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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
// This file was modified by Oracle on 2014, 2015, 2017.
// Modifications copyright (c) 2014-2017 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
// 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_ALGORITHMS_DETAIL_OVERLAPS_IMPLEMENTATION_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAPS_IMPLEMENTATION_HPP
#include <cstddef>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/algorithms/not_implemented.hpp>
#include <boost/geometry/geometries/concepts/check.hpp>
#include <boost/geometry/algorithms/relate.hpp>
#include <boost/geometry/algorithms/detail/overlaps/interface.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlaps
{
template
<
std::size_t Dimension,
std::size_t DimensionCount
>
struct box_box_loop
{
template <typename Box1, typename Box2>
static inline void apply(Box1 const& b1, Box2 const& b2,
bool& overlaps, bool& one_in_two, bool& two_in_one)
{
assert_dimension_equal<Box1, Box2>();
typedef typename coordinate_type<Box1>::type coordinate_type1;
typedef typename coordinate_type<Box2>::type coordinate_type2;
coordinate_type1 const& min1 = get<min_corner, Dimension>(b1);
coordinate_type1 const& max1 = get<max_corner, Dimension>(b1);
coordinate_type2 const& min2 = get<min_corner, Dimension>(b2);
coordinate_type2 const& max2 = get<max_corner, Dimension>(b2);
// We might use the (not yet accepted) Boost.Interval
// submission in the future
// If:
// B1: |-------|
// B2: |------|
// in any dimension -> no overlap
if (max1 <= min2 || min1 >= max2)
{
overlaps = false;
return;
}
// If:
// B1: |--------------------|
// B2: |-------------|
// in all dimensions -> within, then no overlap
// B1: |--------------------|
// B2: |-------------|
// this is "within-touch" -> then no overlap. So use < and >
if (min1 < min2 || max1 > max2)
{
one_in_two = false;
}
// Same other way round
if (min2 < min1 || max2 > max1)
{
two_in_one = false;
}
box_box_loop
<
Dimension + 1,
DimensionCount
>::apply(b1, b2, overlaps, one_in_two, two_in_one);
}
};
template
<
std::size_t DimensionCount
>
struct box_box_loop<DimensionCount, DimensionCount>
{
template <typename Box1, typename Box2>
static inline void apply(Box1 const& , Box2 const&, bool&, bool&, bool&)
{
}
};
struct box_box
{
template <typename Box1, typename Box2, typename Strategy>
static inline bool apply(Box1 const& b1, Box2 const& b2, Strategy const& /*strategy*/)
{
bool overlaps = true;
bool within1 = true;
bool within2 = true;
box_box_loop
<
0,
dimension<Box1>::type::value
>::apply(b1, b2, overlaps, within1, within2);
/*
\see http://docs.codehaus.org/display/GEOTDOC/02+Geometry+Relationships#02GeometryRelationships-Overlaps
where is stated that "inside" is not an "overlap",
this is true and is implemented as such.
*/
return overlaps && ! within1 && ! within2;
}
};
}} // namespace detail::overlaps
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template <typename Box1, typename Box2>
struct overlaps<Box1, Box2, box_tag, box_tag>
: detail::overlaps::box_box
{};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAPS_IMPLEMENTATION_HPP
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