/**********************************************************************
 *
 * 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 Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: noding/IntersectionFinderAdder.java rev. 1.5 (JTS-1.9)
 *
 **********************************************************************/

#include <vector>

#include <geos/noding/IntersectionFinderAdder.h>
#include <geos/noding/SegmentString.h>
#include <geos/noding/NodedSegmentString.h>
#include <geos/algorithm/LineIntersector.h>
#include <geos/geom/Coordinate.h>

using namespace geos::geom;

namespace geos {
namespace noding { // geos.noding

void
IntersectionFinderAdder::processIntersections(
		SegmentString* e0,  int segIndex0,
		SegmentString* e1,  int segIndex1)
{
	// don't bother intersecting a segment with itself
	if (e0 == e1 && segIndex0 == segIndex1) return;

	const Coordinate& p00 = e0->getCoordinate(segIndex0);
	const Coordinate& p01 = e0->getCoordinate(segIndex0 + 1);
	const Coordinate& p10 = e1->getCoordinate(segIndex1);
	const Coordinate& p11 = e1->getCoordinate(segIndex1 + 1);

	li.computeIntersection(p00, p01, p10, p11);
//if (li.hasIntersection() && li.isProper()) Debug.println(li);

	if (li.hasIntersection())
	{
		if (li.isInteriorIntersection())
		{
			for (int intIndex=0, n=li.getIntersectionNum(); intIndex<n; intIndex++)
			{
				interiorIntersections.push_back(li.getIntersection(intIndex));
			}

			NodedSegmentString* ee0 = dynamic_cast<NodedSegmentString*>(e0);
			NodedSegmentString* ee1 = dynamic_cast<NodedSegmentString*>(e1);
			assert(ee0 && ee1);
        		ee0->addIntersections(&li, segIndex0, 0);
			ee1->addIntersections(&li, segIndex1, 1);
		}
	}
}

} // namespace geos.noding
} // namespace geos