// Boost.Geometry - gis-projections (based on PROJ4)
// Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2017, 2018, 2019.
// Modifications copyright (c) 2017-2019, 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: 5.0.0
// 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.
#ifndef BOOST_GEOMETRY_PROJECTIONS_HAMMER_HPP
#define BOOST_GEOMETRY_PROJECTIONS_HAMMER_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/factory_entry.hpp>
#include <boost/geometry/srs/projections/impl/pj_param.hpp>
#include <boost/geometry/srs/projections/impl/projects.hpp>
namespace boost { namespace geometry
{
namespace projections
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace hammer
{
static const double epsilon = 1.0e-10;
template <typename T>
struct par_hammer
{
T w;
T m, rm;
};
template <typename T, typename Parameters>
struct base_hammer_spheroid
{
par_hammer<T> m_proj_parm;
// FORWARD(s_forward) spheroid
// Project coordinates from geographic (lon, lat) to cartesian (x, y)
inline void fwd(Parameters const& , T lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
{
T cosphi, d;
d = sqrt(2./(1. + (cosphi = cos(lp_lat)) * cos(lp_lon *= this->m_proj_parm.w)));
xy_x = this->m_proj_parm.m * d * cosphi * sin(lp_lon);
xy_y = this->m_proj_parm.rm * d * sin(lp_lat);
}
// INVERSE(s_inverse) spheroid
// Project coordinates from cartesian (x, y) to geographic (lon, lat)
inline void inv(Parameters const& , T const& xy_x, T const& xy_y, T& lp_lon, T& lp_lat) const
{
T z;
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);
if (geometry::math::abs(2.*z*z-1.) < epsilon) {
lp_lon = HUGE_VAL;
lp_lat = HUGE_VAL;
BOOST_THROW_EXCEPTION( projection_exception(error_lat_or_lon_exceed_limit) );
} else {
lp_lon = aatan2(this->m_proj_parm.w * xy_x * z,2. * z * z - 1)/this->m_proj_parm.w;
lp_lat = aasin(z * xy_y);
}
}
static inline std::string get_name()
{
return "hammer_spheroid";
}
};
// Hammer & Eckert-Greifendorff
template <typename Params, typename Parameters, typename T>
inline void setup_hammer(Params const& params, Parameters& par, par_hammer<T>& proj_parm)
{
T tmp;
if (pj_param_f<srs::spar::w>(params, "W", srs::dpar::w, tmp)) {
if ((proj_parm.w = fabs(tmp)) <= 0.)
BOOST_THROW_EXCEPTION( projection_exception(error_w_or_m_zero_or_less) );
} else
proj_parm.w = .5;
if (pj_param_f<srs::spar::m>(params, "M", srs::dpar::m, tmp)) {
if ((proj_parm.m = fabs(tmp)) <= 0.)
BOOST_THROW_EXCEPTION( projection_exception(error_w_or_m_zero_or_less) );
} else
proj_parm.m = 1.;
proj_parm.rm = 1. / proj_parm.m;
proj_parm.m /= proj_parm.w;
par.es = 0.;
}
}} // namespace detail::hammer
#endif // doxygen
/*!
\brief Hammer & Eckert-Greifendorff projection
\ingroup projections
\tparam Geographic latlong point type
\tparam Cartesian xy point type
\tparam Parameters parameter type
\par Projection characteristics
- Miscellaneous
- Spheroid
- no inverse
\par Projection parameters
- W (real)
- M (real)
\par Example
\image html ex_hammer.gif
*/
template <typename T, typename Parameters>
struct hammer_spheroid : public detail::hammer::base_hammer_spheroid<T, Parameters>
{
template <typename Params>
inline hammer_spheroid(Params const& params, Parameters & par)
{
detail::hammer::setup_hammer(params, par, this->m_proj_parm);
}
};
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
// Static projection
BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_hammer, hammer_spheroid)
// Factory entry(s)
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(hammer_entry, hammer_spheroid)
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(hammer_init)
{
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(hammer, hammer_entry)
}
} // namespace detail
#endif // doxygen
} // namespace projections
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_PROJECTIONS_HAMMER_HPP