text: import Cartesian2 from "../Core/Cartesian2.js";
  import Color from "../Core/Color.js";
  import defaultValue from "../Core/defaultValue.js";
  import defined from "../Core/defined.js";
  import Event from "../Core/Event.js";
  import createPropertyDescriptor from "./createPropertyDescriptor.js";
  import Property from "./Property.js";
  
  var defaultEvenColor = Color.WHITE;
  var defaultOddColor = Color.BLACK;
  var defaultRepeat = new Cartesian2(2.0, 2.0);
  
  /**
   * A {@link MaterialProperty} that maps to checkerboard {@link Material} uniforms.
   * @alias CheckerboardMaterialProperty
   * @constructor
   *
   * @param {Object} [options] Object with the following properties:
   * @param {Property|Color} [options.evenColor=Color.WHITE] A Property specifying the first {@link Color}.
   * @param {Property|Color} [options.oddColor=Color.BLACK] A Property specifying the second {@link Color}.
   * @param {Property|Cartesian2} [options.repeat=new Cartesian2(2.0, 2.0)] A {@link Cartesian2} Property specifying how many times the tiles repeat in each direction.
   */
  function CheckerboardMaterialProperty(options) {
    options = defaultValue(options, defaultValue.EMPTY_OBJECT);
  
    this._definitionChanged = new Event();
    this._evenColor = undefined;
    this._evenColorSubscription = undefined;
    this._oddColor = undefined;
    this._oddColorSubscription = undefined;
    this._repeat = undefined;
    this._repeatSubscription = undefined;
  
    this.evenColor = options.evenColor;
    this.oddColor = options.oddColor;
    this.repeat = options.repeat;
  }
  
  Object.defineProperties(CheckerboardMaterialProperty.prototype, {
    /**
     * Gets a value indicating if this property is constant.  A property is considered
     * constant if getValue always returns the same result for the current definition.
     * @memberof CheckerboardMaterialProperty.prototype
     *
     * @type {Boolean}
     * @readonly
     */
    isConstant: {
      get: function () {
        return (
          Property.isConstant(this._evenColor) && //
          Property.isConstant(this._oddColor) && //
          Property.isConstant(this._repeat)
        );
      },
    },
  
    /**
     * Gets the event that is raised whenever the definition of this property changes.
     * The definition is considered to have changed if a call to getValue would return
     * a different result for the same time.
     * @memberof CheckerboardMaterialProperty.prototype
     *
     * @type {Event}
     * @readonly
     */
    definitionChanged: {
      get: function () {
        return this._definitionChanged;
      },
    },
  
    /**
     * Gets or sets the Property specifying the first {@link Color}.
     * @memberof CheckerboardMaterialProperty.prototype
     * @type {Property|undefined}
     * @default Color.WHITE
     */
    evenColor: createPropertyDescriptor("evenColor"),
  
    /**
     * Gets or sets the Property specifying the second {@link Color}.
     * @memberof CheckerboardMaterialProperty.prototype
     * @type {Property|undefined}
     * @default Color.BLACK
     */
    oddColor: createPropertyDescriptor("oddColor"),
  
    /**
     * Gets or sets the {@link Cartesian2} Property specifying how many times the tiles repeat in each direction.
     * @memberof CheckerboardMaterialProperty.prototype
     * @type {Property|undefined}
     * @default new Cartesian2(2.0, 2.0)
     */
    repeat: createPropertyDescriptor("repeat"),
  });
  
  /**
   * Gets the {@link Material} type at the provided time.
   *
   * @param {JulianDate} time The time for which to retrieve the type.
   * @returns {String} The type of material.
   */
  CheckerboardMaterialProperty.prototype.getType = function (time) {
    return "Checkerboard";
  };
  
  /**
   * Gets the value of the property at the provided time.
   *
   * @param {JulianDate} time The time for which to retrieve the value.
   * @param {Object} [result] The object to store the value into, if omitted, a new instance is created and returned.
   * @returns {Object} The modified result parameter or a new instance if the result parameter was not supplied.
   */
  CheckerboardMaterialProperty.prototype.getValue = function (time, result) {
    if (!defined(result)) {
      result = {};
    }
    result.lightColor = Property.getValueOrClonedDefault(
      this._evenColor,
      time,
      defaultEvenColor,
      result.lightColor
    );
    result.darkColor = Property.getValueOrClonedDefault(
      this._oddColor,
      time,
      defaultOddColor,
      result.darkColor
    );
    result.repeat = Property.getValueOrDefault(this._repeat, time, defaultRepeat);
    return result;
  };
  
  /**
   * Compares this property to the provided property and returns
   * <code>true</code> if they are equal, <code>false</code> otherwise.
   *
   * @param {Property} [other] The other property.
   * @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
   */
  CheckerboardMaterialProperty.prototype.equals = function (other) {
    return (
      this === other || //
      (other instanceof CheckerboardMaterialProperty && //
        Property.equals(this._evenColor, other._evenColor) && //
        Property.equals(this._oddColor, other._oddColor) && //
        Property.equals(this._repeat, other._repeat))
    );
  };
  export default CheckerboardMaterialProperty;
  