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171 lines
4.4 KiB
171 lines
4.4 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_NUM_POINTS_HPP |
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#define BOOST_GEOMETRY_ALGORITHMS_NUM_POINTS_HPP |
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#include <cstddef> |
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#include <boost/mpl/assert.hpp> |
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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/closure.hpp> |
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#include <boost/geometry/core/exterior_ring.hpp> |
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#include <boost/geometry/core/interior_rings.hpp> |
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#include <boost/geometry/core/ring_type.hpp> |
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#include <boost/geometry/core/tag_cast.hpp> |
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#include <boost/geometry/algorithms/disjoint.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 num_points |
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{ |
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template <typename Range> |
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struct range_count |
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{ |
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static inline std::size_t apply(Range const& range, bool add_for_open) |
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{ |
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std::size_t n = boost::size(range); |
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if (add_for_open && n > 0) |
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{ |
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closure_selector const s = geometry::closure<Range>::value; |
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if (s == open) |
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{ |
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if (geometry::disjoint(*boost::begin(range), *(boost::begin(range) + n - 1))) |
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{ |
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return n + 1; |
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} |
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} |
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} |
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return n; |
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} |
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}; |
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template <typename Geometry, std::size_t D> |
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struct other_count |
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{ |
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static inline std::size_t apply(Geometry const&, bool) |
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{ |
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return D; |
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} |
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}; |
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template <typename Polygon> |
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struct polygon_count |
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{ |
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static inline std::size_t apply(Polygon const& poly, bool add_for_open) |
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{ |
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typedef typename geometry::ring_type<Polygon>::type ring_type; |
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std::size_t n = range_count<ring_type>::apply( |
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exterior_ring(poly), add_for_open); |
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typename interior_return_type<Polygon const>::type rings |
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= interior_rings(poly); |
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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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n += range_count<ring_type>::apply(*it, add_for_open); |
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} |
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return n; |
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} |
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}; |
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}} // namespace detail::num_points |
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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 GeometryTag, typename Geometry> |
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struct num_points |
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{ |
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BOOST_MPL_ASSERT_MSG |
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( |
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false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE |
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, (types<Geometry>) |
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); |
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}; |
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template <typename Geometry> |
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struct num_points<point_tag, Geometry> |
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: detail::num_points::other_count<Geometry, 1> |
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{}; |
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template <typename Geometry> |
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struct num_points<box_tag, Geometry> |
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: detail::num_points::other_count<Geometry, 4> |
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{}; |
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template <typename Geometry> |
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struct num_points<segment_tag, Geometry> |
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: detail::num_points::other_count<Geometry, 2> |
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{}; |
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template <typename Geometry> |
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struct num_points<linestring_tag, Geometry> |
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: detail::num_points::range_count<Geometry> |
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{}; |
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template <typename Geometry> |
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struct num_points<ring_tag, Geometry> |
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: detail::num_points::range_count<Geometry> |
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{}; |
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template <typename Geometry> |
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struct num_points<polygon_tag, Geometry> |
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: detail::num_points::polygon_count<Geometry> |
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{}; |
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} // namespace dispatch |
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#endif |
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/*! |
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\brief \brief_calc{number of points} |
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\ingroup num_points |
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\details \details_calc{num_points, number of points}. |
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\tparam Geometry \tparam_geometry |
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\param geometry \param_geometry |
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\param add_for_open add one for open geometries (i.e. polygon types which are not closed) |
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\return \return_calc{number of points} |
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\qbk{[include reference/algorithms/num_points.qbk]} |
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*/ |
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template <typename Geometry> |
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inline std::size_t num_points(Geometry const& geometry, bool add_for_open = false) |
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{ |
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concept::check<Geometry const>(); |
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return dispatch::num_points |
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< |
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typename tag_cast<typename tag<Geometry>::type, multi_tag>::type, |
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Geometry |
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>::apply(geometry, add_for_open); |
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} |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_ALGORITHMS_NUM_POINTS_HPP
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