LineLimiter.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/geom/CoordinateArraySequence.h>

#include <geos/export.h>
#include <array>
#include <memory>
#include <vector>

// Forward declarations
namespace geos {
namespace geom {
class Envelope;
class Coordinate;
class CoordinateSequence;
}
}

using namespace geos::geom;

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

class GEOS_DLL LineLimiter {

private:

    // Members
    const Envelope* limitEnv;
    std::unique_ptr<std::vector<Coordinate>> ptList;
    const Coordinate* lastOutside;
    std::vector<std::unique_ptr<CoordinateArraySequence>> sections;

    // Methods
    void addPoint(const Coordinate* p);
    void addOutside(const Coordinate* p);
    bool isLastSegmentIntersecting(const Coordinate* p);
    bool isSectionOpen();
    void startSection();
    void finishSection();


public:

    LineLimiter(const Envelope* env)
        : limitEnv(env)
        , ptList(nullptr)
        , lastOutside(nullptr)
        {};

    std::vector<std::unique_ptr<CoordinateArraySequence>>& limit(const CoordinateSequence *pts);

};


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