Add existing to tracked

node_modules/@cesium/engine/Source/Scene/ClippingPolygon.js

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+import Check from "../Core/Check.js";
+import Cartesian3 from "../Core/Cartesian3.js";
+import Cartographic from "../Core/Cartographic.js";
+import defined from "../Core/defined.js";
+import Ellipsoid from "../Core/Ellipsoid.js";
+import CesiumMath from "../Core/Math.js";
+import PolygonGeometry from "../Core/PolygonGeometry.js";
+import Rectangle from "../Core/Rectangle.js";
+
+/**
+ * A geodesic polygon to be used with {@link ClippingPlaneCollection} for selectively hiding regions in a model, a 3D tileset, or the globe.
+ * @alias ClippingPolygon
+ * @constructor
+ *
+ * @param {object} options Object with the following properties:
+ * @param {Cartesian3[]} options.positions A list of three or more Cartesian coordinates defining the outer ring of the clipping polygon.
+ * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.default]
+ *
+ * @example
+ * const positions = Cesium.Cartesian3.fromRadiansArray([
+ *     -1.3194369277314022,
+ *     0.6988062530900625,
+ *     -1.31941,
+ *     0.69879,
+ *     -1.3193955980204217,
+ *     0.6988091578771254,
+ *     -1.3193931220959367,
+ *     0.698743632490865,
+ *     -1.3194358224045408,
+ *     0.6987471965556998,
+ * ]);
+ *
+ * const polygon = new Cesium.ClippingPolygon({
+ *     positions: positions
+ * });
+ */
+function ClippingPolygon(options) {
+  //>>includeStart('debug', pragmas.debug);
+  Check.typeOf.object("options", options);
+  Check.typeOf.object("options.positions", options.positions);
+  Check.typeOf.number.greaterThanOrEquals(
+    "options.positions.length",
+    options.positions.length,
+    3,
+  );
+  //>>includeEnd('debug');
+
+  this._ellipsoid = options.ellipsoid ?? Ellipsoid.default;
+  this._positions = copyArrayCartesian3(options.positions);
+
+  /**
+   * A copy of the input positions.
+   *
+   * This is used to detect modifications of the positions in
+   * <code>coputeRectangle</code>: The rectangle only has
+   * to be re-computed when these positions have changed.
+   *
+   * @type {Cartesian3[]|undefined}
+   * @private
+   */
+  this._cachedPositions = undefined;
+
+  /**
+   * A cached version of the rectangle that is computed in
+   * <code>computeRectangle</code>.
+   *
+   * This is only re-computed when the positions have changed, as
+   * determined  by comparing the <code>_positions</code> to the
+   * <code>_cachedPositions</code>
+   *
+   * @type {Rectangle|undefined}
+   * @private
+   */
+  this._cachedRectangle = undefined;
+}
+
+/**
+ * Returns a deep copy of the given array.
+ *
+ * If the input is undefined, then <code>undefined</code> is returned.
+ *
+ * Otherwise, the result will be a copy of the given array, where
+ * each element is copied with <code>Cartesian3.clone</code>.
+ *
+ * @param {Cartesian3[]|undefined} input The input array
+ * @returns {Cartesian3[]|undefined} The copy
+ * @ignore
+ */
+function copyArrayCartesian3(input) {
+  if (!defined(input)) {
+    return undefined;
+  }
+  const n = input.length;
+  const output = Array(n);
+  for (let i = 0; i < n; i++) {
+    output[i] = Cartesian3.clone(input[i]);
+  }
+  return output;
+}
+
+/**
+ * Returns whether the given arrays are component-wise equal.
+ *
+ * When both arrays are undefined, then <code>true</code> is returned.
+ * When only one array is defined, or they are both defined but have
+ * different lengths, then <code>false</code> is returned.
+ *
+ * Otherwise, returns whether the corresponding elements of the arrays
+ * are equal, as of <code>Cartesian3.equals</code>.
+ *
+ * @param {Cartesian3[]|undefined} a The first array
+ * @param {Cartesian3[]|undefined} b The second array
+ * @returns {boolean} Whether the arrays are equal
+ * @ignore
+ */
+function equalsArrayCartesian3(a, b) {
+  if (!defined(a) && !defined(b)) {
+    return true;
+  }
+  if (defined(a) !== defined(b)) {
+    return false;
+  }
+  if (a.length !== b.length) {
+    return false;
+  }
+  const n = a.length;
+  for (let i = 0; i < n; i++) {
+    const ca = a[i];
+    const cb = b[i];
+    if (!Cartesian3.equals(ca, cb)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+Object.defineProperties(ClippingPolygon.prototype, {
+  /**
+   * Returns the total number of positions in the polygon, include any holes.
+   *
+   * @memberof ClippingPolygon.prototype
+   * @type {number}
+   * @readonly
+   */
+  length: {
+    get: function () {
+      return this._positions.length;
+    },
+  },
+  /**
+   * Returns the outer ring of positions.
+   *
+   * @memberof ClippingPolygon.prototype
+   * @type {Cartesian3[]}
+   * @readonly
+   */
+  positions: {
+    get: function () {
+      return this._positions;
+    },
+  },
+  /**
+   * Returns the ellipsoid used to project the polygon onto surfaces when clipping.
+   *
+   * @memberof ClippingPolygon.prototype
+   * @type {Ellipsoid}
+   * @readonly
+   */
+  ellipsoid: {
+    get: function () {
+      return this._ellipsoid;
+    },
+  },
+});
+
+/**
+ * Clones the ClippingPolygon without setting its ownership.
+ * @param {ClippingPolygon} polygon The ClippingPolygon to be cloned
+ * @param {ClippingPolygon} [result] The object on which to store the cloned parameters.
+ * @returns {ClippingPolygon} a clone of the input ClippingPolygon
+ */
+ClippingPolygon.clone = function (polygon, result) {
+  //>>includeStart('debug', pragmas.debug);
+  Check.typeOf.object("polygon", polygon);
+  //>>includeEnd('debug');
+
+  if (!defined(result)) {
+    return new ClippingPolygon({
+      positions: polygon.positions,
+      ellipsoid: polygon.ellipsoid,
+    });
+  }
+
+  result._ellipsoid = polygon.ellipsoid;
+  result._positions.length = 0;
+  result._positions.push(...polygon.positions);
+  return result;
+};
+
+/**
+ * Compares the provided ClippingPolygons and returns
+ * <code>true</code> if they are equal, <code>false</code> otherwise.
+ *
+ * @param {ClippingPolygon} left The first polygon.
+ * @param {ClippingPolygon} right The second polygon.
+ * @returns {boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
+ */
+ClippingPolygon.equals = function (left, right) {
+  //>>includeStart('debug', pragmas.debug);
+  Check.typeOf.object("left", left);
+  Check.typeOf.object("right", right);
+  //>>includeEnd('debug');
+
+  return (
+    left.ellipsoid.equals(right.ellipsoid) && left.positions === right.positions
+  );
+};
+
+/**
+ * Computes a cartographic rectangle which encloses the polygon defined by the list of positions, including cases over the international date line and the poles.
+ *
+ * @param {Rectangle} [result] An object in which to store the result.
+ * @returns {Rectangle} The result rectangle
+ */
+ClippingPolygon.prototype.computeRectangle = function (result) {
+  if (equalsArrayCartesian3(this._positions, this._cachedPositions)) {
+    return Rectangle.clone(this._cachedRectangle, result);
+  }
+  const rectangle = PolygonGeometry.computeRectangleFromPositions(
+    this.positions,
+    this.ellipsoid,
+    undefined,
+    result,
+  );
+  this._cachedPositions = copyArrayCartesian3(this._positions);
+  this._cachedRectangle = Rectangle.clone(rectangle);
+  return rectangle;
+};
+
+const scratchRectangle = new Rectangle();
+const spherePointScratch = new Cartesian3();
+/**
+ * Computes a rectangle with the spherical extents that encloses the polygon defined by the list of positions, including cases over the international date line and the poles.
+ *
+ * @private
+ *
+ * @param {Rectangle} [result] An object in which to store the result.
+ * @returns {Rectangle} The result rectangle with spherical extents.
+ */
+ClippingPolygon.prototype.computeSphericalExtents = function (result) {
+  if (!defined(result)) {
+    result = new Rectangle();
+  }
+
+  const rectangle = this.computeRectangle(scratchRectangle);
+
+  let spherePoint = Cartographic.toCartesian(
+    Rectangle.southwest(rectangle),
+    this.ellipsoid,
+    spherePointScratch,
+  );
+
+  // Project into plane with vertical for latitude
+  let magXY = Math.sqrt(
+    spherePoint.x * spherePoint.x + spherePoint.y * spherePoint.y,
+  );
+
+  // Use fastApproximateAtan2 for alignment with shader
+  let sphereLatitude = CesiumMath.fastApproximateAtan2(magXY, spherePoint.z);
+  let sphereLongitude = CesiumMath.fastApproximateAtan2(
+    spherePoint.x,
+    spherePoint.y,
+  );
+
+  result.south = sphereLatitude;
+  result.west = sphereLongitude;
+
+  spherePoint = Cartographic.toCartesian(
+    Rectangle.northeast(rectangle),
+    this.ellipsoid,
+    spherePointScratch,
+  );
+
+  // Project into plane with vertical for latitude
+  magXY = Math.sqrt(
+    spherePoint.x * spherePoint.x + spherePoint.y * spherePoint.y,
+  );
+
+  // Use fastApproximateAtan2 for alignment with shader
+  sphereLatitude = CesiumMath.fastApproximateAtan2(magXY, spherePoint.z);
+  sphereLongitude = CesiumMath.fastApproximateAtan2(
+    spherePoint.x,
+    spherePoint.y,
+  );
+
+  result.north = sphereLatitude;
+  result.east = sphereLongitude;
+
+  return result;
+};
+
+export default ClippingPolygon;