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.
 *
 **********************************************************************/
 
#pragma once
 
#include <vector>
#include <geos/export.h>
 
 
#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(std::size_t start, std::size_t end,
                         SweepLineInterval* s0,
                         SweepLineOverlapAction* action);
};
 
} // namespace geos:index:sweepline
} // namespace geos:index
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif