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/**********************************************************************
* $Id: QuadTreeKey.cpp,v 1.7 2004/11/01 16:43:04 strk Exp $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* 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/indexQuadtree.h>
#ifndef DEBUG
#define DEBUG 0
#endif
namespace geos {
int QuadTreeKey::computeQuadLevel(Envelope *env){
double dx=env->getWidth();
double dy=env->getHeight();
double dMax=dx>dy?dx:dy;
int level=DoubleBits::exponent(dMax)+1;
#if DEBUG
cerr<<"Maxdelta:"<<dMax<<" exponent:"<<(level-1)<<endl;
#endif
return level;
}
QuadTreeKey::QuadTreeKey(Envelope *itemEnv){
pt=new Coordinate();
level=0;
env=NULL;
computeKey(itemEnv);
}
QuadTreeKey::~QuadTreeKey(){
delete pt;
delete env;
}
Coordinate* QuadTreeKey::getPoint() {
return pt;
}
int QuadTreeKey::getLevel() {
return level;
}
Envelope* QuadTreeKey::getEnvelope() {
return env;
}
Coordinate* QuadTreeKey::getCentre() {
return new Coordinate(
(env->getMinX()+env->getMaxX())/2,
(env->getMinY()+env->getMaxY())/2);
}
/**
* return a square envelope containing the argument envelope,
* whose extent is a power of two and which is based at a power of 2
*/
void QuadTreeKey::computeKey(Envelope *itemEnv) {
level=computeQuadLevel(itemEnv);
env=new Envelope();
computeKey(level,itemEnv);
// MD - would be nice to have a non-iterative form of this algorithm
while (!env->contains(itemEnv)) {
level+=1;
computeKey(level,itemEnv);
}
#if DEBUG
cerr<<"QuadTreeKey::computeKey:"<<endl;
cerr<<" itemEnv: "<<itemEnv->toString()<<endl;
cerr<<" keyEnv: "<<env->toString()<<endl;
cerr<<" keyLvl: "<<level<<endl;
#endif
}
void
QuadTreeKey::computeKey(int level,Envelope *itemEnv)
{
double quadSize=DoubleBits::powerOf2(level);
//double quadSize=pow2.power(level);
pt->x=floor(itemEnv->getMinX()/quadSize)*quadSize;
pt->y=floor(itemEnv->getMinY()/quadSize)*quadSize;
env->init(pt->x,pt->x+quadSize,pt->y,pt->y+quadSize);
}
} // namespace geos
/**********************************************************************
* $Log: QuadTreeKey.cpp,v $
* Revision 1.7 2004/11/01 16:43:04 strk
* Added Profiler code.
* Temporarly patched a bug in DoubleBits (must check drawbacks).
* Various cleanups and speedups.
*
* Revision 1.6 2004/07/02 13:28:27 strk
* Fixed all #include lines to reflect headers layout change.
* Added client application build tips in README.
*
* Revision 1.5 2003/11/07 01:23:42 pramsey
* Add standard CVS headers licence notices and copyrights to all cpp and h
* files.
*
*
**********************************************************************/
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