SimpleSweepLineIntersector.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * 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.
 *
 **********************************************************************/
 
#ifndef GEOS_GEOMGRAPH_INDEX_SIMPLESWEEPLINEINTERSECTOR_H
#define GEOS_GEOMGRAPH_INDEX_SIMPLESWEEPLINEINTERSECTOR_H
 
#include <geos/export.h>
#include <vector>
 
#include <geos/geomgraph/index/EdgeSetIntersector.h> // for inheritance
 
#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 geomgraph {
                class Edge;
                namespace index {
                        class SegmentIntersector;
                        class SweepLineEvent;
                }
        }
}
 
namespace geos {
namespace geomgraph { // geos::geomgraph
namespace index { // geos::geomgraph::index

class GEOS_DLL SimpleSweepLineIntersector: public EdgeSetIntersector {
 
public:
 
        SimpleSweepLineIntersector();
 
        virtual ~SimpleSweepLineIntersector();
 
        void computeIntersections(std::vector<Edge*> *edges,
                        SegmentIntersector *si,
                        bool testAllSegments);
 
        void computeIntersections(std::vector<Edge*> *edges0,
                        std::vector<Edge*> *edges1,
                        SegmentIntersector *si);
 
private:
 
        void add(std::vector<Edge*> *edges);
 
        std::vector<SweepLineEvent*> events;
 
        // statistics information
        int nOverlaps;
 
        void add(std::vector<Edge*> *edges, void* edgeSet);
 
        void add(Edge *edge,void* edgeSet);
 
        void prepareEvents();
 
        void computeIntersections(SegmentIntersector *si);
 
        void processOverlaps(int start, int end, SweepLineEvent *ev0,
                        SegmentIntersector *si);
};
 
} // namespace geos.geomgraph.index
} // namespace geos.geomgraph
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // GEOS_GEOMGRAPH_INDEX_SIMPLESWEEPLINEINTERSECTOR_H