color.displayable() Returns true if and only if the color is displayable on standard hardware. For example, this returns false for an RGB color if any channel value is less than zero or greater than 255, or if the opacity is not in the range [0, 1].

d3.curveCatmullRomOpen(context) Produces a cubic Catmull–Rom spline using the specified control points and the parameter alpha, which defaults to 0.5, as proposed by Yuksel et al. Unlike curveCatmullRom, one-sided differences are not used for the first and last piece, and thus the curve starts at the second point and ends at the penultimate point.

d3.tsvParse(string[, row]) Equivalent to dsvFormat("\t").parse.

timer.restart(callback[, delay[, time]]) Restart a timer with the specified callback and optional delay and time. This is equivalent to stopping this timer and creating a new timer with the specified arguments, although this timer retains the original invocation priority.

d3.voronoi() Creates a new Voronoi layout with default x- and y- accessors and a null extent.

threshold.domain([domain]) If domain is specified, sets the scale’s domain to the specified array of values. The values must be in sorted ascending order, or the behavior of the scale is undefined. The values are typically numbers, but any naturally ordered values (such as strings) will work; a threshold scale can be used to encode any type that is ordered. If the number of values in the scale’s range is N+1, the number of values in the scale’s domain must be N. If there are fewer than N ele

link.distance([distance]) If distance is specified, sets the distance accessor to the specified number or function, re-evaluates the distance accessor for each link, and returns this force. If distance is not specified, returns the current distance accessor, which defaults to: function distance() { return 30; } The distance accessor is invoked for each link, being passed the link and its zero-based index. The resulting number is then stored internally, such that the distance of each link i

line.y([y]) If y is specified, sets the y accessor to the specified function or number and returns this line generator. If y is not specified, returns the current y accessor, which defaults to: function y(d) { return d[1]; } When a line is generated, the y accessor will be invoked for each defined element in the input data array, being passed the element d, the index i, and the array data as three arguments. The default y accessor assumes that the input data are two-element arrays of numbe

ribbon.startAngle([angle]) If angle is specified, sets the start angle accessor to the specified function and returns this ribbon generator. If angle is not specified, returns the current start angle accessor, which defaults to: function startAngle(d) { return d.startAngle; } The angle is specified in radians, with 0 at -y (12 o’clock) and positive angles proceeding clockwise.

d3.interpolateRound(a, b) Returns an interpolator between the two numbers a and b; the interpolator is similar to interpolateNumber, except it will round the resulting value to the nearest integer.