public Tuple <BUCoverNode <T>, SpatialObj <T> > IncrementalNNFindNext()
{
if (incrNN_queue is null)
{
return(null);
}
while (incrNN_queue.Count > 0)
{
NodeOrObj current_element = incrNN_queue.Dequeue();
while (incrNN_queue.Count > 0 && incrNN_queue.First().Equals(current_element))
{
incrNN_queue.Dequeue();
}
if (current_element.IsObj())
{
return(Tuple.Create(current_element.GetNode(), current_element.GetObj()));
}
else
{
BUCoverNode <T> current_node = current_element.GetNode();
double current_dist = current_node.GetDistanceToPointSq(incrNN_origin);
if (!current_node.IsEmpty())
{
foreach (SpatialObj <T> obj in current_node.GetAllObjects())
{
double distance = obj.boundingBox.GetDistanceSqToPoint(incrNN_origin);
if (distance >= current_dist)
{
NodeOrObj obj_nodeOrObj = new NodeOrObj();
obj_nodeOrObj.SetNode(current_node);
obj_nodeOrObj.SetObj(obj);
incrNN_queue.Enqueue(obj_nodeOrObj, (float)distance);
}
}
}
if (current_node.HasChildren())
{
foreach (BUCoverNode <T> child_node in current_node.GetChildren())
{
double distance = child_node.GetDistanceToPointSq(incrNN_origin);
if (distance >= current_dist)
{
NodeOrObj node_nodeOrObj = new NodeOrObj();
node_nodeOrObj.SetNode(child_node);
incrNN_queue.Enqueue(node_nodeOrObj, (float)distance);
}
}
}
}
}
return(null);
}