You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.9 KiB
58 lines
1.9 KiB
// 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 <boost/config/no_tr1/cmath.hpp> |
|
#include <boost/math/constants/constants.hpp> |
|
#include <utility> |
|
#include <boost/graph/graph_traits.hpp> |
|
#include <boost/graph/iteration_macros.hpp> |
|
#include <boost/graph/topology.hpp> |
|
#include <boost/static_assert.hpp> |
|
|
|
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<typename VertexListGraph, typename PositionMap, typename Radius> |
|
void |
|
circle_graph_layout(const VertexListGraph& g, PositionMap position, |
|
Radius radius) |
|
{ |
|
BOOST_STATIC_ASSERT (property_traits<PositionMap>::value_type::dimensions >= 2); |
|
const double pi = boost::math::constants::pi<double>(); |
|
|
|
#ifndef BOOST_NO_STDC_NAMESPACE |
|
using std::sin; |
|
using std::cos; |
|
#endif // BOOST_NO_STDC_NAMESPACE |
|
|
|
typedef typename graph_traits<VertexListGraph>::vertices_size_type |
|
vertices_size_type; |
|
|
|
vertices_size_type n = num_vertices(g); |
|
|
|
vertices_size_type i = 0; |
|
double two_pi_over_n = 2. * pi / n; |
|
BGL_FORALL_VERTICES_T(v, g, VertexListGraph) { |
|
position[v][0] = radius * cos(i * two_pi_over_n); |
|
position[v][1] = radius * sin(i * two_pi_over_n); |
|
++i; |
|
} |
|
} |
|
} // end namespace boost |
|
|
|
#endif // BOOST_GRAPH_CIRCLE_LAYOUT_HPP
|
|
|