public void InsertNode(int value)
{
RedBlackNode newNode = new RedBlackNode();
newNode.key = value;
newNode.SetColor("red");
RedBlackNode current = root;
RedBlackNode parent = current;
bool done = false;
if (!rootSet)
{
root.key = value;
root.SetColor("black");
rootSet = true;
}
else
{
while (!done)
{
parent = current;
if (value < current.key)
{
current = current.leftChild;
if (current == null)
{
parent.leftChild = newNode;
newNode.parent = parent;
done = true;
Rebalance(newNode);
}
}
else if (value > current.key)
{
current = current.rightChild;
if (current == null)
{
parent.rightChild = newNode;
newNode.parent = parent;
done = true;
Rebalance(newNode);
}
}
}
}
}
private void RightRotation(RedBlackNode node)
{
RedBlackNode newParent = node.leftChild; // new parent = grandparent's left child
newParent.leftChild.parent = newParent; // problem child's parent = new parent
newParent.parent = node.parent; // new parents parent = grandparent's parent
newParent.rightChild = node; // new parent's left child = grandparent
newParent.rightChild.parent = newParent;
newParent.rightChild.leftChild = null;
if (newParent.parent != null)
{
if (newParent.parent.key < newParent.key)
{
newParent.parent.rightChild = newParent;
}
else if (newParent.parent.key > newParent.key)
{
newParent.parent.leftChild = newParent;
}
}
else if (newParent.parent == null)
{
newParent.parent = null;
root = newParent;
}
newParent.SetColor("Black");
node.SetColor("Red");
}