--- /dev/null
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
+
+// This file was modified by Oracle on 2017.
+// Modifications copyright (c) 2017 Oracle and/or its affiliates.
+// 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.
+
+// Use, modification and distribution is subject to 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_ALGORITHMS_CORRECT_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_CORRECT_HPP
+
+
+#include <algorithm>
+#include <cstddef>
+#include <functional>
+
+#include <boost/mpl/assert.hpp>
+#include <boost/range.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/variant/static_visitor.hpp>
+#include <boost/variant/variant_fwd.hpp>
+
+#include <boost/geometry/algorithms/correct_closure.hpp>
+#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
+
+#include <boost/geometry/core/closure.hpp>
+#include <boost/geometry/core/cs.hpp>
+#include <boost/geometry/core/exterior_ring.hpp>
+#include <boost/geometry/core/interior_rings.hpp>
+#include <boost/geometry/core/mutable_range.hpp>
+#include <boost/geometry/core/ring_type.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+#include <boost/geometry/geometries/concepts/check.hpp>
+
+#include <boost/geometry/algorithms/area.hpp>
+#include <boost/geometry/algorithms/detail/multi_modify.hpp>
+#include <boost/geometry/util/order_as_direction.hpp>
+
+namespace boost { namespace geometry
+{
+
+// Silence warning C4127: conditional expression is constant
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable : 4127)
+#endif
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace correct
+{
+
+template <typename Geometry>
+struct correct_nop
+{
+ template <typename Strategy>
+ static inline void apply(Geometry& , Strategy const& )
+ {}
+};
+
+
+template <typename Box, std::size_t Dimension, std::size_t DimensionCount>
+struct correct_box_loop
+{
+ typedef typename coordinate_type<Box>::type coordinate_type;
+
+ static inline void apply(Box& box)
+ {
+ if (get<min_corner, Dimension>(box) > get<max_corner, Dimension>(box))
+ {
+ // Swap the coordinates
+ coordinate_type max_value = get<min_corner, Dimension>(box);
+ coordinate_type min_value = get<max_corner, Dimension>(box);
+ set<min_corner, Dimension>(box, min_value);
+ set<max_corner, Dimension>(box, max_value);
+ }
+
+ correct_box_loop
+ <
+ Box, Dimension + 1, DimensionCount
+ >::apply(box);
+ }
+};
+
+
+
+template <typename Box, std::size_t DimensionCount>
+struct correct_box_loop<Box, DimensionCount, DimensionCount>
+{
+ static inline void apply(Box& )
+ {}
+
+};
+
+
+// Correct a box: make min/max correct
+template <typename Box>
+struct correct_box
+{
+ template <typename Strategy>
+ static inline void apply(Box& box, Strategy const& )
+ {
+ // Currently only for Cartesian coordinates
+ // (or spherical without crossing dateline)
+ // Future version: adapt using strategies
+ correct_box_loop
+ <
+ Box, 0, dimension<Box>::type::value
+ >::apply(box);
+ }
+};
+
+
+// Close a ring, if not closed
+template <typename Ring, template <typename> class Predicate>
+struct correct_ring
+{
+ typedef typename point_type<Ring>::type point_type;
+ typedef typename coordinate_type<Ring>::type coordinate_type;
+
+ typedef detail::area::ring_area
+ <
+ order_as_direction<geometry::point_order<Ring>::value>::value,
+ geometry::closure<Ring>::value
+ > ring_area_type;
+
+
+ template <typename Strategy>
+ static inline void apply(Ring& r, Strategy const& strategy)
+ {
+ // Correct closure if necessary
+ detail::correct_closure::close_or_open_ring<Ring>::apply(r);
+
+ // Check area
+ typedef typename Strategy::return_type area_result_type;
+ Predicate<area_result_type> predicate;
+ area_result_type const zero = 0;
+ if (predicate(ring_area_type::apply(r, strategy), zero))
+ {
+ std::reverse(boost::begin(r), boost::end(r));
+ }
+ }
+};
+
+// Correct a polygon: normalizes all rings, sets outer ring clockwise, sets all
+// inner rings counter clockwise (or vice versa depending on orientation)
+template <typename Polygon>
+struct correct_polygon
+{
+ typedef typename ring_type<Polygon>::type ring_type;
+
+ template <typename Strategy>
+ static inline void apply(Polygon& poly, Strategy const& strategy)
+ {
+ correct_ring
+ <
+ ring_type,
+ std::less
+ >::apply(exterior_ring(poly), strategy);
+
+ typename interior_return_type<Polygon>::type
+ rings = interior_rings(poly);
+ for (typename detail::interior_iterator<Polygon>::type
+ it = boost::begin(rings); it != boost::end(rings); ++it)
+ {
+ correct_ring
+ <
+ ring_type,
+ std::greater
+ >::apply(*it, strategy);
+ }
+ }
+};
+
+
+}} // namespace detail::correct
+#endif // DOXYGEN_NO_DETAIL
+
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace dispatch
+{
+
+template <typename Geometry, typename Tag = typename tag<Geometry>::type>
+struct correct: not_implemented<Tag>
+{};
+
+template <typename Point>
+struct correct<Point, point_tag>
+ : detail::correct::correct_nop<Point>
+{};
+
+template <typename LineString>
+struct correct<LineString, linestring_tag>
+ : detail::correct::correct_nop<LineString>
+{};
+
+template <typename Segment>
+struct correct<Segment, segment_tag>
+ : detail::correct::correct_nop<Segment>
+{};
+
+
+template <typename Box>
+struct correct<Box, box_tag>
+ : detail::correct::correct_box<Box>
+{};
+
+template <typename Ring>
+struct correct<Ring, ring_tag>
+ : detail::correct::correct_ring
+ <
+ Ring,
+ std::less
+ >
+{};
+
+template <typename Polygon>
+struct correct<Polygon, polygon_tag>
+ : detail::correct::correct_polygon<Polygon>
+{};
+
+
+template <typename MultiPoint>
+struct correct<MultiPoint, multi_point_tag>
+ : detail::correct::correct_nop<MultiPoint>
+{};
+
+
+template <typename MultiLineString>
+struct correct<MultiLineString, multi_linestring_tag>
+ : detail::correct::correct_nop<MultiLineString>
+{};
+
+
+template <typename Geometry>
+struct correct<Geometry, multi_polygon_tag>
+ : detail::multi_modify
+ <
+ Geometry,
+ detail::correct::correct_polygon
+ <
+ typename boost::range_value<Geometry>::type
+ >
+ >
+{};
+
+
+} // namespace dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+
+namespace resolve_variant {
+
+template <typename Geometry>
+struct correct
+{
+ template <typename Strategy>
+ static inline void apply(Geometry& geometry, Strategy const& strategy)
+ {
+ concepts::check<Geometry const>();
+ dispatch::correct<Geometry>::apply(geometry, strategy);
+ }
+};
+
+template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
+struct correct<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
+{
+ template <typename Strategy>
+ struct visitor: boost::static_visitor<void>
+ {
+ Strategy const& m_strategy;
+
+ visitor(Strategy const& strategy): m_strategy(strategy) {}
+
+ template <typename Geometry>
+ void operator()(Geometry& geometry) const
+ {
+ correct<Geometry>::apply(geometry, m_strategy);
+ }
+ };
+
+ template <typename Strategy>
+ static inline void
+ apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry, Strategy const& strategy)
+ {
+ boost::apply_visitor(visitor<Strategy>(strategy), geometry);
+ }
+};
+
+} // namespace resolve_variant
+
+
+/*!
+\brief Corrects a geometry
+\details Corrects a geometry: all rings which are wrongly oriented with respect
+ to their expected orientation are reversed. To all rings which do not have a
+ closing point and are typed as they should have one, the first point is
+ appended. Also boxes can be corrected.
+\ingroup correct
+\tparam Geometry \tparam_geometry
+\param geometry \param_geometry which will be corrected if necessary
+
+\qbk{[include reference/algorithms/correct.qbk]}
+*/
+template <typename Geometry>
+inline void correct(Geometry& geometry)
+{
+ typedef typename point_type<Geometry>::type point_type;
+
+ typedef typename strategy::area::services::default_strategy
+ <
+ typename cs_tag<point_type>::type,
+ point_type
+ >::type strategy_type;
+
+ resolve_variant::correct<Geometry>::apply(geometry, strategy_type());
+}
+
+/*!
+\brief Corrects a geometry
+\details Corrects a geometry: all rings which are wrongly oriented with respect
+ to their expected orientation are reversed. To all rings which do not have a
+ closing point and are typed as they should have one, the first point is
+ appended. Also boxes can be corrected.
+\ingroup correct
+\tparam Geometry \tparam_geometry
+\tparam Strategy \tparam_strategy{Area}
+\param geometry \param_geometry which will be corrected if necessary
+\param strategy \param_strategy{area}
+
+\qbk{distinguish,with strategy}
+
+\qbk{[include reference/algorithms/correct.qbk]}
+*/
+template <typename Geometry, typename Strategy>
+inline void correct(Geometry& geometry, Strategy const& strategy)
+{
+ resolve_variant::correct<Geometry>::apply(geometry, strategy);
+}
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_CORRECT_HPP
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