projections/proj/gall.hpp

0001 // Boost.Geometry - gis-projections (based on PROJ4)
0002
0003 // Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
0004
0005 // This file was modified by Oracle on 2017, 2018, 2019.
0006 // Modifications copyright (c) 2017-2019, Oracle and/or its affiliates.
0007 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle.
0008
0009 // Use, modification and distribution is subject to the Boost Software License,
0010 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0011 // http://www.boost.org/LICENSE_1_0.txt)
0012
0013 // This file is converted from PROJ4, http://trac.osgeo.org/proj
0014 // PROJ4 is originally written by Gerald Evenden (then of the USGS)
0015 // PROJ4 is maintained by Frank Warmerdam
0016 // PROJ4 is converted to Boost.Geometry by Barend Gehrels
0017
0018 // Last updated version of proj: 5.0.0
0019
0020 // Original copyright notice:
0021
0022 // Permission is hereby granted, free of charge, to any person obtaining a
0023 // copy of this software and associated documentation files (the "Software"),
0024 // to deal in the Software without restriction, including without limitation
0025 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
0026 // and/or sell copies of the Software, and to permit persons to whom the
0027 // Software is furnished to do so, subject to the following conditions:
0028
0029 // The above copyright notice and this permission notice shall be included
0030 // in all copies or substantial portions of the Software.
0031
0032 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
0033 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0034 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
0035 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0036 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
0037 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
0038 // DEALINGS IN THE SOFTWARE.
0039
0040 #ifndef BOOST_GEOMETRY_PROJECTIONS_GALL_HPP
0041 #define BOOST_GEOMETRY_PROJECTIONS_GALL_HPP
0042
0043 #include <boost/geometry/srs/projections/impl/base_static.hpp>
0044 #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
0045 #include <boost/geometry/srs/projections/impl/projects.hpp>
0046 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
0047
0048 namespace boost { namespace geometry
0049 {
0050
0051 namespace projections
0052 {
0053     #ifndef DOXYGEN_NO_DETAIL
0054     namespace detail { namespace gall
0055     {
0056
0057             static const double YF = 1.70710678118654752440;
0058             static const double XF = 0.70710678118654752440;
0059             static const double RYF = 0.58578643762690495119;
0060             static const double RXF = 1.41421356237309504880;
0061
0062             template <typename T, typename Parameters>
0063             struct base_gall_spheroid
0064             {
0065                 // FORWARD(s_forward)  spheroid
0066                 // Project coordinates from geographic (lon, lat) to cartesian (x, y)
0067                 inline void fwd(Parameters const& , T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
0068                 {
0069                     xy_x = XF * lp_lon;
0070                     xy_y = YF * tan(.5 * lp_lat);
0071                 }
0072
0073                 // INVERSE(s_inverse)  spheroid
0074                 // Project coordinates from cartesian (x, y) to geographic (lon, lat)
0075                 inline void inv(Parameters const& , T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
0076                 {
0077                     lp_lon = RXF * xy_x;
0078                     lp_lat = 2. * atan(xy_y * RYF);
0079                 }
0080
0081                 static inline std::string get_name()
0082                 {
0083                     return "gall_spheroid";
0084                 }
0085
0086             };
0087
0088             // Gall (Gall Stereographic)
0089             template <typename Parameters>
0090             inline void setup_gall(Parameters& par)
0091             {
0092                 par.es = 0.0;
0093             }
0094
0095     }} // namespace detail::gall
0096     #endif // doxygen
0097
0098     /*!
0099         \brief Gall (Gall Stereographic) projection
0100         \ingroup projections
0101         \tparam Geographic latlong point type
0102         \tparam Cartesian xy point type
0103         \tparam Parameters parameter type
0104         \par Projection characteristics
0105          - Cylindrical
0106          - Spheroid
0107         \par Example
0108         \image html ex_gall.gif
0109     */
0110     template <typename T, typename Parameters>
0111     struct gall_spheroid : public detail::gall::base_gall_spheroid<T, Parameters>
0112     {
0113         template <typename Params>
0114         inline gall_spheroid(Params const& , Parameters & par)
0115         {
0116             detail::gall::setup_gall(par);
0117         }
0118     };
0119
0120     #ifndef DOXYGEN_NO_DETAIL
0121     namespace detail
0122     {
0123
0124         // Static projection
0125         BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_gall, gall_spheroid)
0126
0127         // Factory entry(s)
0128         BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(gall_entry, gall_spheroid)
0129
0130         BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(gall_init)
0131         {
0132             BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(gall, gall_entry);
0133         }
0134
0135     } // namespace detail
0136     #endif // doxygen
0137
0138 } // namespace projections
0139
0140 }} // namespace boost::geometry
0141
0142 #endif // BOOST_GEOMETRY_PROJECTIONS_GALL_HPP
0143