96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// This file is manually converted from PROJ4
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// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// This file was modified by Oracle on 2017.
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// Modifications copyright (c) 2017, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// This file is converted from PROJ4, http://trac.osgeo.org/proj
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// PROJ4 is originally written by Gerald Evenden (then of the USGS)
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// PROJ4 is maintained by Frank Warmerdam
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// PROJ4 is converted to Geometry Library by Barend Gehrels (Geodan, Amsterdam)
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// Original copyright notice:
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#ifndef BOOST_GEOMETRY_PROJECTIONS_PJ_QSFN_HPP
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#define BOOST_GEOMETRY_PROJECTIONS_PJ_QSFN_HPP
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namespace boost { namespace geometry { namespace projections
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{
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namespace detail {
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/* determine small q */
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template <typename T>
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inline T pj_qsfn(T const& sinphi, T const& e, T const& one_es)
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{
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static const T EPSILON = 1.0e-7;
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if (e >= EPSILON)
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{
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T con = e * sinphi;
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return (one_es * (sinphi / (1. - con * con) -
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(.5 / e) * log ((1. - con) / (1. + con))));
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} else
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return (sinphi + sinphi);
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}
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static const int MAX_C = 9;
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template <typename T>
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struct AUTHALIC
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{
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T C[MAX_C], CP[MAX_C], CQ[MAX_C];
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};
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/**
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* @brief determine authalic latitude
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* @param[in] phi geographic latitude
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* @param[in] a initialized structure pointer
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* @return authalic latitude
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*/
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template <typename T>
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inline T proj_qsfn(T const& phi, AUTHALIC<T> const& a)
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{
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T s, s2, sum;
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int i = MAX_C;
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s = sin(phi);
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s2 = s * s;
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sum = a.CQ[MAX_C - 1];
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while (--i) sum = a.CQ[i] + s2 * sum;
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return(s * sum);
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}
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} // namespace detail
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}}} // namespace boost::geometry::projections
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#endif
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