Add existing to tracked

node_modules/@cesium/engine/Source/DataSources/PolylineArrowMaterialProperty.js

@@ -0,0 +1,110 @@
+import Color from "../Core/Color.js";
+import defined from "../Core/defined.js";
+import Event from "../Core/Event.js";
+import JulianDate from "../Core/JulianDate.js";
+import createPropertyDescriptor from "./createPropertyDescriptor.js";
+import Property from "./Property.js";
+
+/**
+ * A {@link MaterialProperty} that maps to PolylineArrow {@link Material} uniforms.
+ *
+ * @param {Property|Color} [color=Color.WHITE] The {@link Color} Property to be used.
+ *
+ * @alias PolylineArrowMaterialProperty
+ * @constructor
+ */
+function PolylineArrowMaterialProperty(color) {
+  this._definitionChanged = new Event();
+  this._color = undefined;
+  this._colorSubscription = undefined;
+
+  this.color = color;
+}
+
+Object.defineProperties(PolylineArrowMaterialProperty.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 PolylineArrowMaterialProperty.prototype
+   *
+   * @type {boolean}
+   * @readonly
+   */
+  isConstant: {
+    get: function () {
+      return Property.isConstant(this._color);
+    },
+  },
+  /**
+   * 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 PolylineArrowMaterialProperty.prototype
+   *
+   * @type {Event}
+   * @readonly
+   */
+  definitionChanged: {
+    get: function () {
+      return this._definitionChanged;
+    },
+  },
+  /**
+   * Gets or sets the {@link Color} {@link Property}.
+   * @memberof PolylineArrowMaterialProperty.prototype
+   * @type {Property|undefined}
+   * @default Color.WHITE
+   */
+  color: createPropertyDescriptor("color"),
+});
+
+/**
+ * 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.
+ */
+PolylineArrowMaterialProperty.prototype.getType = function (time) {
+  return "PolylineArrow";
+};
+
+const timeScratch = new JulianDate();
+
+/**
+ * Gets the value of the property at the provided time.
+ *
+ * @param {JulianDate} [time=JulianDate.now()] The time for which to retrieve the value. If omitted, the current system time is used.
+ * @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.
+ */
+PolylineArrowMaterialProperty.prototype.getValue = function (time, result) {
+  if (!defined(time)) {
+    time = JulianDate.now(timeScratch);
+  }
+  if (!defined(result)) {
+    result = {};
+  }
+  result.color = Property.getValueOrClonedDefault(
+    this._color,
+    time,
+    Color.WHITE,
+    result.color,
+  );
+  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.
+ */
+PolylineArrowMaterialProperty.prototype.equals = function (other) {
+  return (
+    this === other || //
+    (other instanceof PolylineArrowMaterialProperty && //
+      Property.equals(this._color, other._color))
+  );
+};
+export default PolylineArrowMaterialProperty;