public void AddItem(BSTVisualItem item)
{
_items.Add(item);
}
private GameObject Delete(GameObject node, int key)
{
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.Node));
if (node == null)
{
return(node);
}
// key to be deleted smaller than root key --> it's in the left subtree
if (key < node.GetComponent <NodeScript>().Key)
{
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.LeftArrow));
node.GetComponent <NodeScript>().IsLocked = true;
node.GetComponent <NodeScript>().LeftNode = Delete(node.GetComponent <NodeScript>().LeftNode, key);
}
// key greater --> right subtree
else if (key > node.GetComponent <NodeScript>().Key)
{
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.RightArrow));
node.GetComponent <NodeScript>().IsLocked = true;
node.GetComponent <NodeScript>().RightNode = Delete(node.GetComponent <NodeScript>().RightNode, key);
}
// key equal --> this node gets deleted
else
{
// one child or no child
if (node.GetComponent <NodeScript>().LeftNode == null)
{
GameObject temp = node.GetComponent <NodeScript>().RightNode;
BSTVisualItem item = new BSTVisualItem(node, (int)VisualType.DestroyNode, enteredKey: key, parentNode: node.GetComponent <NodeScript>().ParentNode);
bstVisual.Items.Add(item);
if (temp != null)
{
item.TempNode = temp;
}
return(temp);
}
else if (node.GetComponent <NodeScript>().RightNode == null)
{
GameObject temp = node.GetComponent <NodeScript>().LeftNode;
BSTVisualItem item = new BSTVisualItem(node, (int)VisualType.DestroyNode, enteredKey: key, parentNode: node.GetComponent <NodeScript>().ParentNode);
bstVisual.Items.Add(item);
if (temp != null)
{
item.TempNode = temp;
}
return(temp);
}
// node has two children --> find inorder successor, set node to inorder successor value, delete inorder successor
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.InorderSuccessor));
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.RightArrow));
GameObject inorderSuccessor = InorderSuccessor(node.GetComponent <NodeScript>().RightNode);
if (inorderSuccessor != null)
{
bstVisual.Items.Add(new BSTVisualItem(inorderSuccessor, (int)VisualType.InorderSuccessorFound));
int inorderSuccessorKey = inorderSuccessor.GetComponent <NodeScript>().Key;
Vector3 dest = node.transform.localPosition;
//dest.y -= node.transform.localScale.y / 2;
bstVisual.Items.Add(new BSTVisualItem(inorderSuccessor, (int)VisualType.InorderSuccessorMove, inorderPosition: inorderSuccessor.transform.localPosition,
dest: dest, enteredKey: key, parentNode: inorderSuccessor.GetComponent <NodeScript>().ParentNode, inorderKey: inorderSuccessorKey));
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.SetNodeKey, enteredKey: key, inorderKey: inorderSuccessorKey));
bstVisual.Items.Add(new BSTVisualItem(node, (int)VisualType.RightArrow));
node.GetComponent <NodeScript>().RightNode = Delete(node.GetComponent <NodeScript>().RightNode, inorderSuccessor.GetComponent <NodeScript>().Key);
}
}
return(node);
}
