126 lines
2.9 KiB
C++
126 lines
2.9 KiB
C++
// 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.
|
|
|
|
// 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_REVERSE_HPP
|
|
#define BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
|
|
|
|
#include <algorithm>
|
|
|
|
#include <boost/range.hpp>
|
|
#include <boost/typeof/typeof.hpp>
|
|
|
|
#include <boost/geometry/core/interior_rings.hpp>
|
|
#include <boost/geometry/geometries/concepts/check.hpp>
|
|
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
|
|
#ifndef DOXYGEN_NO_DETAIL
|
|
namespace detail { namespace reverse
|
|
{
|
|
|
|
|
|
struct range_reverse
|
|
{
|
|
template <typename Range>
|
|
static inline void apply(Range& range)
|
|
{
|
|
std::reverse(boost::begin(range), boost::end(range));
|
|
}
|
|
};
|
|
|
|
|
|
struct polygon_reverse: private range_reverse
|
|
{
|
|
template <typename Polygon>
|
|
static inline void apply(Polygon& polygon)
|
|
{
|
|
typedef typename geometry::ring_type<Polygon>::type ring_type;
|
|
|
|
range_reverse::apply(exterior_ring(polygon));
|
|
|
|
typename interior_return_type<Polygon>::type rings
|
|
= interior_rings(polygon);
|
|
for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
|
|
{
|
|
range_reverse::apply(*it);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
}} // namespace detail::reverse
|
|
#endif // DOXYGEN_NO_DETAIL
|
|
|
|
|
|
#ifndef DOXYGEN_NO_DISPATCH
|
|
namespace dispatch
|
|
{
|
|
|
|
|
|
template <typename Geometry, typename Tag = typename tag<Geometry>::type>
|
|
struct reverse
|
|
{
|
|
static inline void apply(Geometry&)
|
|
{}
|
|
};
|
|
|
|
|
|
template <typename Ring>
|
|
struct reverse<Ring, ring_tag>
|
|
: detail::reverse::range_reverse
|
|
{};
|
|
|
|
|
|
template <typename LineString>
|
|
struct reverse<LineString, linestring_tag>
|
|
: detail::reverse::range_reverse
|
|
{};
|
|
|
|
|
|
template <typename Polygon>
|
|
struct reverse<Polygon, polygon_tag>
|
|
: detail::reverse::polygon_reverse
|
|
{};
|
|
|
|
|
|
} // namespace dispatch
|
|
#endif
|
|
|
|
|
|
/*!
|
|
\brief Reverses the points within a geometry
|
|
\details Generic function to reverse a geometry. It resembles the std::reverse
|
|
functionality, but it takes the geometry type into account. Only for a ring
|
|
or for a linestring it is the same as the std::reverse.
|
|
\ingroup reverse
|
|
\tparam Geometry \tparam_geometry
|
|
\param geometry \param_geometry which will be reversed
|
|
|
|
\qbk{[include reference/algorithms/reverse.qbk]}
|
|
*/
|
|
template <typename Geometry>
|
|
inline void reverse(Geometry& geometry)
|
|
{
|
|
concept::check<Geometry>();
|
|
|
|
dispatch::reverse<Geometry>::apply(geometry);
|
|
}
|
|
|
|
}} // namespace boost::geometry
|
|
|
|
|
|
#endif // BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP
|