public BDNode[] Nearest(Point p, int n)
{
BDNode[] nbrs = new BDNode[n];
NearestNeighborList nnl = new NearestNeighborList(n);
Rect rect = Rect.inifiniteRect();
double max_dist_sqd = Double.MaxValue;
Point keyp = new Point(p);
nearest(root, p, rect, max_dist_sqd, 0, nnl);
for (int i = 0; i < n; ++i)
{
BDNode kd = (BDNode)nnl.removeHighest();
nbrs[n - i - 1] = kd;
}
return(nbrs);
}
public TwoDNode[] Nearest(Point key, int n)
{
TwoDNode[] nbrs = new TwoDNode[n];
NearestNeighborList nnl = new NearestNeighborList(n);
Rect rect = Rect.inifiniteRect();
double max_dist_sqd = Double.MaxValue;
Point keyp = new Point(key);
TwoDNode.nnbr(root, keyp, rect, max_dist_sqd, 0, nnl);
for (int i = 0; i < n; ++i)
{
TwoDNode kd = (TwoDNode)nnl.removeHighest();
nbrs[n - i - 1] = kd;
}
return nbrs;
}
private static void nearest(BDNode tree, Point target, Rect rect, double max_dist_sqd, int level, NearestNeighborList nnl)
{
if (tree == null)
{
return;
}
Point pivot = tree.Coord;
double pivot_to_target = pivot.SquareDistance(target);
Rect left_rect = rect;
Rect right_rect = new Rect(rect);
bool target_in_left;
if (level % 2 == 0)
{
left_rect.max.X = pivot.X;
right_rect.min.X = pivot.X;
target_in_left = target.X < pivot.X;
}
else
{
left_rect.max.Y = pivot.Y;
right_rect.min.Y = pivot.Y;
target_in_left = target.Y < pivot.Y;
}
BDNode nearer_node, further_node;
Rect nearer_rect, further_rect;
if (target_in_left)
{
nearer_node = tree.Left;
nearer_rect = left_rect;
further_node = tree.Right;
further_rect = right_rect;
}
else
{
nearer_node = tree.Right;
nearer_rect = right_rect;
further_node = tree.Left;
further_rect = left_rect;
}
nearest(nearer_node, target, nearer_rect, max_dist_sqd, level + 1, nnl);
BDNode nearest_node = (BDNode)nnl.getHighest();
double dist_sqd;
if (!nnl.isCapacityReached())
{
dist_sqd = Double.MaxValue;
}
else
{
dist_sqd = nnl.getMaxPriority();
}
max_dist_sqd = Math.Min(max_dist_sqd, dist_sqd);
Point closest = further_rect.Closest(target);
if (closest.Distance(target) < Math.Sqrt(max_dist_sqd))
{
if (pivot_to_target < dist_sqd)
{
nearest_node = tree;
dist_sqd = pivot_to_target;
nnl.insert(tree, dist_sqd);
if (nnl.isCapacityReached())
{
max_dist_sqd = nnl.getMaxPriority();
}
else
{
max_dist_sqd = Double.MaxValue;
}
}
nearest(further_node, target, further_rect, max_dist_sqd, level + 1, nnl);
BDNode temp_nearest = (BDNode)nnl.getHighest();
double temp_dist_sqd = nnl.getMaxPriority();
if (temp_dist_sqd < dist_sqd)
{
nearest_node = temp_nearest;
dist_sqd = temp_dist_sqd;
}
}
else if (pivot_to_target < max_dist_sqd)
{
nearest_node = tree;
dist_sqd = pivot_to_target;
}
}
#pragma warning restore 0642
public static void nnbr(TwoDNode kd, Point target, Rect hr, double max_dist_sqd, int lev, NearestNeighborList nnl)
{
if (kd == null)
{
return;
}
int s = lev % 2;
Point pivot = kd.key;
double pivot_to_target = pivot.SquareDistance(target);
Rect left_r = hr;
Rect right_r = new Rect(hr);
bool target_in_left;
if (s == 0)
{
left_r.max.X = pivot.X;
right_r.min.X = pivot.X;
target_in_left = target.X < pivot.X;
}
else
{
left_r.max.Y = pivot.Y;
right_r.min.Y = pivot.Y;
target_in_left = target.Y < pivot.Y;
}
TwoDNode nearer_node;
Rect nearer_rect;
TwoDNode further_node;
Rect further_rect;
if (target_in_left)
{
nearer_node = kd.left;
nearer_rect = left_r;
further_node = kd.right;
further_rect = right_r;
}
else
{
nearer_node = kd.right;
nearer_rect = right_r;
further_node = kd.left;
further_rect = left_r;
}
nnbr(nearer_node, target, nearer_rect, max_dist_sqd, lev + 1, nnl);
TwoDNode nearest = (TwoDNode)nnl.getHighest();
double dist_sqd;
if (!nnl.isCapacityReached())
{
dist_sqd = Double.MaxValue;
}
else
{
dist_sqd = nnl.getMaxPriority();
}
max_dist_sqd = Math.Min(max_dist_sqd, dist_sqd);
Point closest = further_rect.Closest(target);
if (closest.Distance(target) < Math.Sqrt(max_dist_sqd))
{
if (pivot_to_target < dist_sqd)
{
nearest = kd;
dist_sqd = pivot_to_target;
if (!kd.deleted)
{
nnl.insert(kd, dist_sqd);
}
if (nnl.isCapacityReached())
{
max_dist_sqd = nnl.getMaxPriority();
}
else
{
max_dist_sqd = Double.MaxValue;
}
}
nnbr(further_node, target, further_rect, max_dist_sqd, lev + 1, nnl);
TwoDNode temp_nearest = (TwoDNode)nnl.getHighest();
double temp_dist_sqd = nnl.getMaxPriority();
if (temp_dist_sqd < dist_sqd)
{
nearest = temp_nearest;
dist_sqd = temp_dist_sqd;
}
}
else if (pivot_to_target < max_dist_sqd)
{
nearest = kd;
dist_sqd = pivot_to_target;
}
}
private static void nearest(BDNode tree, Point target, Rect rect, double max_dist_sqd, int level, NearestNeighborList nnl)
{
if (tree == null)
return;
Point pivot = tree.Coord;
double pivot_to_target = pivot.SquareDistance(target);
Rect left_rect = rect;
Rect right_rect = new Rect(rect);
bool target_in_left;
if (level % 2 == 0)
{
left_rect.max.X = pivot.X;
right_rect.min.X = pivot.X;
target_in_left = target.X < pivot.X;
}
else
{
left_rect.max.Y = pivot.Y;
right_rect.min.Y = pivot.Y;
target_in_left = target.Y < pivot.Y;
}
BDNode nearer_node, further_node;
Rect nearer_rect, further_rect;
if (target_in_left)
{
nearer_node = tree.Left;
nearer_rect = left_rect;
further_node = tree.Right;
further_rect = right_rect;
}
else
{
nearer_node = tree.Right;
nearer_rect = right_rect;
further_node = tree.Left;
further_rect = left_rect;
}
nearest(nearer_node, target, nearer_rect, max_dist_sqd, level + 1, nnl);
BDNode nearest_node = (BDNode)nnl.getHighest();
double dist_sqd;
if (!nnl.isCapacityReached())
dist_sqd = Double.MaxValue;
else
dist_sqd = nnl.getMaxPriority();
max_dist_sqd = Math.Min(max_dist_sqd, dist_sqd);
Point closest = further_rect.Closest(target);
if (closest.Distance(target) < Math.Sqrt(max_dist_sqd))
{
if (pivot_to_target < dist_sqd)
{
nearest_node = tree;
dist_sqd = pivot_to_target;
nnl.insert(tree, dist_sqd);
if (nnl.isCapacityReached())
max_dist_sqd = nnl.getMaxPriority();
else
max_dist_sqd = Double.MaxValue;
}
nearest(further_node, target, further_rect, max_dist_sqd, level + 1, nnl);
BDNode temp_nearest = (BDNode)nnl.getHighest();
double temp_dist_sqd = nnl.getMaxPriority();
if (temp_dist_sqd < dist_sqd)
{
nearest_node = temp_nearest;
dist_sqd = temp_dist_sqd;
}
}
else if (pivot_to_target < max_dist_sqd)
{
nearest_node = tree;
dist_sqd = pivot_to_target;
}
}
#pragma warning restore 0642
public static void nnbr(TwoDNode kd, Point target, Rect hr, double max_dist_sqd, int lev, NearestNeighborList nnl)
{
if (kd == null)
return;
int s = lev % 2;
Point pivot = kd.key;
double pivot_to_target = pivot.SquareDistance(target);
Rect left_r = hr;
Rect right_r = new Rect(hr);
bool target_in_left;
if (s == 0)
{
left_r.max.X = pivot.X;
right_r.min.X = pivot.X;
target_in_left = target.X < pivot.X;
}
else
{
left_r.max.Y = pivot.Y;
right_r.min.Y = pivot.Y;
target_in_left = target.Y < pivot.Y;
}
TwoDNode nearer_node;
Rect nearer_rect;
TwoDNode further_node;
Rect further_rect;
if (target_in_left)
{
nearer_node = kd.left;
nearer_rect = left_r;
further_node = kd.right;
further_rect = right_r;
}
else
{
nearer_node = kd.right;
nearer_rect = right_r;
further_node = kd.left;
further_rect = left_r;
}
nnbr(nearer_node, target, nearer_rect, max_dist_sqd, lev + 1, nnl);
TwoDNode nearest = (TwoDNode)nnl.getHighest();
double dist_sqd;
if (!nnl.isCapacityReached())
dist_sqd = Double.MaxValue;
else
dist_sqd = nnl.getMaxPriority();
max_dist_sqd = Math.Min(max_dist_sqd, dist_sqd);
Point closest = further_rect.Closest(target);
if (closest.Distance(target) < Math.Sqrt(max_dist_sqd))
{
if (pivot_to_target < dist_sqd)
{
nearest = kd;
dist_sqd = pivot_to_target;
if (!kd.deleted)
nnl.insert(kd, dist_sqd);
if (nnl.isCapacityReached())
max_dist_sqd = nnl.getMaxPriority();
else
max_dist_sqd = Double.MaxValue;
}
nnbr(further_node, target, further_rect, max_dist_sqd, lev + 1, nnl);
TwoDNode temp_nearest = (TwoDNode)nnl.getHighest();
double temp_dist_sqd = nnl.getMaxPriority();
if (temp_dist_sqd < dist_sqd)
{
nearest = temp_nearest;
dist_sqd = temp_dist_sqd;
}
}
else if (pivot_to_target < max_dist_sqd)
{
nearest = kd;
dist_sqd = pivot_to_target;
}
}