280 lines
9.6 KiB
C++
280 lines
9.6 KiB
C++
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//=======================================================================
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// Copyright (c) Aaron Windsor 2007
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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 __CHROBAK_PAYNE_DRAWING_HPP__
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#define __CHROBAK_PAYNE_DRAWING_HPP__
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#include <vector>
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#include <list>
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#include <stack>
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#include <boost/config.hpp>
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#include <boost/graph/graph_traits.hpp>
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#include <boost/property_map/property_map.hpp>
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namespace boost
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{
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namespace graph { namespace detail
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{
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template<typename Graph,
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typename VertexToVertexMap,
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typename VertexTo1DCoordMap>
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void accumulate_offsets(typename graph_traits<Graph>::vertex_descriptor v,
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std::size_t offset,
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const Graph& g,
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VertexTo1DCoordMap x,
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VertexTo1DCoordMap delta_x,
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VertexToVertexMap left,
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VertexToVertexMap right)
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_descriptor;
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// Suggestion of explicit stack from Aaron Windsor to avoid system stack
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// overflows.
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typedef std::pair<vertex_descriptor, std::size_t> stack_entry;
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std::stack<stack_entry> st;
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st.push(stack_entry(v, offset));
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while (!st.empty()) {
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vertex_descriptor v = st.top().first;
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std::size_t offset = st.top().second;
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st.pop();
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if (v != graph_traits<Graph>::null_vertex()) {
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x[v] += delta_x[v] + offset;
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st.push(stack_entry(left[v], x[v]));
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st.push(stack_entry(right[v], x[v]));
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}
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}
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}
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} /*namespace detail*/ } /*namespace graph*/
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template<typename Graph,
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typename PlanarEmbedding,
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typename ForwardIterator,
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typename GridPositionMap,
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typename VertexIndexMap>
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void chrobak_payne_straight_line_drawing(const Graph& g,
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PlanarEmbedding embedding,
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ForwardIterator ordering_begin,
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ForwardIterator ordering_end,
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GridPositionMap drawing,
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VertexIndexMap vm
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)
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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>::vertex_iterator vertex_iterator_t;
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typedef typename PlanarEmbedding::value_type::const_iterator
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edge_permutation_iterator_t;
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typedef typename graph_traits<Graph>::vertices_size_type v_size_t;
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typedef std::vector<vertex_t> vertex_vector_t;
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typedef std::vector<v_size_t> vsize_vector_t;
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typedef std::vector<bool> bool_vector_t;
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typedef boost::iterator_property_map
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<typename vertex_vector_t::iterator, VertexIndexMap>
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vertex_to_vertex_map_t;
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typedef boost::iterator_property_map
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<typename vsize_vector_t::iterator, VertexIndexMap>
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vertex_to_vsize_map_t;
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typedef boost::iterator_property_map
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<typename bool_vector_t::iterator, VertexIndexMap>
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vertex_to_bool_map_t;
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vertex_vector_t left_vector(num_vertices(g),
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graph_traits<Graph>::null_vertex()
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);
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vertex_vector_t right_vector(num_vertices(g),
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graph_traits<Graph>::null_vertex()
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);
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vsize_vector_t seen_as_right_vector(num_vertices(g), 0);
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vsize_vector_t seen_vector(num_vertices(g), 0);
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vsize_vector_t delta_x_vector(num_vertices(g),0);
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vsize_vector_t y_vector(num_vertices(g));
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vsize_vector_t x_vector(num_vertices(g),0);
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bool_vector_t installed_vector(num_vertices(g),false);
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vertex_to_vertex_map_t left(left_vector.begin(), vm);
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vertex_to_vertex_map_t right(right_vector.begin(), vm);
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vertex_to_vsize_map_t seen_as_right(seen_as_right_vector.begin(), vm);
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vertex_to_vsize_map_t seen(seen_vector.begin(), vm);
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vertex_to_vsize_map_t delta_x(delta_x_vector.begin(), vm);
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vertex_to_vsize_map_t y(y_vector.begin(), vm);
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vertex_to_vsize_map_t x(x_vector.begin(), vm);
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vertex_to_bool_map_t installed(installed_vector.begin(), vm);
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v_size_t timestamp = 1;
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vertex_vector_t installed_neighbors;
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ForwardIterator itr = ordering_begin;
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vertex_t v1 = *itr; ++itr;
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vertex_t v2 = *itr; ++itr;
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vertex_t v3 = *itr; ++itr;
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delta_x[v2] = 1;
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delta_x[v3] = 1;
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y[v1] = 0;
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y[v2] = 0;
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y[v3] = 1;
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right[v1] = v3;
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right[v3] = v2;
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installed[v1] = installed[v2] = installed[v3] = true;
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for(ForwardIterator itr_end = ordering_end; itr != itr_end; ++itr)
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{
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vertex_t v = *itr;
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// First, find the leftmost and rightmost neighbor of v on the outer
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// cycle of the embedding.
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// Note: since we're moving clockwise through the edges adjacent to v,
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// we're actually moving from right to left among v's neighbors on the
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// outer face (since v will be installed above them all) looking for
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// the leftmost and rightmost installed neigbhors
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vertex_t leftmost = graph_traits<Graph>::null_vertex();
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vertex_t rightmost = graph_traits<Graph>::null_vertex();
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installed_neighbors.clear();
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vertex_t prev_vertex = graph_traits<Graph>::null_vertex();
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edge_permutation_iterator_t pi, pi_end;
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pi_end = embedding[v].end();
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for(pi = embedding[v].begin(); pi != pi_end; ++pi)
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{
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vertex_t curr_vertex = source(*pi,g) == v ?
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target(*pi,g) : source(*pi,g);
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// Skip any self-loops or parallel edges
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if (curr_vertex == v || curr_vertex == prev_vertex)
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continue;
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if (installed[curr_vertex])
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{
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seen[curr_vertex] = timestamp;
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if (right[curr_vertex] != graph_traits<Graph>::null_vertex())
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{
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seen_as_right[right[curr_vertex]] = timestamp;
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}
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installed_neighbors.push_back(curr_vertex);
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}
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prev_vertex = curr_vertex;
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}
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typename vertex_vector_t::iterator vi, vi_end;
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vi_end = installed_neighbors.end();
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for(vi = installed_neighbors.begin(); vi != vi_end; ++vi)
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{
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if (right[*vi] == graph_traits<Graph>::null_vertex() ||
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seen[right[*vi]] != timestamp
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)
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rightmost = *vi;
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if (seen_as_right[*vi] != timestamp)
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leftmost = *vi;
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}
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++timestamp;
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//stretch gaps
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++delta_x[right[leftmost]];
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++delta_x[rightmost];
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//adjust offsets
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std::size_t delta_p_q = 0;
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vertex_t stopping_vertex = right[rightmost];
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for(vertex_t temp = right[leftmost]; temp != stopping_vertex;
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temp = right[temp]
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)
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{
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delta_p_q += delta_x[temp];
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}
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delta_x[v] = ((y[rightmost] + delta_p_q) - y[leftmost])/2;
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y[v] = y[leftmost] + delta_x[v];
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delta_x[rightmost] = delta_p_q - delta_x[v];
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bool leftmost_and_rightmost_adjacent = right[leftmost] == rightmost;
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if (!leftmost_and_rightmost_adjacent)
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delta_x[right[leftmost]] -= delta_x[v];
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//install v
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if (!leftmost_and_rightmost_adjacent)
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{
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left[v] = right[leftmost];
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vertex_t next_to_rightmost;
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for(vertex_t temp = leftmost; temp != rightmost;
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temp = right[temp]
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)
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{
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next_to_rightmost = temp;
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}
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right[next_to_rightmost] = graph_traits<Graph>::null_vertex();
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}
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else
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{
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left[v] = graph_traits<Graph>::null_vertex();
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}
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right[leftmost] = v;
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right[v] = rightmost;
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installed[v] = true;
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}
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graph::detail::accumulate_offsets
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(*ordering_begin,0,g,x,delta_x,left,right);
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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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{
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vertex_t v(*vi);
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drawing[v].x = x[v];
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drawing[v].y = y[v];
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}
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}
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template<typename Graph,
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typename PlanarEmbedding,
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typename ForwardIterator,
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typename GridPositionMap>
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inline void chrobak_payne_straight_line_drawing(const Graph& g,
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PlanarEmbedding embedding,
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ForwardIterator ord_begin,
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ForwardIterator ord_end,
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GridPositionMap drawing
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)
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{
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chrobak_payne_straight_line_drawing(g,
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embedding,
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ord_begin,
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ord_end,
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drawing,
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get(vertex_index,g)
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);
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}
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} // namespace boost
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#endif //__CHROBAK_PAYNE_DRAWING_HPP__
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