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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2015, Oracle and/or its affiliates.
// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_POINTLIKE_LINEAR_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_POINTLIKE_LINEAR_HPP
#include <iterator>
#include <vector>
#include <boost/range.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/geometries/box.hpp>
#include <boost/geometry/iterators/segment_iterator.hpp>
#include <boost/geometry/algorithms/disjoint.hpp>
#include <boost/geometry/algorithms/envelope.hpp>
#include <boost/geometry/algorithms/expand.hpp>
#include <boost/geometry/algorithms/not_implemented.hpp>
#include <boost/geometry/algorithms/detail/not.hpp>
#include <boost/geometry/algorithms/detail/partition.hpp>
#include <boost/geometry/algorithms/detail/relate/less.hpp>
#include <boost/geometry/algorithms/detail/disjoint/point_geometry.hpp>
#include <boost/geometry/algorithms/detail/equals/point_point.hpp>
#include <boost/geometry/algorithms/detail/overlay/overlay_type.hpp>
#include <boost/geometry/algorithms/detail/overlay/pointlike_pointlike.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay
{
// action struct for pointlike-linear difference/intersection
// it works the same as its pointlike-pointlike counterpart, hence the
// derivation
template <typename PointOut, overlay_type OverlayType>
struct action_selector_pl_l
: action_selector_pl_pl<PointOut, OverlayType>
{};
// difference/intersection of point-linear
template
<
typename Point,
typename Linear,
typename PointOut,
overlay_type OverlayType,
typename Policy
>
struct point_linear_point
{
template <typename RobustPolicy, typename OutputIterator, typename Strategy>
static inline OutputIterator apply(Point const& point,
Linear const& linear,
RobustPolicy const&,
OutputIterator oit,
Strategy const&)
{
action_selector_pl_l
<
PointOut, OverlayType
>::apply(point, Policy::apply(point, linear), oit);
return oit;
}
};
// difference/intersection of multipoint-segment
template
<
typename MultiPoint,
typename Segment,
typename PointOut,
overlay_type OverlayType,
typename Policy
>
struct multipoint_segment_point
{
template <typename RobustPolicy, typename OutputIterator, typename Strategy>
static inline OutputIterator apply(MultiPoint const& multipoint,
Segment const& segment,
RobustPolicy const&,
OutputIterator oit,
Strategy const&)
{
for (typename boost::range_iterator<MultiPoint const>::type
it = boost::begin(multipoint);
it != boost::end(multipoint);
++it)
{
action_selector_pl_l
<
PointOut, OverlayType
>::apply(*it, Policy::apply(*it, segment), oit);
}
return oit;
}
};
// difference/intersection of multipoint-linear
template
<
typename MultiPoint,
typename Linear,
typename PointOut,
overlay_type OverlayType,
typename Policy
>
class multipoint_linear_point
{
private:
// structs for partition -- start
struct expand_box
{
template <typename Box, typename Geometry>
static inline void apply(Box& total, Geometry const& geometry)
{
geometry::expand(total, geometry::return_envelope<Box>(geometry));
}
};
struct overlaps_box
{
template <typename Box, typename Geometry>
static inline bool apply(Box const& box, Geometry const& geometry)
{
return ! geometry::disjoint(geometry, box);
}
};
template <typename OutputIterator>
class item_visitor_type
{
public:
item_visitor_type(OutputIterator& oit) : m_oit(oit) {}
template <typename Item1, typename Item2>
inline void apply(Item1 const& item1, Item2 const& item2)
{
action_selector_pl_l
<
PointOut, overlay_intersection
>::apply(item1, Policy::apply(item1, item2), m_oit);
}
private:
OutputIterator& m_oit;
};
// structs for partition -- end
class segment_range
{
public:
typedef geometry::segment_iterator<Linear const> const_iterator;
typedef const_iterator iterator;
segment_range(Linear const& linear)
: m_linear(linear)
{}
const_iterator begin() const
{
return geometry::segments_begin(m_linear);
}
const_iterator end() const
{
return geometry::segments_end(m_linear);
}
private:
Linear const& m_linear;
};
template <typename OutputIterator>
static inline OutputIterator get_common_points(MultiPoint const& multipoint,
Linear const& linear,
OutputIterator oit)
{
item_visitor_type<OutputIterator> item_visitor(oit);
segment_range rng(linear);
geometry::partition
<
geometry::model::box
<
typename boost::range_value<MultiPoint>::type
>,
expand_box,
overlaps_box
>::apply(multipoint, rng, item_visitor);
return oit;
}
public:
template <typename RobustPolicy, typename OutputIterator, typename Strategy>
static inline OutputIterator apply(MultiPoint const& multipoint,
Linear const& linear,
RobustPolicy const& robust_policy,
OutputIterator oit,
Strategy const& strategy)
{
typedef std::vector
<
typename boost::range_value<MultiPoint>::type
> point_vector_type;
point_vector_type common_points;
// compute the common points
get_common_points(multipoint, linear,
std::back_inserter(common_points));
return multipoint_multipoint_point
<
MultiPoint, point_vector_type, PointOut, OverlayType
>::apply(multipoint, common_points, robust_policy, oit, strategy);
}
};
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace detail_dispatch { namespace overlay
{
// dispatch struct for pointlike-linear difference/intersection computation
template
<
typename PointLike,
typename Linear,
typename PointOut,
overlay_type OverlayType,
typename Tag1,
typename Tag2
>
struct pointlike_linear_point
: not_implemented<PointLike, Linear, PointOut>
{};
template
<
typename Point,
typename Linear,
typename PointOut,
overlay_type OverlayType
>
struct pointlike_linear_point
<
Point, Linear, PointOut, OverlayType, point_tag, linear_tag
> : detail::overlay::point_linear_point
<
Point, Linear, PointOut, OverlayType,
detail::not_<detail::disjoint::reverse_covered_by>
>
{};
template
<
typename Point,
typename Segment,
typename PointOut,
overlay_type OverlayType
>
struct pointlike_linear_point
<
Point, Segment, PointOut, OverlayType, point_tag, segment_tag
> : detail::overlay::point_linear_point
<
Point, Segment, PointOut, OverlayType,
detail::not_<detail::disjoint::reverse_covered_by>
>
{};
template
<
typename MultiPoint,
typename Linear,
typename PointOut,
overlay_type OverlayType
>
struct pointlike_linear_point
<
MultiPoint, Linear, PointOut, OverlayType, multi_point_tag, linear_tag
> : detail::overlay::multipoint_linear_point
<
MultiPoint, Linear, PointOut, OverlayType,
detail::not_<detail::disjoint::reverse_covered_by>
>
{};
template
<
typename MultiPoint,
typename Segment,
typename PointOut,
overlay_type OverlayType
>
struct pointlike_linear_point
<
MultiPoint, Segment, PointOut, OverlayType, multi_point_tag, segment_tag
> : detail::overlay::multipoint_segment_point
<
MultiPoint, Segment, PointOut, OverlayType,
detail::not_<detail::disjoint::reverse_covered_by>
>
{};
}} // namespace detail_dispatch::overlay
#endif // DOXYGEN_NO_DISPATCH
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_POINTLIKE_LINEAR_HPP
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