187 lines
4.5 KiB
C++
187 lines
4.5 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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// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
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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_REVERSE_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
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#include <algorithm>
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#include <boost/range.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
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#include <boost/geometry/algorithms/detail/multi_modify.hpp>
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#include <boost/geometry/core/interior_rings.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/geometries/concepts/check.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 reverse
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{
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struct range_reverse
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{
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template <typename Range>
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static inline void apply(Range& range)
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{
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std::reverse(boost::begin(range), boost::end(range));
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}
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};
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struct polygon_reverse: private range_reverse
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{
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template <typename Polygon>
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static inline void apply(Polygon& polygon)
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{
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range_reverse::apply(exterior_ring(polygon));
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typename interior_return_type<Polygon>::type
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rings = interior_rings(polygon);
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for (typename detail::interior_iterator<Polygon>::type
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it = boost::begin(rings); it != boost::end(rings); ++it)
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{
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range_reverse::apply(*it);
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}
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}
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};
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}} // namespace detail::reverse
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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 reverse
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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 Ring>
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struct reverse<Ring, ring_tag>
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: detail::reverse::range_reverse
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{};
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template <typename LineString>
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struct reverse<LineString, linestring_tag>
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: detail::reverse::range_reverse
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{};
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template <typename Polygon>
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struct reverse<Polygon, polygon_tag>
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: detail::reverse::polygon_reverse
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{};
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template <typename Geometry>
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struct reverse<Geometry, multi_linestring_tag>
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: detail::multi_modify
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<
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Geometry,
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detail::reverse::range_reverse
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>
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{};
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template <typename Geometry>
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struct reverse<Geometry, multi_polygon_tag>
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: detail::multi_modify
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<
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Geometry,
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detail::reverse::polygon_reverse
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>
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{};
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} // namespace dispatch
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#endif
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namespace resolve_variant
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{
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template <typename Geometry>
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struct reverse
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{
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static void apply(Geometry& geometry)
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{
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concepts::check<Geometry>();
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dispatch::reverse<Geometry>::apply(geometry);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct reverse<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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struct visitor: boost::static_visitor<void>
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{
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template <typename Geometry>
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void operator()(Geometry& geometry) const
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{
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reverse<Geometry>::apply(geometry);
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}
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};
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static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry)
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{
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boost::apply_visitor(visitor(), geometry);
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}
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};
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} // namespace resolve_variant
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/*!
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\brief Reverses the points within a geometry
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\details Generic function to reverse a geometry. It resembles the std::reverse
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functionality, but it takes the geometry type into account. Only for a ring
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or for a linestring it is the same as the std::reverse.
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\ingroup reverse
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry which will be reversed
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\qbk{[include reference/algorithms/reverse.qbk]}
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*/
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template <typename Geometry>
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inline void reverse(Geometry& geometry)
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{
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resolve_variant::reverse<Geometry>::apply(geometry);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
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