// 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
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// DEALINGS IN THE SOFTWARE.
#ifndef BOOST_GEOMETRY_PROJECTIONS_BIPC_HPP
#define BOOST_GEOMETRY_PROJECTIONS_BIPC_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>
#include <boost/geometry/util/math.hpp>
#include <boost/math/special_functions/hypot.hpp>
namespace boost { namespace geometry
{
namespace projections
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace bipc
{
static const double epsilon = 1e-10;
static const double epsilon10 = 1e-10;
static const double one_plus_eps = 1.000000001;
static const int n_iter = 10;
static const double lamB = -.34894976726250681539;
static const double n = .63055844881274687180;
static const double F = 1.89724742567461030582;
static const double Azab = .81650043674686363166;
static const double Azba = 1.82261843856185925133;
static const double const_T = 1.27246578267089012270;
static const double rhoc = 1.20709121521568721927;
static const double cAzc = .69691523038678375519;
static const double sAzc = .71715351331143607555;
static const double C45 = .70710678118654752469;
static const double S45 = .70710678118654752410;
static const double C20 = .93969262078590838411;
static const double S20 = -.34202014332566873287;
static const double R110 = 1.91986217719376253360;
static const double R104 = 1.81514242207410275904;
struct par_bipc
{
bool noskew;
};
template <typename T, typename Parameters>
struct base_bipc_spheroid
{
par_bipc m_proj_parm;
// FORWARD(s_forward) spheroid
// Project coordinates from geographic (lon, lat) to cartesian (x, y)
inline void fwd(Parameters const& , T const& lp_lon, T const& lp_lat, T& xy_x, T& xy_y) const
{
static const T half_pi = detail::half_pi<T>();
static const T pi = detail::pi<T>();
T cphi, sphi, tphi, t, al, Az, z, Av, cdlam, sdlam, r;
int tag;
cphi = cos(lp_lat);
sphi = sin(lp_lat);
cdlam = cos(sdlam = lamB - lp_lon);
sdlam = sin(sdlam);
if (fabs(fabs(lp_lat) - half_pi) < epsilon10) {
Az = lp_lat < 0. ? pi : 0.;
tphi = HUGE_VAL;
} else {
tphi = sphi / cphi;
Az = atan2(sdlam , C45 * (tphi - cdlam));
}
if( (tag = (Az > Azba)) ) {
cdlam = cos(sdlam = lp_lon + R110);
sdlam = sin(sdlam);
z = S20 * sphi + C20 * cphi * cdlam;
if (fabs(z) > 1.) {
if (fabs(z) > one_plus_eps)
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
else
z = z < 0. ? -1. : 1.;
} else
z = acos(z);
if (tphi != HUGE_VAL)
Az = atan2(sdlam, (C20 * tphi - S20 * cdlam));
Av = Azab;
xy_y = rhoc;
} else {
z = S45 * (sphi + cphi * cdlam);
if (fabs(z) > 1.) {
if (fabs(z) > one_plus_eps)
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
else
z = z < 0. ? -1. : 1.;
} else
z = acos(z);
Av = Azba;
xy_y = -rhoc;
}
if (z < 0.) {
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
}
r = F * (t = math::pow(tan(T(0.5) * z), n));
if ((al = .5 * (R104 - z)) < 0.) {
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
}
al = (t + math::pow(al, n)) / const_T;
if (fabs(al) > 1.) {
if (fabs(al) > one_plus_eps)
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
else
al = al < 0. ? -1. : 1.;
} else
al = acos(al);
if (fabs(t = n * (Av - Az)) < al)
r /= cos(al + (tag ? t : -t));
xy_x = r * sin(t);
xy_y += (tag ? -r : r) * cos(t);
if (this->m_proj_parm.noskew) {
t = xy_x;
xy_x = -xy_x * cAzc - xy_y * sAzc;
xy_y = -xy_y * cAzc + t * sAzc;
}
}
// INVERSE(s_inverse) spheroid
// Project coordinates from cartesian (x, y) to geographic (lon, lat)
inline void inv(Parameters const& , T xy_x, T xy_y, T& lp_lon, T& lp_lat) const
{
T t, r, rp, rl, al, z, fAz, Az, s, c, Av;
int neg, i;
if (this->m_proj_parm.noskew) {
t = xy_x;
xy_x = -xy_x * cAzc + xy_y * sAzc;
xy_y = -xy_y * cAzc - t * sAzc;
}
if( (neg = (xy_x < 0.)) ) {
xy_y = rhoc - xy_y;
s = S20;
c = C20;
Av = Azab;
} else {
xy_y += rhoc;
s = S45;
c = C45;
Av = Azba;
}
rl = rp = r = boost::math::hypot(xy_x, xy_y);
fAz = fabs(Az = atan2(xy_x, xy_y));
for (i = n_iter; i ; --i) {
z = 2. * atan(math::pow(r / F,T(1) / n));
al = acos((math::pow(tan(T(0.5) * z), n) +
math::pow(tan(T(0.5) * (R104 - z)), n)) / const_T);
if (fAz < al)
r = rp * cos(al + (neg ? Az : -Az));
if (fabs(rl - r) < epsilon)
break;
rl = r;
}
if (! i)
BOOST_THROW_EXCEPTION( projection_exception(error_tolerance_condition) );
Az = Av - Az / n;
lp_lat = asin(s * cos(z) + c * sin(z) * cos(Az));
lp_lon = atan2(sin(Az), c / tan(z) - s * cos(Az));
if (neg)
lp_lon -= R110;
else
lp_lon = lamB - lp_lon;
}
static inline std::string get_name()
{
return "bipc_spheroid";
}
};
// Bipolar conic of western hemisphere
template <typename Params, typename Parameters>
inline void setup_bipc(Params const& params, Parameters& par, par_bipc& proj_parm)
{
proj_parm.noskew = pj_get_param_b<srs::spar::ns>(params, "ns", srs::dpar::ns);
par.es = 0.;
}
}} // namespace detail::bipc
#endif // doxygen
/*!
\brief Bipolar conic of western hemisphere projection
\ingroup projections
\tparam Geographic latlong point type
\tparam Cartesian xy point type
\tparam Parameters parameter type
\par Projection characteristics
- Conic
- Spheroid
\par Projection parameters
- ns (boolean)
\par Example
\image html ex_bipc.gif
*/
template <typename T, typename Parameters>
struct bipc_spheroid : public detail::bipc::base_bipc_spheroid<T, Parameters>
{
template <typename Params>
inline bipc_spheroid(Params const& params, Parameters & par)
{
detail::bipc::setup_bipc(params, par, this->m_proj_parm);
}
};
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
// Static projection
BOOST_GEOMETRY_PROJECTIONS_DETAIL_STATIC_PROJECTION_FI(srs::spar::proj_bipc, bipc_spheroid)
// Factory entry(s)
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_ENTRY_FI(bipc_entry, bipc_spheroid)
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_BEGIN(bipc_init)
{
BOOST_GEOMETRY_PROJECTIONS_DETAIL_FACTORY_INIT_ENTRY(bipc, bipc_entry)
}
} // namespace detail
#endif // doxygen
} // namespace projections
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_PROJECTIONS_BIPC_HPP