142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
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// Boost.Geometry
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// Copyright (c) 2017-2021, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_DENSIFY_HPP
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#define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_DENSIFY_HPP
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#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>
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#include <boost/geometry/algorithms/detail/signed_size_type.hpp>
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#include <boost/geometry/core/assert.hpp>
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/radian_access.hpp>
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#include <boost/geometry/srs/spheroid.hpp>
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#include <boost/geometry/strategies/densify.hpp>
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#include <boost/geometry/strategies/geographic/parameters.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 densify
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{
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/*!
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\brief Densification of geographic segment.
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\ingroup strategies
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\tparam FormulaPolicy The geodesic formulas used internally.
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\tparam Spheroid The spheroid model.
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\tparam CalculationType \tparam_calculation
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\qbk{
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[heading See also]
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\* [link geometry.reference.algorithms.densify.densify_4_with_strategy densify (with strategy)]
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\* [link geometry.reference.srs.srs_spheroid srs::spheroid]
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}
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*/
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template
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<
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typename FormulaPolicy = strategy::andoyer,
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typename Spheroid = srs::spheroid<double>,
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typename CalculationType = void
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>
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class geographic
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{
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public:
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geographic()
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: m_spheroid()
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{}
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explicit geographic(Spheroid const& spheroid)
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: m_spheroid(spheroid)
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{}
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template <typename Point, typename AssignPolicy, typename T>
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inline void apply(Point const& p0, Point const& p1, AssignPolicy & policy, T const& length_threshold) const
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{
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typedef typename AssignPolicy::point_type out_point_t;
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typedef typename select_most_precise
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<
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typename coordinate_type<Point>::type,
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typename coordinate_type<out_point_t>::type,
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CalculationType
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>::type calc_t;
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typedef typename FormulaPolicy::template direct<calc_t, true, false, false, false> direct_t;
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typedef typename FormulaPolicy::template inverse<calc_t, true, true, false, false, false> inverse_t;
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typename inverse_t::result_type
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inv_r = inverse_t::apply(get_as_radian<0>(p0), get_as_radian<1>(p0),
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get_as_radian<0>(p1), get_as_radian<1>(p1),
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m_spheroid);
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BOOST_GEOMETRY_ASSERT(length_threshold > T(0));
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signed_size_type n = signed_size_type(inv_r.distance / length_threshold);
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if (n <= 0)
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return;
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calc_t step = inv_r.distance / (n + 1);
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calc_t current = step;
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for (signed_size_type i = 0 ; i < n ; ++i, current += step)
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{
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typename direct_t::result_type
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dir_r = direct_t::apply(get_as_radian<0>(p0), get_as_radian<1>(p0),
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current, inv_r.azimuth,
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m_spheroid);
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out_point_t p;
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set_from_radian<0>(p, dir_r.lon2);
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set_from_radian<1>(p, dir_r.lat2);
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geometry::detail::conversion::point_to_point
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<
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Point, out_point_t,
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2, dimension<out_point_t>::value
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>::apply(p0, p);
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policy.apply(p);
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}
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}
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inline Spheroid const& model() const
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{
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return m_spheroid;
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}
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private:
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Spheroid m_spheroid;
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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<geographic_tag>
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{
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typedef strategy::densify::geographic<> type;
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};
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} // namespace services
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#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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}} // namespace strategy::densify
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DENSIFY_HPP
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