Mercurial > octave-nkf
view src/DLD-FUNCTIONS/__voronoi__.cc @ 12312:b10ea6efdc58 release-3-4-x ss-3-3-91
version is now 3.3.91
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 31 Jan 2011 08:36:58 -0500 |
parents | 12df7854fa7c |
children | 3641167e5b75 |
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/* Copyright (C) 2000-2011 Kai Habel This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ /* 20. Augiust 2000 - Kai Habel: first release */ /* 2003-12-14 Rafael Laboissiere <rafael@laboissiere.net> Added optional second argument to pass options to the underlying qhull command */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <cstdio> #include "lo-ieee.h" #include "Cell.h" #include "defun-dld.h" #include "error.h" #include "oct-obj.h" #ifdef HAVE_QHULL extern "C" { #include <qhull/qhull_a.h> } #ifdef NEED_QHULL_VERSION char qh_version[] = "__voronoi__.oct 2007-07-24"; #endif #endif DEFUN_DLD (__voronoi__, args, , "-*- texinfo -*-\n\ @deftypefn {Loadable Function} {@var{tri} =} __voronoi__ (@var{point})\n\ @deftypefnx {Loadable Function} {@var{tri} =} __voronoi__ (@var{point}, @var{options})\n\ Undocumented internal function.\n\ @end deftypefn") { octave_value_list retval; #ifdef HAVE_QHULL retval(0) = 0.0; int nargin = args.length (); if (nargin < 1 || nargin > 2) { print_usage (); return retval; } const char *options; if (nargin == 2) { if (! args (1).is_string ()) { error ("__voronoi__: OPTIONS argument must be a string"); return retval; } options = args (1).string_value().c_str (); } else options = ""; Matrix p (args(0).matrix_value ()); const octave_idx_type dim = p.columns (); const octave_idx_type np = p.rows (); p = p.transpose (); double *pt_array = p.fortran_vec (); //double pt_array[dim * np]; //for (int i = 0; i < np; i++) // { // for (int j = 0; j < dim; j++) // { // pt_array[j+i*dim] = p(i,j); // } // } boolT ismalloc = false; OCTAVE_LOCAL_BUFFER (char, flags, 250); // hmm lot's of options for qhull here sprintf (flags, "qhull v Fv T0 %s", options); // If you want some debugging information replace the 0 pointer // with stdout or some other file open for writing. FILE *outfile = 0; FILE *errfile = stderr; if (! qh_new_qhull (dim, np, pt_array, ismalloc, flags, outfile, errfile)) { facetT *facet; vertexT *vertex; octave_idx_type i = 0, n = 1, k = 0, m = 0, fidx = 0, j = 0, r = 0; OCTAVE_LOCAL_BUFFER (octave_idx_type, ni, np); for (i = 0; i < np; i++) ni[i] = 0; qh_setvoronoi_all (); bool infinity_seen = false; facetT *neighbor, **neighborp; coordT *voronoi_vertex; FORALLfacets { facet->seen = false; } FORALLvertices { if (qh hull_dim == 3) qh_order_vertexneighbors (vertex); infinity_seen = false; FOREACHneighbor_ (vertex) { if (! neighbor->upperdelaunay) { if (! neighbor->seen) { n++; neighbor->seen = true; } ni[k]++; } else if (! infinity_seen) { infinity_seen = true; ni[k]++; } } k++; } Matrix v (n, dim); for (octave_idx_type d = 0; d < dim; d++) v(0,d) = octave_Inf; boolMatrix AtInf (np, 1); for (i = 0; i < np; i++) AtInf(i) = false; octave_value_list F (np, octave_value ()); k = 0; i = 0; FORALLfacets { facet->seen = false; } FORALLvertices { if (qh hull_dim == 3) qh_order_vertexneighbors(vertex); infinity_seen = false; RowVector facet_list (ni[k++]); m = 0; FOREACHneighbor_(vertex) { if (neighbor->upperdelaunay) { if (! infinity_seen) { infinity_seen = true; facet_list(m++) = 1; AtInf(j) = true; } } else { if (! neighbor->seen) { voronoi_vertex = neighbor->center; fidx = neighbor->id; i++; for (octave_idx_type d = 0; d < dim; d++) { v(i,d) = *(voronoi_vertex++); } neighbor->seen = true; neighbor->visitid = i; } facet_list(m++) = neighbor->visitid + 1; } } F(r++) = facet_list; j++; } Cell C(r, 1); for (i = 0; i < r; i++) C.elem (i) = F(i); retval(0) = v; retval(1) = C; AtInf.resize (r, 1); retval(2) = AtInf; // free long memory qh_freeqhull (! qh_ALL); // free short memory and memory allocator int curlong, totlong; qh_memfreeshort (&curlong, &totlong); if (curlong || totlong) warning ("__voronoi__: did not free %d bytes of long memory (%d pieces)", totlong, curlong); } else error ("__voronoi__: qhull failed"); #else error ("__voronoi__: not available in this version of Octave"); #endif return retval; }