CoverageRing.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2022 Paul Ramsey <pramsey@cleverelephant.ca>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/noding/BasicSegmentString.h>
 
#include <deque>
 
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
class CoordinateSequence;
class Geometry;
class GeometryFactory;
class LineString;
class LinearRing;
class Polygon;
}
}
 
namespace geos {      // geos.
namespace coverage { // geos.coverage
 
class GEOS_DLL CoverageRing : public noding::BasicSegmentString {
    using Coordinate = geos::geom::Coordinate;
    using CoordinateSequence = geos::geom::CoordinateSequence;
    using Geometry = geos::geom::Geometry;
    using GeometryFactory = geos::geom::GeometryFactory;
    using Polygon = geos::geom::Polygon;
    using LineString = geos::geom::LineString;
    using LinearRing = geos::geom::LinearRing;
 
private:
 
    // Members
    bool m_isInteriorOnRight;
    std::vector<bool> m_isInvalid;
    std::vector<bool> m_isMatched;
 
    std::size_t findInvalidStart(std::size_t index);
 
    std::size_t findInvalidEnd(std::size_t index);
 
    std::size_t nextMarkIndex(std::size_t index);
 
    std::unique_ptr<LineString> createLine(
        std::size_t startIndex,
        std::size_t endIndex,
        const GeometryFactory* geomFactory);
 
    std::unique_ptr<CoordinateSequence> extractSection(
        std::size_t startIndex, std::size_t endIndex);
 
    std::unique_ptr<CoordinateSequence> extractSectionWrap(
        std::size_t startIndex, std::size_t endIndex);
 
public:
 
    CoverageRing(CoordinateSequence* pts, bool interiorOnRight);
 
    CoverageRing(const LinearRing* ring, bool isShell);
 
    geom::Envelope getEnvelope(std::size_t start, std::size_t end);
 
    static bool isKnown(std::vector<CoverageRing*>& rings);
 
    bool isInteriorOnRight() const;
 
    void markInvalid(std::size_t index);
 
    void markMatched(std::size_t index);
 
    bool isKnown() const;
 
    bool isInvalid(std::size_t i) const;
 
    bool isInvalid() const;
 
    bool hasInvalid() const;
 
    bool isKnown(std::size_t i) const;
 
    const Coordinate& findVertexPrev(std::size_t index, const Coordinate& pt) const;
 
    const Coordinate& findVertexNext(std::size_t index, const Coordinate& pt) const;
 
    std::size_t prev(std::size_t index) const;
 
    std::size_t next(std::size_t index) const;
 
    void createInvalidLines(
        const GeometryFactory* geomFactory,
        std::vector<std::unique_ptr<LineString>>& lines);
 
};
 
} // namespace geos.coverage
} // namespace geos