Function d3_scale_pow

explainshell/web/static/js/d3.v3.js:6570–6603

(linear, exponent)

    return d3_scale_pow(d3.scale.linear(), 1);
  };
  function d3_scale_pow(linear, exponent) {
    var powp = d3_scale_powPow(exponent), powb = d3_scale_powPow(1 / exponent);
    function scale(x) {
      return linear(powp(x));
    }
    scale.invert = function(x) {
      return powb(linear.invert(x));
    };
    scale.domain = function(x) {
      if (!arguments.length) return linear.domain().map(powb);
      linear.domain(x.map(powp));
      return scale;
    };
    scale.ticks = function(m) {
      return d3_scale_linearTicks(scale.domain(), m);
    };
    scale.tickFormat = function(m, format) {
      return d3_scale_linearTickFormat(scale.domain(), m, format);
    };
    scale.nice = function() {
      return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
    };
    scale.exponent = function(x) {
      if (!arguments.length) return exponent;
      var domain = scale.domain();
      powp = d3_scale_powPow(exponent = x);
      powb = d3_scale_powPow(1 / exponent);
      return scale.domain(domain);
    };
    scale.copy = function() {
      return d3_scale_pow(linear.copy(), exponent);
    };
    return d3_scale_linearRebind(scale, linear);
  }
  function d3_scale_powPow(e) {
    return function(x) {
      return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);