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/**********************************************************************
* $Id: SimpleGeometryPrecisionReducer.cpp 1820 2006-09-06 16:54:23Z mloskot $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* 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.
*
***********************************************************************
*
* Last port: precision/SimpleGeometryPrecisionReducer.cpp rev. 1.10 (JTS-1.7)
*
**********************************************************************/
#include <geos/precision/SimpleGeometryPrecisionReducer.h>
#include <geos/geom/util/GeometryEditor.h>
#include <geos/geom/util/CoordinateOperation.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/CoordinateSequenceFactory.h>
#include <geos/geom/PrecisionModel.h>
#include <geos/geom/GeometryFactory.h>
#include <geos/geom/LineString.h>
#include <geos/geom/LinearRing.h>
#include <vector>
using namespace std;
using namespace geos::geom;
using namespace geos::geom::util;
namespace geos {
namespace precision { // geos.precision
class PrecisionReducerCoordinateOperation: public geom::util::CoordinateOperation {
using CoordinateOperation::edit;
private:
SimpleGeometryPrecisionReducer *sgpr;
public:
PrecisionReducerCoordinateOperation(SimpleGeometryPrecisionReducer *newSgpr);
CoordinateSequence* edit(const CoordinateSequence *coordinates, const Geometry *geom);
};
PrecisionReducerCoordinateOperation::PrecisionReducerCoordinateOperation(SimpleGeometryPrecisionReducer *newSgpr)
{
sgpr=newSgpr;
}
CoordinateSequence*
PrecisionReducerCoordinateOperation::edit(const CoordinateSequence *cs, const Geometry *geom)
{
if (cs->getSize()==0) return NULL;
unsigned int csSize=cs->getSize();
vector<Coordinate> *vc = new vector<Coordinate>(csSize);
// copy coordinates and reduce
for (unsigned int i=0; i<csSize; ++i) {
Coordinate coord=cs->getAt(i);
sgpr->getPrecisionModel()->makePrecise(&coord);
//reducedCoords->setAt(*coord,i);
(*vc)[i] = coord;
}
CoordinateSequence *reducedCoords = geom->getFactory()->getCoordinateSequenceFactory()->create(vc);
// remove repeated points, to simplify returned geometry as much as possible
CoordinateSequence *noRepeatedCoords=CoordinateSequence::removeRepeatedPoints(reducedCoords);
/**
* Check to see if the removal of repeated points
* collapsed the coordinate List to an invalid length
* for the type of the parent geometry.
* It is not necessary to check for Point collapses, since the coordinate list can
* never collapse to less than one point.
* If the length is invalid, return the full-length coordinate array
* first computed, or null if collapses are being removed.
* (This may create an invalid geometry - the client must handle this.)
*/
unsigned int minLength = 0;
if (typeid(*geom)==typeid(LineString)) minLength = 2;
if (typeid(*geom)==typeid(LinearRing)) minLength = 4;
CoordinateSequence *collapsedCoords = reducedCoords;
if (sgpr->getRemoveCollapsed()) collapsedCoords=NULL;
// return null or orginal length coordinate array
if (noRepeatedCoords->getSize()<minLength) {
delete noRepeatedCoords;
return collapsedCoords;
}
// ok to return shorter coordinate array
delete reducedCoords;
return noRepeatedCoords;
}
//---------------------------------------------------------------
SimpleGeometryPrecisionReducer::SimpleGeometryPrecisionReducer(
const PrecisionModel *pm)
:
newPrecisionModel(pm),
removeCollapsed(true)
{
//removeCollapsed = true;
//changePrecisionModel = false;
//newPrecisionModel = pm;
}
/**
* Sets whether the reduction will result in collapsed components
* being removed completely, or simply being collapsed to an (invalid)
* Geometry of the same type.
*
* @param removeCollapsed if <code>true</code> collapsed components will be removed
*/
void
SimpleGeometryPrecisionReducer::setRemoveCollapsedComponents(bool nRemoveCollapsed)
{
removeCollapsed=nRemoveCollapsed;
}
const PrecisionModel*
SimpleGeometryPrecisionReducer::getPrecisionModel()
{
return newPrecisionModel;
}
bool
SimpleGeometryPrecisionReducer::getRemoveCollapsed()
{
return removeCollapsed;
}
Geometry*
SimpleGeometryPrecisionReducer::reduce(const Geometry *geom)
{
GeometryEditor geomEdit;
PrecisionReducerCoordinateOperation prco(this);
Geometry *g=geomEdit.edit(geom, &prco);
return g;
}
} // namespace geos.precision
} // namespace geos
/**********************************************************************
* $Log$
* Revision 1.14 2006/04/03 13:56:54 strk
* Made externally-owned PrecisionModel const
*
* Revision 1.13 2006/03/23 09:17:19 strk
* precision.h header split, minor optimizations
*
**********************************************************************/
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