276 lines
8.5 KiB
C++
276 lines
8.5 KiB
C++
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//=======================================================================
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// Copyright 2007 Aaron Windsor
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//=======================================================================
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#ifndef __MAKE_MAXIMAL_PLANAR_HPP__
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#define __MAKE_MAXIMAL_PLANAR_HPP__
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#include <boost/config.hpp>
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#include <boost/tuple/tuple.hpp> //for tie
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#include <boost/graph/biconnected_components.hpp>
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#include <boost/property_map/property_map.hpp>
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#include <vector>
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#include <iterator>
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#include <algorithm>
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#include <boost/graph/planar_face_traversal.hpp>
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#include <boost/graph/planar_detail/add_edge_visitors.hpp>
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namespace boost
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{
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template <typename Graph, typename VertexIndexMap, typename AddEdgeVisitor>
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struct triangulation_visitor : public planar_face_traversal_visitor
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
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typedef typename graph_traits<Graph>::edge_descriptor edge_t;
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typedef typename graph_traits<Graph>::vertices_size_type v_size_t;
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typedef typename graph_traits<Graph>::degree_size_type degree_size_t;
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typedef typename graph_traits<Graph>::edge_iterator edge_iterator_t;
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typedef typename graph_traits<Graph>::vertex_iterator vertex_iterator_t;
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typedef typename graph_traits<Graph>::adjacency_iterator
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adjacency_iterator_t;
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typedef typename std::vector<vertex_t> vertex_vector_t;
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typedef typename std::vector<v_size_t> v_size_vector_t;
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typedef typename std::vector<degree_size_t> degree_size_vector_t;
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typedef iterator_property_map
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< typename v_size_vector_t::iterator, VertexIndexMap >
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vertex_to_v_size_map_t;
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typedef iterator_property_map
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< typename degree_size_vector_t::iterator, VertexIndexMap >
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vertex_to_degree_size_map_t;
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typedef typename vertex_vector_t::iterator face_iterator;
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triangulation_visitor(Graph& arg_g,
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VertexIndexMap arg_vm,
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AddEdgeVisitor arg_add_edge_visitor
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) :
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g(arg_g),
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vm(arg_vm),
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add_edge_visitor(arg_add_edge_visitor),
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timestamp(0),
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marked_vector(num_vertices(g), timestamp),
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degree_vector(num_vertices(g), 0),
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marked(marked_vector.begin(), vm),
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degree(degree_vector.begin(), vm)
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{
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vertex_iterator_t vi, vi_end;
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for(boost::tie(vi,vi_end) = vertices(g); vi != vi_end; ++vi)
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put(degree, *vi, out_degree(*vi, g));
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}
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template <typename Vertex>
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void next_vertex(Vertex v)
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{
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// Self-loops will appear as consecutive vertices in the list of
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// vertices on a face. We want to skip these.
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if (!vertices_on_face.empty() &&
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(vertices_on_face.back() == v || vertices_on_face.front() == v)
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)
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return;
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vertices_on_face.push_back(v);
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}
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void end_face()
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{
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++timestamp;
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if (vertices_on_face.size() <= 3)
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{
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// At most three vertices on this face - don't need to triangulate
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vertices_on_face.clear();
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return;
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}
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// Find vertex on face of minimum degree
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degree_size_t min_degree = num_vertices(g);
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typename vertex_vector_t::iterator min_degree_vertex_itr;
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face_iterator fi_end = vertices_on_face.end();
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for(face_iterator fi = vertices_on_face.begin(); fi != fi_end; ++fi)
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{
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degree_size_t deg = get(degree,*fi);
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if (deg < min_degree)
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{
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min_degree_vertex_itr = fi;
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min_degree = deg;
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}
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}
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// To simplify some of the manipulations, we'll re-arrange
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// vertices_on_face so that it still contains the same
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// (counter-clockwise) order of the vertices on this face, but now the
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// min_degree_vertex is the first element in vertices_on_face.
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vertex_vector_t temp_vector;
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std::copy(min_degree_vertex_itr, vertices_on_face.end(),
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std::back_inserter(temp_vector));
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std::copy(vertices_on_face.begin(), min_degree_vertex_itr,
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std::back_inserter(temp_vector));
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vertices_on_face.swap(temp_vector);
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// Mark all of the min degree vertex's neighbors
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adjacency_iterator_t ai, ai_end;
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for(boost::tie(ai,ai_end) = adjacent_vertices(vertices_on_face.front(),g);
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ai != ai_end; ++ai
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)
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{
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put(marked, *ai, timestamp);
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}
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typename vertex_vector_t::iterator marked_neighbor
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= vertices_on_face.end();
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// The iterator manipulations on the next two lines are safe because
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// vertices_on_face.size() > 3 (from the first test in this function)
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fi_end = prior(vertices_on_face.end());
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for(face_iterator fi = boost::next(boost::next(vertices_on_face.begin()));
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fi != fi_end; ++fi
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)
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{
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if (get(marked, *fi) == timestamp)
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{
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marked_neighbor = fi;
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break;
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}
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}
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if (marked_neighbor == vertices_on_face.end())
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{
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add_edge_range(
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vertices_on_face[0],
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boost::next(boost::next(vertices_on_face.begin())),
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prior(vertices_on_face.end())
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);
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}
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else
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{
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add_edge_range(
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vertices_on_face[1],
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boost::next(marked_neighbor),
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vertices_on_face.end()
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);
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add_edge_range(
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*boost::next(marked_neighbor),
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boost::next(boost::next(vertices_on_face.begin())),
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marked_neighbor
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);
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}
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//reset for the next face
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vertices_on_face.clear();
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}
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private:
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void add_edge_range(vertex_t anchor,
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face_iterator fi,
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face_iterator fi_end
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)
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{
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for (; fi != fi_end; ++fi)
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{
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vertex_t v(*fi);
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add_edge_visitor.visit_vertex_pair(anchor, v, g);
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put(degree, anchor, get(degree, anchor) + 1);
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put(degree, v, get(degree, v) + 1);
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}
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}
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Graph& g;
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VertexIndexMap vm;
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AddEdgeVisitor add_edge_visitor;
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v_size_t timestamp;
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vertex_vector_t vertices_on_face;
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v_size_vector_t marked_vector;
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degree_size_vector_t degree_vector;
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vertex_to_v_size_map_t marked;
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vertex_to_degree_size_map_t degree;
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};
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template <typename Graph,
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typename PlanarEmbedding,
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typename VertexIndexMap,
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typename EdgeIndexMap,
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typename AddEdgeVisitor
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>
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void make_maximal_planar(Graph& g,
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PlanarEmbedding embedding,
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VertexIndexMap vm,
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EdgeIndexMap em,
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AddEdgeVisitor& vis)
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{
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triangulation_visitor<Graph,VertexIndexMap,AddEdgeVisitor>
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visitor(g, vm, vis);
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planar_face_traversal(g, embedding, visitor, em);
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}
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template <typename Graph,
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typename PlanarEmbedding,
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typename VertexIndexMap,
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typename EdgeIndexMap
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>
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void make_maximal_planar(Graph& g,
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PlanarEmbedding embedding,
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VertexIndexMap vm,
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EdgeIndexMap em
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)
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{
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default_add_edge_visitor vis;
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make_maximal_planar(g, embedding, vm, em, vis);
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}
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template <typename Graph,
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typename PlanarEmbedding,
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typename VertexIndexMap
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>
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void make_maximal_planar(Graph& g,
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PlanarEmbedding embedding,
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VertexIndexMap vm
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)
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{
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make_maximal_planar(g, embedding, vm, get(edge_index,g));
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}
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template <typename Graph,
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typename PlanarEmbedding
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>
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void make_maximal_planar(Graph& g,
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PlanarEmbedding embedding
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)
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{
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make_maximal_planar(g, embedding, get(vertex_index,g));
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}
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} // namespace boost
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#endif //__MAKE_MAXIMAL_PLANAR_HPP__
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