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node_modules/@cesium/engine/Build/Workers/chunk-SDFHDNS4.js

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+/**
+ * @license
+ * Cesium - https://github.com/CesiumGS/cesium
+ * Version 1.143.0
+ *
+ * Copyright 2011-2022 Cesium Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Columbus View (Pat. Pend.)
+ *
+ * Portions licensed separately.
+ * See https://github.com/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
+ */
+
+import {
+  Cartographic_default,
+  Ellipsoid_default
+} from "./chunk-FJWZMGOQ.js";
+import {
+  Cartesian3_default
+} from "./chunk-PEDU33QG.js";
+import {
+  Math_default
+} from "./chunk-C7JQVRLM.js";
+import {
+  DeveloperError_default
+} from "./chunk-6YR6JBMY.js";
+import {
+  defined_default
+} from "./chunk-AHWAZRBV.js";
+
+// packages/engine/Source/Core/WebMercatorProjection.js
+var WebMercatorProjection = class _WebMercatorProjection {
+  /**
+   * @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid.
+   */
+  constructor(ellipsoid) {
+    this._ellipsoid = ellipsoid ?? Ellipsoid_default.WGS84;
+    this._semimajorAxis = this._ellipsoid.maximumRadius;
+    this._oneOverSemimajorAxis = 1 / this._semimajorAxis;
+  }
+  /**
+   * Gets the {@link Ellipsoid}.
+   *
+   * @type {Ellipsoid}
+   * @readonly
+   */
+  get ellipsoid() {
+    return this._ellipsoid;
+  }
+  /**
+   * Converts a Mercator angle, in the range -PI to PI, to a geodetic latitude
+   * in the range -PI/2 to PI/2.
+   *
+   * @param {number} mercatorAngle The angle to convert.
+   * @returns {number} The geodetic latitude in radians.
+   */
+  static mercatorAngleToGeodeticLatitude(mercatorAngle) {
+    return Math_default.PI_OVER_TWO - 2 * Math.atan(Math.exp(-mercatorAngle));
+  }
+  /**
+   * Converts a geodetic latitude in radians, in the range -PI/2 to PI/2, to a Mercator
+   * angle in the range -PI to PI.
+   *
+   * @param {number} latitude The geodetic latitude in radians.
+   * @returns {number} The Mercator angle.
+   */
+  static geodeticLatitudeToMercatorAngle(latitude) {
+    if (latitude > _WebMercatorProjection.MaximumLatitude) {
+      latitude = _WebMercatorProjection.MaximumLatitude;
+    } else if (latitude < -_WebMercatorProjection.MaximumLatitude) {
+      latitude = -_WebMercatorProjection.MaximumLatitude;
+    }
+    const sinLatitude = Math.sin(latitude);
+    return 0.5 * Math.log((1 + sinLatitude) / (1 - sinLatitude));
+  }
+  /**
+   * Converts geodetic ellipsoid coordinates, in radians, to the equivalent Web Mercator
+   * X, Y, Z coordinates expressed in meters and returned in a {@link Cartesian3}.  The height
+   * is copied unmodified to the Z coordinate.
+   *
+   * @param {Cartographic} cartographic The cartographic coordinates in radians.
+   * @param {Cartesian3} [result] The instance to which to copy the result, or undefined if a
+   *        new instance should be created.
+   * @returns {Cartesian3} The equivalent web mercator X, Y, Z coordinates, in meters.
+   */
+  project(cartographic, result) {
+    const semimajorAxis = this._semimajorAxis;
+    const x = cartographic.longitude * semimajorAxis;
+    const y = _WebMercatorProjection.geodeticLatitudeToMercatorAngle(
+      cartographic.latitude
+    ) * semimajorAxis;
+    const z = cartographic.height;
+    if (!defined_default(result)) {
+      return new Cartesian3_default(x, y, z);
+    }
+    result.x = x;
+    result.y = y;
+    result.z = z;
+    return result;
+  }
+  /**
+   * Converts Web Mercator X, Y coordinates, expressed in meters, to a {@link Cartographic}
+   * containing geodetic ellipsoid coordinates.  The Z coordinate is copied unmodified to the
+   * height.
+   *
+   * @param {Cartesian3} cartesian The web mercator Cartesian position to unrproject with height (z) in meters.
+   * @param {Cartographic} [result] The instance to which to copy the result, or undefined if a
+   *        new instance should be created.
+   * @returns {Cartographic} The equivalent cartographic coordinates.
+   */
+  unproject(cartesian, result) {
+    if (!defined_default(cartesian)) {
+      throw new DeveloperError_default("cartesian is required");
+    }
+    const oneOverEarthSemimajorAxis = this._oneOverSemimajorAxis;
+    const longitude = cartesian.x * oneOverEarthSemimajorAxis;
+    const latitude = _WebMercatorProjection.mercatorAngleToGeodeticLatitude(
+      cartesian.y * oneOverEarthSemimajorAxis
+    );
+    const height = cartesian.z;
+    if (!defined_default(result)) {
+      return new Cartographic_default(longitude, latitude, height);
+    }
+    result.longitude = longitude;
+    result.latitude = latitude;
+    result.height = height;
+    return result;
+  }
+};
+WebMercatorProjection.MaximumLatitude = WebMercatorProjection.mercatorAngleToGeodeticLatitude(Math.PI);
+var WebMercatorProjection_default = WebMercatorProjection;
+
+export {
+  WebMercatorProjection_default
+};