jtBaseApp/node_modules/@cesium/engine/Source/DataSources/PathGraphics.js

import defaultValue from "../Core/defaultValue.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import Event from "../Core/Event.js";
import createMaterialPropertyDescriptor from "./createMaterialPropertyDescriptor.js";
import createPropertyDescriptor from "./createPropertyDescriptor.js";

/**
 * @typedef {object} PathGraphics.ConstructorOptions
 *
 * Initialization options for the PathGraphics constructor
 *
 * @property {Property | boolean} [show=true] A boolean Property specifying the visibility of the path.
 * @property {Property | number} [leadTime] A Property specifying the number of seconds in front the object to show.
 * @property {Property | number} [trailTime] A Property specifying the number of seconds behind of the object to show.
 * @property {Property | number} [width=1.0] A numeric Property specifying the width in pixels.
 * @property {Property | number} [resolution=60] A numeric Property specifying the maximum number of seconds to step when sampling the position.
 * @property {MaterialProperty | Color} [material=Color.WHITE] A Property specifying the material used to draw the path.
 * @property {Property | DistanceDisplayCondition} [distanceDisplayCondition] A Property specifying at what distance from the camera that this path will be displayed.
 */

/**
 * Describes a polyline defined as the path made by an {@link Entity} as it moves over time.
 *
 * @alias PathGraphics
 * @constructor
 *
 * @param {PathGraphics.ConstructorOptions} [options] Object describing initialization options
 */
function PathGraphics(options) {
  this._definitionChanged = new Event();
  this._show = undefined;
  this._showSubscription = undefined;
  this._leadTime = undefined;
  this._leadTimeSubscription = undefined;
  this._trailTime = undefined;
  this._trailTimeSubscription = undefined;
  this._width = undefined;
  this._widthSubscription = undefined;
  this._resolution = undefined;
  this._resolutionSubscription = undefined;
  this._material = undefined;
  this._materialSubscription = undefined;
  this._distanceDisplayCondition = undefined;
  this._distanceDisplayConditionSubscription = undefined;

  this.merge(defaultValue(options, defaultValue.EMPTY_OBJECT));
}

Object.defineProperties(PathGraphics.prototype, {
  /**
   * Gets the event that is raised whenever a property or sub-property is changed or modified.
   * @memberof PathGraphics.prototype
   * @type {Event}
   * @readonly
   */
  definitionChanged: {
    get: function () {
      return this._definitionChanged;
    },
  },

  /**
   * Gets or sets the boolean Property specifying the visibility of the path.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   * @default true
   */
  show: createPropertyDescriptor("show"),

  /**
   * Gets or sets the Property specifying the number of seconds in front of the object to show.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   */
  leadTime: createPropertyDescriptor("leadTime"),

  /**
   * Gets or sets the Property specifying the number of seconds behind the object to show.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   */
  trailTime: createPropertyDescriptor("trailTime"),

  /**
   * Gets or sets the numeric Property specifying the width in pixels.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   * @default 1.0
   */
  width: createPropertyDescriptor("width"),

  /**
   * Gets or sets the Property specifying the maximum number of seconds to step when sampling the position.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   * @default 60
   */
  resolution: createPropertyDescriptor("resolution"),

  /**
   * Gets or sets the Property specifying the material used to draw the path.
   * @memberof PathGraphics.prototype
   * @type {MaterialProperty}
   * @default Color.WHITE
   */
  material: createMaterialPropertyDescriptor("material"),

  /**
   * Gets or sets the {@link DistanceDisplayCondition} Property specifying at what distance from the camera that this path will be displayed.
   * @memberof PathGraphics.prototype
   * @type {Property|undefined}
   */
  distanceDisplayCondition: createPropertyDescriptor(
    "distanceDisplayCondition"
  ),
});

/**
 * Duplicates this instance.
 *
 * @param {PathGraphics} [result] The object onto which to store the result.
 * @returns {PathGraphics} The modified result parameter or a new instance if one was not provided.
 */
PathGraphics.prototype.clone = function (result) {
  if (!defined(result)) {
    return new PathGraphics(this);
  }
  result.show = this.show;
  result.leadTime = this.leadTime;
  result.trailTime = this.trailTime;
  result.width = this.width;
  result.resolution = this.resolution;
  result.material = this.material;
  result.distanceDisplayCondition = this.distanceDisplayCondition;
  return result;
};

/**
 * Assigns each unassigned property on this object to the value
 * of the same property on the provided source object.
 *
 * @param {PathGraphics} source The object to be merged into this object.
 */
PathGraphics.prototype.merge = function (source) {
  //>>includeStart('debug', pragmas.debug);
  if (!defined(source)) {
    throw new DeveloperError("source is required.");
  }
  //>>includeEnd('debug');

  this.show = defaultValue(this.show, source.show);
  this.leadTime = defaultValue(this.leadTime, source.leadTime);
  this.trailTime = defaultValue(this.trailTime, source.trailTime);
  this.width = defaultValue(this.width, source.width);
  this.resolution = defaultValue(this.resolution, source.resolution);
  this.material = defaultValue(this.material, source.material);
  this.distanceDisplayCondition = defaultValue(
    this.distanceDisplayCondition,
    source.distanceDisplayCondition
  );
};
export default PathGraphics;