color-math/es/ColorScale.js

expressions to manipulate colors

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var Chroma = require('chroma-js');

var ColorScale =
/*#__PURE__*/
function () {
  function ColorScale(name, params, scaleParams) {
    _classCallCheck(this, ColorScale);

    this.name = name.toLowerCase();
    this.params = params || [];
    this.scaleParams = scaleParams || [];
  }

  _createClass(ColorScale, [{
    key: "toString",
    value: function toString() {
      return "<colorScale.".concat(this.name, ">");
    }
  }, {
    key: "clone",
    value: function clone() {
      var obj = new ColorScale(this.name, this.params.slice(0), this.scaleParams.slice(0));
      return obj;
    }
  }, {
    key: "_getParamValue",
    value: function _getParamValue(params, name) {
      for (var i = 0; i < params.length; i++) {
        if (params[i].name === name) {
          return params[i].value;
        }
      }
    }
  }, {
    key: "_applyParams",
    value: function _applyParams(fn, params) {
      for (var i = 0; i < params.length; i++) {
        if (params[i].name !== 'colors') {
          fn = fn[params[i].name](params[i].value);
        }
      }
    }
  }, {
    key: "getFn",
    value: function getFn() {
      var colors = this._getParamValue(this.scaleParams, 'colors');

      var ctor = Chroma[this.name];
      var fn = colors ? ctor(colors) : ctor();

      this._applyParams(fn, this.params);

      if (this.name !== 'scale') {
        fn = fn.scale();
      }

      this._applyParams(fn, this.scaleParams);

      return fn;
    }
  }]);

  return ColorScale;
}();

export { ColorScale as default };