145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
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// Copyright (c) 2015 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0+
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//
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// Author(s) : Frank Da, David Cohen-Steiner, Andreas Fabri
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#ifndef CGAL_AFSR_ORIENT_H
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#define CGAL_AFSR_ORIENT_H
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#include <CGAL/license/Advancing_front_surface_reconstruction.h>
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namespace CGAL {
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namespace AFSR {
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template <class Triangulation, class TDS, class Filter>
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typename TDS::Vertex_handle
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orient(TDS& tds, const Advancing_front_surface_reconstruction<Triangulation,Filter>& surface)
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{
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typedef typename TDS::Vertex_handle Vertex_handle;
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typedef std::pair<Vertex_handle,Vertex_handle> Vh_pair;
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typedef typename TDS::Face_handle Face_handle;
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typedef typename TDS::Edge Edge;
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Triangulation& T = surface.triangulation_3();
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// create an infinite-vertex and infinite faces with the
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// boundary edges if any.
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// return the infinite vertex if created
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Vertex_handle vinf;
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std::vector<Vertex_handle > vvh;
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if(tds.number_of_vertices() != 0) tds.clear();
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int dim = 2;
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tds.set_dimension(dim);
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CGAL::Unique_hash_map<typename Triangulation::Vertex_handle, int> vertex_index_map(-1, T.number_of_vertices());
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int i=0;
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for (typename Triangulation::Finite_vertices_iterator v_it = T.finite_vertices_begin();
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v_it != T.finite_vertices_end();
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v_it++){
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typename CGAL::Unique_hash_map<typename Triangulation::Vertex_handle, int>::Data& d = vertex_index_map[v_it];
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if ((!v_it->is_exterior()) && d == -1){
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d = i;
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Vertex_handle vh = tds.create_vertex();
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vvh.push_back(vh);
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vh->set_point(v_it->point());
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i++;
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}
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}
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std::map<Vh_pair, Edge> edge_map;
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for(typename Triangulation::Finite_facets_iterator f_it = T.finite_facets_begin();
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f_it != T.finite_facets_end();
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f_it++)
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{
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typename Triangulation::Cell_handle n, c = (*f_it).first;
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int ni, ci = (*f_it).second;
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n = c->neighbor(ci);
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ni = n->index(c);
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int i1, i2 ,i3;
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if (c->is_selected_facet(ci))
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{
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i1 = (ci+1) & 3;
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i2 = (ci+2) & 3;
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i3 = (ci+3) & 3;
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Face_handle fh = tds.create_face(vvh[vertex_index_map[c->vertex(i1)]],
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vvh[vertex_index_map[c->vertex(i2)]],
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vvh[vertex_index_map[c->vertex(i3)]]);
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vvh[vertex_index_map[c->vertex(i1)]]->set_face(fh);
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vvh[vertex_index_map[c->vertex(i2)]]->set_face(fh);
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vvh[vertex_index_map[c->vertex(i3)]]->set_face(fh);
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for (int ih = 0; ih < 3; ++ih) {
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tds.set_adjacency(fh, ih, edge_map);
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}
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}
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if (n->is_selected_facet(ni))
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{
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i1 = (ni+1) & 3;
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i2 = (ni+2) & 3;
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i3 = (ni+3) & 3;
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Face_handle fh = tds.create_face(vvh[vertex_index_map[n->vertex(i1)]],
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vvh[vertex_index_map[n->vertex(i2)]],
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vvh[vertex_index_map[n->vertex(i3)]]);
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vvh[vertex_index_map[n->vertex(i1)]]->set_face(fh);
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vvh[vertex_index_map[n->vertex(i2)]]->set_face(fh);
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vvh[vertex_index_map[n->vertex(i3)]]->set_face(fh);
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for (int ih = 0; ih < 3; ++ih) {
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tds.set_adjacency(fh, ih, edge_map);
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}
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}
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}
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if ( !edge_map.empty()) {
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vinf = tds.create_vertex();
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std::map<Vh_pair, Edge> inf_edge_map;
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while (!edge_map.empty()) {
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Face_handle fh = edge_map.begin()->second.first;
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int ih = edge_map.begin()->second.second;
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Face_handle fn = tds.create_face( vinf,
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fh->vertex(TDS::cw(ih)),
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fh->vertex(TDS::ccw(ih)));
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vinf->set_face(fn);
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tds.set_adjacency(fn, 0, fh, ih);
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tds.set_adjacency(fn, 1, inf_edge_map);
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tds.set_adjacency(fn, 2, inf_edge_map);
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edge_map.erase(edge_map.begin());
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}
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CGAL_assertion(inf_edge_map.empty());
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}
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tds.reorient_faces();
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return vinf;
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}
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} // namespace AFSR
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} // namespace CGAL
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#endif //CGAL_AFSR_ORIENT_H
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