public List <SpatialObj <T> > WindowQuery(Rectangle window)
{
// Finds objects within a Rectangular range (window)
List <SpatialObj <T> > answer = new List <SpatialObj <T> >();
Queue <BUCoverNode <T> > searching_nodes = new Queue <BUCoverNode <T> >();
searching_nodes.Enqueue(rootNode);
while (searching_nodes.Count > 0)
{
BUCoverNode <T> current_node = searching_nodes.Dequeue();
if (current_node.IntersectsWith(window))
{
answer.AddRange(current_node.GetRangeQueryObj(window));
if (current_node.HasChildren())
{
foreach (BUCoverNode <T> child in current_node.GetChildren())
{
if (!searching_nodes.Contains(child))
{
searching_nodes.Enqueue(child);
}
}
}
}
}
return(answer);
}
public BUCoverNode <T> AddRectangle(SpatialObj <T> rect, bool reorganize = true)
{
BUCoverNode <T> deepest_field = null;
if (rootNode == null)
{
Size nodeSize = DetermineBoundingSize(rect);
rootNode = new BUCoverNode <T>(new Rectangle(rect.boundingBox.Center, nodeSize), Capacity, 0, pVal, null);
deepest_field = rootNode;
}
else
{
while (deepest_field == null)
{
deepest_field = FindContainingField(rect, rootNode);
if (deepest_field == null)
{
if (!rootNode.GetActualBounds().ContainsPoint(rect.boundingBox.Center))
{
rootNode = rootNode.CreateParent(rect.boundingBox.Center);
}
else
{
foreach (var corner in rect.boundingBox.GetCorners())
{
if (!rootNode.GetActualBounds().ContainsPoint(corner))
{
rootNode = rootNode.CreateParent(corner);
break;
}
}
}
}
}
}
if (deepest_field.IsFull() && !deepest_field.HasChildren())
{
PartitionField(deepest_field);
BUCoverNode <T> node = AddRectangle(rect);
if (reorganize)
{
ReorganizeOverflownNodes();
}
if (node != null)
{
return(node);
}
}
else
{
bool overflown = deepest_field.StoreRectangle(rect);
}
if (deepest_field != null)
{
Count += 1;
}
return(deepest_field);
}
private void MergeEmptyChildren(BUCoverNode <T> node)
{
if (node.HasChildren() && node.AreExistingChildrenEmpty())
{
node.MergeEmptyChildren();
}
if (node.IsRootNode() && IsEmpty())
{
rootNode = null;
return;
}
if (node.IsRootNode() || !node.IsEmpty() || node.HasChildren())
{
return;
}
MergeEmptyChildren(node.GetParent());
}
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);
}
private Dictionary <BUCoverNode <T>, SpatialObj <T> > FindNearestRectToPoint(Point p, BUCoverNode <T> node)
{
Dictionary <BUCoverNode <T>, SpatialObj <T> > answer_dict = new Dictionary <BUCoverNode <T>, SpatialObj <T> >();
SimplePriorityQueue <BUCoverNode <T> > searching_nodes = new SimplePriorityQueue <BUCoverNode <T> >();
searching_nodes.Enqueue(node, 0);
SpatialObj <T> answer = default(SpatialObj <T>);
BUCoverNode <T> answer_node = null;
bool used = false;
double min_distance_sq = rootNode.GetMaxDistance();
while (searching_nodes.Count > 0)
{
BUCoverNode <T> current_node = searching_nodes.Dequeue();
Dictionary <SpatialObj <T>, double> nearest_rect = current_node.GetNearestRectangle(p);
if (nearest_rect.Count > 0)
{
foreach (KeyValuePair <SpatialObj <T>, double> entry in nearest_rect)
{
if (entry.Value <= min_distance_sq || entry.Value < Statics.EPSILON)
{
min_distance_sq = entry.Value;
answer = entry.Key;
answer_node = current_node;
used = false;
if (min_distance_sq < Statics.EPSILON)
{
answer_dict.Add(answer_node, answer);
used = true;
}
}
}
}
if (current_node.HasChildren())
{
foreach (BUCoverNode <T> child in current_node.GetChildren())
{
double field_dist = child.GetDistanceToPointSq(p);
if (field_dist <= min_distance_sq)
{
searching_nodes.Enqueue(child, (float)field_dist);
}
}
}
}
if (!used)
{
answer_dict.Add(answer_node, answer);
}
return(answer_dict);
}
private void ReorganizeNode(BUCoverNode <T> node)
{
// After adding objects and creating new partitions, checks to see if any of the upper level objects can go deeper into the tree.
Queue <BUCoverNode <T> > all_nodes = new Queue <BUCoverNode <T> >();
all_nodes.Enqueue(node);
while (all_nodes.Count > 0)
{
List <SpatialObj <T> > rects_removed = new List <SpatialObj <T> >();
BUCoverNode <T> current_node = all_nodes.Dequeue();
foreach (SpatialObj <T> rect in current_node.GetOverflowObjs())
{
BUCoverNode <T> deepest_field = FindContainingField(rect, current_node);
if (!deepest_field.Equals(current_node))
{
bool overflown = deepest_field.StoreRectangle(rect);
rects_removed.Add(rect);
}
}
if (rects_removed.Count > 0)
{
current_node.DeleteRectangles(rects_removed, true);
}
if (current_node.HasChildren())
{
foreach (BUCoverNode <T> child in current_node.GetChildren())
{
all_nodes.Enqueue(child);
}
}
}
}
public bool IsEmpty()
{
return(rootNode == null || (rootNode.IsEmpty() && !rootNode.HasChildren()));
}