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/**********************************************************************
* $Id: MCIndexPointSnapper.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 Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
*
* Last port: noding/snapround/MCIndexPointSnapper.java rev. 1.2 (JTS-1.7)
*
**********************************************************************/
#include <geos/noding/snapround/MCIndexPointSnapper.h>
#include <geos/noding/snapround/HotPixel.h>
#include <geos/noding/snapround/SimpleSnapRounder.h>
#include <geos/noding/SegmentString.h>
#include <geos/spatialIndex.h>
#include <geos/geom/Envelope.h>
#include <geos/index/chain/MonotoneChainSelectAction.h>
#include <geos/index/chain/MonotoneChain.h>
#include <algorithm>
using namespace geos::index;
using namespace geos::geom;
namespace geos {
namespace noding { // geos.noding
namespace snapround { // geos.noding.snapround
class HotPixelSnapAction: public index::chain::MonotoneChainSelectAction {
private:
const HotPixel& hotPixel;
SegmentString* parentEdge;
unsigned int vertexIndex;
bool isNodeAddedVar;
public:
HotPixelSnapAction(const HotPixel& nHotPixel,
SegmentString* nParentEdge,
unsigned int nVertexIndex)
:
hotPixel(nHotPixel),
parentEdge(nParentEdge),
vertexIndex(nVertexIndex),
isNodeAddedVar(false)
{}
bool isNodeAdded() const { return isNodeAddedVar; }
void select(chain::MonotoneChain& mc, unsigned int startIndex)
{
// This is casting away 'constness'!
SegmentString& ss = *(static_cast<SegmentString*>(mc.getContext()));
// don't snap a vertex to itself
if ( parentEdge ) {
if (&ss == parentEdge && startIndex == vertexIndex) return;
}
isNodeAddedVar = SimpleSnapRounder::addSnappedNode(hotPixel, ss, startIndex);
}
void select(LineSegment* ls) {}
};
class MCIndexPointSnapperVisitor: public ItemVisitor {
private:
const Envelope& pixelEnv;
chain::MonotoneChainSelectAction& action;
public:
MCIndexPointSnapperVisitor(const Envelope& nPixelEnv, HotPixelSnapAction& nAction)
:
pixelEnv(nPixelEnv),
action(nAction)
{}
virtual ~MCIndexPointSnapperVisitor() {}
void visitItem(void* item) {
chain::MonotoneChain& testChain =
*(static_cast<chain::MonotoneChain*>(item));
testChain.select(pixelEnv, action);
}
};
/* public */
bool
MCIndexPointSnapper::snap(const HotPixel& hotPixel,
SegmentString* parentEdge,
unsigned int vertexIndex)
{
const Envelope& pixelEnv = hotPixel.getSafeEnvelope();
HotPixelSnapAction hotPixelSnapAction(hotPixel, parentEdge, vertexIndex);
MCIndexPointSnapperVisitor visitor(pixelEnv, hotPixelSnapAction);
index.query(&pixelEnv, visitor);
return hotPixelSnapAction.isNodeAdded();
}
} // namespace geos.noding.snapround
} // namespace geos.noding
} // namespace geos
/**********************************************************************
* $Log$
* Revision 1.9 2006/03/24 09:25:02 strk
* Bugs #77 and #76: missing <algorithm>
*
* Revision 1.8 2006/03/22 18:12:32 strk
* indexChain.h header split.
*
* Revision 1.7 2006/03/15 09:51:13 strk
* streamlined headers usage
*
* Revision 1.6 2006/03/14 12:55:56 strk
* Headers split: geomgraphindex.h, nodingSnapround.h
*
* Revision 1.5 2006/02/21 16:53:49 strk
* MCIndexPointSnapper, MCIndexSnapRounder
*
* Revision 1.4 2006/02/20 10:14:18 strk
* - namespaces geos::index::*
* - Doxygen documentation cleanup
*
* Revision 1.3 2006/02/19 19:46:49 strk
* Packages <-> namespaces mapping for most GEOS internal code (uncomplete, but working). Dir-level libs for index/ subdirs.
*
* Revision 1.2 2006/02/18 21:08:09 strk
* - new CoordinateSequence::applyCoordinateFilter method (slow but useful)
* - SegmentString::getCoordinates() doesn't return a clone anymore.
* - SegmentString::getCoordinatesRO() obsoleted.
* - SegmentString constructor does not promises constness of passed
* CoordinateSequence anymore.
* - NEW ScaledNoder class
* - Stubs for MCIndexPointSnapper and MCIndexSnapRounder
* - Simplified internal interaces of OffsetCurveBuilder and OffsetCurveSetBuilder
*
* Revision 1.1 2006/02/14 13:28:26 strk
* New SnapRounding code ported from JTS-1.7 (not complete yet).
* Buffer op optimized by using new snaprounding code.
* Leaks fixed in XMLTester.
*
**********************************************************************/
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