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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2017-2020.
// Modifications copyright (c) 2017-2020, Oracle and/or its affiliates.
// 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_SPHERICAL_COMPARE_HPP
#define BOOST_GEOMETRY_STRATEGIES_SPHERICAL_COMPARE_HPP
#include <type_traits>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/coordinate_dimension.hpp>
#include <boost/geometry/core/coordinate_system.hpp>
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/cs.hpp>
#include <boost/geometry/core/radian_access.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/strategies/compare.hpp>
#include <boost/geometry/util/math.hpp>
#include <boost/geometry/util/normalize_spheroidal_coordinates.hpp>
namespace boost { namespace geometry
{
namespace strategy { namespace compare
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
template <std::size_t I, typename P>
static inline typename geometry::coordinate_type<P>::type
get(P const& p, std::true_type /*same units*/)
{
return geometry::get<I>(p);
}
template <std::size_t I, typename P>
static inline typename geometry::coordinate_type<P>::type
get(P const& p, std::false_type /*different units*/)
{
return geometry::get_as_radian<I>(p);
}
template
<
typename ComparePolicy,
typename Point1,
typename Point2,
std::size_t DimensionCount
>
struct spherical_latitude
{
typedef typename geometry::coordinate_type<Point1>::type coordinate1_type;
typedef typename geometry::detail::cs_angular_units<Point1>::type units1_type;
typedef typename geometry::coordinate_type<Point2>::type coordinate2_type;
typedef typename geometry::detail::cs_angular_units<Point2>::type units2_type;
typedef std::is_same<units1_type, units2_type> same_units_type;
template <typename T1, typename T2>
static inline bool apply(Point1 const& left, Point2 const& right,
T1 const& l1, T2 const& r1)
{
// latitudes equal
if (math::equals(l1, r1))
{
return compare::detail::compare_loop
<
ComparePolicy, 2, DimensionCount
>::apply(left, right);
}
else
{
return ComparePolicy::apply(l1, r1);
}
}
static inline bool apply(Point1 const& left, Point2 const& right)
{
coordinate1_type const& l1 = compare::detail::get<1>(left, same_units_type());
coordinate2_type const& r1 = compare::detail::get<1>(right, same_units_type());
return apply(left, right, l1, r1);
}
};
template
<
typename ComparePolicy,
typename Point1,
typename Point2
>
struct spherical_latitude<ComparePolicy, Point1, Point2, 1>
{
template <typename T1, typename T2>
static inline bool apply(Point1 const& left, Point2 const& right,
T1 const& , T2 const& )
{
return apply(left, right);
}
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::compare_loop
<
ComparePolicy, 1, 1
>::apply(left, right);
}
};
template
<
typename ComparePolicy,
typename Point1,
typename Point2,
std::size_t DimensionCount
>
struct spherical_longitude
{
typedef typename geometry::coordinate_type<Point1>::type coordinate1_type;
typedef typename geometry::detail::cs_angular_units<Point1>::type units1_type;
typedef typename geometry::coordinate_type<Point2>::type coordinate2_type;
typedef typename geometry::detail::cs_angular_units<Point2>::type units2_type;
typedef std::is_same<units1_type, units2_type> same_units_type;
typedef std::conditional_t<same_units_type::value, units1_type, geometry::radian> units_type;
static const bool is_equatorial = ! std::is_same
<
typename geometry::cs_tag<Point1>::type,
geometry::spherical_polar_tag
>::value;
static inline bool are_both_at_antimeridian(coordinate1_type const& l0,
coordinate2_type const& r0,
bool & is_left_at,
bool & is_right_at)
{
is_left_at = math::is_longitude_antimeridian<units_type>(l0);
is_right_at = math::is_longitude_antimeridian<units_type>(r0);
return is_left_at && is_right_at;
}
static inline bool apply(Point1 const& left, Point2 const& right)
{
// if units are different the coordinates are in radians
coordinate1_type const& l0 = compare::detail::get<0>(left, same_units_type());
coordinate2_type const& r0 = compare::detail::get<0>(right, same_units_type());
coordinate1_type const& l1 = compare::detail::get<1>(left, same_units_type());
coordinate2_type const& r1 = compare::detail::get<1>(right, same_units_type());
bool is_left_at_antimeridian = false;
bool is_right_at_antimeridian = false;
// longitudes equal
if (math::equals(l0, r0)
// both at antimeridian
|| are_both_at_antimeridian(l0, r0, is_left_at_antimeridian, is_right_at_antimeridian)
// both at pole
|| (math::equals(l1, r1)
&& math::is_latitude_pole<units_type, is_equatorial>(l1)))
{
return spherical_latitude
<
ComparePolicy, Point1, Point2, DimensionCount
>::apply(left, right, l1, r1);
}
// if left is at antimeridian and right is not at antimeridian
// then left is greater than right
else if (is_left_at_antimeridian)
{
// less/equal_to -> false, greater -> true
return ComparePolicy::apply(1, 0);
}
// if right is at antimeridian and left is not at antimeridian
// then left is lesser than right
else if (is_right_at_antimeridian)
{
// less -> true, equal_to/greater -> false
return ComparePolicy::apply(0, 1);
}
else
{
return ComparePolicy::apply(l0, r0);
}
}
};
} // namespace detail
#endif // DOXYGEN_NO_DETAIL
/*!
\brief Compare strategy for spherical coordinates
\ingroup strategies
\tparam Point point-type
\tparam Dimension dimension
*/
template
<
typename ComparePolicy,
int Dimension = -1
>
struct spherical
: cartesian<ComparePolicy, Dimension>
{};
#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
// all dimensions starting from longitude
template <typename ComparePolicy>
struct spherical<ComparePolicy, -1>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::spherical_longitude
<
ComparePolicy,
Point1,
Point2,
std::conditional_t
<
(dimension<Point1>::value < dimension<Point2>::value),
std::integral_constant<std::size_t, dimension<Point1>::value>,
std::integral_constant<std::size_t, dimension<Point2>::value>
>::value
>::apply(left, right);
}
};
// only longitudes (and latitudes to check poles)
template <typename ComparePolicy>
struct spherical<ComparePolicy, 0>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::spherical_longitude
<
ComparePolicy, Point1, Point2, 1
>::apply(left, right);
}
};
// only latitudes
template <typename ComparePolicy>
struct spherical<ComparePolicy, 1>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::spherical_latitude
<
ComparePolicy, Point1, Point2, 2
>::apply(left, right);
}
};
#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
namespace services
{
template <typename ComparePolicy, typename Point1, typename Point2, int Dimension>
struct default_strategy
<
ComparePolicy, Point1, Point2, Dimension,
spherical_tag, spherical_tag
>
{
typedef compare::spherical<ComparePolicy, Dimension> type;
};
template <typename ComparePolicy, typename Point1, typename Point2, int Dimension>
struct default_strategy
<
ComparePolicy, Point1, Point2, Dimension,
spherical_polar_tag, spherical_polar_tag
>
{
typedef compare::spherical<ComparePolicy, Dimension> type;
};
template <typename ComparePolicy, typename Point1, typename Point2, int Dimension>
struct default_strategy
<
ComparePolicy, Point1, Point2, Dimension,
spherical_equatorial_tag, spherical_equatorial_tag
>
{
typedef compare::spherical<ComparePolicy, Dimension> type;
};
template <typename ComparePolicy, typename Point1, typename Point2, int Dimension>
struct default_strategy
<
ComparePolicy, Point1, Point2, Dimension,
geographic_tag, geographic_tag
>
{
typedef compare::spherical<ComparePolicy, Dimension> type;
};
} // namespace services
}} // namespace strategy::compare
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_SPHERICAL_COMPARE_HPP
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