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/**********************************************************************
 * $Id: MonotoneChainOverlapAction.h 2556 2009-06-06 22:22:28Z strk $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * 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/MonotoneChainOverlapAction.java rev. 1.6 (JTS-1.10)
 *
 **********************************************************************/

#ifndef GEOS_IDX_CHAIN_MONOTONECHAINOVERLAPACTION_H
#define GEOS_IDX_CHAIN_MONOTONECHAINOVERLAPACTION_H

#include <geos/export.h>
#include <geos/geom/LineSegment.h>
#include <geos/geom/Envelope.h>


// Forward declarations
namespace geos {
	namespace index { 
		namespace chain { 
			class MonotoneChain;
		}
	}
}

namespace geos {
namespace index { // geos::index
namespace chain { // geos::index::chain

/**
 * The action for the internal iterator for performing
 * overlap queries on a MonotoneChain
 */
class GEOS_DLL MonotoneChainOverlapAction {

protected:

	geom::LineSegment overlapSeg1;

	geom::LineSegment overlapSeg2;

public:

	MonotoneChainOverlapAction() {};

	virtual ~MonotoneChainOverlapAction() {};

	/**
	 * This function can be overridden if the original chains are needed
	 *
	 * @param start1 the index of the start of the overlapping segment
	 *               from mc1
	 * @param start2 the index of the start of the overlapping segment
	 *               from mc2
	 */
	virtual void overlap(MonotoneChain& mc1, size_t start1,
	                     MonotoneChain& mc2, size_t start2);

	/**
	 * This is a convenience function which can be overridden to
	 * obtain the actual line segments which overlap
	 * @param seg1
	 * @param seg2
	 */
	virtual void overlap(const geom::LineSegment& /*seg1*/,
	                     const geom::LineSegment& /*seg2*/)
	{}

	// these envelopes are used during the MonotoneChain search process
	geom::Envelope tempEnv1;
	geom::Envelope tempEnv2;
};

} // namespace geos::index::chain
} // namespace geos::index
} // namespace geos

#endif // GEOS_IDX_CHAIN_MONOTONECHAINOVERLAPACTION_H

/**********************************************************************
 * $Log$
 * Revision 1.1  2006/03/22 18:12:31  strk
 * indexChain.h header split.
 *
 **********************************************************************/