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