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// Boost.Geometry
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2014-2021.
// Modifications copyright (c) 2014-2021, Oracle and/or its affiliates.
// Contributed and/or modified by Vissarion Fysikopoulos, 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_ALGORITHMS_AZIMUTH_HPP
#define BOOST_GEOMETRY_ALGORITHMS_AZIMUTH_HPP
#include <boost/geometry/algorithms/not_implemented.hpp>
#include <boost/geometry/core/cs.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/radian_access.hpp>
#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>
#include <boost/geometry/strategies/azimuth/cartesian.hpp>
#include <boost/geometry/strategies/azimuth/geographic.hpp>
#include <boost/geometry/strategies/azimuth/spherical.hpp>
#include <boost/geometry/util/math.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
} // namespace detail
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template
<
typename Geometry1, typename Geometry2,
typename Tag1 = typename tag<Geometry1>::type,
typename Tag2 = typename tag<Geometry2>::type
>
struct azimuth : not_implemented<Tag1, Tag2>
{};
template <typename Point1, typename Point2>
struct azimuth<Point1, Point2, point_tag, point_tag>
{
template <typename Strategy>
static auto apply(Point1 const& p1, Point2 const& p2, Strategy const& strategy)
{
typedef typename decltype(strategy.azimuth())::template result_type
<
typename coordinate_type<Point1>::type,
typename coordinate_type<Point2>::type
>::type calc_t;
calc_t result = 0;
calc_t const x1 = geometry::get_as_radian<0>(p1);
calc_t const y1 = geometry::get_as_radian<1>(p1);
calc_t const x2 = geometry::get_as_radian<0>(p2);
calc_t const y2 = geometry::get_as_radian<1>(p2);
strategy.azimuth().apply(x1, y1, x2, y2, result);
// NOTE: It is not clear which units we should use for the result.
// For now radians are always returned but a user could expect
// e.g. something like this:
/*
bool const both_degree = std::is_same
<
typename detail::cs_angular_units<Point1>::type,
geometry::degree
>::value
&& std::is_same
<
typename detail::cs_angular_units<Point2>::type,
geometry::degree
>::value;
if (both_degree)
{
result *= math::r2d<calc_t>();
}
*/
return result;
}
};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
namespace resolve_strategy
{
template
<
typename Strategy,
bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
>
struct azimuth
{
template <typename P1, typename P2>
static auto apply(P1 const& p1, P2 const& p2, Strategy const& strategy)
{
return dispatch::azimuth<P1, P2>::apply(p1, p2, strategy);
}
};
template <typename Strategy>
struct azimuth<Strategy, false>
{
template <typename P1, typename P2>
static auto apply(P1 const& p1, P2 const& p2, Strategy const& strategy)
{
using strategies::azimuth::services::strategy_converter;
return dispatch::azimuth
<
P1, P2
>::apply(p1, p2, strategy_converter<Strategy>::get(strategy));
}
};
template <>
struct azimuth<default_strategy, false>
{
template <typename P1, typename P2>
static auto apply(P1 const& p1, P2 const& p2, default_strategy)
{
typedef typename strategies::azimuth::services::default_strategy
<
P1, P2
>::type strategy_type;
return dispatch::azimuth<P1, P2>::apply(p1, p2, strategy_type());
}
};
} // namespace resolve_strategy
namespace resolve_variant
{
} // namespace resolve_variant
/*!
\brief Calculate azimuth of a segment defined by a pair of points.
\ingroup azimuth
\tparam Point1 Type of the first point of a segment.
\tparam Point2 Type of the second point of a segment.
\param point1 First point of a segment.
\param point2 Second point of a segment.
\return Azimuth in radians.
\qbk{[include reference/algorithms/azimuth.qbk]}
\qbk{
[heading Example]
[azimuth]
[azimuth_output]
}
*/
template <typename Point1, typename Point2>
inline auto azimuth(Point1 const& point1, Point2 const& point2)
{
concepts::check<Point1 const>();
concepts::check<Point2 const>();
return resolve_strategy::azimuth
<
default_strategy
>::apply(point1, point2, default_strategy());
}
/*!
\brief Calculate azimuth of a segment defined by a pair of points.
\ingroup azimuth
\tparam Point1 Type of the first point of a segment.
\tparam Point2 Type of the second point of a segment.
\tparam Strategy Type of an umbrella strategy defining azimuth strategy.
\param point1 First point of a segment.
\param point2 Second point of a segment.
\param strategy Umbrella strategy defining azimuth strategy.
\return Azimuth in radians.
\qbk{distinguish,with strategy}
\qbk{[include reference/algorithms/azimuth.qbk]}
\qbk{
[heading Example]
[azimuth_strategy]
[azimuth_strategy_output]
}
*/
template <typename Point1, typename Point2, typename Strategy>
inline auto azimuth(Point1 const& point1, Point2 const& point2, Strategy const& strategy)
{
concepts::check<Point1 const>();
concepts::check<Point2 const>();
return resolve_strategy::azimuth<Strategy>::apply(point1, point2, strategy);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_AZIMUTH_HPP
|
