/**
* Creates the parent level for the given child level. First, orders the items
* by the x-values of the midpoints, and groups them into vertical slices.
* For each slice, orders the items by the y-values of the midpoints, and
* group them into runs of size M (the node capacity). For each run, creates
* a new (parent) node.
*/
vector<Boundable*>*
STRtree::createParentBoundables(vector<Boundable*> *childBoundables, int newLevel)
{
Assert::isTrue(!childBoundables->empty());
int minLeafCount=(int) ceil((double)childBoundables->size()/(double)getNodeCapacity());
vector<Boundable*> *sortedChildBoundables=sortBoundables(childBoundables);
vector<vector<Boundable*>*>* verticalSlicesV = verticalSlices(sortedChildBoundables,(int)ceil(sqrt((double)minLeafCount)));
delete sortedChildBoundables;
vector<Boundable*> *ret;
ret = createParentBoundablesFromVerticalSlices(verticalSlicesV, newLevel);
for (unsigned int i=0; i<verticalSlicesV->size(); i++)
{
vector<Boundable *>*inner = (*verticalSlicesV)[i];
//for (unsigned int j=0; j<inner->size(); j++)
//{
// some of these might be provided,
// some of these might be created
//delete (*inner)[j];
//}
delete inner;
}
delete verticalSlicesV;
return ret;
}
/*private*/
std::auto_ptr<BoundableList>
STRtree::createParentBoundables(BoundableList* childBoundables, int newLevel)
{
assert(!childBoundables->empty());
int minLeafCount=(int) ceil((double)childBoundables->size()/(double)getNodeCapacity());
std::auto_ptr<BoundableList> sortedChildBoundables ( sortBoundables(childBoundables) );
std::auto_ptr< vector<BoundableList*> > verticalSlicesV (
verticalSlices(sortedChildBoundables.get(), (int)ceil(sqrt((double)minLeafCount)))
);
std::auto_ptr<BoundableList> ret (
createParentBoundablesFromVerticalSlices(verticalSlicesV.get(), newLevel)
);
for (size_t i=0, vssize=verticalSlicesV->size(); i<vssize; ++i)
{
BoundableList* inner = (*verticalSlicesV)[i];
delete inner;
}
return ret;
}