d3.hsl = function(h, s, l) {

  return arguments.length === 1

      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)

      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))

      : d3_hsl(+h, +s, +l);

};

function d3_hsl(h, s, l) {

  return new d3_Hsl(h, s, l);

}

function d3_Hsl(h, s, l) {

  this.h = h;

  this.s = s;

  this.l = l;

}

d3_Hsl.prototype.brighter = function(k) {

  k = Math.pow(0.7, arguments.length ? k : 1);

  return d3_hsl(this.h, this.s, this.l / k);

};

d3_Hsl.prototype.darker = function(k) {

  k = Math.pow(0.7, arguments.length ? k : 1);

  return d3_hsl(this.h, this.s, k * this.l);

};

d3_Hsl.prototype.rgb = function() {

  return d3_hsl_rgb(this.h, this.s, this.l);

};

d3_Hsl.prototype.toString = function() {

  return this.rgb().toString();

};

function d3_hsl_rgb(h, s, l) {

  var m1,

      m2;

  /* Some simple corrections for h, s and l. */

  h = h % 360; if (h < 0) h += 360;

  s = s < 0 ? 0 : s > 1 ? 1 : s;

  l = l < 0 ? 0 : l > 1 ? 1 : l;

  /* From FvD 13.37, CSS Color Module Level 3 */

  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;

  m1 = 2 * l - m2;

  function v(h) {

    if (h > 360) h -= 360;

    else if (h < 0) h += 360;

    if (h < 60) return m1 + (m2 - m1) * h / 60;

    if (h < 180) return m2;

    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;

    return m1;

  }

  function vv(h) {

    return Math.round(v(h) * 255);

  }

  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));

}