320 lines
8.7 KiB
C++
320 lines
8.7 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, 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_INTERSECTION_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_INTERSECTION_HPP
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/algorithms/detail/overlay/intersection_insert.hpp>
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#include <boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp>
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#include <boost/geometry/algorithms/intersects.hpp>
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#include <boost/geometry/policies/robustness/get_rescale_policy.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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// By default, all is forwarded to the intersection_insert-dispatcher
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template
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<
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typename Geometry1, typename Geometry2,
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typename Tag1 = typename geometry::tag<Geometry1>::type,
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typename Tag2 = typename geometry::tag<Geometry2>::type,
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bool Reverse = reverse_dispatch<Geometry1, Geometry2>::type::value
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>
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struct intersection
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{
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template <typename RobustPolicy, typename GeometryOut, typename Strategy>
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static inline bool apply(Geometry1 const& geometry1,
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Geometry2 const& geometry2,
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RobustPolicy const& robust_policy,
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GeometryOut& geometry_out,
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Strategy const& strategy)
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{
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typedef typename boost::range_value<GeometryOut>::type OneOut;
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intersection_insert
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<
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Geometry1, Geometry2, OneOut,
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overlay_intersection
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>::apply(geometry1, geometry2, robust_policy, std::back_inserter(geometry_out), strategy);
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return true;
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}
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};
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// If reversal is needed, perform it
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template
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<
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typename Geometry1, typename Geometry2,
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typename Tag1, typename Tag2
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>
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struct intersection
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<
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Geometry1, Geometry2,
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Tag1, Tag2,
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true
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>
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: intersection<Geometry2, Geometry1, Tag2, Tag1, false>
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{
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template <typename RobustPolicy, typename GeometryOut, typename Strategy>
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static inline bool apply(
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Geometry1 const& g1,
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Geometry2 const& g2,
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RobustPolicy const& robust_policy,
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GeometryOut& out,
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Strategy const& strategy)
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{
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return intersection<
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Geometry2, Geometry1,
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Tag2, Tag1,
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false
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>::apply(g2, g1, robust_policy, out, strategy);
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}
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};
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template
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<
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typename Box1, typename Box2, bool Reverse
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>
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struct intersection
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<
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Box1, Box2,
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box_tag, box_tag,
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Reverse
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> : public detail::intersection::intersection_box_box
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<
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0, geometry::dimension<Box1>::value
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>
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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namespace resolve_variant
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{
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template <typename Geometry1, typename Geometry2>
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struct intersection
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{
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template <typename GeometryOut>
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static inline bool
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apply(
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const Geometry1& geometry1,
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const Geometry2& geometry2,
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GeometryOut& geometry_out)
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{
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concept::check<Geometry1 const>();
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concept::check<Geometry2 const>();
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typedef typename geometry::rescale_overlay_policy_type
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<
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Geometry1,
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Geometry2
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>::type rescale_policy_type;
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rescale_policy_type robust_policy
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= geometry::get_rescale_policy<rescale_policy_type>(geometry1, geometry2);
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typedef strategy_intersection
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<
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typename cs_tag<Geometry1>::type,
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Geometry1,
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Geometry2,
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typename geometry::point_type<Geometry1>::type,
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rescale_policy_type
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> strategy;
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return dispatch::intersection
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<
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Geometry1,
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Geometry2
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>::apply(geometry1, geometry2, robust_policy, geometry_out, strategy());
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2>
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struct intersection<variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Geometry2>
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{
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template <typename GeometryOut>
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struct visitor: static_visitor<bool>
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{
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Geometry2 const& m_geometry2;
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GeometryOut& m_geometry_out;
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visitor(Geometry2 const& geometry2,
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GeometryOut& geometry_out)
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: m_geometry2(geometry2),
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m_geometry_out(geometry_out)
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{}
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template <typename Geometry1>
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result_type operator()(Geometry1 const& geometry1) const
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{
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return intersection
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<
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Geometry1,
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Geometry2
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>::template apply
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<
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GeometryOut
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>
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(geometry1, m_geometry2, m_geometry_out);
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}
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};
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template <typename GeometryOut>
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static inline bool
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apply(variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1,
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Geometry2 const& geometry2,
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GeometryOut& geometry_out)
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{
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return apply_visitor(visitor<GeometryOut>(geometry2, geometry_out), geometry1);
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}
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};
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template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct intersection<Geometry1, variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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template <typename GeometryOut>
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struct visitor: static_visitor<bool>
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{
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Geometry1 const& m_geometry1;
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GeometryOut& m_geometry_out;
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visitor(Geometry1 const& geometry1,
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GeometryOut& geometry_out)
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: m_geometry1(geometry1),
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m_geometry_out(geometry_out)
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{}
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template <typename Geometry2>
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result_type operator()(Geometry2 const& geometry2) const
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{
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return intersection
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<
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Geometry1,
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Geometry2
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>::template apply
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<
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GeometryOut
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>
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(m_geometry1, geometry2, m_geometry_out);
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}
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};
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template <typename GeometryOut>
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static inline bool
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apply(
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Geometry1 const& geometry1,
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const variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry2,
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GeometryOut& geometry_out)
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{
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return apply_visitor(visitor<GeometryOut>(geometry1, geometry_out), geometry2);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename A), BOOST_VARIANT_ENUM_PARAMS(typename B)>
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struct intersection<variant<BOOST_VARIANT_ENUM_PARAMS(A)>, variant<BOOST_VARIANT_ENUM_PARAMS(B)> >
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{
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template <typename GeometryOut>
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struct visitor: static_visitor<bool>
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{
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GeometryOut& m_geometry_out;
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visitor(GeometryOut& geometry_out)
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: m_geometry_out(geometry_out)
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{}
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template <typename Geometry1, typename Geometry2>
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result_type operator()(
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Geometry1 const& geometry1,
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Geometry2 const& geometry2) const
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{
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return intersection
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<
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Geometry1,
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Geometry2
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>::template apply
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<
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GeometryOut
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>
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(geometry1, geometry2, m_geometry_out);
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}
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};
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template <typename GeometryOut>
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static inline bool
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apply(
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const variant<BOOST_VARIANT_ENUM_PARAMS(A)>& geometry1,
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const variant<BOOST_VARIANT_ENUM_PARAMS(B)>& geometry2,
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GeometryOut& geometry_out)
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{
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return apply_visitor(visitor<GeometryOut>(geometry_out), geometry1, geometry2);
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}
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};
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} // namespace resolve_variant
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/*!
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\brief \brief_calc2{intersection}
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\ingroup intersection
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\details \details_calc2{intersection, spatial set theoretic intersection}.
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\tparam Geometry1 \tparam_geometry
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\tparam Geometry2 \tparam_geometry
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\tparam GeometryOut Collection of geometries (e.g. std::vector, std::deque, boost::geometry::multi*) of which
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the value_type fulfills a \p_l_or_c concept, or it is the output geometry (e.g. for a box)
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\param geometry1 \param_geometry
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\param geometry2 \param_geometry
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\param geometry_out The output geometry, either a multi_point, multi_polygon,
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multi_linestring, or a box (for intersection of two boxes)
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\qbk{[include reference/algorithms/intersection.qbk]}
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*/
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template
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<
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typename Geometry1,
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typename Geometry2,
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typename GeometryOut
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>
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inline bool intersection(Geometry1 const& geometry1,
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Geometry2 const& geometry2,
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GeometryOut& geometry_out)
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{
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return resolve_variant::intersection
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<
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Geometry1,
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Geometry2
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>::template apply
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<
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GeometryOut
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>
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(geometry1, geometry2, geometry_out);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_INTERSECTION_HPP
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