84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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// Copyright (c) 2017 GeometryFactory (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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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Triangulation_3/include/CGAL/link_to_face_graph.h $
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// $Id: link_to_face_graph.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Andreas Fabri
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//
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#ifndef CGAL_LINK_TO_FACE_GRAPH_H
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#define CGAL_LINK_TO_FACE_GRAPH_H
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#include <CGAL/license/Triangulation_3.h>
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#include <boost/unordered_map.hpp>
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#include <CGAL/array.h>
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#include <CGAL/boost/graph/Euler_operations.h>
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#include <CGAL/boost/graph/helpers.h>
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namespace CGAL {
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template<class Triangulation_3,class FG>
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typename boost::graph_traits<FG>::vertex_descriptor
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link_to_face_graph(const Triangulation_3& t,
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typename Triangulation_3::Vertex_handle vh,
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FG& fg,
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bool no_infinite_faces = true)
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{
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typedef typename Triangulation_3::Cell_handle Cell_handle;
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typedef typename Triangulation_3::Vertex_handle Vertex_handle;
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typedef typename boost::graph_traits<FG>::vertex_descriptor vertex_descriptor;
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clear(fg);
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vertex_descriptor inf;
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vertex_descriptor nullvertex = boost::graph_traits<FG>::null_vertex();
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fg.clear();
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typedef boost::unordered_map<Vertex_handle, vertex_descriptor> Vertex_map;
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Vertex_map vertex_map;
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std::vector<Cell_handle> cells;
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t.incident_cells(t.infinite_vertex(),std::back_inserter(cells));
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std::array<vertex_descriptor,3> face;
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typename boost::property_map<FG, CGAL::vertex_point_t>::type vpm
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= get(CGAL::vertex_point, fg);
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for(Cell_handle ch : cells){
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bool infinite_face = false;
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int vhi = ch->index(vh);
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for(int i=0; i<3; i++){
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int j = Triangulation_3::vertex_triple_index(vhi,i);
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Vertex_handle vhj = ch->vertex(j);
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if(no_infinite_faces && t.is_infinite(vhj)){
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infinite_face = true;
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} else {
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std::pair<typename Vertex_map::iterator,bool> res
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= vertex_map.insert(std::make_pair(vhj,nullvertex));
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if(res.second){
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res.first->second = add_vertex(fg);
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put(vpm, res.first->second, vhj->point());
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if(t.is_infinite(vhj)){
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inf = res.first->second;
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}
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}
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face[i] = res.first->second;
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}
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}
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if(! infinite_face){
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Euler::add_face(face,fg);
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}
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}
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return inf;
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}
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} //namespace CGAL
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#endif //CGAL_LINK_TO_FACE_GRAPH_H
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