d3.interpolateCool(t) Given a number t in the range [0,1], returns the corresponding color from Niccoli’s perceptual rainbow, represented as an RGB string.

d3.interpolateBlues(t) d3.schemeBlues Given a number t in the range [0,1], returns the corresponding color from the “Blues” sequential color scheme represented as an RGB string.

d3.interpolateBrBG(t) d3.schemeBrBG Given a number t in the range [0,1], returns the corresponding color from the “BrBG” diverging color scheme represented as an RGB string.

d3.interpolateBuGn(t) d3.schemeBuGn Given a number t in the range [0,1], returns the corresponding color from the “BuGn” sequential color scheme represented as an RGB string.

d3.interpolateBasisClosed(values) Returns a uniform nonrational B-spline interpolator through the specified array of values, which must be numbers. The control points are implicitly repeated such that the resulting one-dimensional spline has cyclical C² continuity when repeated around t in [0,1]. See also d3.curveBasisClosed.

d3.interpolateArray(a, b) Returns an interpolator between the two arrays a and b. Internally, an array template is created that is the same length in b. For each element in b, if there exists a corresponding element in a, a generic interpolator is created for the two elements using interpolate. If there is no such element, the static value from b is used in the template. Then, for the given parameter t, the template’s embedded interpolators are evaluated. The updated array template is then re

d3.interpolateBasis(values) Returns a uniform nonrational B-spline interpolator through the specified array of values, which must be numbers. Implicit control points are generated such that the interpolator returns values[0] at t = 0 and values[values.length - 1] at t = 1. See also d3.curveBasis.

d3.interpolate(a, b) Returns an interpolator between the two arbitrary values a and b. The interpolator implementation is based on the type of the end value b, using the following algorithm: If b is null, undefined or a boolean, use the constant b. If b is a number, use interpolateNumber. If b is a color or a string coercible to a color, use interpolateRgb. If b is a date, use interpolateDate. If b is a string, use interpolateString. If b is an array, use interpolateArray. If b is coercible to

d3.hierarchy(data[, children]) Constructs a root node from the specified hierarchical data. The specified data must be an object representing the root node. For example: { "name": "Eve", "children": [ { "name": "Cain" }, { "name": "Seth", "children": [ { "name": "Enos" }, { "name": "Noam" } ] }, { "name": "Abel" }, { "name": "Awan", "children": [ { "n

d3.hsl(h, s, l[, opacity]) d3.hsl(specifier) d3.hsl(color) Constructs a new HSL color. The channel values are exposed as h, s and l properties on the returned instance. Use the HSL color picker to explore this color space. If h, s and l are specified, these represent the channel values of the returned color; an opacity may also be specified. If a CSS Color Module Level 3 specifier string is specified, it is parsed and then converted to the HSL color space. See color for examples. If a color