OverlayEdgeRing.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2020 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/algorithm/locate/IndexedPointInAreaLocator.h>
#include <geos/geom/CoordinateArraySequence.h>
#include <geos/geom/LinearRing.h>
#include <geos/export.h>

// Forward declarations
namespace geos {
namespace algorithm {
namespace locate {
class PointOnGeometryLocator;
}
}
namespace geom {
class Coordinate;
class CoordinateSequence;
class GeometryFactory;
class LinearRing;
class Polygon;
}
namespace operation {
namespace overlayng {
class OverlayEdge;
}
}
}

namespace geos {      // geos.
namespace operation { // geos.operation
namespace overlayng { // geos.operation.overlayng

using namespace geos::geom;
using algorithm::locate::PointOnGeometryLocator;
using algorithm::locate::IndexedPointInAreaLocator;

class GEOS_DLL OverlayEdgeRing {

private:

    // Members
    OverlayEdge* startEdge;
    std::unique_ptr<LinearRing> ring;
    bool m_isHole;
    CoordinateArraySequence ringPts;
    std::unique_ptr<IndexedPointInAreaLocator> locator;
    OverlayEdgeRing* shell;
    // a list of EdgeRings which are holes in this EdgeRing
    std::vector<OverlayEdgeRing*> holes;

    // Methods
    void computeRingPts(OverlayEdge* start, CoordinateArraySequence& pts);
    void computeRing(const CoordinateArraySequence& ringPts, const GeometryFactory* geometryFactory);

    const CoordinateArraySequence& getCoordinates();
    PointOnGeometryLocator* getLocator();
    void closeRing(CoordinateArraySequence& pts);


public:

    OverlayEdgeRing(OverlayEdge* start, const GeometryFactory* geometryFactory);

    std::unique_ptr<LinearRing> getRing();
    const LinearRing* getRingPtr() const;

    bool isHole() const;

    void setShell(OverlayEdgeRing* p_shell);

    bool hasShell() const;

    const OverlayEdgeRing* getShell() const;

    void addHole(OverlayEdgeRing* ring);

    bool isInRing(const Coordinate& pt);

    const Coordinate& getCoordinate();

    std::unique_ptr<Polygon> toPolygon(const GeometryFactory* factory);

    OverlayEdge* getEdge();

    OverlayEdgeRing* findEdgeRingContaining(std::vector<OverlayEdgeRing*>& erList);


};


} // namespace geos.operation.overlayng
} // namespace geos.operation
} // namespace geos