tree(root) Lays out the specified root hierarchy, assigning the following properties on root and its descendants: node.x - the x-coordinate of the node node.y - the y-coordinate of the node The coordinates x and y represent an arbitrary coordinate system; for example, you can treat x as an angle and y as a radius to produce a radial layout. You may want to call root.sort before passing the hierarchy to the tree layout.

transition.tween(name[, value]) For each selected element, assigns the tween with the specified name with the specified value function. The value must be specified as a function that returns a function. When the transition starts, the value function 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 returned function is then invoked for each frame of the transition, in order, being passed the e

transition.transition() Returns a new transition on the same selected elements as this transition, scheduled to start when this transition ends. The new transition inherits a reference time equal to this transition’s time plus its delay and duration. The new transition also inherits this transition’s name, duration, and easing. This method can be used to schedule a sequence of chained transitions. For example: d3.selectAll(".apple") .transition() // First fade to green. .style("fill",

transition.text(value) For each selected element, sets the text content to the specified target value when the transition starts. The value may be specified either as a constant or a function. If a function, it is immediately 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 function’s return value is then used to set each element’s text content. A null value will clear the content. To interpolat

transition.styleTween(name[, factory[, priority]])) If factory is specified and not null, assigns the style tween for the style with the specified name to the specified interpolator factory. An interpolator factory is a function that returns an interpolator; when the transition starts, the factory 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 returned interpolator will then be invoked for

transition.styles(values[, priority]) Like selection.styles, but for transition.style.

transition.style(name, value[, priority]) For each selected element, assigns the style tween for the style with the specified name to the specified target value with the specified priority. The starting value of the tween is the style’s computed value when the transition starts. The target value may be specified either as a constant or a function. If a function, it is immediately evaluated for each selected element, in order, being passed the current datum d and index i, with the this contex

transition.size() Returns the total number of elements in this transition. Equivalent to selection.size.

transition.selection() Returns the selection corresponding to this transition.

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