ceph/src/boost/boost/geometry/srs/projections/proj/eck1.hpp

   1 // Boost.Geometry - gis-projections (based on PROJ4)
   2
   3 // Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
   4
   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.
   8
   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)
  12
  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
  17
  18 // Last updated version of proj: 5.0.0
  19
  20 // Original copyright notice:
  21
  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:
  28
  29 // The above copyright notice and this permission notice shall be included
  30 // in all copies or substantial portions of the Software.
  31
  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.
  39
  40 #ifndef BOOST_GEOMETRY_PROJECTIONS_ECK1_HPP
  41 #define BOOST_GEOMETRY_PROJECTIONS_ECK1_HPP
  42
  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/projects.hpp>
  46 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
  47
  48 namespace boost { namespace geometry
  49 {
  50
  51 namespace projections
  52 {
  53     #ifndef DOXYGEN_NO_DETAIL
  54     namespace detail { namespace eck1
  55     {
  56
  57             static const double FC = .92131773192356127802;
  58             static const double RP = .31830988618379067154;
  59
  60             template <typename T, typename Parameters>
  61             struct base_eck1_spheroid
  62             {
  63                 // FORWARD(s_forward)  spheroid
  64                 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
  65                 inline void fwd(Parameters const& , T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
  66                 {
  67                     xy_x = FC * lp_lon * (1. - RP * fabs(lp_lat));
  68                     xy_y = FC * lp_lat;
  69                 }
  70
  71                 // INVERSE(s_inverse)  spheroid
  72                 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
  73                 inline void inv(Parameters const& , T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
  74                 {
  75                     lp_lat = xy_y / FC;
  76                     lp_lon = xy_x / (FC * (1. - RP * fabs(lp_lat)));
  77                 }
  78
  79                 static inline std::string get_name()
  80                 {
  81                     return "eck1_spheroid";
  82                 }
  83
  84             };
  85
  86             // Eckert I
  87             template <typename Parameters>
  88             inline void setup_eck1(Parameters& par)
  89             {
  90                 par.es = 0.;
  91             }
  92
  93     }} // namespace detail::eck1
  94     #endif // doxygen
  95
  96     /*!
  97         \brief Eckert I projection
  98         \ingroup projections
  99         \tparam Geographic latlong point type
 100         \tparam Cartesian xy point type
 101         \tparam Parameters parameter type
 102         \par Projection characteristics
 103          - Pseudocylindrical
 104          - Spheroid
 105         \par Example
 106         \image html ex_eck1.gif
 107     */
 108     template <typename T, typename Parameters>
 109     struct eck1_spheroid : public detail::eck1::base_eck1_spheroid<T, Parameters>
 110     {
 111         template <typename Params>
 112         inline eck1_spheroid(Params const& , Parameters & par)
 113         {
 114             detail::eck1::setup_eck1(par);
 115         }
 116     };
 117
 118     #ifndef DOXYGEN_NO_DETAIL
 119     namespace detail
 120     {
 121
 122         // Static projection
 123         BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_eck1, eck1_spheroid)
 124
 125         // Factory entry(s)
 126         BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(eck1_entry, eck1_spheroid)
 127
 128         BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(eck1_init)
 129         {
 130             BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(eck1, eck1_entry);
 131         }
 132
 133     } // namespace detail
 134     #endif // doxygen
 135
 136 } // namespace projections
 137
 138 }} // namespace boost::geometry
 139
 140 #endif // BOOST_GEOMETRY_PROJECTIONS_ECK1_HPP
 141