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1 /* |
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2 |
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3 Copyright (C) 2000 Kai Habel |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 /* |
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24 29. July 2000 - Kai Habel: first release |
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25 2002-04-22 Paul Kienzle |
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26 * Use warning(...) function rather than writing to cerr |
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27 2006-05-01 Tom Holroyd |
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28 * add support for consistent winding in all dimensions; output is |
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29 * guaranteed to be simplicial. |
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30 */ |
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31 |
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32 #include <sstream> |
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33 |
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34 #ifdef HAVE_CONFIG_H |
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35 #include <config.h> |
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36 #endif |
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37 #include "oct.h" |
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38 #include "Cell.h" |
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39 |
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40 #ifdef HAVE_QHULL |
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41 #if defined(HAVE__SNPRINTF) && !defined(HAVE_SNPRINTF) |
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42 #define snprintf _snprintf |
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43 #endif |
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44 |
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45 extern "C" { |
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46 #include <qhull/qhull_a.h> |
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47 } |
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48 |
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49 #ifdef NEED_QHULL_VERSION |
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50 char qh_version[] = "convhulln.oct 2007-07-24"; |
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51 #endif |
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52 #endif |
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53 |
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54 DEFUN_DLD (convhulln, args, , |
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55 "-*- texinfo -*-\n\ |
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56 @deftypefn {Loadable Function} {@var{H} =} convhulln (@var{p})\n\ |
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57 @deftypefnx {Loadable Function} {@var{H} =} convhulln (@var{p}, @var{opt})\n\ |
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58 Returns an index vector to the points of the enclosing convex hull.\n\ |
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59 The input matrix of size [n, dim] contains n points of dimension dim.\n\n\ |
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60 If a second optional argument is given, it must be a string or cell array\n\ |
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61 of strings containing options for the underlying qhull command. (See\n\ |
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62 the Qhull documentation for the available options.) The default options\n\ |
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63 are \"s Qci Tcv\".\n\n\ |
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64 @seealso{convhull, delaunayn}\n\ |
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65 @end deftypefn") |
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66 { |
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67 octave_value_list retval; |
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68 |
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69 #ifdef HAVE_QHULL |
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70 std::string options; |
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71 |
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72 int nargin = args.length (); |
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73 if (nargin < 1 || nargin > 2) |
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74 { |
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75 print_usage (); |
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76 return retval; |
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77 } |
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78 |
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79 if (nargin == 2) |
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80 { |
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81 if (args (1).is_string ()) |
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82 options = args(1).string_value (); |
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83 else if (args(1).is_cell ()) |
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84 { |
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85 Cell c = args(1).cell_value (); |
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86 options = ""; |
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87 for (octave_idx_type i = 0; i < c.numel (); i++) |
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88 { |
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89 if (! c.elem(i).is_string ()) |
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90 { |
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91 error ("convhulln: second argument must be a string or cell array of strings"); |
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92 return retval; |
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93 } |
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94 |
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95 options = options + c.elem(i).string_value() + " "; |
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96 } |
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97 } |
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98 else |
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99 { |
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100 error ("convhulln: second argument must be a string or cell array of strings"); |
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101 return retval; |
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102 } |
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103 } |
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104 else |
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105 // turn on some consistency checks |
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106 options = "s Qci Tcv"; |
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107 |
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108 Matrix p (args(0).matrix_value ()); |
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109 |
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110 const octave_idx_type dim = p.columns (); |
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111 const octave_idx_type n = p.rows (); |
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112 p = p.transpose (); |
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113 |
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114 double *pt_array = p.fortran_vec (); |
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115 |
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116 boolT ismalloc = False; |
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117 |
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118 OCTAVE_LOCAL_BUFFER (char, flags, 250); |
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119 |
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120 // hmm, lots of options for qhull here |
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121 // QJ guarantees that the output will be triangles |
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122 snprintf (flags, 250, "qhull QJ %s", options.c_str ()); |
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123 |
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124 if (! qh_new_qhull (dim, n, pt_array, ismalloc, flags, NULL, stderr)) |
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125 { |
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126 // If you want some debugging information replace the NULL |
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127 // pointer with stdout |
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128 |
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129 vertexT *vertex, **vertexp; |
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130 facetT *facet; |
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131 setT *vertices; |
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132 unsigned int nf = qh num_facets; |
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133 |
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134 Matrix idx (nf, dim); |
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135 |
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136 octave_idx_type j, i = 0; |
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137 FORALLfacets |
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138 { |
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139 j = 0; |
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140 if (! facet->simplicial) |
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141 // should never happen with QJ |
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142 error ("convhulln: non-simplicial facet"); |
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143 |
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144 if (dim == 3) |
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145 { |
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146 vertices = qh_facet3vertex (facet); |
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147 FOREACHvertex_ (vertices) |
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148 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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149 qh_settempfree (&vertices); |
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150 } |
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151 else |
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152 { |
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153 if (facet->toporient ^ qh_ORIENTclock) |
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154 { |
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155 FOREACHvertex_ (facet->vertices) |
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156 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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157 } |
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158 else |
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159 { |
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160 FOREACHvertexreverse12_ (facet->vertices) |
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161 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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162 } |
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163 } |
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164 if (j < dim) |
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165 // likewise but less fatal |
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166 warning ("facet %d only has %d vertices", i, j); |
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167 i++; |
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168 } |
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169 retval(0) = octave_value (idx); |
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170 } |
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171 |
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172 // free long memory |
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173 qh_freeqhull (! qh_ALL); |
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174 |
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175 // free short memory and memory allocator |
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176 int curlong, totlong; |
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177 qh_memfreeshort (&curlong, &totlong); |
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178 |
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179 if (curlong || totlong) |
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180 warning ("convhulln: did not free %d bytes of long memory (%d pieces)", |
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181 totlong, curlong); |
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182 #else |
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183 error ("convhulln: not available in this version of Octave"); |
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184 #endif |
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185 |
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186 return retval; |
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187 } |
