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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 16. July 2000 - Kai Habel: first release |
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25 |
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26 25. September 2002 - Changes by Rafael Laboissiere <rafael@laboissiere.net> |
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27 |
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28 * Added Qbb option to normalize the input and avoid crashes in Octave. |
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29 * delaunayn accepts now a second (optional) argument that must be a string |
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30 containing extra options to the qhull command. |
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31 * Fixed doc string. The dimension of the result matrix is [m, dim+1], and |
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32 not [n, dim-1]. |
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33 |
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34 6. June 2006: Changes by Alexander Barth <abarth@marine.usf.edu> |
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35 |
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36 * triangulate non-simplicial facets |
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37 * allow options to be specified as cell array of strings |
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38 * change the default options (for compatibility with matlab) |
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39 */ |
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40 |
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41 #include <iostream> |
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42 #include <string> |
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43 |
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44 #ifdef HAVE_CONFIG_H |
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45 #include <config.h> |
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46 #endif |
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47 #include "oct.h" |
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48 #include "ov-cell.h" |
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49 |
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50 #ifdef HAVE_QHULL |
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51 extern "C" { |
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52 #include <qhull/qhull_a.h> |
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53 } |
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54 |
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55 #ifdef NEED_QHULL_VERSION |
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56 char qh_version[] = "__delaunayn__.oct 2007-08-21"; |
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57 #endif |
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58 #endif |
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59 |
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60 DEFUN_DLD (__delaunayn__, args, , |
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61 "-*- texinfo -*-\n\ |
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62 @deftypefn {Loadable Function} {@var{T} =} __delaunayn__ (@var{P}[, @var{opt}])\n\ |
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63 Undocumented internal function.\n\ |
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64 @end deftypefn") |
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65 |
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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 |
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71 retval(0) = 0.0; |
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72 std::string options = ""; |
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73 |
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74 int nargin = args.length (); |
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75 if (nargin < 1 || nargin > 2) |
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76 { |
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77 print_usage (); |
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78 return retval; |
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79 } |
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80 |
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81 Matrix p (args(0).matrix_value ()); |
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82 const octave_idx_type dim = p.columns (); |
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83 const octave_idx_type n = p.rows (); |
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84 |
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85 // default options |
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86 if (dim <= 3) |
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87 options = "Qt Qbb Qc"; |
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88 else |
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89 options = "Qt Qbb Qc Qx"; |
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90 |
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91 |
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92 if (nargin == 2) |
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93 { |
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94 if (args(1).is_empty ()) |
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95 { |
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96 // keep default options |
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97 } |
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98 else if (args(1).is_string ()) |
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99 { |
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100 // option string is directly provided |
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101 options = args(1).string_value (); |
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102 } |
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103 else if (args(1).is_cell ()) |
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104 { |
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105 options = ""; |
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106 |
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107 Cell c = args(1).cell_value (); |
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108 for (octave_idx_type i = 0; i < c.numel (); i++) |
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109 { |
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110 |
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111 if (! c.elem(i).is_string ()) |
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112 { |
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113 error ("__delaunayn__: all options must be strings"); |
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114 return retval; |
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115 } |
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116 |
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117 options = options + c.elem(i).string_value () + " "; |
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118 } |
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119 } |
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120 else |
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121 { |
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122 error ("__delaunayn__: second argument must be a string, cell of stringsor empty"); |
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123 return retval; |
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124 } |
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125 } |
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126 |
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127 //octave_stdout << "options " << options << std::endl; |
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128 |
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129 if (n > dim + 1) |
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130 { |
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131 p = p.transpose (); |
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132 double *pt_array = p.fortran_vec (); |
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133 boolT ismalloc = false; |
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134 |
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135 OCTAVE_LOCAL_BUFFER (char, flags, 250); |
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136 |
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137 sprintf (flags, "qhull d %s", options.c_str ()); |
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138 |
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139 // If you want some debugging information replace the 0 pointer |
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140 // with stdout or some other file open for writing. |
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141 |
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142 FILE *outfile = 0; |
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143 FILE *errfile = stderr; |
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144 |
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145 if (! qh_new_qhull (dim, n, pt_array, ismalloc, flags, outfile, errfile)) |
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146 { |
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147 // triangulate non-simplicial facets |
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148 qh_triangulate (); |
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149 |
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150 facetT *facet; |
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151 vertexT *vertex, **vertexp; |
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152 octave_idx_type nf = 0, i = 0; |
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153 |
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154 FORALLfacets |
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155 { |
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156 if (! facet->upperdelaunay) |
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157 nf++; |
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158 |
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159 // Double check |
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160 if (! facet->simplicial) |
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161 { |
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162 error ("__delaunayn__: Qhull returned non-simplicial facets -- try delaunayn with different options"); |
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163 break; |
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164 } |
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165 } |
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166 |
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167 Matrix simpl (nf, dim+1); |
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168 |
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169 FORALLfacets |
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170 { |
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171 if (! facet->upperdelaunay) |
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172 { |
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173 octave_idx_type j = 0; |
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174 |
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175 FOREACHvertex_ (facet->vertices) |
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176 { |
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177 // if delaunayn crashes, enable this check |
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178 #if 0 |
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179 if (j > dim) |
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180 { |
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181 error ("__delaunayn__: internal error. Qhull returned non-simplicial facets"); |
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182 return retval; |
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183 } |
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184 #endif |
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185 |
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186 simpl(i, j++) = 1 + qh_pointid(vertex->point); |
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187 } |
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188 i++; |
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189 } |
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190 } |
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191 |
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192 retval(0) = simpl; |
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193 |
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194 // free long memory |
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195 qh_freeqhull (! qh_ALL); |
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196 |
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197 // free short memory and memory allocator |
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198 int curlong, totlong; |
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199 qh_memfreeshort (&curlong, &totlong); |
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200 |
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201 if (curlong || totlong) |
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202 warning ("__delaunay__: did not free %d bytes of long memory (%d pieces)", |
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203 totlong, curlong); |
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204 } |
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205 else |
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206 error ("__delaunayn__: qhull failed."); |
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207 } |
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208 else if (n == dim + 1) |
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209 { |
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210 // one should check if nx points span a simplex |
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211 // I will look at this later. |
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212 RowVector vec (n); |
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213 for (octave_idx_type i = 0; i < n; i++) |
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214 vec(i) = i + 1.0; |
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215 |
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216 retval(0) = vec; |
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217 } |
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218 |
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219 #else |
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220 error ("__delaunayn__: not available in this version of Octave"); |
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221 #endif |
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222 |
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223 return retval; |
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224 } |
