273 lines
7.2 KiB
C++
273 lines
7.2 KiB
C++
// 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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// 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 1.0. (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_CORRECT_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_CORRECT_HPP
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#include <algorithm>
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#include <cstddef>
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#include <functional>
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#include <boost/mpl/assert.hpp>
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#include <boost/range.hpp>
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#include <boost/typeof/typeof.hpp>
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#include <boost/geometry/core/closure.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/mutable_range.hpp>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/core/exterior_ring.hpp>
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#include <boost/geometry/core/interior_rings.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/algorithms/area.hpp>
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#include <boost/geometry/algorithms/disjoint.hpp>
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#include <boost/geometry/util/order_as_direction.hpp>
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namespace boost { namespace geometry
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{
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// Silence warning C4127: conditional expression is constant
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#if defined(_MSC_VER)
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#pragma warning(push)
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#pragma warning(disable : 4127)
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#endif
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace correct
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{
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template <typename Geometry>
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struct correct_nop
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{
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static inline void apply(Geometry& )
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{}
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};
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template <typename Box, std::size_t Dimension, std::size_t DimensionCount>
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struct correct_box_loop
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{
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typedef typename coordinate_type<Box>::type coordinate_type;
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static inline void apply(Box& box)
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{
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if (get<min_corner, Dimension>(box) > get<max_corner, Dimension>(box))
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{
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// Swap the coordinates
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coordinate_type max_value = get<min_corner, Dimension>(box);
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coordinate_type min_value = get<max_corner, Dimension>(box);
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set<min_corner, Dimension>(box, min_value);
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set<max_corner, Dimension>(box, max_value);
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}
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correct_box_loop
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<
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Box, Dimension + 1, DimensionCount
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>::apply(box);
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}
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};
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template <typename Box, std::size_t DimensionCount>
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struct correct_box_loop<Box, DimensionCount, DimensionCount>
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{
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static inline void apply(Box& )
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{}
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};
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// Correct a box: make min/max correct
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template <typename Box>
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struct correct_box
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{
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static inline void apply(Box& box)
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{
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// Currently only for Cartesian coordinates
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// (or spherical without crossing dateline)
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// Future version: adapt using strategies
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correct_box_loop
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<
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Box, 0, dimension<Box>::type::value
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>::apply(box);
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}
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};
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// Close a ring, if not closed
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template <typename Ring, typename Predicate>
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struct correct_ring
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{
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typedef typename point_type<Ring>::type point_type;
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typedef typename coordinate_type<Ring>::type coordinate_type;
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typedef typename strategy::area::services::default_strategy
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<
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typename cs_tag<point_type>::type,
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point_type
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>::type strategy_type;
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typedef detail::area::ring_area
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<
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order_as_direction<geometry::point_order<Ring>::value>::value,
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geometry::closure<Ring>::value
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> ring_area_type;
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static inline void apply(Ring& r)
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{
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// Check close-ness
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if (boost::size(r) > 2)
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{
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// check if closed, if not, close it
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bool const disjoint = geometry::disjoint(*boost::begin(r), *(boost::end(r) - 1));
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closure_selector const s = geometry::closure<Ring>::value;
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if (disjoint && (s == closed))
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{
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geometry::append(r, *boost::begin(r));
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}
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if (! disjoint && s != closed)
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{
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// Open it by removing last point
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geometry::traits::resize<Ring>::apply(r, boost::size(r) - 1);
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}
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}
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// Check area
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Predicate predicate;
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typedef typename default_area_result<Ring>::type area_result_type;
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area_result_type const zero = area_result_type();
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if (predicate(ring_area_type::apply(r, strategy_type()), zero))
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{
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std::reverse(boost::begin(r), boost::end(r));
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}
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}
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};
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// Correct a polygon: normalizes all rings, sets outer ring clockwise, sets all
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// inner rings counter clockwise (or vice versa depending on orientation)
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template <typename Polygon>
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struct correct_polygon
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{
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typedef typename ring_type<Polygon>::type ring_type;
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typedef typename default_area_result<Polygon>::type area_result_type;
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static inline void apply(Polygon& poly)
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{
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correct_ring
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<
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ring_type,
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std::less<area_result_type>
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>::apply(exterior_ring(poly));
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typename interior_return_type<Polygon>::type rings
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= interior_rings(poly);
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for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
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{
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correct_ring
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<
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ring_type,
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std::greater<area_result_type>
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>::apply(*it);
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}
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}
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};
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}} // namespace detail::correct
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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 Geometry, typename Tag = typename tag<Geometry>::type>
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struct correct: not_implemented<Tag>
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{};
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template <typename Point>
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struct correct<Point, point_tag>
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: detail::correct::correct_nop<Point>
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{};
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template <typename LineString>
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struct correct<LineString, linestring_tag>
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: detail::correct::correct_nop<LineString>
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{};
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template <typename Segment>
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struct correct<Segment, segment_tag>
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: detail::correct::correct_nop<Segment>
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{};
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template <typename Box>
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struct correct<Box, box_tag>
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: detail::correct::correct_box<Box>
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{};
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template <typename Ring>
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struct correct<Ring, ring_tag>
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: detail::correct::correct_ring
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<
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Ring,
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std::less<typename default_area_result<Ring>::type>
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>
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{};
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template <typename Polygon>
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struct correct<Polygon, polygon_tag>
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: detail::correct::correct_polygon<Polygon>
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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 Corrects a geometry
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\details Corrects a geometry: all rings which are wrongly oriented with respect
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to their expected orientation are reversed. To all rings which do not have a
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closing point and are typed as they should have one, the first point is
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appended. Also boxes can be corrected.
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\ingroup correct
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry which will be corrected if necessary
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\qbk{[include reference/algorithms/correct.qbk]}
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*/
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template <typename Geometry>
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inline void correct(Geometry& geometry)
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{
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concept::check<Geometry const>();
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dispatch::correct<Geometry>::apply(geometry);
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}
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#if defined(_MSC_VER)
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#pragma warning(pop)
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#endif
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_CORRECT_HPP
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