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134 lines
3.0 KiB
134 lines
3.0 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 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_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/typeof/typeof.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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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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template <typename Range> |
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struct range_reverse |
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{ |
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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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template <typename Polygon> |
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struct polygon_reverse |
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{ |
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static inline void apply(Polygon& polygon) |
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{ |
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typedef typename geometry::ring_type<Polygon>::type ring_type; |
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typedef range_reverse<ring_type> per_range; |
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per_range::apply(exterior_ring(polygon)); |
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typename interior_return_type<Polygon>::type rings |
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= interior_rings(polygon); |
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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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per_range::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 |
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< |
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typename Tag, |
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typename Geometry |
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> |
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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_tag, Ring> |
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: detail::reverse::range_reverse<Ring> |
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{}; |
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template <typename LineString> |
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struct reverse<linestring_tag, LineString> |
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: detail::reverse::range_reverse<LineString> |
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{}; |
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template <typename Polygon> |
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struct reverse<polygon_tag, Polygon> |
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: detail::reverse::polygon_reverse<Polygon> |
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{}; |
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} // namespace dispatch |
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#endif |
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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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concept::check<Geometry>(); |
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dispatch::reverse |
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< |
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typename tag<Geometry>::type, |
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Geometry |
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>::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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