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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2014, Oracle and/or its affiliates.
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html
#ifndef BOOST_GEOMETRY_ITERATORS_SEGMENT_ITERATOR_HPP
#define BOOST_GEOMETRY_ITERATORS_SEGMENT_ITERATOR_HPP
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/range.hpp>
#include <boost/geometry/core/exterior_ring.hpp>
#include <boost/geometry/core/interior_rings.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/iterators/detail/point_iterator/inner_range_type.hpp>
#include <boost/geometry/iterators/detail/segment_iterator/iterator_type.hpp>
#include <boost/geometry/iterators/dispatch/segment_iterator.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
// specializations for segments_begin
template <typename Linestring>
struct segments_begin<Linestring, linestring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
Linestring
>::type return_type;
static inline return_type apply(Linestring& linestring)
{
return return_type(linestring);
}
};
template <typename Ring>
struct segments_begin<Ring, ring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
Ring
>::type return_type;
static inline return_type apply(Ring& ring)
{
return return_type(ring);
}
};
template <typename Polygon>
struct segments_begin<Polygon, polygon_tag>
{
typedef typename detail::point_iterator::inner_range_type
<
Polygon
>::type inner_range;
typedef typename detail::segment_iterator::iterator_type
<
Polygon
>::type return_type;
static inline return_type apply(Polygon& polygon)
{
typedef typename return_type::second_iterator_type flatten_iterator;
return return_type
(segments_begin
<
inner_range
>::apply(geometry::exterior_ring(polygon)),
segments_end
<
inner_range
>::apply(geometry::exterior_ring(polygon)),
flatten_iterator(boost::begin(geometry::interior_rings(polygon)),
boost::end(geometry::interior_rings(polygon))
),
flatten_iterator(boost::begin(geometry::interior_rings(polygon)),
boost::end(geometry::interior_rings(polygon))
)
);
}
};
template <typename MultiLinestring>
struct segments_begin<MultiLinestring, multi_linestring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
MultiLinestring
>::type return_type;
static inline return_type apply(MultiLinestring& multilinestring)
{
return return_type(boost::begin(multilinestring),
boost::end(multilinestring));
}
};
template <typename MultiPolygon>
struct segments_begin<MultiPolygon, multi_polygon_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
MultiPolygon
>::type return_type;
static inline return_type apply(MultiPolygon& multipolygon)
{
return return_type(boost::begin(multipolygon),
boost::end(multipolygon));
}
};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
// specializations for segments_end
template <typename Linestring>
struct segments_end<Linestring, linestring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
Linestring
>::type return_type;
static inline return_type apply(Linestring& linestring)
{
return return_type(linestring, true);
}
};
template <typename Ring>
struct segments_end<Ring, ring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
Ring
>::type return_type;
static inline return_type apply(Ring& ring)
{
return return_type(ring, true);
}
};
template <typename Polygon>
struct segments_end<Polygon, polygon_tag>
{
typedef typename detail::point_iterator::inner_range_type
<
Polygon
>::type inner_range;
typedef typename detail::segment_iterator::iterator_type
<
Polygon
>::type return_type;
static inline return_type apply(Polygon& polygon)
{
typedef typename return_type::second_iterator_type flatten_iterator;
return return_type
(segments_end
<
inner_range
>::apply(geometry::exterior_ring(polygon)),
flatten_iterator(boost::begin(geometry::interior_rings(polygon)),
boost::end(geometry::interior_rings(polygon))
),
flatten_iterator( boost::end(geometry::interior_rings(polygon)) )
);
}
};
template <typename MultiLinestring>
struct segments_end<MultiLinestring, multi_linestring_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
MultiLinestring
>::type return_type;
static inline return_type apply(MultiLinestring& multilinestring)
{
return return_type(boost::end(multilinestring));
}
};
template <typename MultiPolygon>
struct segments_end<MultiPolygon, multi_polygon_tag>
{
typedef typename detail::segment_iterator::iterator_type
<
MultiPolygon
>::type return_type;
static inline return_type apply(MultiPolygon& multipolygon)
{
return return_type(boost::end(multipolygon));
}
};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
// MK:: need to add doc here
template <typename Geometry>
class segment_iterator
: public detail::segment_iterator::iterator_type<Geometry>::type
{
private:
typedef typename detail::segment_iterator::iterator_type
<
Geometry
>::type base;
inline base const* base_ptr() const
{
return this;
}
template <typename OtherGeometry> friend class segment_iterator;
template <typename G>
friend inline segment_iterator<G const> segments_begin(G const&);
template <typename G>
friend inline segment_iterator<G const> segments_end(G const&);
inline segment_iterator(base const& base_it) : base(base_it) {}
public:
inline segment_iterator() {}
template <typename OtherGeometry>
inline segment_iterator(segment_iterator<OtherGeometry> const& other)
: base(*other.base_ptr())
{
static const bool is_conv
= boost::is_convertible<
typename detail::segment_iterator::iterator_type
<
OtherGeometry
>::type,
typename detail::segment_iterator::iterator_type<Geometry>::type
>::value;
BOOST_MPL_ASSERT_MSG((is_conv),
NOT_CONVERTIBLE,
(segment_iterator<OtherGeometry>));
}
};
// MK:: need to add doc here
template <typename Geometry>
inline segment_iterator<Geometry const>
segments_begin(Geometry const& geometry)
{
return dispatch::segments_begin<Geometry const>::apply(geometry);
}
// MK:: need to add doc here
template <typename Geometry>
inline segment_iterator<Geometry const>
segments_end(Geometry const& geometry)
{
return dispatch::segments_end<Geometry const>::apply(geometry);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ITERATORS_SEGMENT_ITERATOR_HPP
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