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130 lines
3.5 KiB
130 lines
3.5 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_MULTI_ALGORITHMS_DISTANCE_HPP |
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#define BOOST_GEOMETRY_MULTI_ALGORITHMS_DISTANCE_HPP |
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#include <boost/numeric/conversion/bounds.hpp> |
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#include <boost/range.hpp> |
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#include <boost/geometry/multi/core/tags.hpp> |
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#include <boost/geometry/multi/core/geometry_id.hpp> |
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#include <boost/geometry/multi/core/point_type.hpp> |
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#include <boost/geometry/algorithms/distance.hpp> |
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#include <boost/geometry/util/select_coordinate_type.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 distance |
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{ |
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template<typename Geometry, typename MultiGeometry, typename Strategy> |
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struct distance_single_to_multi |
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{ |
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typedef typename strategy::distance::services::return_type<Strategy>::type return_type; |
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static inline return_type apply(Geometry const& geometry, |
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MultiGeometry const& multi, |
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Strategy const& strategy) |
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{ |
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bool first = true; |
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return_type mindist; |
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for(typename range_iterator<MultiGeometry const>::type it = boost::begin(multi); |
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it != boost::end(multi); |
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++it) |
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{ |
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return_type dist = geometry::distance(geometry, *it); |
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if (first || dist < mindist) |
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{ |
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mindist = dist; |
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} |
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first = false; |
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} |
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return mindist; |
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} |
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}; |
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template<typename Multi1, typename Multi2, typename Strategy> |
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struct distance_multi_to_multi |
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{ |
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typedef typename strategy::distance::services::return_type<Strategy>::type return_type; |
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static inline return_type apply(Multi1 const& multi1, |
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Multi2 const& multi2, Strategy const& strategy) |
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{ |
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bool first = true; |
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return_type mindist; |
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for(typename range_iterator<Multi1 const>::type it = boost::begin(multi1); |
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it != boost::end(multi1); |
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++it) |
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{ |
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return_type dist = distance_single_to_multi |
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< |
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typename range_value<Multi1>::type, |
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Multi2, |
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Strategy |
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>::apply(*it, multi2, strategy); |
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if (first || dist < mindist) |
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{ |
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mindist = dist; |
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} |
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first = false; |
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} |
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return mindist; |
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} |
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}; |
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}} // namespace detail::distance |
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#endif |
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#ifndef DOXYGEN_NO_DISPATCH |
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namespace dispatch |
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{ |
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template |
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< |
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typename SingleGeometryTag, |
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typename G1, |
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typename G2, |
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typename Strategy |
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> |
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struct distance<SingleGeometryTag, multi_tag, G1, G2, strategy_tag_distance_point_point, Strategy> |
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: detail::distance::distance_single_to_multi<G1, G2, Strategy> |
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{}; |
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template <typename G1, typename G2, typename Strategy> |
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struct distance<multi_tag, multi_tag, G1, G2, strategy_tag_distance_point_point, Strategy> |
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: detail::distance::distance_multi_to_multi<G1, G2, Strategy> |
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{}; |
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} // namespace dispatch |
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#endif |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_MULTI_ALGORITHMS_DISTANCE_HPP
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