index/chain/MonotoneChain.h

/**********************************************************************
 *
 * 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 auto_ptr
 
// Forward declarations
namespace geos {
        namespace geom {
                class Envelope;
                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();

        const geom::Envelope& getEnvelope() const;
 
        size_t getStartIndex() const { return start; }
 
        size_t getEndIndex() const { return end; }

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

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

        void select(const geom::Envelope& searchEnv,
                        MonotoneChainSelectAction& mcs);
 
        void computeOverlaps(MonotoneChain *mc,
                        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,
                             MonotoneChainOverlapAction& mco);

        const geom::CoordinateSequence& pts;

        mutable geom::Envelope* env;

        void* context;

        size_t start;

        size_t end;

        int id;
 
    // Declare type as noncopyable
    MonotoneChain(const MonotoneChain& other);
    MonotoneChain& operator=(const MonotoneChain& rhs);
};
 
} // namespace geos::index::chain
} // namespace geos::index
} // namespace geos
 
#endif // GEOS_IDX_CHAIN_MONOTONECHAIN_H