70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2021 Paul Ramsey <pramsey@cleverelephant.ca>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************/
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#pragma once
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#include <memory>
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#include <geos/geom/Coordinate.h>
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#include <geos/geom/CoordinateSequence.h>
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#include <geos/constants.h>
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using geos::geom::Coordinate;
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using geos::geom::CoordinateSequence;
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namespace geos {
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namespace simplify { // geos::simplify
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class LinkedRing
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{
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private:
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const CoordinateSequence& m_coord;
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std::size_t m_size;
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std::vector<std::size_t> m_next;
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std::vector<std::size_t> m_prev;
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static std::vector<std::size_t> createNextLinks(std::size_t size);
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static std::vector<std::size_t> createPrevLinks(std::size_t size);
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public:
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LinkedRing(const CoordinateSequence& cs)
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: m_coord(cs)
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, m_size(cs.size()-1)
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, m_next(createNextLinks(m_size))
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, m_prev(createPrevLinks(m_size))
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{};
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std::size_t size() const;
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std::size_t next(std::size_t i) const;
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std::size_t prev(std::size_t i) const;
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const Coordinate& getCoordinate(std::size_t index) const;
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const Coordinate& prevCoordinate(std::size_t index) const;
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const Coordinate& nextCoordinate(std::size_t index) const;
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bool hasCoordinate(std::size_t index) const;
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void remove(std::size_t index);
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std::unique_ptr<CoordinateSequence> getCoordinates() const;
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}; // LinkedRing
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} // geos::simplify
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} // geos
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