7364ad Print name of function in error() string messages.
Rik <octave@nomad.inbox5.com>
parents: 10226
diff changeset
141 error("isocolors: last argument is not a vertex list or patch handle");
9110
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142 endif
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143 if ( calc_rgb )
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144 new_col = zeros (size (v, 1), 3);
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145 new_col(:, 1) = __interp_cube__ (x, y, z, R, v, "values" );
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146 new_col(:, 2) = __interp_cube__ (x, y, z, G, v, "values" );
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147 new_col(:, 3) = __interp_cube__ (x, y, z, B, v, "values" );
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148 else
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149 new_col = __interp_cube__ (x, y, z, c, v, "values" );
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150 endif
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151 switch nargout
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152 case 0
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153 if (!isempty (pa))
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154 set (pa, "FaceVertexCData", new_col);
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155 endif
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156 case 1
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157 varargout = {new_col};
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158 otherwise
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159 print_usage ();
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160 endswitch
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161 endfunction
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162
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parents:
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163 %!test
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164 %! [x, y, z] = meshgrid (0:.5:2, 0:.5:2, 0:.5:2);
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165 %! c = (x-.5).^2 + (y-.5).^2 + (z-.5).^2;
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166 %! [f, v] = isosurface (x, y, z, c, .4);
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167 %! cdat = isocolors (x, y, z, c, v);
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168 %! assert (size (cdat, 1) == size (v, 1));
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parents:
diff changeset
169 ## Can't create a patch handle for tests without a figure