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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2010-2012 Barend Gehrels, 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_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
- #define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
- // Adapts Geometries from Boost.Polygon for usage in Boost.Geometry
- // boost::polygon::polygon_with_holes_data -> boost::geometry::polygon
- // hole_iterator -> returning ring_proxy's instead of normal polygon_data
- #include <boost/polygon/polygon.hpp>
- #include <boost/iterator/iterator_facade.hpp>
- namespace boost { namespace geometry
- {
- namespace adapt { namespace bp
- {
- template <typename Polygon, typename RingProxy>
- class hole_iterator
- : public ::boost::iterator_facade
- <
- hole_iterator<Polygon, RingProxy>,
- RingProxy, // value type
- boost::forward_traversal_tag,
- RingProxy // reference type
- >
- {
- public :
- typedef typename boost::polygon::polygon_with_holes_traits
- <
- Polygon
- >::iterator_holes_type ith_type;
- explicit inline hole_iterator(Polygon& polygon, ith_type const it)
- : m_polygon(polygon)
- , m_base(it)
- {
- }
- typedef std::ptrdiff_t difference_type;
- private:
- friend class boost::iterator_core_access;
- inline RingProxy dereference() const
- {
- return RingProxy(m_polygon, this->m_base);
- }
- inline void increment() { ++m_base; }
- inline void decrement() { --m_base; }
- inline void advance(difference_type n)
- {
- for (int i = 0; i < n; i++)
- {
- ++m_base;
- }
- }
- inline bool equal(hole_iterator<Polygon, RingProxy> const& other) const
- {
- return this->m_base == other.m_base;
- }
- Polygon& m_polygon;
- ith_type m_base;
- };
- }}}}
- #endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
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