d3-mapping

Utility to make working with d3 scales less painful

A simple utility to make working with d3 scales easier.

Installation

npm install d3-Mapping

Usage

Designed to be used node style:

Mapping = require("d3-mapping")

Initialize a new mapping with a scale and an acessor function

= new Mapping(xScale, xAccessor)
 

x has convenience methods for a number of common tasks.

  • x.place(d) returns the value a data element is mapped to. x.place will dodge d3's reassignment of the this operator, so you are free to use within .attr assignments, etc.
  • x.create_domain(data) will call d3.extent(data, x.accessor). Currently doesn't support ordinal scales.
  • x.create_axis() creates an axis for the scale, and return it, so it can be used in a method chain.
  • axis and scale attributes can be set or accessed via x.axis and x.scale respectively.

Check out the example.