public CoverNode LookupChild(Point p)
{
int childnum = HelperFuncs.LookupChildCover(p, this);
return(getSingleChild(childnum));
}
public PartitionNode LookupChild(Point p)
{
int childnum = HelperFuncs.LookupChildPartition(p, this);
return(getSingleChild(childnum));
}