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- #ifndef BOOST_GEOMETRY_PROJECTIONS_COLLG_HPP
- #define BOOST_GEOMETRY_PROJECTIONS_COLLG_HPP
- #include <boost/geometry/util/math.hpp>
- #include <boost/geometry/srs/projections/impl/base_static.hpp>
- #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
- #include <boost/geometry/srs/projections/impl/projects.hpp>
- #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
- namespace boost { namespace geometry
- {
- namespace projections
- {
- #ifndef DOXYGEN_NO_DETAIL
- namespace detail { namespace collg
- {
- static const double FXC = 1.12837916709551257390;
- static const double FYC = 1.77245385090551602729;
- static const double one_plus_eps = 1.0000001;
- template <typename T, typename Parameters>
- struct base_collg_spheroid
- {
-
-
- inline void fwd(Parameters const& , T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
- {
- if ((xy_y = 1. - sin(lp_lat)) <= 0.)
- xy_y = 0.;
- else
- xy_y = sqrt(xy_y);
- xy_x = FXC * lp_lon * xy_y;
- xy_y = FYC * (1. - xy_y);
- }
-
-
- inline void inv(Parameters const& , T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
- {
- static T const half_pi = detail::half_pi<T>();
- lp_lat = xy_y / FYC - 1.;
- if (fabs(lp_lat = 1. - lp_lat * lp_lat) < 1.)
- lp_lat = asin(lp_lat);
- else if (fabs(lp_lat) > one_plus_eps) {
- BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
- } else {
- lp_lat = lp_lat < 0. ? -half_pi : half_pi;
- }
- if ((lp_lon = 1. - sin(lp_lat)) <= 0.)
- lp_lon = 0.;
- else
- lp_lon = xy_x / (FXC * sqrt(lp_lon));
- }
- static inline std::string get_name()
- {
- return "collg_spheroid";
- }
- };
-
- template <typename Parameters>
- inline void setup_collg(Parameters& par)
- {
- par.es = 0.;
- }
- }}
- #endif
-
- template <typename T, typename Parameters>
- struct collg_spheroid : public detail::collg::base_collg_spheroid<T, Parameters>
- {
- template <typename Params>
- inline collg_spheroid(Params const& , Parameters & par)
- {
- detail::collg::setup_collg(par);
- }
- };
- #ifndef DOXYGEN_NO_DETAIL
- namespace detail
- {
-
- BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_collg, collg_spheroid)
-
- BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(collg_entry, collg_spheroid)
- BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(collg_init)
- {
- BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(collg, collg_entry);
- }
- }
- #endif
- }
- }}
- #endif
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