Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@16: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@16: // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
Chris@16: // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
Chris@101: // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
Chris@16: #define BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
Chris@16: 
Chris@16: #include <algorithm>
Chris@16: 
Chris@16: #include <boost/range.hpp>
Chris@101: #include <boost/type_traits/remove_reference.hpp>
Chris@16: 
Chris@101: #include <boost/variant/apply_visitor.hpp>
Chris@101: #include <boost/variant/static_visitor.hpp>
Chris@101: #include <boost/variant/variant_fwd.hpp>
Chris@101: 
Chris@101: #include <boost/geometry/algorithms/detail/interior_iterator.hpp>
Chris@101: #include <boost/geometry/algorithms/detail/multi_modify.hpp>
Chris@16: #include <boost/geometry/core/interior_rings.hpp>
Chris@101: #include <boost/geometry/core/tags.hpp>
Chris@16: #include <boost/geometry/geometries/concepts/check.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: #ifndef DOXYGEN_NO_DETAIL
Chris@16: namespace detail { namespace reverse
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: struct range_reverse
Chris@16: {
Chris@16:     template <typename Range>
Chris@16:     static inline void apply(Range& range)
Chris@16:     {
Chris@16:         std::reverse(boost::begin(range), boost::end(range));
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: struct polygon_reverse: private range_reverse
Chris@16: {
Chris@16:     template <typename Polygon>
Chris@16:     static inline void apply(Polygon& polygon)
Chris@16:     {
Chris@16:         range_reverse::apply(exterior_ring(polygon));
Chris@16: 
Chris@101:         typename interior_return_type<Polygon>::type
Chris@101:             rings = interior_rings(polygon);
Chris@101: 
Chris@101:         for (typename detail::interior_iterator<Polygon>::type
Chris@101:                 it = boost::begin(rings); it != boost::end(rings); ++it)
Chris@16:         {
Chris@16:             range_reverse::apply(*it);
Chris@16:         }
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: }} // namespace detail::reverse
Chris@16: #endif // DOXYGEN_NO_DETAIL
Chris@16: 
Chris@16: 
Chris@16: #ifndef DOXYGEN_NO_DISPATCH
Chris@16: namespace dispatch
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: template <typename Geometry, typename Tag = typename tag<Geometry>::type>
Chris@16: struct reverse
Chris@16: {
Chris@16:     static inline void apply(Geometry&)
Chris@16:     {}
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <typename Ring>
Chris@16: struct reverse<Ring, ring_tag>
Chris@16:     : detail::reverse::range_reverse
Chris@16: {};
Chris@16: 
Chris@16: 
Chris@16: template <typename LineString>
Chris@16: struct reverse<LineString, linestring_tag>
Chris@16:     : detail::reverse::range_reverse
Chris@16: {};
Chris@16: 
Chris@16: 
Chris@16: template <typename Polygon>
Chris@16: struct reverse<Polygon, polygon_tag>
Chris@16:     : detail::reverse::polygon_reverse
Chris@16: {};
Chris@16: 
Chris@16: 
Chris@101: template <typename Geometry>
Chris@101: struct reverse<Geometry, multi_linestring_tag>
Chris@101:     : detail::multi_modify
Chris@101:         <
Chris@101:             Geometry,
Chris@101:             detail::reverse::range_reverse
Chris@101:         >
Chris@101: {};
Chris@101: 
Chris@101: 
Chris@101: template <typename Geometry>
Chris@101: struct reverse<Geometry, multi_polygon_tag>
Chris@101:     : detail::multi_modify
Chris@101:         <
Chris@101:             Geometry,
Chris@101:             detail::reverse::polygon_reverse
Chris@101:         >
Chris@101: {};
Chris@101: 
Chris@101: 
Chris@101: 
Chris@16: } // namespace dispatch
Chris@16: #endif
Chris@16: 
Chris@16: 
Chris@101: namespace resolve_variant
Chris@101: {
Chris@101: 
Chris@101: template <typename Geometry>
Chris@101: struct reverse
Chris@101: {
Chris@101:     static void apply(Geometry& geometry)
Chris@101:     {
Chris@101:         concept::check<Geometry>();
Chris@101:         dispatch::reverse<Geometry>::apply(geometry);
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@101: template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
Chris@101: struct reverse<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
Chris@101: {
Chris@101:     struct visitor: boost::static_visitor<void>
Chris@101:     {
Chris@101:         template <typename Geometry>
Chris@101:         void operator()(Geometry& geometry) const
Chris@101:         {
Chris@101:             reverse<Geometry>::apply(geometry);
Chris@101:         }
Chris@101:     };
Chris@101: 
Chris@101:     static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry)
Chris@101:     {
Chris@101:         boost::apply_visitor(visitor(), geometry);
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@101: } // namespace resolve_variant
Chris@101: 
Chris@101: 
Chris@16: /*!
Chris@16: \brief Reverses the points within a geometry
Chris@16: \details Generic function to reverse a geometry. It resembles the std::reverse
Chris@16:    functionality, but it takes the geometry type into account. Only for a ring
Chris@16:    or for a linestring it is the same as the std::reverse.
Chris@16: \ingroup reverse
Chris@16: \tparam Geometry \tparam_geometry
Chris@16: \param geometry \param_geometry which will be reversed
Chris@16: 
Chris@16: \qbk{[include reference/algorithms/reverse.qbk]}
Chris@16: */
Chris@16: template <typename Geometry>
Chris@16: inline void reverse(Geometry& geometry)
Chris@16: {
Chris@101:     resolve_variant::reverse<Geometry>::apply(geometry);
Chris@16: }
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP