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// Boost.Geometry Index
//
// boxes union/intersection area/volume
//
// Copyright (c) 2011-2018 Adam Wulkiewicz, Lodz, Poland.
//
// This file was modified by Oracle on 2019-2020.
// Modifications copyright (c) 2019-2020 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
//
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
#include <boost/geometry/algorithms/detail/disjoint/box_box.hpp>
#include <boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp>
#include <boost/geometry/index/detail/algorithms/content.hpp>
namespace boost { namespace geometry { namespace index { namespace detail {
// Util to distinguish between default and non-default index strategy
template <typename Box, typename Strategy>
inline bool disjoint_box_box(Box const& box1, Box const& box2, Strategy const& s)
{
return geometry::detail::disjoint::disjoint_box_box(box1, box2, s);
}
template <typename Box>
inline bool disjoint_box_box(Box const& box1, Box const& box2, default_strategy const& )
{
typedef typename strategy::disjoint::services::default_strategy<Box, Box>::type strategy_type;
return geometry::detail::disjoint::disjoint_box_box(box1, box2, strategy_type());
}
/**
* \brief Compute the area, volume, ... of the intersection of b1 and b2
*/
template <typename Box, typename Strategy>
inline typename default_content_result<Box>::type intersection_content(Box const& box1, Box const& box2, Strategy const& strategy)
{
bool const intersects = ! index::detail::disjoint_box_box(box1, box2, strategy);
// NOTE: the code below may be inconsistent with the disjoint_box_box()
// however intersection_box_box checks if the boxes intersect on the fly so it should be ok
// but this also means that disjoint_box_box() is probably not needed
if ( intersects )
{
Box box_intersection;
bool const ok = geometry::detail::intersection::intersection_box_box
<
0, geometry::dimension<Box>::value
>::apply(box1, box2, 0, box_intersection, 0);
if ( ok )
{
return index::detail::content(box_intersection);
}
}
return 0;
}
template <typename Box>
inline typename default_content_result<Box>::type intersection_content(Box const& box1, Box const& box2)
{
return intersection_content(box1, box2, default_strategy());
}
}}}} // namespace boost::geometry::index::detail
#endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
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