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+#ifndef BOOST_GEOMETRY_PROJECTIONS_ECK4_HPP
+#define BOOST_GEOMETRY_PROJECTIONS_ECK4_HPP
+
+// Boost.Geometry - extensions-gis-projections (based on PROJ4)
+// This file is automatically generated. DO NOT EDIT.
+
+// Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
+
+// This file was modified by Oracle on 2017.
+// Modifications copyright (c) 2017, 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)
+
+// This file is converted from PROJ4, http://trac.osgeo.org/proj
+// PROJ4 is originally written by Gerald Evenden (then of the USGS)
+// PROJ4 is maintained by Frank Warmerdam
+// PROJ4 is converted to Boost.Geometry by Barend Gehrels
+
+// Last updated version of proj: 4.9.1
+
+// Original copyright notice:
+
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#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>
+#include <boost/geometry/srs/projections/impl/aasincos.hpp>
+
+namespace boost { namespace geometry
+{
+
+namespace srs { namespace par4
+{
+ struct eck4 {};
+
+}} //namespace srs::par4
+
+namespace projections
+{
+ #ifndef DOXYGEN_NO_DETAIL
+ namespace detail { namespace eck4
+ {
+
+ static const double C_x = .42223820031577120149;
+ static const double C_y = 1.32650042817700232218;
+ static const double RC_y = .75386330736002178205;
+ static const double C_p = 3.57079632679489661922;
+ static const double RC_p = .28004957675577868795;
+ static const double EPS = 1e-7;
+ static const int NITER = 6;
+
+ // template class, using CRTP to implement forward/inverse
+ template <typename CalculationType, typename Parameters>
+ struct base_eck4_spheroid : public base_t_fi<base_eck4_spheroid<CalculationType, Parameters>,
+ CalculationType, Parameters>
+ {
+
+ typedef CalculationType geographic_type;
+ typedef CalculationType cartesian_type;
+
+
+ inline base_eck4_spheroid(const Parameters& par)
+ : base_t_fi<base_eck4_spheroid<CalculationType, Parameters>,
+ CalculationType, Parameters>(*this, par) {}
+
+ // FORWARD(s_forward) spheroid
+ // Project coordinates from geographic (lon, lat) to cartesian (x, y)
+ inline void fwd(geographic_type& lp_lon, geographic_type& lp_lat, cartesian_type& xy_x, cartesian_type& xy_y) const
+ {
+ CalculationType p, V, s, c;
+ int i;
+
+ p = C_p * sin(lp_lat);
+ V = lp_lat * lp_lat;
+ lp_lat *= 0.895168 + V * ( 0.0218849 + V * 0.00826809 );
+ for (i = NITER; i ; --i) {
+ c = cos(lp_lat);
+ s = sin(lp_lat);
+ lp_lat -= V = (lp_lat + s * (c + 2.) - p) /
+ (1. + c * (c + 2.) - s * s);
+ if (fabs(V) < EPS)
+ break;
+ }
+ if (!i) {
+ xy_x = C_x * lp_lon;
+ xy_y = lp_lat < 0. ? -C_y : C_y;
+ } else {
+ xy_x = C_x * lp_lon * (1. + cos(lp_lat));
+ xy_y = C_y * sin(lp_lat);
+ }
+ }
+
+ // INVERSE(s_inverse) spheroid
+ // Project coordinates from cartesian (x, y) to geographic (lon, lat)
+ inline void inv(cartesian_type& xy_x, cartesian_type& xy_y, geographic_type& lp_lon, geographic_type& lp_lat) const
+ {
+ CalculationType c;
+
+ lp_lat = aasin(xy_y / C_y);
+ lp_lon = xy_x / (C_x * (1. + (c = cos(lp_lat))));
+ lp_lat = aasin((lp_lat + sin(lp_lat) * (c + 2.)) / C_p);
+ }
+
+ static inline std::string get_name()
+ {
+ return "eck4_spheroid";
+ }
+
+ };
+
+ // Eckert IV
+ template <typename Parameters>
+ inline void setup_eck4(Parameters& par)
+ {
+ par.es = 0.;
+ }
+
+ }} // namespace detail::eck4
+ #endif // doxygen
+
+ /*!
+ \brief Eckert IV projection
+ \ingroup projections
+ \tparam Geographic latlong point type
+ \tparam Cartesian xy point type
+ \tparam Parameters parameter type
+ \par Projection characteristics
+ - Pseudocylindrical
+ - Spheroid
+ \par Example
+ \image html ex_eck4.gif
+ */
+ template <typename CalculationType, typename Parameters>
+ struct eck4_spheroid : public detail::eck4::base_eck4_spheroid<CalculationType, Parameters>
+ {
+ inline eck4_spheroid(const Parameters& par) : detail::eck4::base_eck4_spheroid<CalculationType, Parameters>(par)
+ {
+ detail::eck4::setup_eck4(this->m_par);
+ }
+ };
+
+ #ifndef DOXYGEN_NO_DETAIL
+ namespace detail
+ {
+
+ // Static projection
+ BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION(srs::par4::eck4, eck4_spheroid, eck4_spheroid)
+
+ // Factory entry(s)
+ template <typename CalculationType, typename Parameters>
+ class eck4_entry : public detail::factory_entry<CalculationType, Parameters>
+ {
+ public :
+ virtual base_v<CalculationType, Parameters>* create_new(const Parameters& par) const
+ {
+ return new base_v_fi<eck4_spheroid<CalculationType, Parameters>, CalculationType, Parameters>(par);
+ }
+ };
+
+ template <typename CalculationType, typename Parameters>
+ inline void eck4_init(detail::base_factory<CalculationType, Parameters>& factory)
+ {
+ factory.add_to_factory("eck4", new eck4_entry<CalculationType, Parameters>);
+ }
+
+ } // namespace detail
+ #endif // doxygen
+
+} // namespace projections
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_PROJECTIONS_ECK4_HPP
+