d3.interpolateString(a, b) Returns an interpolator between the two strings a and b. The string interpolator finds numbers embedded in a and b, where each number is of the form understood by JavaScript. A few examples of numbers that will be detected within a string: -1, 42, 3.14159, and 6.0221413e+23. For each number embedded in b, the interpolator will attempt to find a corresponding number in a. If a corresponding number is found, a numeric interpolator is created using interpolateNumber. T

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

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.

d3.interpolateRgbBasisClosed(colors) Returns a uniform nonrational B-spline interpolator through the specified array of colors, which are converted to RGB color space. The control points are implicitly repeated such that the resulting spline has cyclical C² continuity when repeated around t in [0,1]; this is useful, for example, to create cyclical color scales. Opacity interpolation is not currently supported. See also d3.interpolateBasisClosed, and see d3-scale-chromatic for examples.

d3.interpolateRgbBasis(colors) Returns a uniform nonrational B-spline interpolator through the specified array of colors, which are converted to RGB color space. Implicit control points are generated such that the interpolator returns colors[0] at t = 0 and colors[colors.length - 1] at t = 1. Opacity interpolation is not currently supported. See also d3.interpolateBasis, and see d3-scale-chromatic for examples.

d3.interpolateRgb(a, b) Or, with a corrected gamma of 2.2: Returns an RGB color space interpolator between the two colors a and b with a configurable gamma. If the gamma is not specified, it defaults to 1.0. The colors a and b need not be in RGB; they will be converted to RGB using d3.rgb. The return value of the interpolator is an RGB string.

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

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

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

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