/**
* Create a root element
*
* Given rect of boundary must have topleft corner as origin
**/
public static QuadtreeNode createRootQuadtree(ConvexRect nodeBoundry){
QuadtreeNode rootQuadtree = new QuadtreeNode (null);
rootQuadtree.SetBoundary (nodeBoundry);
return rootQuadtree;
}
/**
* Find root quadtree
**/
public QuadtreeNode rootQuadtree(){
QuadtreeNode q = this;
while (q.parentNode != null)
q = q.parentNode;
#if DEBUG
if(q!=null)
q.debugDrawColor = Color.green;
#endif
return q;
}
/**
* Initilize quadtree node
**/
void InitNode(QuadtreeNode parent){
elements = new List<IQuadtreeAgent> (elementCapacity);
overlapElements = new List<IQuadtreeAgent> ();
elementsNextFrame = new List<IQuadtreeAgent> ();
parentNode = parent;
//set depth to 0 if this is root
if (parent == null)
depthIndex = 0;
else
depthIndex = parent.depthIndex + 1;
}
void Awake()
{
quadtreeSize = new Vector2(Camera.main.orthographicSize - 1.0f, Camera.main.orthographicSize - 1.0f);
boundary = new ConvexRect(new Vector2(transform.position.x, transform.position.y),
new Vector2(quadtreeSize.x, quadtreeSize.y)
);
QuadtreeNode.elementCapacity = capacity;
quadtree = QuadtreeNode.createRootQuadtree(boundary);
if (objToAdd > 0)
{
StartCoroutine(AutoAddObject());
}
}
/**
* Split quadtree node into 4
**/
private void Split(){
/*
#if DEBUG
Debug.Log("Split quadtree");
#endif
*/
#if DEBUG
if(nodes != null){
Debug.LogWarning("Child node already exist before split");
return;
}
#endif
ConvexRect newBoundary;
float width = boundary.Width / 2.0f;
float height = boundary.Height / 2.0f;
Vector2 topLeftCorner = boundary.AllCorners[0];
nodes = new QuadtreeNode[4];
//TopLeft(NorthWest)
newBoundary = new ConvexRect(topLeftCorner.x, topLeftCorner.y, width, height);
nodes[0] = new QuadtreeNode (this,newBoundary);
//TopRight(NorthEast)
newBoundary = new ConvexRect(topLeftCorner.x+width, topLeftCorner.y, width, height);
nodes[1] = new QuadtreeNode (this, newBoundary);
//BottomRight(SouthEast)
newBoundary = new ConvexRect(topLeftCorner.x+width, topLeftCorner.y - height, width, height);
nodes[2] = new QuadtreeNode (this, newBoundary);
//BottomLeft(SouthWest)
newBoundary = new ConvexRect(topLeftCorner.x, topLeftCorner.y - height, width, height);
nodes[3] = new QuadtreeNode (this, newBoundary);
}
public override void AddToQuadtreeNode(QuadtreeNode node)
{
base.AddToQuadtreeNode(node);
}
QuadtreeNode(QuadtreeNode parent, float x, float y , float width, float height){
InitNode (parent);
ConvexRect nodeBoundary = new ConvexRect (x, y, width, height);
SetBoundary (nodeBoundary);
}
QuadtreeNode(QuadtreeNode parent, ConvexRect nodeBoundary){
InitNode (parent);
SetBoundary (nodeBoundary);
}
/**
* Constructor
**/
QuadtreeNode(QuadtreeNode parent){
InitNode (parent);
}
public override void AddToQuadtreeNode(QuadtreeNode node)
{
//update node
currentNode = node;
}
public abstract void AddToQuadtreeNode(QuadtreeNode node);
/**
* Method to update agent in quadtree especially
* when agent moving around
**/
void UpdateAgentInQuadtree()
{
if (lastPosition != newPosition)
{
if (currentNode != null)
{
//check collision between agent and node boundary
CollisionResult result = this.GetShape().IntersectWithShape(currentNode.Boundary);
switch (result)
{
case CollisionResult.Fit:
if (!currentNode.IsLeaf) //has child node
//for all child nodes
{
IEnumerator er = currentNode.AllNodes.GetEnumerator();
while (er.MoveNext())
{
//if agent fit in this child
if (this.GetShape().IntersectWithShape((er.Current as QuadtreeNode).Boundary) == CollisionResult.Fit)
{
//move to child node
currentNode.Remove(this);
(er.Current as QuadtreeNode).Add(this);
}
}
}
break;
case CollisionResult.Overlap:
//find parent until agent complete fit in
QuadtreeNode pNode = currentNode.Parent;
while (pNode != null)
{
if (this.GetShape().IntersectWithShape(pNode.Boundary) == CollisionResult.Fit)
{
break;
}
pNode = pNode.Parent;
}
currentNode.Remove(this);
if (pNode == null) //root node
{
currentNode.rootQuadtree().Add(this);
}
else
{
pNode.Add(this);
}
break;
case CollisionResult.None:
currentNode.Remove(this);
currentNode.rootQuadtree().Add(this); //add from root quadtree
break;
}
}
lastPosition = newPosition;
}
}