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circle_layout.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\graph\circle_layout.hpp
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// Copyright 2004 The Trustees of Indiana University. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // Authors: Douglas Gregor // Andrew Lumsdaine #ifndef BOOST_GRAPH_CIRCLE_LAYOUT_HPP #define BOOST_GRAPH_CIRCLE_LAYOUT_HPP #include
#include
#include
namespace boost { /** * \brief Layout the graph with the vertices at the points of a regular * n-polygon. * * The distance from the center of the polygon to each point is * determined by the @p radius parameter. The @p position parameter * must be an Lvalue Property Map whose value type is a class type * containing @c x and @c y members that will be set to the @c x and * @c y coordinates. */ template
void circle_graph_layout(const VertexListGraph& g, PositionMap position, Radius radius) { const double pi = 3.14159; #ifndef BOOST_NO_STDC_NAMESPACE using std::sin; using std::cos; #endif // BOOST_NO_STDC_NAMESPACE typedef typename graph_traits
::vertices_size_type vertices_size_type; vertices_size_type n = num_vertices(g); typedef typename graph_traits
::vertex_iterator vertex_iterator; vertices_size_type i = 0; for(std::pair
v = vertices(g); v.first != v.second; ++v.first, ++i) { position[*v.first].x = radius * cos(i * 2 * pi / n); position[*v.first].y = radius * sin(i * 2 * pi / n); } } } // end namespace boost #endif // BOOST_GRAPH_CIRCLE_LAYOUT_HPP
circle_layout.hpp
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