given a number and two ranges, fit from one range to another. This is basically http://stackoverflow.com/questions/929103/convert-a-number-range-to-another-range-maintaining-ratio for node.
npm install range-fit
Given a value, within range lowerInitial-upperInitial, return a value with the same ratio, between lowerNew-upperNew. If lowerInitial-upperInitial is 0, then we return lowerNew.
var rangeFit = require('range-fit');
var twenty = rangeFit(10, 0, 100, 0, 200);
see the tests for more.
Licensed under the MIT License