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/**********************************************************************
* $Id: SegmentIntersectionTester.cpp 1820 2006-09-06 16:54:23Z mloskot $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* 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.
*
**********************************************************************
*
* Last port: operation/predicate/SegmentIntersectionTester.java rev. 1.6
* (JTS-1.7)
*
**********************************************************************/
#include <geos/operation/predicate/SegmentIntersectionTester.h>
#include <geos/geom/LineString.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/algorithm/LineIntersector.h>
using namespace geos::geom;
namespace geos {
namespace operation {
namespace predicate {
bool
SegmentIntersectionTester::hasIntersectionWithLineStrings(
const CoordinateSequence &seq,
const LineString::ConstVect& lines)
{
for (size_t i=0, n=lines.size(); i<n; ++i )
{
const LineString *line = lines[i];
hasIntersection(seq, *(line->getCoordinatesRO()));
if (hasIntersectionVar) break;
}
return hasIntersectionVar;
}
bool
SegmentIntersectionTester::hasIntersection(
const CoordinateSequence &seq0, const CoordinateSequence &seq1)
{
for (unsigned i=1, ni=seq0.getSize(); i<ni; ++i)
{
const Coordinate &pt00 = seq0.getAt(i - 1);
const Coordinate &pt01 = seq0.getAt(i);
for (unsigned j=1, nj=seq1.getSize(); j<nj; ++j)
{
const Coordinate &pt10 = seq1.getAt(j-1);
const Coordinate &pt11 = seq1.getAt(j);
li.LineIntersector::computeIntersection(pt00, pt01,
pt10, pt11);
if (li.hasIntersection())
{
hasIntersectionVar = true;
goto out_of_loop;
}
}
}
out_of_loop:
return hasIntersectionVar;
}
} // namespace predicate
} // namespace operation
} // namespace geos
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