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// Copyright (c) 2012-2013, IGN France. // Copyright (c) 2012-2024, Oslandia. // Copyright (c) 2024-2025, SFCGAL team. // SPDX-License-Identifier: LGPL-2.0-or-later #ifndef SFCGAL_LINESTRING_H_ #define SFCGAL_LINESTRING_H_ #include #include #include #include #include #include "SFCGAL/Point.h" #include namespace SFCGAL { /** * A LineString in SFA */ class SFCGAL_API LineString : public Geometry { public: typedef boost::ptr_vector::iterator iterator; typedef boost::ptr_vector::const_iterator const_iterator; /** * Empty LineString constructor */ LineString(); /** * Constructor with a point vector */ LineString(const std::vector &points); /** * LineString constructor */ LineString(const Point &startPoint, const Point &endPoint); /** * Copy constructor */ LineString(LineString const &other); /** * assign operator */ LineString & operator=(LineString other); /** * destructor */ ~LineString(); //-- SFCGAL::Geometry LineString * clone() const override; //-- SFCGAL::Geometry std::string geometryType() const override; //-- SFCGAL::Geometry GeometryType geometryTypeId() const override; //-- SFCGAL::Geometry int dimension() const override; //-- SFCGAL::Geometry int coordinateDimension() const override; //-- SFCGAL::Geometry bool isEmpty() const override; //-- SFCGAL::Geometry bool is3D() const override; //-- SFCGAL::Geometry bool isMeasured() const override; auto dropZ() -> bool override; auto dropM() -> bool override; auto swapXY() -> void override; /** * remove all points from the LineString */ void clear(); /** * reverse LineString orientation */ void reverse(); /** * [SFA/OGC]Returns the number of points */ inline size_t numPoints() const { return _points.size(); } /** * Returns the number of segments * @warning not standard, returns zero if LineString contains only one point */ size_t numSegments() const; /** * [SFA/OGC]Returns the n-th point */ inline const Point & pointN(size_t const &n) const { BOOST_ASSERT(n < numPoints()); return _points[n]; } /** * [SFA/OGC]Returns the n-th point */ inline Point & pointN(size_t const &n) { BOOST_ASSERT(n < numPoints()); return _points[n]; } /** * [SFA/OGC]Returns the first point */ inline const Point & startPoint() const { return _points.front(); } /** * [SFA/OGC]Returns the first point */ inline Point & startPoint() { return _points.front(); } /** * [SFA/OGC]Returns the first point */ inline const Point & endPoint() const { return _points.back(); } /** * [SFA/OGC]Returns the first point */ inline Point & endPoint() { return _points.back(); } /** * append a Point to the LineString */ inline void addPoint(const Point &p) { _points.push_back(p.clone()); } /** * append a Point to the LineString and takes ownership */ inline void addPoint(Point *p) { _points.push_back(p); } //-- methods /** * test if the LineString is closed */ bool isClosed() const; /** * closes the LineString */ inline void closes() { _points.push_back(_points.front().clone()); } //-- iterators inline iterator begin() { return _points.begin(); } inline const_iterator begin() const { return _points.begin(); } inline iterator end() { return _points.end(); } inline const_iterator end() const { return _points.end(); } //-- optimization void reserve(const size_t &n); /** * Const iterator to 2D points * TODO: replace by boost::tranform_iterator ? */ class Point_2_const_iterator : public boost::iterator_facade { public: Point_2_const_iterator() {} explicit Point_2_const_iterator(const_iterator it) : it_(it) {} // Point_2_const_iterator( const Point_2_const_iterator& other ) : // it_(other.it_) {} private: friend class boost::iterator_core_access; void increment() { it_++; } void decrement() { it_--; } bool equal(const Point_2_const_iterator &other) const { return this->it_ == other.it_; } const Kernel::Point_2 & dereference() const { p_ = it_->toPoint_2(); return p_; } mutable Kernel::Point_2 p_; const_iterator it_; }; Point_2_const_iterator points_2_begin() const { return Point_2_const_iterator(begin()); } Point_2_const_iterator points_2_end() const { return Point_2_const_iterator(end()); } std::pair points_2() const { return std::make_pair(points_2_begin(), points_2_end()); } /** * Const iterator to 3D points * TODO: replace by boost::tranform_iterator ? */ class Point_3_const_iterator : public boost::iterator_facade { public: Point_3_const_iterator() {} explicit Point_3_const_iterator(const_iterator it) : it_(it) {} Point_3_const_iterator(const Point_3_const_iterator &other) : it_(other.it_) { } private: friend class boost::iterator_core_access; void increment() { it_++; } void decrement() { it_--; } bool equal(const Point_3_const_iterator &other) const { return this->it_ == other.it_; } const Kernel::Point_3 & dereference() const { p_ = it_->toPoint_3(); return p_; } mutable Kernel::Point_3 p_; const_iterator it_; }; Point_3_const_iterator points_3_begin() const { return Point_3_const_iterator(begin()); } Point_3_const_iterator points_3_end() const { return Point_3_const_iterator(end()); } std::pair points_3() const { return std::make_pair(points_3_begin(), points_3_end()); } /* * @brief Convert to CGAL::Polygon_2 * @param forceCounterClocksize force exterior ring orientation (counter * clocksize) */ CGAL::Polygon_2 toPolygon_2(bool fixOrientation = true) const; //-- visitors //-- SFCGAL::Geometry void accept(GeometryVisitor &visitor) override; //-- SFCGAL::Geometry void accept(ConstGeometryVisitor &visitor) const override; /** * Serializer */ template void serialize(Archive &ar, const unsigned int /*version*/) { ar &boost::serialization::base_object(*this); ar & _points; } private: boost::ptr_vector _points; void swap(LineString &other) { std::swap(_points, other._points); } }; } // namespace SFCGAL #endif