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// Copyright 2004 The Trustees of Indiana University.
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// Distributed under the Boost Software License, Version 1.0.
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// (See 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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// Authors: Douglas Gregor
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// Andrew Lumsdaine
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#ifndef BOOST_GRAPH_CIRCLE_LAYOUT_HPP
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#define BOOST_GRAPH_CIRCLE_LAYOUT_HPP
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#include <cmath>
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#include <utility>
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#include <boost/graph/graph_traits.hpp>
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namespace boost {
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/**
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* \brief Layout the graph with the vertices at the points of a regular
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* n-polygon.
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*
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* The distance from the center of the polygon to each point is
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* determined by the @p radius parameter. The @p position parameter
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* must be an Lvalue Property Map whose value type is a class type
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* containing @c x and @c y members that will be set to the @c x and
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* @c y coordinates.
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*/
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template<typename VertexListGraph, typename PositionMap, typename Radius>
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void
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circle_graph_layout(const VertexListGraph& g, PositionMap position,
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Radius radius)
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{
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const double pi = 3.14159;
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#ifndef BOOST_NO_STDC_NAMESPACE
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using std::sin;
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using std::cos;
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#endif // BOOST_NO_STDC_NAMESPACE
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typedef typename graph_traits<VertexListGraph>::vertices_size_type
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vertices_size_type;
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vertices_size_type n = num_vertices(g);
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typedef typename graph_traits<VertexListGraph>::vertex_iterator
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vertex_iterator;
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vertices_size_type i = 0;
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for(std::pair<vertex_iterator, vertex_iterator> v = vertices(g);
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v.first != v.second; ++v.first, ++i) {
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position[*v.first].x = radius * cos(i * 2 * pi / n);
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position[*v.first].y = radius * sin(i * 2 * pi / n);
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}
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}
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} // end namespace boost
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#endif // BOOST_GRAPH_CIRCLE_LAYOUT_HPP
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