SweepLineIndex.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006 Refractions Research 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.
 *
 **********************************************************************/
 
#ifndef GEOS_INDEX_SWEEPLINE_SWEEPLINEINDEX_H
#define GEOS_INDEX_SWEEPLINE_SWEEPLINEINDEX_H
 
#include <geos/export.h>
 
#include <vector>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
// Forward declarations
namespace geos {
        namespace index { 
                namespace sweepline {
                        class SweepLineInterval;
                        class SweepLineEvent;
                        class SweepLineOverlapAction;
                }
        }
}
 
namespace geos {
namespace index { // geos.index
namespace sweepline { // geos:index:sweepline

class GEOS_DLL SweepLineIndex {
 
public:
 
        SweepLineIndex();
 
        ~SweepLineIndex();
 
        void add(SweepLineInterval *sweepInt);
 
        void computeOverlaps(SweepLineOverlapAction *action);
 
private:
 
        // FIXME: make it a real vector rather then a pointer
        std::vector<SweepLineEvent*> events;
 
        bool indexBuilt;
 
        // statistics information
        int nOverlaps;

        void buildIndex();
 
        void processOverlaps(int start, int end,
                        SweepLineInterval *s0,
                        SweepLineOverlapAction *action);
};
 
} // namespace geos:index:sweepline
} // namespace geos:index
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // GEOS_INDEX_SWEEPLINE_SWEEPLINEINDEX_H