index/chain/MonotoneChain.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * 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.
 *
 **********************************************************************
 *
 * Last port: index/chain/MonotoneChain.java rev. 1.15 (JTS-1.10)
 *
 **********************************************************************/

#ifndef GEOS_IDX_CHAIN_MONOTONECHAIN_H
#define GEOS_IDX_CHAIN_MONOTONECHAIN_H

#include <geos/export.h>
#include <geos/geom/Envelope.h> // for inline

#include <memory> // for unique_ptr

// Forward declarations
namespace geos {
namespace geom {
class LineSegment;
class CoordinateSequence;
}
namespace index {
namespace chain {
class MonotoneChainSelectAction;
class MonotoneChainOverlapAction;
}
}
}

namespace geos {
namespace index { // geos::index
namespace chain { // geos::index::chain

class GEOS_DLL MonotoneChain {
public:

    MonotoneChain(const geom::CoordinateSequence& pts,
                  std::size_t start, std::size_t end, void* context);

    ~MonotoneChain() = default;

    const geom::Envelope& getEnvelope();
    const geom::Envelope& getEnvelope(double expansionDistance);

    size_t
    getStartIndex() const
    {
        return start;
    }

    size_t
    getEndIndex() const
    {
        return end;
    }

    void getLineSegment(std::size_t index, geom::LineSegment& ls) const;

    std::unique_ptr<geom::CoordinateSequence> getCoordinates() const;

    void select(const geom::Envelope& searchEnv,
                MonotoneChainSelectAction& mcs);

    void computeOverlaps(MonotoneChain* mc,
                         MonotoneChainOverlapAction* mco);

    void computeOverlaps(MonotoneChain* mc, double overlapTolerance,
                         MonotoneChainOverlapAction* mco);

    void
    setId(int nId)
    {
        id = nId;
    }

    inline int
    getId() const
    {
        return id;
    }

    void*
    getContext()
    {
        return context;
    }

private:

    void computeSelect(const geom::Envelope& searchEnv,
                       size_t start0,
                       size_t end0,
                       MonotoneChainSelectAction& mcs);

    void computeOverlaps(std::size_t start0, std::size_t end0, MonotoneChain& mc,
                         std::size_t start1, std::size_t end1,
                         double overlapTolerance,
                         MonotoneChainOverlapAction& mco);

    bool overlaps(size_t start0, size_t end0,
                  const MonotoneChain& mc, size_t start1, size_t end1,
                  double overlapTolerance) const;

    bool overlaps(const geom::Coordinate& p1, const geom::Coordinate& p2,
                  const geom::Coordinate& q1, const geom::Coordinate& q2,
                  double overlapTolerance) const;

    const geom::CoordinateSequence& pts;

    void* context;

    size_t start;

    size_t end;

    geom::Envelope env;
    bool envIsSet;

    int id;


    // Declare type as noncopyable
    MonotoneChain(const MonotoneChain& other) = delete;
    MonotoneChain& operator=(const MonotoneChain& rhs) = delete;
};

} // namespace geos::index::chain
} // namespace geos::index
} // namespace geos

#endif // GEOS_IDX_CHAIN_MONOTONECHAIN_H