73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
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// Boost.Geometry
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// Copyright (c) 2016, 2018 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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#ifndef BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP
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#define BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP
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#include <boost/geometry/algorithms/not_implemented.hpp>
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#include <boost/geometry/core/radius.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/util/math.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DISPATCH
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namespace formula_dispatch
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{
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template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
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struct eccentricity_sqr
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: not_implemented<Tag>
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{};
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template <typename ResultType, typename Geometry>
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struct eccentricity_sqr<ResultType, Geometry, srs_sphere_tag>
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{
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static inline ResultType apply(Geometry const& /*geometry*/)
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{
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return ResultType(0);
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}
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};
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template <typename ResultType, typename Geometry>
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struct eccentricity_sqr<ResultType, Geometry, srs_spheroid_tag>
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{
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static inline ResultType apply(Geometry const& geometry)
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{
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// 1 - (b / a)^2
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return ResultType(1) - math::sqr(ResultType(get_radius<2>(geometry))
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/ ResultType(get_radius<0>(geometry)));
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}
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};
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} // namespace formula_dispatch
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#endif // DOXYGEN_NO_DISPATCH
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#ifndef DOXYGEN_NO_DETAIL
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namespace formula
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{
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template <typename ResultType, typename Geometry>
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ResultType eccentricity_sqr(Geometry const& geometry)
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{
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return formula_dispatch::eccentricity_sqr<ResultType, Geometry>::apply(geometry);
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}
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} // namespace formula
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP
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