d3-jsnext/src/color/hcl.js

d3, but futuristic

import { d3_radians } from '../math/trigonometry';
import { d3_lab, d3_lab_K, d3_lab_hcl } from './lab';
import { d3_color } from './color';
import { d3_rgb_lab, d3$rgb } from './rgb';

var d3_hcl;

d3$hcl = d3_hcl;

function d3_hcl(h, c, l) {
  return this instanceof d3_hcl ? void (this.h = +h, this.c = +c, this.l = +l)
      : arguments.length < 2 ? (h instanceof d3_hcl ? new d3_hcl(h.h, h.c, h.l)
      : (h instanceof d3_lab ? d3_lab_hcl(h.l, h.a, h.b)
      : d3_lab_hcl((h = d3_rgb_lab((h = d3$rgb(h)).r, h.g, h.b)).l, h.a, h.b)))
      : new d3_hcl(h, c, l);
}

var d3_hclPrototype = d3_hcl.prototype = new d3_color;

d3_hclPrototype.brighter = function(k) {
  return new d3_hcl(this.h, this.c, Math.min(100, this.l + d3_lab_K * (arguments.length ? k : 1)));
};

d3_hclPrototype.darker = function(k) {
  return new d3_hcl(this.h, this.c, Math.max(0, this.l - d3_lab_K * (arguments.length ? k : 1)));
};

d3_hclPrototype.rgb = function() {
  return d3_hcl_lab(this.h, this.c, this.l).rgb();
};

function d3_hcl_lab(h, c, l) {
  if (isNaN(h)) h = 0;
  if (isNaN(c)) c = 0;
  return new d3_lab(l, Math.cos(h *= d3_radians) * c, Math.sin(h) * c);
}

export { d3_hcl, d3_hcl_lab, d3_hclPrototype };