Chris@102: // Boost.Geometry
Chris@102: 
Chris@102: // Copyright (c) 2014 Oracle and/or its affiliates.
Chris@102: 
Chris@102: // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
Chris@102: 
Chris@102: // Use, modification and distribution is subject to the Boost Software License,
Chris@102: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: 
Chris@102: #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP
Chris@102: #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP
Chris@102: 
Chris@102: #include <boost/geometry/core/radius.hpp>
Chris@102: #include <boost/geometry/core/tag.hpp>
Chris@102: #include <boost/geometry/core/tags.hpp>
Chris@102: 
Chris@102: #include <boost/geometry/algorithms/not_implemented.hpp>
Chris@102: 
Chris@102: namespace boost { namespace geometry
Chris@102: {
Chris@102: 
Chris@102: #ifndef DOXYGEN_NO_DISPATCH
Chris@102: namespace detail_dispatch
Chris@102: {
Chris@102: 
Chris@102: template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
Chris@102: struct flattening
Chris@102:     : not_implemented<Tag>
Chris@102: {};
Chris@102: 
Chris@102: template <typename ResultType, typename Geometry>
Chris@102: struct flattening<ResultType, Geometry, srs_sphere_tag>
Chris@102: {
Chris@102:     static inline ResultType apply(Geometry const& /*geometry*/)
Chris@102:     {
Chris@102:         return ResultType(0);
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template <typename ResultType, typename Geometry>
Chris@102: struct flattening<ResultType, Geometry, srs_spheroid_tag>
Chris@102: {
Chris@102:     static inline ResultType apply(Geometry const& geometry)
Chris@102:     {
Chris@102:         return ResultType(get_radius<0>(geometry) - get_radius<2>(geometry))
Chris@102:                     / ResultType(get_radius<0>(geometry));
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: } // namespace detail_dispatch
Chris@102: #endif // DOXYGEN_NO_DISPATCH
Chris@102: 
Chris@102: #ifndef DOXYGEN_NO_DETAIL
Chris@102: namespace detail
Chris@102: {
Chris@102: 
Chris@102: template <typename ResultType, typename Geometry>
Chris@102: ResultType flattening(Geometry const& geometry)
Chris@102: {
Chris@102:     return detail_dispatch::flattening<ResultType, Geometry>::apply(geometry);
Chris@102: }
Chris@102: 
Chris@102: } // namespace detail
Chris@102: #endif // DOXYGEN_NO_DETAIL
Chris@102: 
Chris@102: }} // namespace boost::geometry
Chris@102: 
Chris@102: #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP