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Current File : //usr/include/boost/geometry/algorithms/detail/overlay/get_turn_info_helpers.hpp // Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2013, 2014, 2015, 2017, 2018, 2019.
// Modifications copyright (c) 2013-2019 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_ALGORITHMS_DETAIL_OVERLAY_GET_TURN_INFO_HELPERS_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_GET_TURN_INFO_HELPERS_HPP
#include <boost/geometry/algorithms/detail/direction_code.hpp>
#include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
#include <boost/geometry/algorithms/detail/recalculate.hpp>
#include <boost/geometry/core/assert.hpp>
#include <boost/geometry/geometries/segment.hpp> // referring_segment
#include <boost/geometry/policies/relate/direction.hpp>
#include <boost/geometry/policies/relate/intersection_points.hpp>
#include <boost/geometry/policies/relate/tupled.hpp>
#include <boost/geometry/policies/robustness/no_rescale_policy.hpp>
#include <boost/geometry/strategies/intersection_result.hpp>
namespace boost { namespace geometry {
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay {
enum turn_position { position_middle, position_front, position_back };
template <typename Point, typename SegmentRatio>
struct turn_operation_linear
: public turn_operation<Point, SegmentRatio>
{
turn_operation_linear()
: position(position_middle)
, is_collinear(false)
{}
turn_position position;
bool is_collinear; // valid only for Linear geometry
};
template
<
typename TurnPointCSTag,
typename UniqueSubRange1,
typename UniqueSubRange2,
typename SideStrategy
>
struct side_calculator
{
typedef typename UniqueSubRange1::point_type point1_type;
typedef typename UniqueSubRange2::point_type point2_type;
inline side_calculator(UniqueSubRange1 const& range_p,
UniqueSubRange2 const& range_q,
SideStrategy const& side_strategy)
: m_side_strategy(side_strategy)
, m_range_p(range_p)
, m_range_q(range_q)
{}
inline int pk_wrt_p1() const { return m_side_strategy.apply(get_pi(), get_pj(), get_pk()); }
inline int pk_wrt_q1() const { return m_side_strategy.apply(get_qi(), get_qj(), get_pk()); }
inline int qk_wrt_p1() const { return m_side_strategy.apply(get_pi(), get_pj(), get_qk()); }
inline int qk_wrt_q1() const { return m_side_strategy.apply(get_qi(), get_qj(), get_qk()); }
inline int pk_wrt_q2() const { return m_side_strategy.apply(get_qj(), get_qk(), get_pk()); }
inline int qk_wrt_p2() const { return m_side_strategy.apply(get_pj(), get_pk(), get_qk()); }
// Necessary when rescaling turns off:
inline int qj_wrt_p1() const { return m_side_strategy.apply(get_pi(), get_pj(), get_qj()); }
inline int qj_wrt_p2() const { return m_side_strategy.apply(get_pj(), get_pk(), get_qj()); }
inline int pj_wrt_q1() const { return m_side_strategy.apply(get_qi(), get_qj(), get_pj()); }
inline int pj_wrt_q2() const { return m_side_strategy.apply(get_qj(), get_qk(), get_pj()); }
inline point1_type const& get_pi() const { return m_range_p.at(0); }
inline point1_type const& get_pj() const { return m_range_p.at(1); }
inline point1_type const& get_pk() const { return m_range_p.at(2); }
inline point2_type const& get_qi() const { return m_range_q.at(0); }
inline point2_type const& get_qj() const { return m_range_q.at(1); }
inline point2_type const& get_qk() const { return m_range_q.at(2); }
// Used side-strategy, owned by the calculator,
// created from .get_side_strategy()
SideStrategy m_side_strategy;
// Used ranges - owned by get_turns or (for robust points) by intersection_info_base
UniqueSubRange1 const& m_range_p;
UniqueSubRange2 const& m_range_q;
};
template<typename Point, typename UniqueSubRange, typename RobustPolicy>
struct robust_subrange_adapter
{
typedef Point point_type;
robust_subrange_adapter(UniqueSubRange const& unique_sub_range,
Point const& robust_point_i, Point const& robust_point_j,
RobustPolicy const& robust_policy)
: m_unique_sub_range(unique_sub_range)
, m_robust_policy(robust_policy)
, m_robust_point_i(robust_point_i)
, m_robust_point_j(robust_point_j)
, m_k_retrieved(false)
{}
std::size_t size() const { return m_unique_sub_range.size(); }
//! Get precalculated point
Point const& at(std::size_t index) const
{
BOOST_GEOMETRY_ASSERT(index < size());
switch (index)
{
case 0 : return m_robust_point_i;
case 1 : return m_robust_point_j;
case 2 : return get_point_k();
default : return m_robust_point_i;
}
}
private :
Point const& get_point_k() const
{
if (! m_k_retrieved)
{
geometry::recalculate(m_robust_point_k, m_unique_sub_range.at(2), m_robust_policy);
m_k_retrieved = true;
}
return m_robust_point_k;
}
UniqueSubRange const& m_unique_sub_range;
RobustPolicy const& m_robust_policy;
Point const& m_robust_point_i;
Point const& m_robust_point_j;
mutable Point m_robust_point_k;
mutable bool m_k_retrieved;
};
template
<
typename UniqueSubRange1, typename UniqueSubRange2,
typename RobustPolicy
>
struct robust_points
{
typedef typename geometry::robust_point_type
<
typename UniqueSubRange1::point_type, RobustPolicy
>::type robust_point1_type;
typedef robust_point1_type robust_point2_type;
inline robust_points(UniqueSubRange1 const& range_p,
UniqueSubRange2 const& range_q,
RobustPolicy const& robust_policy)
: m_robust_policy(robust_policy)
, m_range_p(range_p)
, m_range_q(range_q)
, m_pk_retrieved(false)
, m_qk_retrieved(false)
{
// Calculate pi,pj and qi,qj which are almost always necessary
// But don't calculate pk/qk yet, which is retrieved (taking
// more time) and not always necessary.
geometry::recalculate(m_rpi, range_p.at(0), robust_policy);
geometry::recalculate(m_rpj, range_p.at(1), robust_policy);
geometry::recalculate(m_rqi, range_q.at(0), robust_policy);
geometry::recalculate(m_rqj, range_q.at(1), robust_policy);
}
inline robust_point1_type const& get_rpk() const
{
if (! m_pk_retrieved)
{
geometry::recalculate(m_rpk, m_range_p.at(2), m_robust_policy);
m_pk_retrieved = true;
}
return m_rpk;
}
inline robust_point2_type const& get_rqk() const
{
if (! m_qk_retrieved)
{
geometry::recalculate(m_rqk, m_range_q.at(2), m_robust_policy);
m_qk_retrieved = true;
}
return m_rqk;
}
robust_point1_type m_rpi, m_rpj;
robust_point2_type m_rqi, m_rqj;
private :
RobustPolicy const& m_robust_policy;
UniqueSubRange1 const& m_range_p;
UniqueSubRange2 const& m_range_q;
// On retrieval
mutable robust_point1_type m_rpk;
mutable robust_point2_type m_rqk;
mutable bool m_pk_retrieved;
mutable bool m_qk_retrieved;
};
template
<
typename UniqueSubRange1, typename UniqueSubRange2,
typename TurnPoint, typename UmbrellaStrategy, typename RobustPolicy>
class intersection_info_base
: private robust_points<UniqueSubRange1, UniqueSubRange2, RobustPolicy>
{
typedef robust_points<UniqueSubRange1, UniqueSubRange2, RobustPolicy> base;
public:
typedef typename base::robust_point1_type robust_point1_type;
typedef typename base::robust_point2_type robust_point2_type;
typedef robust_subrange_adapter<robust_point1_type, UniqueSubRange1, RobustPolicy> robust_subrange1;
typedef robust_subrange_adapter<robust_point2_type, UniqueSubRange2, RobustPolicy> robust_subrange2;
typedef typename cs_tag<TurnPoint>::type cs_tag;
typedef typename UmbrellaStrategy::side_strategy_type side_strategy_type;
typedef side_calculator<cs_tag, robust_subrange1, robust_subrange2,
side_strategy_type> side_calculator_type;
typedef side_calculator
<
cs_tag, robust_subrange2, robust_subrange1,
side_strategy_type
> robust_swapped_side_calculator_type;
intersection_info_base(UniqueSubRange1 const& range_p,
UniqueSubRange2 const& range_q,
UmbrellaStrategy const& umbrella_strategy,
RobustPolicy const& robust_policy)
: base(range_p, range_q, robust_policy)
, m_range_p(range_p)
, m_range_q(range_q)
, m_robust_range_p(range_p, base::m_rpi, base::m_rpj, robust_policy)
, m_robust_range_q(range_q, base::m_rqi, base::m_rqj, robust_policy)
, m_side_calc(m_robust_range_p, m_robust_range_q,
umbrella_strategy.get_side_strategy())
{}
inline typename UniqueSubRange1::point_type const& pi() const { return m_range_p.at(0); }
inline typename UniqueSubRange2::point_type const& qi() const { return m_range_q.at(0); }
inline robust_point1_type const& rpi() const { return base::m_rpi; }
inline robust_point1_type const& rpj() const { return base::m_rpj; }
inline robust_point1_type const& rpk() const { return base::get_rpk(); }
inline robust_point2_type const& rqi() const { return base::m_rqi; }
inline robust_point2_type const& rqj() const { return base::m_rqj; }
inline robust_point2_type const& rqk() const { return base::get_rqk(); }
inline side_calculator_type const& sides() const { return m_side_calc; }
robust_swapped_side_calculator_type get_swapped_sides() const
{
robust_swapped_side_calculator_type result(
m_robust_range_q, m_robust_range_p,
m_side_calc.m_side_strategy);
return result;
}
// Owned by get_turns
UniqueSubRange1 const& m_range_p;
UniqueSubRange2 const& m_range_q;
private :
// Owned by this class
robust_subrange1 m_robust_range_p;
robust_subrange2 m_robust_range_q;
side_calculator_type m_side_calc;
};
template
<
typename UniqueSubRange1, typename UniqueSubRange2,
typename TurnPoint, typename UmbrellaStrategy
>
class intersection_info_base<UniqueSubRange1, UniqueSubRange2,
TurnPoint, UmbrellaStrategy, detail::no_rescale_policy>
{
public:
typedef typename UniqueSubRange1::point_type point1_type;
typedef typename UniqueSubRange2::point_type point2_type;
typedef typename UniqueSubRange1::point_type robust_point1_type;
typedef typename UniqueSubRange2::point_type robust_point2_type;
typedef typename UmbrellaStrategy::cs_tag cs_tag;
typedef typename UmbrellaStrategy::side_strategy_type side_strategy_type;
typedef side_calculator<cs_tag, UniqueSubRange1, UniqueSubRange2, side_strategy_type> side_calculator_type;
typedef side_calculator
<
cs_tag, UniqueSubRange2, UniqueSubRange1,
side_strategy_type
> swapped_side_calculator_type;
intersection_info_base(UniqueSubRange1 const& range_p,
UniqueSubRange2 const& range_q,
UmbrellaStrategy const& umbrella_strategy,
no_rescale_policy const& /*robust_policy*/)
: m_range_p(range_p)
, m_range_q(range_q)
, m_side_calc(range_p, range_q,
umbrella_strategy.get_side_strategy())
{}
inline point1_type const& rpi() const { return m_side_calc.get_pi(); }
inline point1_type const& rpj() const { return m_side_calc.get_pj(); }
inline point1_type const& rpk() const { return m_side_calc.get_pk(); }
inline point2_type const& rqi() const { return m_side_calc.get_qi(); }
inline point2_type const& rqj() const { return m_side_calc.get_qj(); }
inline point2_type const& rqk() const { return m_side_calc.get_qk(); }
inline side_calculator_type const& sides() const { return m_side_calc; }
swapped_side_calculator_type get_swapped_sides() const
{
swapped_side_calculator_type result(
m_range_q, m_range_p,
m_side_calc.m_side_strategy);
return result;
}
protected :
// Owned by get_turns
UniqueSubRange1 const& m_range_p;
UniqueSubRange2 const& m_range_q;
private :
// Owned here, passed by .get_side_strategy()
side_calculator_type m_side_calc;
};
template
<
typename UniqueSubRange1, typename UniqueSubRange2,
typename TurnPoint,
typename UmbrellaStrategy,
typename RobustPolicy
>
class intersection_info
: public intersection_info_base<UniqueSubRange1, UniqueSubRange2,
TurnPoint, UmbrellaStrategy, RobustPolicy>
{
typedef intersection_info_base<UniqueSubRange1, UniqueSubRange2,
TurnPoint, UmbrellaStrategy, RobustPolicy> base;
public:
typedef segment_intersection_points
<
TurnPoint,
typename geometry::segment_ratio_type
<
TurnPoint, RobustPolicy
>::type
> intersection_point_type;
typedef typename UniqueSubRange1::point_type point1_type;
typedef typename UniqueSubRange2::point_type point2_type;
// NOTE: formerly defined in intersection_strategies
typedef policies::relate::segments_tupled
<
policies::relate::segments_intersection_points
<
intersection_point_type
>,
policies::relate::segments_direction
> intersection_policy_type;
typedef UmbrellaStrategy intersection_strategy_type;
typedef typename UmbrellaStrategy::side_strategy_type side_strategy_type;
typedef typename UmbrellaStrategy::cs_tag cs_tag;
typedef model::referring_segment<point1_type const> segment_type1;
typedef model::referring_segment<point2_type const> segment_type2;
typedef typename base::side_calculator_type side_calculator_type;
typedef typename intersection_policy_type::return_type result_type;
typedef typename boost::tuples::element<0, result_type>::type i_info_type; // intersection_info
typedef typename boost::tuples::element<1, result_type>::type d_info_type; // dir_info
intersection_info(UniqueSubRange1 const& range_p,
UniqueSubRange2 const& range_q,
UmbrellaStrategy const& umbrella_strategy,
RobustPolicy const& robust_policy)
: base(range_p, range_q,
umbrella_strategy, robust_policy)
, m_result(umbrella_strategy.apply(
segment_type1(range_p.at(0), range_p.at(1)),
segment_type2(range_q.at(0), range_q.at(1)),
intersection_policy_type(),
robust_policy,
base::rpi(), base::rpj(),
base::rqi(), base::rqj()))
, m_intersection_strategy(umbrella_strategy)
, m_robust_policy(robust_policy)
{}
inline result_type const& result() const { return m_result; }
inline i_info_type const& i_info() const { return m_result.template get<0>(); }
inline d_info_type const& d_info() const { return m_result.template get<1>(); }
inline side_strategy_type get_side_strategy() const
{
return m_intersection_strategy.get_side_strategy();
}
// TODO: it's more like is_spike_ip_p
inline bool is_spike_p() const
{
if (base::m_range_p.is_last_segment())
{
return false;
}
if (base::sides().pk_wrt_p1() == 0)
{
// p: pi--------pj--------pk
// or: pi----pk==pj
if (! is_ip_j<0>())
{
return false;
}
// TODO: why is q used to determine spike property in p?
bool const has_qk = ! base::m_range_q.is_last_segment();
int const qk_p1 = has_qk ? base::sides().qk_wrt_p1() : 0;
int const qk_p2 = has_qk ? base::sides().qk_wrt_p2() : 0;
if (qk_p1 == -qk_p2)
{
if (qk_p1 == 0)
{
// qk is collinear with both p1 and p2,
// verify if pk goes backwards w.r.t. pi/pj
return direction_code<cs_tag>(base::rpi(), base::rpj(), base::rpk()) == -1;
}
// qk is at opposite side of p1/p2, therefore
// p1/p2 (collinear) are opposite and form a spike
return true;
}
}
return false;
}
inline bool is_spike_q() const
{
if (base::m_range_q.is_last_segment())
{
return false;
}
// See comments at is_spike_p
if (base::sides().qk_wrt_q1() == 0)
{
if (! is_ip_j<1>())
{
return false;
}
// TODO: why is p used to determine spike property in q?
bool const has_pk = ! base::m_range_p.is_last_segment();
int const pk_q1 = has_pk ? base::sides().pk_wrt_q1() : 0;
int const pk_q2 = has_pk ? base::sides().pk_wrt_q2() : 0;
if (pk_q1 == -pk_q2)
{
if (pk_q1 == 0)
{
return direction_code<cs_tag>(base::rqi(), base::rqj(), base::rqk()) == -1;
}
return true;
}
}
return false;
}
private:
template <std::size_t OpId>
bool is_ip_j() const
{
int arrival = d_info().arrival[OpId];
bool same_dirs = d_info().dir_a == 0 && d_info().dir_b == 0;
if (same_dirs)
{
if (i_info().count == 2)
{
return arrival != -1;
}
else
{
return arrival == 0;
}
}
else
{
return arrival == 1;
}
}
result_type m_result;
UmbrellaStrategy const& m_intersection_strategy;
RobustPolicy const& m_robust_policy;
};
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_GET_TURN_INFO_HELPERS_HPP
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