mirror of https://github.com/CGAL/cgal
161 lines
4.2 KiB
C++
161 lines
4.2 KiB
C++
#ifndef CGAL_BOOST_GRAPH_INTERNAL_HELPERS_H
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#define CGAL_BOOST_GRAPH_INTERNAL_HELPERS_H
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#include <boost/graph/graph_traits.hpp>
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#include <boost/optional.hpp>
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#include <CGAL/boost/graph/iterator.h>
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namespace CGAL {
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// breaks a dependency loop between <CGAL/boost/graph/helpers.h>
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// and <CGAL/boost/graph/iterator.h>
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template <typename Graph> class Halfedge_around_target_iterator;
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namespace internal {
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template <typename Graph>
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void
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set_border(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, Graph& g)
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{
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set_face(h, boost::graph_traits<Graph>::null_face(), g);
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}
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template <typename Graph>
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typename boost::graph_traits<Graph>::halfedge_descriptor
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copy(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, Graph& g)
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{
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typename boost::graph_traits<Graph>::edge_descriptor e = add_edge(g);
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typename boost::graph_traits<Graph>::halfedge_descriptor res = halfedge(e,g);
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typename boost::graph_traits<Graph>::halfedge_descriptor ropp = opposite(res, g);
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typename boost::graph_traits<Graph>::halfedge_descriptor hopp = opposite(h, g);
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set_target(res, target(h, g), g);
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set_target(hopp, target(hopp, g), g);
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set_face(res, face(h, g), g);
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set_face(ropp, face(hopp, g), g);
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// note that we cannot call set_next as it then would call set_prev on the original
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return res;
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}
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template <typename Graph>
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void
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set_vertex_halfedge(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, Graph& g)
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{ set_halfedge(target(h, g), h, g); }
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template <typename Graph>
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void
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close_tip(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, Graph& g)
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{
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// makes `opposite(h,g)' the successor of h.
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set_next( h, opposite(h, g), g);
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}
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template <typename Graph>
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void
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close_tip(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, typename boost::graph_traits<Graph>::vertex_descriptor const& v
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, Graph& g)
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{
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// makes `h->opposite()' the successor of h and sets the incident
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// vertex of h to v.
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set_next(h, opposite(h, g), g);
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set_target(h, v, g);
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set_halfedge(v, h, g);
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}
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template <typename Graph>
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void
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insert_tip(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, typename boost::graph_traits<Graph>::halfedge_descriptor const& h2
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, Graph& g)
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{
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set_next(h, next(h2,g), g);
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set_next(h2, opposite(h, g), g);
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set_target(h, target(h2, g), g);
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}
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template <typename Graph>
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void
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remove_tip(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, Graph& g)
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{
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set_next(h, next(opposite(next(h, g), g), g), g);
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}
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template <typename Graph>
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void
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set_face_in_face_loop(typename boost::graph_traits<Graph>::halfedge_descriptor h,
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typename boost::graph_traits<Graph>::face_descriptor f,
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Graph& g)
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{
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typename boost::graph_traits<Graph>::halfedge_descriptor end = h;
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do {
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set_face(h, f, g);
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h = next(h, g);
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} while ( h != end);
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}
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template <typename Graph>
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void insert_halfedge(typename boost::graph_traits<Graph>::halfedge_descriptor const& h
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, typename boost::graph_traits<Graph>::halfedge_descriptor const& f
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, Graph& g)
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{
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set_next(h, next(f, g), g);
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set_next(f, h, g);
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set_face(h, face(f, g), g);
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}
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template <typename Graph>
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std::size_t
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exact_num_vertices(const Graph& g)
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{
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typename boost::graph_traits<Graph>::vertex_iterator beg, end;
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boost::tie(beg,end) = vertices(g);
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return std::distance(beg,end);
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}
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template <typename Graph>
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std::size_t
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exact_num_halfedges(const Graph& g)
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{
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typename boost::graph_traits<Graph>::halfedge_iterator beg, end;
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boost::tie(beg,end) = halfedges(g);
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return std::distance(beg,end);
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}
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template <typename Graph>
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std::size_t
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exact_num_edges(const Graph& g)
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{
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typename boost::graph_traits<Graph>::edge_iterator beg, end;
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boost::tie(beg,end) = edges(g);
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return std::distance(beg,end);
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}
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template <typename Graph>
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std::size_t
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exact_num_faces(const Graph& g)
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{
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typename boost::graph_traits<Graph>::face_iterator beg, end;
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boost::tie(beg,end) = faces(g);
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return std::distance(beg,end);
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}
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} // internal
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} // CGAL
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#endif // CGAL_BOOST_GRAPH_INTERNAL_HELPERS_H
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