101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2016-2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fisikopoulos, on behalf of Oracle
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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_STRATEGIES_CARTESIAN_AZIMUTH_HPP
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#define BOOST_GEOMETRY_STRATEGIES_CARTESIAN_AZIMUTH_HPP
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#include <cmath>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/coordinate_promotion.hpp>
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#include <boost/geometry/strategies/azimuth.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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namespace boost { namespace geometry
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{
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namespace strategy { namespace azimuth
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{
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template <typename CalculationType = void>
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class cartesian
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{
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public:
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template <typename T1, typename T2>
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struct result_type
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: geometry::select_most_precise
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<
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// NOTE: this promotes any integer type to double
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typename geometry::promote_floating_point<T1, double>::type,
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typename geometry::promote_floating_point<T2, double>::type,
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CalculationType
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>
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{};
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template <typename T1, typename T2, typename Result>
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static inline void apply(T1 const& x1, T1 const& y1,
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T2 const& x2, T2 const& y2,
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Result& a1, Result& a2)
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{
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compute(x1, y1, x2, y2, a1, a2);
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}
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template <typename T1, typename T2, typename Result>
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static inline void apply(T1 const& x1, T1 const& y1,
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T2 const& x2, T2 const& y2,
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Result& a1)
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{
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compute(x1, y1, x2, y2, a1, a1);
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}
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template <typename T1, typename T2, typename Result>
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static inline void apply_reverse(T1 const& x1, T1 const& y1,
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T2 const& x2, T2 const& y2,
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Result& a2)
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{
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compute(x1, y1, x2, y2, a2, a2);
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}
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private:
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template <typename T1, typename T2, typename Result>
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static inline void compute(T1 const& x1, T1 const& y1,
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T2 const& x2, T2 const& y2,
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Result& a1, Result& a2)
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{
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typedef typename result_type<T1, T2>::type calc_t;
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// NOTE: azimuth 0 is at Y axis, increasing right
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// as in spherical/geographic where 0 is at North axis
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a1 = a2 = atan2(calc_t(x2) - calc_t(x1), calc_t(y2) - calc_t(y1));
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}
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};
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#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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namespace services
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{
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template <>
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struct default_strategy<cartesian_tag>
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{
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typedef strategy::azimuth::cartesian<> type;
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};
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}
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#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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}} // namespace strategy::azimuth
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_CARTESIAN_AZIMUTH_HPP
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