center.y([y]) If y is specified, sets the y-coordinate of the centering position to the specified number and returns this force. If y is not specified, returns the current y-coordinate, which defaults to zero.

selection.insert(type, before) If the specified type is a string, inserts a new element of this type (tag name) before the element matching the specified before selector for each selected element. For example, a before selector :first-child will prepend nodes before the first child. Both type and before may instead be specified as functions which are evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with t

queue.awaitAll(callback) Sets the callback to be invoked when all deferred tasks have finished. The first argument to the callback is the first error that occurred, or null if no error occurred. If an error occurred, there are no additional arguments to the callback. Otherwise, the callback is also passed an array of results as the second argument. For example: d3.queue() .defer(fs.stat, __dirname + "/../Makefile") .defer(fs.stat, __dirname + "/../package.json") .awaitAll(functio

selection.properties(values) A convenience method on top of selection.property for setting multiple element properties. If the specified values is an object, the values may be specified either as strings or functions. For example: selection.properties({foo: "foo-value", id: function(d, i) { return "id-" + i; }}); If a value is a constant, all elements are given the same property value; otherwise, if a value is a function, the function is evaluated for each selected element, in order, being pas

quantize.invertExtent(value) Returns the extent of values in the domain [x0, x1] for the corresponding value in the range: the inverse of quantize. This method is useful for interaction, say to determine the value in the domain that corresponds to the pixel location under the mouse. var width = d3.scaleQuantize() .domain([10, 100]) .range([1, 2, 4]); width.invertExtent(2); // [40, 70]

transition.selectAll(selector) For each selected element, selects all descendant elements that match the specified selector string, if any, and returns a transition on the resulting selection. The selector may be specified either as a selector string or a function. If a function, it is evaluated for each selected element, in order, being passed the current datum d and index i, with the this context as the current DOM element. The new transition has the same id, name and timing as this transi

d3.transition([name]) Returns a new transition on the root element, document.documentElement, with the specified name. If a name is not specified, null is used. The new transition is only exclusive with other transitions of the same name. The name may also be a transition instance; see selection.transition. This method is equivalent to: d3.selection() .transition(name) This function can also be used to test for transitions (instanceof d3.transition) or to extend the transition prototype.

quadtree.visit(callback) Visits each node in the quadtree in pre-order traversal, invoking the specified callback with arguments node, x0, y0, x1, y1 for each node, where node is the node being visited, ⟨x0, y0⟩ are the lower bounds of the node, and ⟨x1, y1⟩ are the upper bounds, and returns the quadtree. (Assuming that positive x is right and positive y is down, as is typically the case in Canvas and SVG, ⟨x0, y0⟩ is the top-left corner and ⟨x1, y1⟩ is the lower-right corner; however, the c

simulation.stop() Stops the simulation’s internal timer, if it is running, and returns the simulation. If the timer is already stopped, this method does nothing. This method is useful for running the simulation manually; see simulation.tick.

pie.value([value]) If value is specified, sets the value accessor to the specified function or number and returns this pie generator. If value is not specified, returns the current value accessor, which defaults to: function value(d) { return d; } When a pie is generated, the value accessor will be invoked for each element in the input data array, being passed the element d, the index i, and the array data as three arguments. The default value accessor assumes that the input data are numbe