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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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 /* |
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25 29. July 2000 - Kai Habel: first release |
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26 2002-04-22 Paul Kienzle |
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27 * Use warning(...) function rather than writing to cerr |
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28 2006-05-01 Tom Holroyd |
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29 * add support for consistent winding in all dimensions; output is |
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30 * guaranteed to be simplicial. |
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31 */ |
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32 |
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33 #include <sstream> |
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34 |
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35 #ifdef HAVE_CONFIG_H |
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36 #include <config.h> |
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37 #endif |
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38 #include "oct.h" |
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39 #include "Cell.h" |
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40 |
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41 #ifdef HAVE_QHULL |
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42 #if defined(HAVE__SNPRINTF) && !defined(HAVE_SNPRINTF) |
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43 #define snprintf _snprintf |
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44 #endif |
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45 |
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46 extern "C" { |
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47 #include <qhull/qhull_a.h> |
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48 } |
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49 |
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50 #ifdef NEED_QHULL_VERSION |
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51 char qh_version[] = "convhulln.oct 2007-07-24"; |
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52 #endif |
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53 #endif |
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54 |
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55 DEFUN_DLD (convhulln, args, , |
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56 "-*- texinfo -*-\n\ |
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57 @deftypefn {Loadable Function} {@var{H} =} convhulln (@var{p})\n\ |
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58 @deftypefnx {Loadable Function} {@var{H} =} convhulln (@var{p}, @var{opt})\n\ |
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59 Returns an index vector to the points of the enclosing convex hull.\n\ |
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60 The input matrix of size [n, dim] contains n points of dimension dim.\n\n\ |
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61 If a second optional argument is given, it must be a string or cell array\n\ |
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62 of strings containing options for the underlying qhull command. (See\n\ |
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63 the Qhull documentation for the available options.) The default options\n\ |
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64 are \"s Qci Tcv\".\n\n\ |
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65 @seealso{convhull, delaunayn}\n\ |
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66 @end deftypefn") |
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67 { |
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68 octave_value_list retval; |
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69 |
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70 #ifdef HAVE_QHULL |
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71 std::string options; |
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72 |
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73 int nargin = args.length (); |
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74 if (nargin < 1 || nargin > 2) |
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75 { |
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76 print_usage (); |
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77 return retval; |
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78 } |
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79 |
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80 if (nargin == 2) |
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81 { |
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82 if (args (1).is_string ()) |
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83 options = args(1).string_value (); |
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84 else if (args(1).is_cell ()) |
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85 { |
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86 Cell c = args(1).cell_value (); |
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87 options = ""; |
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88 for (octave_idx_type i = 0; i < c.numel (); i++) |
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89 { |
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90 if (! c.elem(i).is_string ()) |
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91 { |
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92 error ("convhulln: second argument must be a string or cell array of strings"); |
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93 return retval; |
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94 } |
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95 |
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96 options = options + c.elem(i).string_value() + " "; |
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97 } |
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98 } |
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99 else |
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100 { |
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101 error ("convhulln: second argument must be a string or cell array of strings"); |
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102 return retval; |
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103 } |
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104 } |
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105 else |
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106 // turn on some consistency checks |
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107 options = "s Qci Tcv"; |
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108 |
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109 Matrix p (args(0).matrix_value ()); |
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110 |
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111 const octave_idx_type dim = p.columns (); |
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112 const octave_idx_type n = p.rows (); |
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113 p = p.transpose (); |
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114 |
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115 double *pt_array = p.fortran_vec (); |
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116 |
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117 boolT ismalloc = False; |
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118 |
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119 OCTAVE_LOCAL_BUFFER (char, flags, 250); |
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120 |
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121 // hmm, lots of options for qhull here |
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122 // QJ guarantees that the output will be triangles |
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123 snprintf (flags, 250, "qhull QJ %s", options.c_str ()); |
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124 |
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125 if (! qh_new_qhull (dim, n, pt_array, ismalloc, flags, NULL, stderr)) |
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126 { |
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127 // If you want some debugging information replace the NULL |
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128 // pointer with stdout |
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129 |
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130 vertexT *vertex, **vertexp; |
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131 facetT *facet; |
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132 setT *vertices; |
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133 unsigned int nf = qh num_facets; |
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134 |
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135 Matrix idx (nf, dim); |
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136 |
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137 octave_idx_type j, i = 0; |
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138 FORALLfacets |
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139 { |
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140 j = 0; |
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141 if (! facet->simplicial) |
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142 // should never happen with QJ |
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143 error ("convhulln: non-simplicial facet"); |
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144 |
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145 if (dim == 3) |
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146 { |
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147 vertices = qh_facet3vertex (facet); |
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148 FOREACHvertex_ (vertices) |
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149 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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150 qh_settempfree (&vertices); |
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151 } |
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152 else |
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153 { |
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154 if (facet->toporient ^ qh_ORIENTclock) |
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155 { |
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156 FOREACHvertex_ (facet->vertices) |
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157 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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158 } |
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159 else |
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160 { |
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161 FOREACHvertexreverse12_ (facet->vertices) |
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162 idx(i, j++) = 1 + qh_pointid(vertex->point); |
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163 } |
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164 } |
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165 if (j < dim) |
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166 // likewise but less fatal |
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167 warning ("facet %d only has %d vertices", i, j); |
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168 i++; |
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169 } |
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170 retval(0) = octave_value (idx); |
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171 } |
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172 |
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173 // free long memory |
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174 qh_freeqhull (! qh_ALL); |
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175 |
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176 // free short memory and memory allocator |
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177 int curlong, totlong; |
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178 qh_memfreeshort (&curlong, &totlong); |
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179 |
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180 if (curlong || totlong) |
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181 warning ("convhulln: did not free %d bytes of long memory (%d pieces)", |
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182 totlong, curlong); |
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183 #else |
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184 error ("convhulln: not available in this version of Octave"); |
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185 #endif |
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186 |
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187 return retval; |
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188 } |
