131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
// 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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