geomgraph/index/SweepLineEvent.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_SWEEPLINEEVENT_H
#define GEOS_GEOMGRAPH_INDEX_SWEEPLINEEVENT_H
 
 
#include <geos/export.h>
#include <string>
 
// Forward declarations
namespace geos {
        namespace geomgraph {
                namespace index {
                        class SweepLineEventOBJ;
                }
        }
}
 
namespace geos {
namespace geomgraph { // geos::geomgraph
namespace index { // geos::geomgraph::index
 
//class SweepLineEventLessThen; // needed ??
 
class GEOS_DLL SweepLineEvent{
friend class SweepLineEventLessThen;
 
public:
 
        enum {
                INSERT_EVENT = 1,
                DELETE_EVENT
        };
 
        SweepLineEvent(void* newEdgeSet, double x,
                        SweepLineEvent *newInsertEvent,
                        SweepLineEventOBJ *newObj);
 
        virtual ~SweepLineEvent();
 
        bool isInsert() { return insertEvent==NULL; }
 
        bool isDelete() { return insertEvent!=NULL; }
 
        SweepLineEvent* getInsertEvent() { return insertEvent; }
 
        int getDeleteEventIndex() { return deleteEventIndex; }
 
        void setDeleteEventIndex(int newDeleteEventIndex) {
                deleteEventIndex=newDeleteEventIndex;
        }
 
        SweepLineEventOBJ* getObject() const { return obj; }
 
        int compareTo(SweepLineEvent *sle);
 
        std::string print();
 
        void* edgeSet;    // used for red-blue intersection detection
 
protected:
 
        SweepLineEventOBJ* obj;
 
private:
 
        double xValue;
 
        int eventType;
 
        SweepLineEvent *insertEvent; // null if this is an INSERT_EVENT event
 
        int deleteEventIndex;
};
 
class GEOS_DLL SweepLineEventLessThen {
public:
        bool operator()(const SweepLineEvent *f, const SweepLineEvent *s) const
        {
                if (f->xValue<s->xValue) return true;
                if (f->xValue>s->xValue) return false;
                if (f->eventType<s->eventType) return true;
                return false;
        }
};
 
 
 
} // namespace geos.geomgraph.index
} // namespace geos.geomgraph
} // namespace geos
 
#endif