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);
}
public CoverNode <T> AddRectangle(SpatialObj <T> rect, bool reorganize = true)
{
CoverNode <T> deepest_field = FindContainingField(rect, rootNode);
if (deepest_field.IsFull() && !deepest_field.HasChildren())
{
PartitionField(deepest_field);
CoverNode <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);
}
public bool CanSink(SpatialObj <T> rect)
{
Rectangle OperatingBounds = GetOperatingBounds();
Rectangle ActualBounds = GetActualBounds();
return((rect.boundingBox.Width <= OperatingBounds.Width / 2) && (rect.boundingBox.Height <= OperatingBounds.Height / 2) &&
Math.Min(ActualBounds.Height, ActualBounds.Width) > 1);
}
private SpatialObj <T> RemoveRectangle(SpatialObj <T> rect, CoverNode <T> node)
{
if (node.DeleteRectangle(rect))
{
Count -= 1;
}
MergeEmptyChildren(node);
return(rect);
}
private Size DetermineBoundingSize(SpatialObj <T> obj)
{
int size = 1;
while (size < Math.Max(obj.boundingBox.Width, obj.boundingBox.Height))
{
size *= 2;
}
return(new Size(size, size));
}
public bool DeleteRectangle(SpatialObj <T> rect, bool overflow_only = false)
{
int oldCount = Count();
if (!overflow_only)
{
StoredObjs.RemoveAll(x => x.objInstance.Equals(rect.objInstance));
}
OverflowObjs.RemoveAll(x => x.objInstance.Equals(rect.objInstance));
return(oldCount > Count());
}
private Dictionary <CoverNode <T>, SpatialObj <T> > FindNearestRectToPoint(Point p, CoverNode <T> node)
{
Dictionary <CoverNode <T>, SpatialObj <T> > answer_dict = new Dictionary <CoverNode <T>, SpatialObj <T> >();
SimplePriorityQueue <CoverNode <T> > searching_nodes = new SimplePriorityQueue <CoverNode <T> >();
searching_nodes.Enqueue(node, 0);
SpatialObj <T> answer = default(SpatialObj <T>);
CoverNode <T> answer_node = null;
bool used = false;
double min_distance_sq = rootNode.GetMaxDistance();
while (searching_nodes.Count > 0)
{
CoverNode <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 (CoverNode <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);
}
public bool StoreRectangle(SpatialObj <T> rect)
{
if (CanSink(rect))
{
OverflowObjs.Add(rect);
}
else
{
StoredObjs.Add(rect);
}
return(IsOverflown());
}
public SpatialObj <T> FindNearestObjAndRemove(Point p)
{
SpatialObj <T> obj = default(SpatialObj <T>);
CoverNode <T> node = null;
foreach (KeyValuePair <CoverNode <T>, SpatialObj <T> > entry in FindNearestRectToPoint(p, rootNode))
{
obj = entry.Value;
node = entry.Key;
}
if (node != null)
{
return(RemoveRectangle(obj, node));
}
return(obj);
}
public SpatialObj <T> RemoveObject(SpatialObj <T> rect)
{
CoverNode <T> node = null;
foreach (KeyValuePair <CoverNode <T>, SpatialObj <T> > entry in FindNearestRectToPoint(rect.boundingBox.Center, rootNode))
{
if (entry.Value.Equals(rect))
{
node = entry.Key;
}
}
if (node != null)
{
return(RemoveRectangle(rect, node));
}
return(rect);
}
public CoverNode <T> FindContainingField(SpatialObj <T> rect, CoverNode <T> starting_node)
{
if (starting_node.IsPointInNode(rect.boundingBox.Center))
{
bool contained_in_node = starting_node.IsObjectInNode(rect);
if (contained_in_node && !starting_node.CanSink(rect))
{
return(starting_node);
}
foreach (CoverNode <T> child in starting_node.GetChildren())
{
var potential_node = FindContainingField(rect, child);
if (potential_node != null)
{
return(potential_node);
}
}
if (contained_in_node)
{
return(starting_node);
}
}
return(null);
}
public void SetObj(SpatialObj <T> o)
{
obj = o;
isNode = false;
}
public bool IsObjectInNode(SpatialObj <T> obj)
{
return(GetOperatingBounds().ContainsRect(obj.boundingBox));
}
/// <summary>
/// Finds and removes the given object from the tree.
/// </summary>
/// <param name="obj">Spatial object to be removed from the tree.</param>
public void Remove(T obj)
{
SpatialObj <T> s_obj = new SpatialObj <T>(obj);
fieldTree.RemoveObject(s_obj);
}
/// <summary>
/// Adds an object to the tree.
/// </summary>
/// <param name="obj">Spatial type object to be added to the tree. Must implement ISpatial interface.</param>
public void Add(T obj)
{
SpatialObj <T> s_obj = new SpatialObj <T>(obj);
fieldTree.AddRectangle(s_obj);
}
