diff --git a/include/boost/geometry/algorithms/distance.hpp b/include/boost/geometry/algorithms/distance.hpp index 953be2361..8f5ececdf 100644 --- a/include/boost/geometry/algorithms/distance.hpp +++ b/include/boost/geometry/algorithms/distance.hpp @@ -20,266 +20,49 @@ #ifndef BOOST_GEOMETRY_ALGORITHMS_DISTANCE_HPP #define BOOST_GEOMETRY_ALGORITHMS_DISTANCE_HPP - #include #include #include #include +#include + #include #include +#include #include #include #include #include -#include #include #include #include -#include -#include +#include -#include -#include +#include + +#include +#include +#include +#include + +#include + +#include namespace boost { namespace geometry { -#ifndef DOXYGEN_NO_DETAIL -namespace detail { namespace distance -{ - -// To avoid spurious namespaces here: -using strategy::distance::services::return_type; - -template -struct point_to_point -{ - static inline typename return_type::type - apply(P1 const& p1, P2 const& p2, Strategy const& strategy) - { - boost::ignore_unused_variable_warning(strategy); - return strategy.apply(p1, p2); - } -}; - - -template -struct point_to_segment -{ - static inline typename return_type::type>::type - apply(Point const& point, Segment const& segment, Strategy const& ) - { - typename strategy::distance::services::default_strategy - < - segment_tag, - Point, - typename point_type::type, - typename cs_tag::type, - typename cs_tag::type>::type, - Strategy - >::type segment_strategy; - - typename point_type::type p[2]; - geometry::detail::assign_point_from_index<0>(segment, p[0]); - geometry::detail::assign_point_from_index<1>(segment, p[1]); - return segment_strategy.apply(point, p[0], p[1]); - } -}; - - -template -< - typename Point, - typename Range, - closure_selector Closure, - typename PPStrategy, - typename PSStrategy -> -struct point_to_range -{ - typedef typename return_type::type>::type return_type; - - static inline return_type apply(Point const& point, Range const& range, - PPStrategy const& pp_strategy, PSStrategy const& ps_strategy) - { - return_type const zero = return_type(0); - - if (boost::size(range) == 0) - { - return zero; - } - - typedef typename closeable_view::type view_type; - - view_type view(range); - - // line of one point: return point distance - typedef typename boost::range_iterator::type iterator_type; - iterator_type it = boost::begin(view); - iterator_type prev = it++; - if (it == boost::end(view)) - { - return pp_strategy.apply(point, *boost::begin(view)); - } - - // Create comparable (more efficient) strategy - typedef typename strategy::distance::services::comparable_type::type eps_strategy_type; - eps_strategy_type eps_strategy = strategy::distance::services::get_comparable::apply(ps_strategy); - - // start with first segment distance - return_type d = eps_strategy.apply(point, *prev, *it); - return_type rd = ps_strategy.apply(point, *prev, *it); - - // check if other segments are closer - for (++prev, ++it; it != boost::end(view); ++prev, ++it) - { - return_type const ds = eps_strategy.apply(point, *prev, *it); - if (geometry::math::equals(ds, zero)) - { - return ds; - } - else if (ds < d) - { - d = ds; - rd = ps_strategy.apply(point, *prev, *it); - } - } - - return rd; - } -}; - - -template -< - typename Point, - typename Ring, - closure_selector Closure, - typename PPStrategy, - typename PSStrategy -> -struct point_to_ring -{ - typedef std::pair - < - typename return_type::type>::type, bool - > distance_containment; - - static inline distance_containment apply(Point const& point, - Ring const& ring, - PPStrategy const& pp_strategy, PSStrategy const& ps_strategy) - { - return distance_containment - ( - point_to_range - < - Point, - Ring, - Closure, - PPStrategy, - PSStrategy - >::apply(point, ring, pp_strategy, ps_strategy), - geometry::within(point, ring) - ); - } -}; - - - -template -< - typename Point, - typename Polygon, - closure_selector Closure, - typename PPStrategy, - typename PSStrategy -> -struct point_to_polygon -{ - typedef typename return_type::type>::type return_type; - typedef std::pair distance_containment; - - static inline distance_containment apply(Point const& point, - Polygon const& polygon, - PPStrategy const& pp_strategy, PSStrategy const& ps_strategy) - { - // Check distance to all rings - typedef point_to_ring - < - Point, - typename ring_type::type, - Closure, - PPStrategy, - PSStrategy - > per_ring; - - distance_containment dc = per_ring::apply(point, - exterior_ring(polygon), pp_strategy, ps_strategy); - - typename interior_return_type::type rings - = interior_rings(polygon); - for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it) - { - distance_containment dcr = per_ring::apply(point, - *it, pp_strategy, ps_strategy); - if (dcr.first < dc.first) - { - dc.first = dcr.first; - } - // If it was inside, and also inside inner ring, - // turn off the inside-flag, it is outside the polygon - if (dc.second && dcr.second) - { - dc.second = false; - } - } - return dc; - } -}; - - -// Helper metafunction for default strategy retrieval -template -struct default_strategy - : strategy::distance::services::default_strategy - < - point_tag, - typename point_type::type, - typename point_type::type - > -{}; - - -}} // namespace detail::distance -#endif // DOXYGEN_NO_DETAIL - #ifndef DOXYGEN_NO_DISPATCH namespace dispatch { -using strategy::distance::services::return_type; - - -template -< - typename Geometry1, typename Geometry2, - typename Strategy = typename detail::distance::default_strategy::type, - typename Tag1 = typename tag_cast::type, multi_tag>::type, - typename Tag2 = typename tag_cast::type, multi_tag>::type, - typename StrategyTag = typename strategy::distance::services::tag::type, - bool Reverse = reverse_dispatch::type::value -> -struct distance: not_implemented -{}; - - // If reversal is needed, perform it template < @@ -316,184 +99,6 @@ struct distance }; -// Point-point -template -struct distance - < - P1, P2, Strategy, - point_tag, point_tag, strategy_tag_distance_point_point, - false - > - : detail::distance::point_to_point -{}; - - -// Point-line version 1, where point-point strategy is specified -template -struct distance -< - Point, Linestring, Strategy, - point_tag, linestring_tag, strategy_tag_distance_point_point, - false -> -{ - - static inline typename return_type::type>::type - apply(Point const& point, - Linestring const& linestring, - Strategy const& strategy) - { - typedef typename strategy::distance::services::default_strategy - < - segment_tag, - Point, - typename point_type::type, - typename cs_tag::type, - typename cs_tag::type>::type, - Strategy - >::type ps_strategy_type; - - return detail::distance::point_to_range - < - Point, Linestring, closed, Strategy, ps_strategy_type - >::apply(point, linestring, strategy, ps_strategy_type()); - } -}; - - -// Point-line version 2, where point-segment strategy is specified -template -struct distance -< - Point, Linestring, Strategy, - point_tag, linestring_tag, strategy_tag_distance_point_segment, - false -> -{ - static inline typename return_type::type>::type - apply(Point const& point, - Linestring const& linestring, - Strategy const& strategy) - { - typedef typename strategy::distance::services::strategy_point_point::type pp_strategy_type; - return detail::distance::point_to_range - < - Point, Linestring, closed, pp_strategy_type, Strategy - >::apply(point, linestring, pp_strategy_type(), strategy); - } -}; - -// Point-ring , where point-segment strategy is specified -template -struct distance -< - Point, Ring, Strategy, - point_tag, ring_tag, strategy_tag_distance_point_point, - false -> -{ - typedef typename return_type::type>::type return_type; - - static inline return_type apply(Point const& point, - Ring const& ring, - Strategy const& strategy) - { - typedef typename strategy::distance::services::default_strategy - < - segment_tag, - Point, - typename point_type::type, - typename cs_tag::type, - typename cs_tag::type>::type, - Strategy - >::type ps_strategy_type; - - std::pair - dc = detail::distance::point_to_ring - < - Point, Ring, - geometry::closure::value, - Strategy, ps_strategy_type - >::apply(point, ring, strategy, ps_strategy_type()); - - return dc.second ? return_type(0) : dc.first; - } -}; - - -// Point-polygon , where point-segment strategy is specified -template -struct distance -< - Point, Polygon, Strategy, - point_tag, polygon_tag, strategy_tag_distance_point_point, - false -> -{ - typedef typename return_type::type>::type return_type; - - static inline return_type apply(Point const& point, - Polygon const& polygon, - Strategy const& strategy) - { - typedef typename strategy::distance::services::default_strategy - < - segment_tag, - Point, - typename point_type::type, - typename cs_tag::type, - typename cs_tag::type>::type, - Strategy - >::type ps_strategy_type; - - std::pair - dc = detail::distance::point_to_polygon - < - Point, Polygon, - geometry::closure::value, - Strategy, ps_strategy_type - >::apply(point, polygon, strategy, ps_strategy_type()); - - return dc.second ? return_type(0) : dc.first; - } -}; - - - -// Point-segment version 1, with point-point strategy -template -struct distance -< - Point, Segment, Strategy, - point_tag, segment_tag, strategy_tag_distance_point_point, - false -> : detail::distance::point_to_segment -{}; - -// Point-segment version 2, with point-segment strategy -template -struct distance -< - Point, Segment, Strategy, - point_tag, segment_tag, strategy_tag_distance_point_segment, - false -> -{ - static inline typename return_type::type>::type - apply(Point const& point, - Segment const& segment, - Strategy const& strategy) - { - - typename point_type::type p[2]; - geometry::detail::assign_point_from_index<0>(segment, p[0]); - geometry::detail::assign_point_from_index<1>(segment, p[1]); - return strategy.apply(point, p[0], p[1]); - } -}; - - - } // namespace dispatch #endif // DOXYGEN_NO_DISPATCH @@ -578,10 +183,41 @@ inline typename default_distance_result::type distance( concept::check(); concept::check(); - return distance(geometry1, geometry2, - typename detail::distance::default_strategy::type()); + typedef typename boost::mpl::if_c + < + geometry::reverse_dispatch::type::value, + typename detail::distance::default_strategy + < + Geometry2, Geometry1 + >::type, + typename detail::distance::default_strategy + < + Geometry1, Geometry2 + >::type + >::type default_strategy_type; + + + return distance(geometry1, geometry2, default_strategy_type()); } }} // namespace boost::geometry + +// the implementation details +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef BOOST_GEOMETRY_SUPPORT_SEGMENT_SEGMENT_DISTANCE +#include +#endif // BOOST_GEOMETRY_SUPPORT_SEGMENT_SEGMENT_DISTANCE + +#include + #endif // BOOST_GEOMETRY_ALGORITHMS_DISTANCE_HPP