GEOS
3.9.0dev

A pair of Boundables, whose leaf items support a distance metric between them. More...
#include <BoundablePair.h>
Public Types  
typedef std::priority_queue < BoundablePair *, std::vector < BoundablePair * > , BoundablePairQueueCompare >  BoundablePairQueue 
Public Member Functions  
BoundablePair (const Boundable *boundable1, const Boundable *boundable2, ItemDistance *itemDistance)  
const Boundable *  getBoundable (int i) const 
double  distance () const 
Computes the distance between the Boundables in this pair. The boundables are either composites or leaves. More...  
double  getDistance () const 
Gets the minimum possible distance between the Boundables in this pair. More...  
bool  isLeaves () const 
double  maximumDistance () 
Computes the maximum distance between any two items in the pair of nodes. More...  
void  expandToQueue (BoundablePairQueue &, double minDistance) 
void  expand (const Boundable *bndComposite, const Boundable *bndOther, bool isFlipped, BoundablePairQueue &priQ, double minDistance) 
Static Public Member Functions  
static bool  isComposite (const Boundable *item) 
static double  area (const Boundable *b) 
A pair of Boundables, whose leaf items support a distance metric between them.
Used to compute the distance between the members, and to expand a member relative to the other in order to produce new branches of the BranchandBound evaluation tree. Provides an ordering based on the distance between the members, which allows building a priority queue by minimum distance.
double geos::index::strtree::BoundablePair::distance  (  )  const 
Computes the distance between the Boundables in this pair. The boundables are either composites or leaves.
If either is composite, the distance is computed as the minimum distance between the bounds. If both are leaves, the distance is computed by ItemDistance::distance(const ItemBoundable* item1, const ItemBoundable* item2).
const Boundable* geos::index::strtree::BoundablePair::getBoundable  (  int  i  )  const 
Gets one of the member Boundables in the pair (indexed by [0, 1]).
i  the index of the member to return (0 or 1) 
double geos::index::strtree::BoundablePair::getDistance  (  )  const 
Gets the minimum possible distance between the Boundables in this pair.
If the members are both items, this will be the exact distance between them. Otherwise, this distance will be a lower bound on the distances between the items in the members.
bool geos::index::strtree::BoundablePair::isLeaves  (  )  const 
Tests if both elements of the pair are leaf nodes
double geos::index::strtree::BoundablePair::maximumDistance  (  ) 
Computes the maximum distance between any two items in the pair of nodes.