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// Boost.Geometry
// Copyright (c) 2016-2017, 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_GEOGRAPHIC_INTERSECTION_ELLIPTIC_HPP
#define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_INTERSECTION_ELLIPTIC_HPP
#include <boost/geometry/srs/spheroid.hpp>
#include <boost/geometry/formulas/geographic.hpp>
#include <boost/geometry/strategies/spherical/intersection.hpp>
namespace boost { namespace geometry
{
namespace strategy { namespace intersection
{
template <typename Spheroid>
struct great_elliptic_segments_calc_policy
: spherical_segments_calc_policy
{
explicit great_elliptic_segments_calc_policy(Spheroid const& spheroid = Spheroid())
: m_spheroid(spheroid)
{}
template <typename Point, typename Point3d>
Point from_cart3d(Point3d const& point_3d) const
{
return formula::cart3d_to_geo<Point>(point_3d, m_spheroid);
}
template <typename Point3d, typename Point>
Point3d to_cart3d(Point const& point) const
{
return formula::geo_to_cart3d<Point3d>(point, m_spheroid);
}
// relate_xxx_calc_policy must live londer than plane because it contains
// Spheroid object and plane keeps the reference to that object.
template <typename Point3d>
struct plane
{
typedef typename coordinate_type<Point3d>::type coord_t;
// not normalized
plane(Point3d const& p1, Point3d const& p2)
: normal(cross_product(p1, p2))
{}
int side_value(Point3d const& pt) const
{
return formula::sph_side_value(normal, pt);
}
coord_t cos_angle_between(Point3d const& p1, Point3d const& p2) const
{
Point3d v1 = p1;
detail::vec_normalize(v1);
Point3d v2 = p2;
detail::vec_normalize(v2);
return dot_product(v1, v2);
}
coord_t cos_angle_between(Point3d const& p1, Point3d const& p2, bool & is_forward) const
{
coord_t const c0 = 0;
Point3d v1 = p1;
detail::vec_normalize(v1);
Point3d v2 = p2;
detail::vec_normalize(v2);
is_forward = dot_product(normal, cross_product(v1, v2)) >= c0;
return dot_product(v1, v2);
}
Point3d normal;
};
template <typename Point3d>
plane<Point3d> get_plane(Point3d const& p1, Point3d const& p2) const
{
return plane<Point3d>(p1, p2);
}
template <typename Point3d>
bool intersection_points(plane<Point3d> const& plane1,
plane<Point3d> const& plane2,
Point3d & ip1, Point3d & ip2) const
{
typedef typename coordinate_type<Point3d>::type coord_t;
Point3d id = cross_product(plane1.normal, plane2.normal);
// NOTE: the length should be greater than 0 at this point
// NOTE: no need to normalize in this case
ip1 = formula::projected_to_surface(id, m_spheroid);
ip2 = ip1;
multiply_value(ip2, coord_t(-1));
return true;
}
private:
Spheroid m_spheroid;
};
template <typename Spheroid>
struct experimental_elliptic_segments_calc_policy
{
explicit experimental_elliptic_segments_calc_policy(Spheroid const& spheroid = Spheroid())
: m_spheroid(spheroid)
{}
template <typename Point, typename Point3d>
Point from_cart3d(Point3d const& point_3d) const
{
return formula::cart3d_to_geo<Point>(point_3d, m_spheroid);
}
template <typename Point3d, typename Point>
Point3d to_cart3d(Point const& point) const
{
return formula::geo_to_cart3d<Point3d>(point, m_spheroid);
}
// relate_xxx_calc_policy must live londer than plane because it contains
// Spheroid object and plane keeps the reference to that object.
template <typename Point3d>
struct plane
{
typedef typename coordinate_type<Point3d>::type coord_t;
// not normalized
plane(Point3d const& p1, Point3d const& p2, Spheroid const& spheroid)
: m_spheroid(spheroid)
{
formula::experimental_elliptic_plane(p1, p2, origin, normal, m_spheroid);
}
int side_value(Point3d const& pt) const
{
return formula::elliptic_side_value(origin, normal, pt);
}
coord_t cos_angle_between(Point3d const& p1, Point3d const& p2) const
{
Point3d const v1 = normalized_vec(p1);
Point3d const v2 = normalized_vec(p2);
return dot_product(v1, v2);
}
coord_t cos_angle_between(Point3d const& p1, Point3d const& p2, bool & is_forward) const
{
coord_t const c0 = 0;
Point3d const v1 = normalized_vec(p1);
Point3d const v2 = normalized_vec(p2);
is_forward = dot_product(normal, cross_product(v1, v2)) >= c0;
return dot_product(v1, v2);
}
Point3d origin;
Point3d normal;
private:
Point3d normalized_vec(Point3d const& p) const
{
Point3d v = p;
subtract_point(v, origin);
detail::vec_normalize(v);
return v;
}
Spheroid const& m_spheroid;
};
template <typename Point3d>
plane<Point3d> get_plane(Point3d const& p1, Point3d const& p2) const
{
return plane<Point3d>(p1, p2, m_spheroid);
}
template <typename Point3d>
bool intersection_points(plane<Point3d> const& plane1,
plane<Point3d> const& plane2,
Point3d & ip1, Point3d & ip2) const
{
return formula::planes_spheroid_intersection(plane1.origin, plane1.normal,
plane2.origin, plane2.normal,
ip1, ip2, m_spheroid);
}
private:
Spheroid m_spheroid;
};
template
<
typename Spheroid = srs::spheroid<double>,
typename CalculationType = void
>
struct great_elliptic_segments
: ecef_segments
<
great_elliptic_segments_calc_policy<Spheroid>,
CalculationType
>
{};
template
<
typename Spheroid = srs::spheroid<double>,
typename CalculationType = void
>
struct experimental_elliptic_segments
: ecef_segments
<
experimental_elliptic_segments_calc_policy<Spheroid>,
CalculationType
>
{};
}} // namespace strategy::intersection
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_INTERSECTION_ELLIPTIC_HPP
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