//Private Methods
private void createChildren()
{
HasChildren = true;
//Divide the Node's bounding box into 4 quadrants
int sizeX = _boundingBox.Width / 2;
int sizeY = _boundingBox.Height / 2;
AABB2D nwRect = new AABB2D(_boundingBox.X, _boundingBox.Y, sizeX, sizeY);
AABB2D neRect = new AABB2D(_boundingBox.CenterX, _boundingBox.Y, sizeX, sizeY);
AABB2D swRect = new AABB2D(_boundingBox.X, _boundingBox.CenterY, sizeX, sizeY);
AABB2D seRect = new AABB2D(_boundingBox.CenterX, _boundingBox.CenterY, sizeX, sizeY);
_children[0] = new QuadNode <T>(nwRect, this);
_children[1] = new QuadNode <T>(neRect, this);
_children[2] = new QuadNode <T>(swRect, this);
_children[3] = new QuadNode <T>(seRect, this);
}