pack.size([size]) If size is specified, sets this pack layout’s size to the specified two-element array of numbers [width, height] and returns this pack layout. If size is not specified, returns the current size, which defaults to [1, 1].

pack.radius([radius]) If radius is specified, sets the pack layout’s radius accessor to the specified function and returns this pack layout. If radius is not specified, returns the current radius accessor, which defaults to null. If the radius accessor is null, the radius of each leaf circle is derived from the leaf node.value (computed by node.sum); the radii are then scaled proportionally to fit the layout size. If the radius accessor is not null, the radius of each leaf circle is specifie

pack.padding([padding]) If padding is specified, sets this pack layout’s padding accessor to the specified number or function or returns this pack layout. If padding is not specified, returns the current padding accessor, which defaults to the constant zero. When siblings are packed, tangent siblings will be separated by approximately the specified padding; the enclosing parent circle will also be separated from its children by approximately the specified padding. If an explicit radius is no

pack(root) Lays out the specified root hierarchy, assigning the following properties on root and its descendants: node.x - the x-coordinate of the circle’s center node.y - the y-coordinate of the circle’s center node.r - the radius of the circle You must call root.sum before passing the hierarchy to the pack layout. You probably also want to call root.sort to order the hierarchy before computing the layout.

ordinal.unknown([value]) If value is specified, sets the output value of the scale for unknown input values and returns this scale. If value is not specified, returns the current unknown value, which defaults to implicit. The implicit value enables implicit domain construction; see ordinal.domain.

ordinal.range([range]) If range is specified, sets the range of the ordinal scale to the specified array of values. The first element in the domain will be mapped to the first element in range, the second domain value to the second range value, and so on. If there are fewer elements in the range than in the domain, the scale will reuse values from the start of the range. If range is not specified, this method returns the current range.

ordinal.domain([domain]) If domain is specified, sets the domain to the specified array of values. The first element in domain will be mapped to the first element in the range, the second domain value to the second range value, and so on. Domain values are stored internally in a map from stringified value to index; the resulting index is then used to retrieve a value from the range. Thus, an ordinal scale’s values must be coercible to a string, and the stringified version of the domain value

ordinal.copy() Returns an exact copy of this ordinal scale. Changes to this scale will not affect the returned scale, and vice versa.

ordinal(value) Given a value in the input domain, returns the corresponding value in the output range. If the given value is not in the scale’s domain, returns the unknown; or, if the unknown value is implicit (the default), then the value is implicitly added to the domain and the next-available value in the range is assigned to value, such that this and subsequent invocations of the scale given the same input value return the same output value.

node.sum(value) Evaluates the specified value function for this node and each descendant in post-order traversal, and returns this node. The node.value property of each node is set to the numeric value returned by the specified function plus the combined value of all descendants. The function is passed the node’s data, and must return a non-negative number. The value accessor is evaluated for node and every descendant, including internal nodes; if you only want leaf nodes to have internal va