297 lines
9.0 KiB
C++
297 lines
9.0 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2013 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2013, 2014, 2016, 2017.
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// Modifications copyright (c) 2013-2017 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_STRATEGY_CARTESIAN_POINT_IN_POLY_WINDING_HPP
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#define BOOST_GEOMETRY_STRATEGY_CARTESIAN_POINT_IN_POLY_WINDING_HPP
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/util/math.hpp>
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#include <boost/geometry/util/select_calculation_type.hpp>
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#include <boost/geometry/strategies/cartesian/side_by_triangle.hpp>
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#include <boost/geometry/strategies/covered_by.hpp>
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#include <boost/geometry/strategies/within.hpp>
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namespace boost { namespace geometry
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{
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namespace strategy { namespace within
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{
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/*!
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\brief Within detection using winding rule in cartesian coordinate system.
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\ingroup strategies
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\tparam Point \tparam_point
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\tparam PointOfSegment \tparam_segment_point
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\tparam CalculationType \tparam_calculation
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\author Barend Gehrels
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\note The implementation is inspired by terralib http://www.terralib.org (LGPL)
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\note but totally revised afterwards, especially for cases on segments
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\qbk{
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[heading See also]
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[link geometry.reference.algorithms.within.within_3_with_strategy within (with strategy)]
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}
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*/
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template
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<
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typename Point,
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typename PointOfSegment = Point,
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typename CalculationType = void
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>
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class cartesian_winding
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{
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typedef side::side_by_triangle<CalculationType> side_strategy_type;
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typedef typename select_calculation_type
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<
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Point,
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PointOfSegment,
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CalculationType
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>::type calculation_type;
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/*! subclass to keep state */
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class counter
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{
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int m_count;
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bool m_touches;
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inline int code() const
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{
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return m_touches ? 0 : m_count == 0 ? -1 : 1;
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}
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public :
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friend class cartesian_winding;
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inline counter()
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: m_count(0)
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, m_touches(false)
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{}
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};
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public:
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typedef typename side_strategy_type::envelope_strategy_type envelope_strategy_type;
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static inline envelope_strategy_type get_envelope_strategy()
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{
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return side_strategy_type::get_envelope_strategy();
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}
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typedef typename side_strategy_type::disjoint_strategy_type disjoint_strategy_type;
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static inline disjoint_strategy_type get_disjoint_strategy()
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{
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return side_strategy_type::get_disjoint_strategy();
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}
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// Typedefs and static methods to fulfill the concept
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typedef Point point_type;
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typedef PointOfSegment segment_point_type;
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typedef counter state_type;
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static inline bool apply(Point const& point,
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PointOfSegment const& s1, PointOfSegment const& s2,
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counter& state)
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{
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bool eq1 = false;
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bool eq2 = false;
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int count = check_segment(point, s1, s2, state, eq1, eq2);
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if (count != 0)
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{
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int side = 0;
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if (count == 1 || count == -1)
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{
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side = side_equal(point, eq1 ? s1 : s2, count);
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}
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else // count == 2 || count == -2
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{
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// 1 left, -1 right
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side = side_strategy_type::apply(s1, s2, point);
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}
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if (side == 0)
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{
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// Point is lying on segment
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state.m_touches = true;
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state.m_count = 0;
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return false;
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}
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// Side is NEG for right, POS for left.
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// The count is -2 for left, 2 for right (or -1/1)
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// Side positive thus means RIGHT and LEFTSIDE or LEFT and RIGHTSIDE
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// See accompagnying figure (TODO)
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if (side * count > 0)
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{
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state.m_count += count;
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}
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}
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return ! state.m_touches;
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}
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static inline int result(counter const& state)
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{
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return state.code();
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}
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private:
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static inline int check_segment(Point const& point,
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PointOfSegment const& seg1,
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PointOfSegment const& seg2,
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counter& state,
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bool& eq1, bool& eq2)
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{
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if (check_touch(point, seg1, seg2, state, eq1, eq2))
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{
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return 0;
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}
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return calculate_count(point, seg1, seg2, eq1, eq2);
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}
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static inline bool check_touch(Point const& point,
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PointOfSegment const& seg1,
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PointOfSegment const& seg2,
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counter& state,
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bool& eq1, bool& eq2)
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{
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calculation_type const px = get<0>(point);
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calculation_type const s1x = get<0>(seg1);
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calculation_type const s2x = get<0>(seg2);
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eq1 = math::equals(s1x, px);
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eq2 = math::equals(s2x, px);
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// Both equal p -> segment vertical
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// The only thing which has to be done is check if point is ON segment
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if (eq1 && eq2)
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{
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calculation_type const py = get<1>(point);
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calculation_type const s1y = get<1>(seg1);
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calculation_type const s2y = get<1>(seg2);
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if ((s1y <= py && s2y >= py) || (s2y <= py && s1y >= py))
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{
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state.m_touches = true;
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}
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return true;
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}
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return false;
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}
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static inline int calculate_count(Point const& point,
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PointOfSegment const& seg1,
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PointOfSegment const& seg2,
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bool eq1, bool eq2)
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{
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calculation_type const p = get<0>(point);
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calculation_type const s1 = get<0>(seg1);
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calculation_type const s2 = get<0>(seg2);
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return eq1 ? (s2 > p ? 1 : -1) // Point on level s1, E/W depending on s2
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: eq2 ? (s1 > p ? -1 : 1) // idem
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: s1 < p && s2 > p ? 2 // Point between s1 -> s2 --> E
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: s2 < p && s1 > p ? -2 // Point between s2 -> s1 --> W
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: 0;
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}
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static inline int side_equal(Point const& point,
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PointOfSegment const& se,
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int count)
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{
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// NOTE: for D=0 the signs would be reversed
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return math::equals(get<1>(point), get<1>(se)) ?
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0 :
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get<1>(point) < get<1>(se) ?
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// assuming count is equal to 1 or -1
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-count : // ( count > 0 ? -1 : 1) :
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count; // ( count > 0 ? 1 : -1) ;
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}
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};
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#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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namespace services
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{
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template <typename PointLike, typename Geometry, typename AnyTag1, typename AnyTag2>
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struct default_strategy<PointLike, Geometry, AnyTag1, AnyTag2, pointlike_tag, polygonal_tag, cartesian_tag, cartesian_tag>
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{
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typedef cartesian_winding
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<
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typename geometry::point_type<PointLike>::type,
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typename geometry::point_type<Geometry>::type
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> type;
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};
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template <typename PointLike, typename Geometry, typename AnyTag1, typename AnyTag2>
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struct default_strategy<PointLike, Geometry, AnyTag1, AnyTag2, pointlike_tag, linear_tag, cartesian_tag, cartesian_tag>
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{
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typedef cartesian_winding
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<
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typename geometry::point_type<PointLike>::type,
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typename geometry::point_type<Geometry>::type
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> type;
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};
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} // namespace services
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#endif
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}} // namespace strategy::within
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#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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namespace strategy { namespace covered_by { namespace services
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{
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template <typename PointLike, typename Geometry, typename AnyTag1, typename AnyTag2>
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struct default_strategy<PointLike, Geometry, AnyTag1, AnyTag2, pointlike_tag, polygonal_tag, cartesian_tag, cartesian_tag>
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{
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typedef within::cartesian_winding
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<
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typename geometry::point_type<PointLike>::type,
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typename geometry::point_type<Geometry>::type
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> type;
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};
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template <typename PointLike, typename Geometry, typename AnyTag1, typename AnyTag2>
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struct default_strategy<PointLike, Geometry, AnyTag1, AnyTag2, pointlike_tag, linear_tag, cartesian_tag, cartesian_tag>
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{
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typedef within::cartesian_winding
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<
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typename geometry::point_type<PointLike>::type,
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typename geometry::point_type<Geometry>::type
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> type;
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};
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}}} // namespace strategy::covered_by::services
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#endif
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGY_CARTESIAN_POINT_IN_POLY_WINDING_HPP
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