public void DrawTree(Graphics g, Pen pen, SolidBrush brush, KDTreeNode <E> node, int xPos, int yPos, int xPad, int depth)
{
double maxNumPerDepth = Math.Pow(2, depth);
if (node == null)
{
return;
}
if (node.Left != null && node.Left.Value != null)
{
DrawTree(g, pen, brush, node.Left, (xPos - xPad), yPos + 100, xPad - 15, depth + 1);
if (node.Value != null)
{
g.DrawLine(pen, new Point(xPos + 5, yPos + 5), new Point((xPos - xPad) + 5, (yPos + 100) + 5));
}
}
if (node.Value != null)
{
g.DrawString(node.ToString(), new Font(FontFamily.GenericSansSerif, 7), brush, xPos, yPos - 20);
g.FillEllipse(brush, xPos, yPos, 10, 10);
}
if (node.Right != null && node.Right.Value != null)
{
DrawTree(g, pen, brush, node.Right, (xPos + xPad), yPos + 100, xPad - 15, depth + 1);
g.DrawLine(pen, new Point(xPos + 5, yPos + 5), new Point((xPos + xPad) + 5, (yPos + 100) + 5));
}
}
public KDTreeNode <E> FindMinimum(KDTreeNode <E> t, int axisToSearch, int cuttingDimension)
{
int cd = (cuttingDimension + 1) % Dimension;
if (axisToSearch == cuttingDimension)
{
if (t.Left == null)
{
return(t);
}
else
{
return(FindMinimum(t.Left, axisToSearch, cd));
}
}
else
{
if (t.Left != null && t.Right != null)
{
return(FindMinimum(t.Right, axisToSearch, cd).Value[axisToSearch].CompareTo(FindMinimum(t.Left, axisToSearch, cd).Value[axisToSearch]) > 0 ? FindMinimum(t.Left, axisToSearch, cd) : FindMinimum(t.Right, axisToSearch, cd));
}
else if (t.Left != null && t.Right == null)
{
return(FindMinimum(t, axisToSearch, cd).Value[axisToSearch].CompareTo(FindMinimum(t.Left, axisToSearch, cd).Value[axisToSearch]) > 0 ? FindMinimum(t, axisToSearch, cd) : FindMinimum(t.Left, axisToSearch, cd));
}
else if (t.Left == null && t.Right != null)
{
return(FindMinimum(t, axisToSearch, cd).Value[axisToSearch].CompareTo(FindMinimum(t.Right, axisToSearch, cd).Value[axisToSearch]) < 0 ? FindMinimum(t, axisToSearch, cd) : FindMinimum(t.Right, axisToSearch, cd));
}
else
{
return(t);
}
}
}
public KDTreeNode(T[] data, KDTreeNode <T> left = null, KDTreeNode <T> right = null)
{
Value = data;
Dimension = Value.Length;
Children = new NodeList <T>(2);
if (left != null)
{
Children[0] = left;
}
if (right != null)
{
Children[1] = right;
}
}
public KDTreeNode <E> DeleteNode(KDTreeNode <E> t, E[] point, int cuttingDimension)
{
if (t == null)
{
return(null);
}
int cd = (cuttingDimension + 1) % Dimension;
if (ArrayEquals(point, t.Value))
{
List <E[]> nodes = GetChildren(t);
nodes.RemoveAt(0);
if (t.Parent != null)
{
if (t == t.Parent.Left)
{
t.Parent.Left = null;
}
else if (t == t.Parent.Right)
{
t.Parent.Right = null;
}
}
foreach (var x in nodes)
{
AddNode(x);
}
t = null;
}
else if (point[cuttingDimension].CompareTo(t.Value[cuttingDimension]) < 0)
{
t.Left = DeleteNode(t.Left, t.Value, cd);
}
else if (point[cuttingDimension].CompareTo(t.Value[cuttingDimension]) > 0)
{
t.Right = DeleteNode(t.Right, t.Value, cd);
}
return(t);
}
public int GetDepth(E[] dataToFind)
{
int depth = -1;
KDTreeNode <E> Current = Root;
if (dataToFind.Length != Dimension)
{
return(-1);
}
while (Current != null)
{
if (depth == Dimension - 1)
{
depth = 0;
}
else
{
++depth;
}
if (ArrayEquals(Current.Value, dataToFind))
{
return(depth);
}
else if (Current.Value[depth].CompareTo(dataToFind[depth]) > 0)
{
Current = Current.Left;
}
else if (Current.Value[depth].CompareTo(dataToFind[depth]) < 0)
{
Current = Current.Right;
}
}
return(-1);
}
public void PostOrderTraversal(KDTreeNode <E> node)
{
if (node == null)
{
return;
}
if (node.Left != null)
{
PostOrderTraversal(node.Left);
}
if (node.Right != null)
{
PostOrderTraversal(node.Right);
}
if (node.Value != null)
{
Console.Write("\n" + string.Format("Value : {0:00}, Parent : {1}, Left Child : {2}, Right Child : {3}",
node.ToString(),
node.Parent != null ? node.Parent.ToString() : "No Parent",
node.Left != null ? node.Left.ToString() : "No Left Child",
node.Right != null ? node.Right.ToString() : "No Right Child")
);
}
}
public List <E[]> GetChildren(KDTreeNode <E> node, List <E[]> list = null)
{
if (list == null)
{
list = new List <E[]>();
}
if (node == null)
{
return(list);
}
if (node.Value != null)
{
list.Add(node.Value);
}
if (node.Left != null)
{
GetChildren(node.Left, list);
}
if (node.Right != null)
{
GetChildren(node.Right, list);
}
return(list);
}
public bool AddNode(E[] dataToAdd)
{
KDTreeNode <E> tempNode = new KDTreeNode <E>(dataToAdd);
KDTreeNode <E> Current = Root, parent = null;
int depth = -1;
if (dataToAdd.Length != Dimension)
{
return(false);
}
while (Current != null)
{
if (depth == Dimension - 1)
{
depth = 0;
}
else
{
++depth;
}
if (Current.Value[depth].CompareTo(dataToAdd[depth]) == 0)
{
return(false);
}
else if (Current.Value[depth].CompareTo(dataToAdd[depth]) > 0)
{
parent = Current;
Current = Current.Left;
}
else if (Current.Value[depth].CompareTo(dataToAdd[depth]) < 0)
{
parent = Current;
Current = Current.Right;
}
}
if (parent == null)
{
Root = tempNode;
Root.Parent = null;
}
else
{
if (parent.Value[depth].CompareTo(dataToAdd[depth]) > 0)
{
parent.Left = tempNode;
parent.Left.Parent = parent;
}
else if (parent.Value[depth].CompareTo(dataToAdd[depth]) < 0)
{
parent.Right = tempNode;
parent.Right.Parent = parent;
}
depth = 0;
return(true);
}
return(false);
}
private void Nullify(KDTreeNode <E> node)
{
node = null;
}