A packaged version of aubergene's Scale (https://gist.github.com/aubergene/7791133)

README.md

I love D3's Quantitative Scales and wanted a simple way to create and use scales in that style.

Example

var centigradeToFahrenheit = new Sideburns(-40, 0, -40, 32);

centigradeToFahrenheit(35); // 95 hot!
centigradeToFahrenheit.inverse(14); // -10 cold!

sideburns.js

var Sideburns = function(minDomain, maxDomain, minRange, maxRange, clamp){

  // This is a function
  var Normalizer = function(min, max) {
    return function(val) {
      return (val - min) / (max - min);
    }
  }

  // This is another
  var Interpolater = function(min, max, clamp) {
    return function(val) {
      val = min + (max - min) * val;
      return clamp ? Math.min(Math.max(val, min), max) : val;
    }
  }

  // This is a third
  var Scale = function(minDomain, maxDomain, minRange, maxRange, clamp) {
    var normalize = new Normalizer(minDomain, maxDomain);
    var interpolate = new Interpolater(minRange, maxRange, clamp);
    var _normalize = new Normalizer(minRange, maxRange);
    var _interpolate = new Interpolater(minDomain, maxDomain, clamp);
    var s = function(val) {
      return interpolate(normalize(val));
    };
    s.inverse = function(val) {
      return _interpolate(_normalize(val));
    };
    return s;
  }

  return Scale(minDomain, maxDomain, minRange, maxRange, clamp);

};

thumbnail.png