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/**********************************************************************
* $Id: CommonBitsRemover.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.
*
**********************************************************************/
#include <geos/precision/CommonBitsRemover.h>
#include <geos/precision/CommonBits.h>
// for CommonCoordinateFilter inheritance
#include <geos/geom/CoordinateFilter.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/Geometry.h>
#include <cassert>
#ifndef GEOS_DEBUG
#define GEOS_DEBUG 0
#endif
#ifdef GEOS_DEBUG
#include <iostream>
#endif
using namespace geos::geom;
namespace geos {
namespace precision { // geos.precision
class Translater: public geom::CoordinateFilter {
private:
geom::Coordinate trans;
public:
Translater(geom::Coordinate &newTrans)
:
trans(newTrans)
{}
void filter_ro(const geom::Coordinate *coord){ assert(0); }; //Not used
void filter_rw(geom::Coordinate *coord) const
{
coord->x += trans.x;
coord->y += trans.y;
}
};
class CommonCoordinateFilter: public geom::CoordinateFilter {
private:
CommonBits commonBitsX;
CommonBits commonBitsY;
public:
void filter_rw(geom::Coordinate *coord) const
{
// CommonCoordinateFilter is a read-only filter
assert(0);
}
void filter_ro(const geom::Coordinate *coord)
{
commonBitsX.add(coord->x);
commonBitsY.add(coord->y);
}
void getCommonCoordinate(geom::Coordinate& c)
{
c=Coordinate(commonBitsX.getCommon(),
commonBitsY.getCommon());
}
};
CommonBitsRemover::CommonBitsRemover()
{
ccFilter=new CommonCoordinateFilter();
}
CommonBitsRemover::~CommonBitsRemover()
{
delete ccFilter;
}
/**
* Add a geometry to the set of geometries whose common bits are
* being computed. After this method has executed the
* common coordinate reflects the common bits of all added
* geometries.
*
* @param geom a Geometry to test for common bits
*/
void
CommonBitsRemover::add(const Geometry *geom)
{
geom->apply_ro(ccFilter);
ccFilter->getCommonCoordinate(commonCoord);
}
/**
* The common bits of the Coordinates in the supplied Geometries.
*/
Coordinate&
CommonBitsRemover::getCommonCoordinate()
{
return commonCoord;
}
/**
* Removes the common coordinate bits from a Geometry.
* The coordinates of the Geometry are changed.
*
* @param geom the Geometry from which to remove the common coordinate bits
* @return the shifted Geometry
*/
Geometry*
CommonBitsRemover::removeCommonBits(Geometry *geom)
{
if (commonCoord.x == 0.0 && commonCoord.y == 0.0)
return geom;
Coordinate invCoord(commonCoord);
invCoord.x = -invCoord.x;
invCoord.y = -invCoord.y;
Translater trans(invCoord);
geom->apply_rw(&trans);
geom->geometryChanged();
#if GEOS_DEBUG
std::cerr << "CommonBits removed: " << *geom << std::endl;
#endif
return geom;
}
/**
* Adds the common coordinate bits back into a Geometry.
* The coordinates of the Geometry are changed.
*
* @param geom the Geometry to which to add the common coordinate bits
* @return the shifted Geometry
*/
Geometry*
CommonBitsRemover::addCommonBits(Geometry *geom)
{
#if GEOS_DEBUG
std::cerr << "CommonBits before add: " << *geom << std::endl;
#endif
Translater trans(commonCoord);
geom->apply_rw(&trans);
geom->geometryChanged();
#if GEOS_DEBUG
std::cerr << "CommonBits added: " << *geom << std::endl;
#endif
return geom;
}
} // namespace geos.precision
} // namespace geos
/**********************************************************************
* $Log$
* Revision 1.9 2006/04/07 08:28:25 strk
* debugging lines, assertions
*
* Revision 1.8 2006/04/06 14:36:51 strk
* Cleanup in geos::precision namespace (leaks plugged, auto_ptr use, ...)
*
* Revision 1.7 2006/03/23 09:17:19 strk
* precision.h header split, minor optimizations
*
* Revision 1.6 2006/03/06 19:40:47 strk
* geos::util namespace. New GeometryCollection::iterator interface, many cleanups.
*
* Revision 1.5 2006/03/02 16:21:26 strk
* geos::precision namespace added
*
**********************************************************************/
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