Ordinal Scales

API Reference ▸ Scales ▸ Ordinal Scales

Scales are functions that map from an input domain to an output range. Ordinal scales have a discrete domain, such as a set of names or categories. There are also quantitative scales, which have a continuous domain, such as the set of real numbers. Scales are an optional feature in D3; you don't have to use them, if you prefer to do the math yourself. However, using scales can greatly simplify the code needed to map a dimension of data to a visual representation.

A scale object, such as that returned by d3.scale.ordinal, is both an object and a function. That is: you can call the scale like any other function, and the scale has additional met

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