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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
// This file was modified by Oracle on 2014.
// Modifications copyright (c) 2014 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
// Use, modification and distribution is subject to 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)
#ifndef BOOST_GEOMETRY_CORE_RADIUS_HPP
#define BOOST_GEOMETRY_CORE_RADIUS_HPP
#include <cstddef>
#include <boost/static_assert.hpp>
#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/util/bare_type.hpp>
namespace boost { namespace geometry
{
namespace traits
{
/*!
\brief Traits class to get/set radius of a circle/sphere/(ellipse)
\details the radius access meta-functions give read/write access to the radius of a circle or a sphere,
or to the major/minor axis or an ellipse, or to one of the 3 equatorial radii of an ellipsoid.
It should be specialized per geometry, in namespace core_dispatch. Those specializations should
forward the call via traits to the geometry class, which could be specified by the user.
There is a corresponding generic radius_get and radius_set function
\par Geometries:
- n-sphere (circle,sphere)
- upcoming ellipse
\par Specializations should provide:
- inline static T get(Geometry const& geometry)
- inline static void set(Geometry& geometry, T const& radius)
\ingroup traits
*/
template <typename Geometry, std::size_t Dimension>
struct radius_access {};
/*!
\brief Traits class indicating the type (double,float,...) of the radius of a circle or a sphere
\par Geometries:
- n-sphere (circle,sphere)
- upcoming ellipse
\par Specializations should provide:
- typedef T type (double,float,int,etc)
\ingroup traits
*/
template <typename Geometry>
struct radius_type {};
} // namespace traits
#ifndef DOXYGEN_NO_DISPATCH
namespace core_dispatch
{
template <typename Tag, typename Geometry>
struct radius_type
{
//typedef core_dispatch_specialization_required type;
};
/*!
\brief radius access meta-functions, used by concept n-sphere and upcoming ellipse.
*/
template <typename Tag,
typename Geometry,
std::size_t Dimension,
typename IsPointer>
struct radius_access
{
//static inline CoordinateType get(Geometry const& ) {}
//static inline void set(Geometry& g, CoordinateType const& value) {}
};
} // namespace core_dispatch
#endif // DOXYGEN_NO_DISPATCH
/*!
\brief Metafunction to get the type of radius of a circle / sphere / ellipse / etc.
\ingroup access
\tparam Geometry the type of geometry
*/
template <typename Geometry>
struct radius_type
{
typedef typename core_dispatch::radius_type
<
typename tag<Geometry>::type,
typename util::bare_type<Geometry>::type
>::type type;
};
/*!
\brief Function to get radius of a circle / sphere / ellipse / etc.
\return radius The radius for a given axis
\ingroup access
\param geometry the geometry to get the radius from
\tparam I index of the axis
*/
template <std::size_t I, typename Geometry>
inline typename radius_type<Geometry>::type get_radius(Geometry const& geometry)
{
return core_dispatch::radius_access
<
typename tag<Geometry>::type,
typename util::bare_type<Geometry>::type,
I,
typename boost::is_pointer<Geometry>::type
>::get(geometry);
}
/*!
\brief Function to set the radius of a circle / sphere / ellipse / etc.
\ingroup access
\tparam I index of the axis
\param geometry the geometry to change
\param radius the radius to set
*/
template <std::size_t I, typename Geometry>
inline void set_radius(Geometry& geometry,
typename radius_type<Geometry>::type const& radius)
{
core_dispatch::radius_access
<
typename tag<Geometry>::type,
typename util::bare_type<Geometry>::type,
I,
typename boost::is_pointer<Geometry>::type
>::set(geometry, radius);
}
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
template <typename Tag, typename Geometry, std::size_t Dimension>
struct radius_access
{
static inline typename radius_type<Geometry>::type get(Geometry const& geometry)
{
return traits::radius_access<Geometry, Dimension>::get(geometry);
}
static inline void set(Geometry& geometry,
typename radius_type<Geometry>::type const& value)
{
traits::radius_access<Geometry, Dimension>::set(geometry, value);
}
};
} // namespace detail
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace core_dispatch
{
template <typename Tag,
typename Geometry,
std::size_t Dimension>
struct radius_access<Tag, Geometry, Dimension, boost::true_type>
{
typedef typename geometry::radius_type<Geometry>::type radius_type;
static inline radius_type get(const Geometry * geometry)
{
return radius_access
<
Tag,
Geometry,
Dimension,
typename boost::is_pointer<Geometry>::type
>::get(*geometry);
}
static inline void set(Geometry * geometry, radius_type const& value)
{
return radius_access
<
Tag,
Geometry,
Dimension,
typename boost::is_pointer<Geometry>::type
>::set(*geometry, value);
}
};
template <typename Geometry>
struct radius_type<srs_sphere_tag, Geometry>
{
typedef typename traits::radius_type<Geometry>::type type;
};
template <typename Geometry, std::size_t Dimension>
struct radius_access<srs_sphere_tag, Geometry, Dimension, boost::false_type>
: detail::radius_access<srs_sphere_tag, Geometry, Dimension>
{
BOOST_STATIC_ASSERT(Dimension == 0);
//BOOST_STATIC_ASSERT(Dimension < 3);
};
template <typename Geometry>
struct radius_type<srs_spheroid_tag, Geometry>
{
typedef typename traits::radius_type<Geometry>::type type;
};
template <typename Geometry, std::size_t Dimension>
struct radius_access<srs_spheroid_tag, Geometry, Dimension, boost::false_type>
: detail::radius_access<srs_spheroid_tag, Geometry, Dimension>
{
BOOST_STATIC_ASSERT(Dimension == 0 || Dimension == 2);
//BOOST_STATIC_ASSERT(Dimension < 3);
};
} // namespace core_dispatch
#endif // DOXYGEN_NO_DISPATCH
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_CORE_RADIUS_HPP
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