quadtree.visitAfter(callback) Visits each node in the

quadtree.y([y]) If y is specified, sets the current y-coordinate accessor and returns the quadtree

quadtree.addAll(data) Adds the specified array of data to the quadtree, deriving each element’s coordinates

quadtree.copy() Returns a copy of the quadtree. All nodes in the

quadtree.x([x]) If x is specified, sets the current x-coordinate accessor and returns the quadtree

quadtree.removeAll(data) …

d3.quadtree([data[, x, y]]) Creates a new, empty quadtree with an empty

quadtree.visit(callback) Visits each node in the quadtree

quadtree.extent([extent]) If extent is specified, expands the quadtree to

quadtree.data() Returns an array of all data in the quadtree.