// Boost.Geometry
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// Copyright (c) 2017-2019, Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
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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_SPHERICAL_DENSIFY_HPP
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#define BOOST_GEOMETRY_STRATEGIES_SPHERICAL_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/arithmetic/arithmetic.hpp>
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#include <boost/geometry/arithmetic/cross_product.hpp>
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#include <boost/geometry/arithmetic/dot_product.hpp>
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#include <boost/geometry/arithmetic/normalize.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/formulas/spherical.hpp>
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#include <boost/geometry/formulas/interpolate_point_spherical.hpp>
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#include <boost/geometry/geometries/point.hpp>
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#include <boost/geometry/srs/sphere.hpp>
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#include <boost/geometry/strategies/densify.hpp>
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#include <boost/geometry/strategies/spherical/get_radius.hpp>
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#include <boost/geometry/util/math.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 spherical segment.
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\ingroup strategies
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\tparam RadiusTypeOrSphere \tparam_radius_or_sphere
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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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}
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*/
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template
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<
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typename RadiusTypeOrSphere = double,
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typename CalculationType = void
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>
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class spherical
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{
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public:
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// For consistency with area strategy the radius is set to 1
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inline spherical()
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: m_radius(1.0)
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{}
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template <typename RadiusOrSphere>
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explicit inline spherical(RadiusOrSphere const& radius_or_sphere)
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: m_radius(strategy_detail::get_radius
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<
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RadiusOrSphere
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>::apply(radius_or_sphere))
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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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calc_t angle01;
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formula::interpolate_point_spherical<calc_t> formula;
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formula.compute_angle(p0, p1, angle01);
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BOOST_GEOMETRY_ASSERT(length_threshold > T(0));
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signed_size_type n = signed_size_type(angle01 * m_radius / length_threshold);
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if (n <= 0)
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return;
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formula.compute_axis(p0, angle01);
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calc_t step = angle01 / (n + 1);
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calc_t a = step;
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for (signed_size_type i = 0 ; i < n ; ++i, a += step)
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{
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out_point_t p;
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formula.compute_point(a, p);
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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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private:
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typename strategy_detail::get_radius
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<
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RadiusTypeOrSphere
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>::type m_radius;
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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<spherical_equatorial_tag>
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{
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typedef strategy::densify::spherical<> 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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