public List<T> findClosestNeighbours(double x, double y, double radius, int maxCount) {
NearestNeighborGatherer<T> gatherer = new NearestNeighborGatherer<>(x, y, radius, maxCount);
if (root != null) {
root.findNearestNeighbors(0, gatherer);
}
return gatherer.getResults();
}
