bytev-charts/lib/plugin/three.js/examples/js/math/ColorConverter.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

console.warn("THREE.ColorConverter: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation.");
THREE.ColorConverter = {
  setHSV: function setHSV(color, h, s, v) {
    // https://gist.github.com/xpansive/1337890#file-index-js
    h = THREE.MathUtils.euclideanModulo(h, 1);
    s = THREE.MathUtils.clamp(s, 0, 1);
    v = THREE.MathUtils.clamp(v, 0, 1);
    return color.setHSL(h, s * v / ((h = (2 - s) * v) < 1 ? h : 2 - h), h * 0.5);
  },
  getHSV: function () {
    var hsl = {};
    return function getHSV(color, target) {
      if (target === undefined) {
        console.warn('THREE.ColorConverter: .getHSV() target is now required');
        target = {
          h: 0,
          s: 0,
          l: 0
        };
      }

      color.getHSL(hsl); // based on https://gist.github.com/xpansive/1337890#file-index-js

      hsl.s *= hsl.l < 0.5 ? hsl.l : 1 - hsl.l;
      target.h = hsl.h;
      target.s = 2 * hsl.s / (hsl.l + hsl.s);
      target.v = hsl.l + hsl.s;
      return target;
    };
  }(),
  // where c, m, y, k is between 0 and 1
  setCMYK: function setCMYK(color, c, m, y, k) {
    var r = (1 - c) * (1 - k);
    var g = (1 - m) * (1 - k);
    var b = (1 - y) * (1 - k);
    return color.setRGB(r, g, b);
  },
  getCMYK: function getCMYK(color, target) {
    if (target === undefined) {
      console.warn('THREE.ColorConverter: .getCMYK() target is now required');
      target = {
        c: 0,
        m: 0,
        y: 0,
        k: 0
      };
    }

    var r = color.r;
    var g = color.g;
    var b = color.b;
    var k = 1 - Math.max(r, g, b);
    var c = (1 - r - k) / (1 - k);
    var m = (1 - g - k) / (1 - k);
    var y = (1 - b - k) / (1 - k);
    target.c = c;
    target.m = m;
    target.y = y;
    target.k = k;
    return target;
  }
};