// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2017-2020.
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// Modifications copyright (c) 2017-2020 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.Dimension. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_POINT_ON_BORDER_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_POINT_ON_BORDER_HPP
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#include <cstddef>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/algorithms/assign.hpp>
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#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>
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#include <boost/geometry/algorithms/detail/equals/point_point.hpp>
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#include <boost/geometry/util/condition.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace point_on_border
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{
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struct get_point
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{
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template <typename Point>
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static inline bool apply(Point& destination, Point const& source)
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{
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destination = source;
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return true;
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}
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};
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struct point_on_range
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{
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// Version with iterator
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template<typename Point, typename Iterator>
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static inline bool apply(Point& point, Iterator begin, Iterator end)
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{
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if (begin == end)
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{
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return false;
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}
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geometry::detail::conversion::convert_point_to_point(*begin, point);
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return true;
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}
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// Version with range
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template<typename Point, typename Range>
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static inline bool apply(Point& point, Range const& range)
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{
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return apply(point, boost::begin(range), boost::end(range));
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}
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};
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struct point_on_polygon
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{
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template<typename Point, typename Polygon>
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static inline bool apply(Point& point, Polygon const& polygon)
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{
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return point_on_range::apply(point, exterior_ring(polygon));
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}
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};
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struct point_on_box
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{
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template<typename Point, typename Box>
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static inline bool apply(Point& point, Box const& box)
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{
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detail::assign::assign_box_2d_corner<min_corner, min_corner>(box, point);
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return true;
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}
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};
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template <typename Policy>
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struct point_on_multi
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{
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template<typename Point, typename MultiGeometry>
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static inline bool apply(Point& point, MultiGeometry const& multi)
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{
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// Take a point on the first multi-geometry
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// (i.e. the first that is not empty)
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for (typename boost::range_iterator
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<
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MultiGeometry const
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>::type it = boost::begin(multi);
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it != boost::end(multi);
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++it)
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{
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if (Policy::apply(point, *it))
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{
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return true;
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}
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}
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return false;
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}
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};
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}} // namespace detail::point_on_border
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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template <typename GeometryTag>
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struct point_on_border
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{};
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template <>
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struct point_on_border<point_tag>
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: detail::point_on_border::get_point
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{};
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template <>
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struct point_on_border<linestring_tag>
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: detail::point_on_border::point_on_range
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{};
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template <>
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struct point_on_border<ring_tag>
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: detail::point_on_border::point_on_range
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{};
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template <>
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struct point_on_border<polygon_tag>
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: detail::point_on_border::point_on_polygon
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{};
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template <>
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struct point_on_border<box_tag>
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: detail::point_on_border::point_on_box
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{};
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template <>
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struct point_on_border<multi_polygon_tag>
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: detail::point_on_border::point_on_multi
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<
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detail::point_on_border::point_on_polygon
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>
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{};
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template <>
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struct point_on_border<multi_linestring_tag>
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: detail::point_on_border::point_on_multi
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<
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detail::point_on_border::point_on_range
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>
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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/*!
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\brief Take point on a border
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\ingroup overlay
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\tparam Geometry geometry type. This also defines the type of the output point
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\param point to assign
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\param geometry geometry to take point from
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\return TRUE if successful, else false.
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It is only false if polygon/line have no points
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\note for a polygon, it is always a point on the exterior ring
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*/
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template <typename Point, typename Geometry>
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inline bool point_on_border(Point& point, Geometry const& geometry)
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{
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concepts::check<Point>();
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concepts::check<Geometry const>();
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return dispatch::point_on_border
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<
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typename tag<Geometry>::type
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>::apply(point, geometry);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_POINT_ON_BORDER_HPP
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