1 // Boost.Geometry - gis-projections (based on PROJ4)
3 // Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
5 // This file was modified by Oracle on 2017, 2018, 2019.
6 // Modifications copyright (c) 2017-2019, Oracle and/or its affiliates.
7 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle.
9 // Use, modification and distribution is subject to the Boost Software License,
10 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
11 // http://www.boost.org/LICENSE_1_0.txt)
13 // This file is converted from PROJ4, http://trac.osgeo.org/proj
14 // PROJ4 is originally written by Gerald Evenden (then of the USGS)
15 // PROJ4 is maintained by Frank Warmerdam
16 // PROJ4 is converted to Boost.Geometry by Barend Gehrels
18 // Last updated version of proj: 5.0.0
20 // Original copyright notice:
22 // Permission is hereby granted, free of charge, to any person obtaining a
23 // copy of this software and associated documentation files (the "Software"),
24 // to deal in the Software without restriction, including without limitation
25 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
26 // and/or sell copies of the Software, and to permit persons to whom the
27 // Software is furnished to do so, subject to the following conditions:
29 // The above copyright notice and this permission notice shall be included
30 // in all copies or substantial portions of the Software.
32 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
33 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
34 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
35 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
36 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
37 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
38 // DEALINGS IN THE SOFTWARE.
40 #ifndef BOOST_GEOMETRY_PROJECTIONS_HAMMER_HPP
41 #define BOOST_GEOMETRY_PROJECTIONS_HAMMER_HPP
43 #include <boost/geometry/srs/projections/impl/base_static.hpp>
44 #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
45 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
46 #include <boost/geometry/srs/projections/impl/pj_param.hpp>
47 #include <boost/geometry/srs/projections/impl/projects.hpp>
49 namespace boost { namespace geometry
54 #ifndef DOXYGEN_NO_DETAIL
55 namespace detail { namespace hammer
57 static const double epsilon = 1.0e-10;
66 template <typename T, typename Parameters>
67 struct base_hammer_spheroid
69 par_hammer<T> m_proj_parm;
71 // FORWARD(s_forward) spheroid
72 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
73 inline void fwd(Parameters const& , T lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
77 d = sqrt(2./(1. + (cosphi = cos(lp_lat)) * cos(lp_lon *= this->m_proj_parm.w)));
78 xy_x = this->m_proj_parm.m * d * cosphi * sin(lp_lon);
79 xy_y = this->m_proj_parm.rm * d * sin(lp_lat);
82 // INVERSE(s_inverse) spheroid
83 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
84 inline void inv(Parameters const& , T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
88 z = sqrt(1. - 0.25*this->m_proj_parm.w*this->m_proj_parm.w*xy_x*xy_x - 0.25*xy_y*xy_y);
89 if (geometry::math::abs(2.*z*z-1.) < epsilon) {
92 BOOST_THROW_EXCEPTION( projection_exception(error_lat_or_lon_exceed_limit) );
94 lp_lon = aatan2(this->m_proj_parm.w * xy_x * z,2. * z * z - 1)/this->m_proj_parm.w;
95 lp_lat = aasin(z * xy_y);
99 static inline std::string get_name()
101 return "hammer_spheroid";
106 // Hammer & Eckert-Greifendorff
107 template <typename Params, typename Parameters, typename T>
108 inline void setup_hammer(Params const& params, Parameters& par, par_hammer<T>& proj_parm)
112 if (pj_param_f<srs::spar::w>(params, "W", srs::dpar::w, tmp)) {
113 if ((proj_parm.w = fabs(tmp)) <= 0.)
114 BOOST_THROW_EXCEPTION( projection_exception(error_w_or_m_zero_or_less) );
117 if (pj_param_f<srs::spar::m>(params, "M", srs::dpar::m, tmp)) {
118 if ((proj_parm.m = fabs(tmp)) <= 0.)
119 BOOST_THROW_EXCEPTION( projection_exception(error_w_or_m_zero_or_less) );
123 proj_parm.rm = 1. / proj_parm.m;
124 proj_parm.m /= proj_parm.w;
129 }} // namespace detail::hammer
133 \brief Hammer & Eckert-Greifendorff projection
135 \tparam Geographic latlong point type
136 \tparam Cartesian xy point type
137 \tparam Parameters parameter type
138 \par Projection characteristics
142 \par Projection parameters
146 \image html ex_hammer.gif
148 template <typename T, typename Parameters>
149 struct hammer_spheroid : public detail::hammer::base_hammer_spheroid<T, Parameters>
151 template <typename Params>
152 inline hammer_spheroid(Params const& params, Parameters & par)
154 detail::hammer::setup_hammer(params, par, this->m_proj_parm);
158 #ifndef DOXYGEN_NO_DETAIL
163 BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_hammer, hammer_spheroid)
166 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(hammer_entry, hammer_spheroid)
168 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(hammer_init)
170 BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(hammer, hammer_entry)
173 } // namespace detail
176 } // namespace projections
178 }} // namespace boost::geometry
180 #endif // BOOST_GEOMETRY_PROJECTIONS_HAMMER_HPP