118 lines
3.6 KiB
JavaScript
118 lines
3.6 KiB
JavaScript
/**
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* @license
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* Cesium - https://github.com/CesiumGS/cesium
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* Version 1.117
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*
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* Copyright 2011-2022 Cesium Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Columbus View (Pat. Pend.)
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*
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* Portions licensed separately.
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* See https://github.com/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
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*/
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import {
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Cartesian3_default,
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Cartographic_default,
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Ellipsoid_default
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} from "./chunk-C5CE4OG6.js";
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import {
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Math_default
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} from "./chunk-4PHPQRSH.js";
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import {
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defaultValue_default
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} from "./chunk-UCPPWV64.js";
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import {
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DeveloperError_default
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} from "./chunk-U4IMCOF5.js";
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import {
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defined_default
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} from "./chunk-BDUJXBVF.js";
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// packages/engine/Source/Core/WebMercatorProjection.js
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function WebMercatorProjection(ellipsoid) {
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this._ellipsoid = defaultValue_default(ellipsoid, Ellipsoid_default.WGS84);
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this._semimajorAxis = this._ellipsoid.maximumRadius;
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this._oneOverSemimajorAxis = 1 / this._semimajorAxis;
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}
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Object.defineProperties(WebMercatorProjection.prototype, {
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/**
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* Gets the {@link Ellipsoid}.
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*
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* @memberof WebMercatorProjection.prototype
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*
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* @type {Ellipsoid}
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* @readonly
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*/
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ellipsoid: {
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get: function() {
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return this._ellipsoid;
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}
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}
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});
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WebMercatorProjection.mercatorAngleToGeodeticLatitude = function(mercatorAngle) {
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return Math_default.PI_OVER_TWO - 2 * Math.atan(Math.exp(-mercatorAngle));
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};
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WebMercatorProjection.geodeticLatitudeToMercatorAngle = function(latitude) {
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if (latitude > WebMercatorProjection.MaximumLatitude) {
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latitude = WebMercatorProjection.MaximumLatitude;
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} else if (latitude < -WebMercatorProjection.MaximumLatitude) {
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latitude = -WebMercatorProjection.MaximumLatitude;
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}
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const sinLatitude = Math.sin(latitude);
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return 0.5 * Math.log((1 + sinLatitude) / (1 - sinLatitude));
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};
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WebMercatorProjection.MaximumLatitude = WebMercatorProjection.mercatorAngleToGeodeticLatitude(
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Math.PI
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);
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WebMercatorProjection.prototype.project = function(cartographic, result) {
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const semimajorAxis = this._semimajorAxis;
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const x = cartographic.longitude * semimajorAxis;
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const y = WebMercatorProjection.geodeticLatitudeToMercatorAngle(
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cartographic.latitude
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) * semimajorAxis;
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const z = cartographic.height;
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if (!defined_default(result)) {
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return new Cartesian3_default(x, y, z);
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}
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result.x = x;
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result.y = y;
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result.z = z;
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return result;
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};
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WebMercatorProjection.prototype.unproject = function(cartesian, result) {
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if (!defined_default(cartesian)) {
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throw new DeveloperError_default("cartesian is required");
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}
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const oneOverEarthSemimajorAxis = this._oneOverSemimajorAxis;
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const longitude = cartesian.x * oneOverEarthSemimajorAxis;
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const latitude = WebMercatorProjection.mercatorAngleToGeodeticLatitude(
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cartesian.y * oneOverEarthSemimajorAxis
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);
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const height = cartesian.z;
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if (!defined_default(result)) {
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return new Cartographic_default(longitude, latitude, height);
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}
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result.longitude = longitude;
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result.latitude = latitude;
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result.height = height;
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return result;
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};
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var WebMercatorProjection_default = WebMercatorProjection;
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export {
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WebMercatorProjection_default
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};
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