Function d3_ease_poly

explainshell/web/static/js/d3.v3.js:4925–4929

(e)

    return 4 * (t < .5 ? t3 : 3 * (t - t2) + t3 - .75);
  }
  function d3_ease_poly(e) {
    return function(t) {
      return Math.pow(t, e);
    };
  }
  function d3_ease_sin(t) {
    return 1 - Math.cos(t * π / 2);
  }