ceph/src/boost/libs/geometry/include/boost/geometry/index/detail/algorithms/intersection_content.hpp

   1 // Boost.Geometry Index
   2 //
   3 // boxes union/intersection area/volume
   4 //
   5 // Copyright (c) 2011-2016 Adam Wulkiewicz, Lodz, Poland.
   6 //
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
  12 #define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
  13
  14 #include <boost/geometry/algorithms/intersection.hpp>
  15 #include <boost/geometry/strategies/intersection_strategies.hpp>
  16 #include <boost/geometry/index/detail/algorithms/content.hpp>
  17
  18 namespace boost { namespace geometry { namespace index { namespace detail {
  19
  20 /**
  21  * \brief Compute the area of the intersection of b1 and b2
  22  */
  23 template <typename Box>
  24 inline typename default_content_result<Box>::type intersection_content(Box const& box1, Box const& box2)
  25 {
  26     if ( geometry::intersects(box1, box2) )
  27     {
  28         Box box_intersection;
  29         if ( geometry::intersection(box1, box2, box_intersection) )
  30             return detail::content(box_intersection);
  31     }
  32     return 0;
  33 }
  34
  35 }}}} // namespace boost::geometry::index::detail
  36
  37 #endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP