@visx/vendor/vendor-cjs/d3-color/src/cubehelix.js

vendored packages for visx

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Cubehelix = Cubehelix;
exports.default = cubehelix;
var _define = _interopRequireWildcard(require("./define.js"));
var _color = require("./color.js");
var _math = require("./math.js");
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
var A = -0.14861,
  B = +1.78277,
  C = -0.29227,
  D = -0.90649,
  E = +1.97294,
  ED = E * D,
  EB = E * B,
  BC_DA = B * C - D * A;
function cubehelixConvert(o) {
  if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
  if (!(o instanceof _color.Rgb)) o = (0, _color.rgbConvert)(o);
  var r = o.r / 255,
    g = o.g / 255,
    b = o.b / 255,
    l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
    bl = b - l,
    k = (E * (g - l) - C * bl) / D,
    s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)),
    // NaN if l=0 or l=1
    h = s ? Math.atan2(k, bl) * _math.degrees - 120 : NaN;
  return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
}
function cubehelix(h, s, l, opacity) {
  return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
}
function Cubehelix(h, s, l, opacity) {
  this.h = +h;
  this.s = +s;
  this.l = +l;
  this.opacity = +opacity;
}
(0, _define.default)(Cubehelix, cubehelix, (0, _define.extend)(_color.Color, {
  brighter(k) {
    k = k == null ? _color.brighter : Math.pow(_color.brighter, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  darker(k) {
    k = k == null ? _color.darker : Math.pow(_color.darker, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  rgb() {
    var h = isNaN(this.h) ? 0 : (this.h + 120) * _math.radians,
      l = +this.l,
      a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
      cosh = Math.cos(h),
      sinh = Math.sin(h);
    return new _color.Rgb(255 * (l + a * (A * cosh + B * sinh)), 255 * (l + a * (C * cosh + D * sinh)), 255 * (l + a * (E * cosh)), this.opacity);
  }
}));