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// Boost.Geometry
// Copyright (c) 2014 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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_ALGORITHMS_DETAIL_FLATTENING_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP
#include <boost/geometry/core/radius.hpp>
#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/algorithms/not_implemented.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DISPATCH
namespace detail_dispatch
{
template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
struct flattening
: not_implemented<Tag>
{};
template <typename ResultType, typename Geometry>
struct flattening<ResultType, Geometry, srs_sphere_tag>
{
static inline ResultType apply(Geometry const& /*geometry*/)
{
return ResultType(0);
}
};
template <typename ResultType, typename Geometry>
struct flattening<ResultType, Geometry, srs_spheroid_tag>
{
static inline ResultType apply(Geometry const& geometry)
{
return ResultType(get_radius<0>(geometry) - get_radius<2>(geometry))
/ ResultType(get_radius<0>(geometry));
}
};
} // namespace detail_dispatch
#endif // DOXYGEN_NO_DISPATCH
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
template <typename ResultType, typename Geometry>
ResultType flattening(Geometry const& geometry)
{
return detail_dispatch::flattening<ResultType, Geometry>::apply(geometry);
}
} // namespace detail
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP