rheostat/src/algorithms/log10.js

Rheostat is a www, mobile, and accessible slider component built with React

export default {
  getPosition(value, min, max) {
    const minv = Math.log(min);
    const maxv = Math.log(max);

    const scale = (maxv - minv) / 100;

    return (Math.log(value) - minv) / scale;
  },

  getValue(positionPercent, min, max) {
    const minv = Math.log(min);
    const maxv = Math.log(max);

    if (positionPercent === 0) {
      return min;
    }

    if (positionPercent === 100) {
      return max;
    }

    // calculate adjustment factor
    const scale = (maxv - minv) / 100;

    return Math.floor(Math.exp(minv + (scale * positionPercent))) || 0;
  },
};