@cesium/engine/Source/DataSources/PointGraphics.js

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.

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

/**
 * @typedef {object} PointGraphics.ConstructorOptions
 *
 * Initialization options for the PointGraphics constructor
 *
 * @property {Property | boolean} [show=true] A boolean Property specifying the visibility of the point.
 * @property {Property | number} [pixelSize=1] A numeric Property specifying the size in pixels.
 * @property {Property | HeightReference} [heightReference=HeightReference.NONE] A Property specifying what the height is relative to.
 * @property {Property | Color} [color=Color.WHITE] A Property specifying the {@link Color} of the point.
 * @property {Property | Color} [outlineColor=Color.BLACK] A Property specifying the {@link Color} of the outline.
 * @property {Property | number} [outlineWidth=0] A numeric Property specifying the the outline width in pixels.
 * @property {Property | NearFarScalar} [scaleByDistance] A {@link NearFarScalar} Property used to scale the point based on distance.
 * @property {Property | NearFarScalar} [translucencyByDistance] A {@link NearFarScalar} Property used to set translucency based on distance from the camera.
 * @property {Property | DistanceDisplayCondition} [distanceDisplayCondition] A Property specifying at what distance from the camera that this point will be displayed.
 * @property {Property | number} [disableDepthTestDistance] A Property specifying the distance from the camera at which to disable the depth test to.
 * @property {Property | SplitDirection} [splitDirection] A Property specifying the {@link SplitDirection} split to apply to this point.
 */

/**
 * Describes a graphical point located at the position of the containing {@link Entity}.
 *
 * @alias PointGraphics
 * @constructor
 *
 * @param {PointGraphics.ConstructorOptions} [options] Object describing initialization options
 */
function PointGraphics(options) {
  this._definitionChanged = new Event();
  this._show = undefined;
  this._showSubscription = undefined;
  this._pixelSize = undefined;
  this._pixelSizeSubscription = undefined;
  this._heightReference = undefined;
  this._heightReferenceSubscription = undefined;
  this._color = undefined;
  this._colorSubscription = undefined;
  this._outlineColor = undefined;
  this._outlineColorSubscription = undefined;
  this._outlineWidth = undefined;
  this._outlineWidthSubscription = undefined;
  this._scaleByDistance = undefined;
  this._scaleByDistanceSubscription = undefined;
  this._translucencyByDistance = undefined;
  this._translucencyByDistanceSubscription = undefined;
  this._distanceDisplayCondition = undefined;
  this._distanceDisplayConditionSubscription = undefined;
  this._disableDepthTestDistance = undefined;
  this._disableDepthTestDistanceSubscription = undefined;
  this._splitDirection = undefined;
  this._splitDirectionSubscription = undefined;

  this.merge(options ?? Frozen.EMPTY_OBJECT);
}

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

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

  /**
   * Gets or sets the numeric Property specifying the size in pixels.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default 1
   */
  pixelSize: createPropertyDescriptor("pixelSize"),

  /**
   * Gets or sets the Property specifying the {@link HeightReference}.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default HeightReference.NONE
   */
  heightReference: createPropertyDescriptor("heightReference"),

  /**
   * Gets or sets the Property specifying the {@link Color} of the point.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default Color.WHITE
   */
  color: createPropertyDescriptor("color"),

  /**
   * Gets or sets the Property specifying the {@link Color} of the outline.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default Color.BLACK
   */
  outlineColor: createPropertyDescriptor("outlineColor"),

  /**
   * Gets or sets the numeric Property specifying the the outline width in pixels.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default 0
   */
  outlineWidth: createPropertyDescriptor("outlineWidth"),

  /**
   * Gets or sets the {@link NearFarScalar} Property used to scale the point based on distance.
   * If undefined, a constant size is used.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   */
  scaleByDistance: createPropertyDescriptor("scaleByDistance"),

  /**
   * Gets or sets {@link NearFarScalar} Property specifying the translucency of the point based on the distance from the camera.
   * A point's translucency will interpolate between the {@link NearFarScalar#nearValue} and
   * {@link NearFarScalar#farValue} while the camera distance falls within the lower and upper bounds
   * of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
   * Outside of these ranges the points's translucency remains clamped to the nearest bound.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   */
  translucencyByDistance: createPropertyDescriptor("translucencyByDistance"),

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

  /**
   * Gets or sets the distance from the camera at which to disable the depth test to, for example, prevent clipping against terrain.
   * When set to zero, the depth test is always applied. When set to Number.POSITIVE_INFINITY, the depth test is never applied.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   */
  disableDepthTestDistance: createPropertyDescriptor(
    "disableDepthTestDistance",
  ),

  /**
   * Gets or sets the Property specifying the {@link SplitDirection} of this point.
   * @memberof PointGraphics.prototype
   * @type {Property|undefined}
   * @default SplitDirection.NONE
   */
  splitDirection: createPropertyDescriptor("splitDirection"),
});

/**
 * Duplicates this instance.
 *
 * @param {PointGraphics} [result] The object onto which to store the result.
 * @returns {PointGraphics} The modified result parameter or a new instance if one was not provided.
 */
PointGraphics.prototype.clone = function (result) {
  if (!defined(result)) {
    return new PointGraphics(this);
  }
  result.show = this.show;
  result.pixelSize = this.pixelSize;
  result.heightReference = this.heightReference;
  result.color = this.color;
  result.outlineColor = this.outlineColor;
  result.outlineWidth = this.outlineWidth;
  result.scaleByDistance = this.scaleByDistance;
  result.translucencyByDistance = this._translucencyByDistance;
  result.distanceDisplayCondition = this.distanceDisplayCondition;
  result.disableDepthTestDistance = this.disableDepthTestDistance;
  result.splitDirection = this.splitDirection;
  return result;
};

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

  this.show = this.show ?? source.show;
  this.pixelSize = this.pixelSize ?? source.pixelSize;
  this.heightReference = this.heightReference ?? source.heightReference;
  this.color = this.color ?? source.color;
  this.outlineColor = this.outlineColor ?? source.outlineColor;
  this.outlineWidth = this.outlineWidth ?? source.outlineWidth;
  this.scaleByDistance = this.scaleByDistance ?? source.scaleByDistance;
  this.translucencyByDistance =
    this._translucencyByDistance ?? source.translucencyByDistance;
  this.distanceDisplayCondition =
    this.distanceDisplayCondition ?? source.distanceDisplayCondition;
  this.disableDepthTestDistance =
    this.disableDepthTestDistance ?? source.disableDepthTestDistance;

  this.splitDirection = this.splitDirection ?? source.splitDirection;
};
export default PointGraphics;