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Diffstat (limited to 'boost/geometry/strategies/spherical/expand_point.hpp')
| -rw-r--r-- | boost/geometry/strategies/spherical/expand_point.hpp | 233 |
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diff --git a/boost/geometry/strategies/spherical/expand_point.hpp b/boost/geometry/strategies/spherical/expand_point.hpp new file mode 100644 index 0000000000..b2cff013ae --- /dev/null +++ b/boost/geometry/strategies/spherical/expand_point.hpp @@ -0,0 +1,233 @@ +// Boost.Geometry (aka GGL, Generic Geometry Library) + +// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands. +// Copyright (c) 2008-2015 Bruno Lalande, Paris, France. +// Copyright (c) 2009-2015 Mateusz Loskot, London, UK. +// Copyright (c) 2014-2015 Samuel Debionne, Grenoble, France. + +// This file was modified by Oracle on 2015-2018. +// Modifications copyright (c) 2015-2018, Oracle and/or its affiliates. + +// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle +// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle +// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle + +// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library +// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. + +// Distributed under 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_EXPAND_POINT_HPP +#define BOOST_GEOMETRY_STRATEGIES_SPHERICAL_EXPAND_POINT_HPP + +#include <cstddef> +#include <algorithm> +#include <functional> + +#include <boost/mpl/assert.hpp> +#include <boost/type_traits/is_same.hpp> + +#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/tags.hpp> + +#include <boost/geometry/util/is_inverse_spheroidal_coordinates.hpp> +#include <boost/geometry/util/math.hpp> +#include <boost/geometry/util/select_coordinate_type.hpp> + +#include <boost/geometry/algorithms/detail/normalize.hpp> +#include <boost/geometry/algorithms/detail/envelope/transform_units.hpp> + +#include <boost/geometry/strategies/expand.hpp> +#include <boost/geometry/strategies/cartesian/expand_point.hpp> + + +namespace boost { namespace geometry +{ + +namespace strategy { namespace expand +{ + +#ifndef DOXYGEN_NO_DETAIL +namespace detail +{ + +// implementation for the spherical and geographic coordinate systems +template <std::size_t DimensionCount, bool IsEquatorial> +struct point_loop_on_spheroid +{ + template <typename Box, typename Point> + static inline void apply(Box& box, Point const& point) + { + typedef typename point_type<Box>::type box_point_type; + typedef typename coordinate_type<Box>::type box_coordinate_type; + typedef typename geometry::detail::cs_angular_units<Box>::type units_type; + + typedef math::detail::constants_on_spheroid + < + box_coordinate_type, + units_type + > constants; + + // normalize input point and input box + Point p_normalized; + strategy::normalize::spherical_point::apply(point, p_normalized); + + // transform input point to be of the same type as the box point + box_point_type box_point; + geometry::detail::envelope::transform_units(p_normalized, box_point); + + if (is_inverse_spheroidal_coordinates(box)) + { + geometry::set_from_radian<min_corner, 0>(box, geometry::get_as_radian<0>(p_normalized)); + geometry::set_from_radian<min_corner, 1>(box, geometry::get_as_radian<1>(p_normalized)); + geometry::set_from_radian<max_corner, 0>(box, geometry::get_as_radian<0>(p_normalized)); + geometry::set_from_radian<max_corner, 1>(box, geometry::get_as_radian<1>(p_normalized)); + + } else { + + strategy::normalize::spherical_box::apply(box, box); + + box_coordinate_type p_lon = geometry::get<0>(box_point); + box_coordinate_type p_lat = geometry::get<1>(box_point); + + typename coordinate_type<Box>::type + b_lon_min = geometry::get<min_corner, 0>(box), + b_lat_min = geometry::get<min_corner, 1>(box), + b_lon_max = geometry::get<max_corner, 0>(box), + b_lat_max = geometry::get<max_corner, 1>(box); + + if (math::is_latitude_pole<units_type, IsEquatorial>(p_lat)) + { + // the point of expansion is the either the north or the + // south pole; the only important coordinate here is the + // pole's latitude, as the longitude can be anything; + // we, thus, take into account the point's latitude only and return + geometry::set<min_corner, 1>(box, (std::min)(p_lat, b_lat_min)); + geometry::set<max_corner, 1>(box, (std::max)(p_lat, b_lat_max)); + return; + } + + if (math::equals(b_lat_min, b_lat_max) + && math::is_latitude_pole<units_type, IsEquatorial>(b_lat_min)) + { + // the box degenerates to either the north or the south pole; + // the only important coordinate here is the pole's latitude, + // as the longitude can be anything; + // we thus take into account the box's latitude only and return + geometry::set<min_corner, 0>(box, p_lon); + geometry::set<min_corner, 1>(box, (std::min)(p_lat, b_lat_min)); + geometry::set<max_corner, 0>(box, p_lon); + geometry::set<max_corner, 1>(box, (std::max)(p_lat, b_lat_max)); + return; + } + + // update latitudes + b_lat_min = (std::min)(b_lat_min, p_lat); + b_lat_max = (std::max)(b_lat_max, p_lat); + + // update longitudes + if (math::smaller(p_lon, b_lon_min)) + { + box_coordinate_type p_lon_shifted = p_lon + constants::period(); + + if (math::larger(p_lon_shifted, b_lon_max)) + { + // here we could check using: ! math::larger(.., ..) + if (math::smaller(b_lon_min - p_lon, p_lon_shifted - b_lon_max)) + { + b_lon_min = p_lon; + } + else + { + b_lon_max = p_lon_shifted; + } + } + } + else if (math::larger(p_lon, b_lon_max)) + { + // in this case, and since p_lon is normalized in the range + // (-180, 180], we must have that b_lon_max <= 180 + if (b_lon_min < 0 + && math::larger(p_lon - b_lon_max, + constants::period() - p_lon + b_lon_min)) + { + b_lon_min = p_lon; + b_lon_max += constants::period(); + } + else + { + b_lon_max = p_lon; + } + } + + geometry::set<min_corner, 0>(box, b_lon_min); + geometry::set<min_corner, 1>(box, b_lat_min); + geometry::set<max_corner, 0>(box, b_lon_max); + geometry::set<max_corner, 1>(box, b_lat_max); + } + + point_loop + < + 2, DimensionCount + >::apply(box, point); + } +}; + + +} // namespace detail +#endif // DOXYGEN_NO_DETAIL + + +struct spherical_point +{ + template <typename Box, typename Point> + static void apply(Box & box, Point const& point) + { + expand::detail::point_loop_on_spheroid + < + dimension<Point>::value, + ! boost::is_same<typename cs_tag<Point>::type, spherical_polar_tag>::value + >::apply(box, point); + } +}; + + +#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS + +namespace services +{ + +template <typename CalculationType> +struct default_strategy<point_tag, spherical_equatorial_tag, CalculationType> +{ + typedef spherical_point type; +}; + +template <typename CalculationType> +struct default_strategy<point_tag, spherical_polar_tag, CalculationType> +{ + typedef spherical_point type; +}; + +template <typename CalculationType> +struct default_strategy<point_tag, geographic_tag, CalculationType> +{ + typedef spherical_point type; +}; + + +} // namespace services + +#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS + + +}} // namespace strategy::expand + +}} // namespace boost::geometry + +#endif // BOOST_GEOMETRY_STRATEGIES_SPHERICAL_EXPAND_POINT_HPP |