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import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import Resource from "../Core/Resource.js";
import IonResource from "../Core/IonResource.js";
import Check from "../Core/Check.js";
import GoogleMaps from "../Core/GoogleMaps.js";
import { GOOGLE_2D_MAPS as createFromIonEndpoint } from "./IonImageryProviderFactory.js";
import UrlTemplateImageryProvider from "./UrlTemplateImageryProvider.js";
const trailingSlashRegex = /\/$/;
/**
* @typedef {object} Google2DImageryProvider.ConstructorOptions
*
* Initialization options for the Google2DImageryProvider constructor
*
* @property {string} key The Google api key to send with tile requests.
* @property {string} session The Google session token that tracks the current state of your map and viewport.
* @property {string|Resource|IonResource} url The Google 2D maps endpoint.
* @property {string} tileWidth The width of each tile in pixels.
* @property {string} tileHeight The height of each tile in pixels.
* @property {Ellipsoid} [ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @property {number} [minimumLevel=0] The minimum level-of-detail supported by the imagery provider. Take care when specifying
* this that the number of tiles at the minimum level is small, such as four or less. A larger number is likely
* to result in rendering problems.
* @property {number} [maximumLevel=22] The maximum level-of-detail supported by the imagery provider.
* @property {Rectangle} [rectangle=Rectangle.MAX_VALUE] The rectangle, in radians, covered by the image.
*/
/**
* <div class="notice">
* This object is normally not instantiated directly, use {@link Google2DImageryProvider.fromIonAssetId} or {@link Google2DImageryProvider.fromUrl}.
* </div>
*
*
* Provides 2D image tiles from {@link https://developers.google.com/maps/documentation/tile/2d-tiles-overview|Google 2D Tiles}.
*
* Google 2D Tiles can only be used with the Google geocoder.
*
* @alias Google2DImageryProvider
* @constructor
*
* @param {Google2DImageryProvider.ConstructorOptions} options Object describing initialization options
*
* @example
* // Google 2D imagery provider
* const googleTilesProvider = Cesium.Google2DImageryProvider.fromIonAssetId({
* assetId: 3830184
* });
* @example
* // Use your own Google api key
* Cesium.GoogleMaps.defaultApiKey = "your-api-key";
*
* const googleTilesProvider = Cesium.Google2DImageryProvider.fromUrl({
* mapType: "SATELLITE"
* });
*
*
* @see {@link https://developers.google.com/maps/documentation/tile/2d-tiles-overview}
* @see {@link https://developers.google.com/maps/documentation/tile/session_tokens}
* @see {@link https://en.wikipedia.org/wiki/IETF_language_tag|IETF Language Tags}
* @see {@link https://cldr.unicode.org/|Common Locale Data Repository region identifiers}
*/
function Google2DImageryProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
this._maximumLevel = options.maximumLevel ?? 22;
this._minimumLevel = options.minimumLevel ?? 0;
//>>includeStart("debug", pragmas.debug);
Check.defined("options.session", options.session);
Check.defined("options.tileWidth", options.tileWidth);
Check.defined("options.tileHeight", options.tileHeight);
Check.defined("options.key", options.key);
//>>includeEnd("debug");
this._session = options.session;
this._key = options.key;
this._tileWidth = options.tileWidth;
this._tileHeight = options.tileHeight;
const resource =
options.url instanceof IonResource
? options.url
: Resource.createIfNeeded(options.url ?? GoogleMaps.mapTilesApiEndpoint);
let templateUrl = resource.getUrlComponent();
Iif (!trailingSlashRegex.test(templateUrl)) {
templateUrl += "/";
}
const tilesUrl = `${templateUrl}v1/2dtiles/{z}/{x}/{y}`;
this._viewportUrl = `${templateUrl}tile/v1/viewport`;
resource.url = tilesUrl;
resource.setQueryParameters({
session: encodeURIComponent(options.session),
key: encodeURIComponent(options.key),
});
let credit;
if (defined(options.credit)) {
credit = options.credit;
Eif (typeof credit === "string") {
credit = new Credit(credit);
}
}
const provider = new UrlTemplateImageryProvider({
url: resource,
credit: credit,
tileWidth: options.tileWidth,
tileHeight: options.tileHeight,
ellipsoid: options.ellipsoid,
rectangle: options.rectangle,
maximumLevel: this._maximumLevel,
minimumLevel: this._minimumLevel,
});
provider._resource = resource;
this._imageryProvider = provider;
// This will be defined for ion resources
this._tileCredits = resource.credits;
this._attributionsByLevel = undefined;
}
Object.defineProperties(Google2DImageryProvider.prototype, {
/**
* Gets the URL of the Google 2D Imagery server.
* @memberof Google2DImageryProvider.prototype
* @type {string}
* @readonly
*/
url: {
get: function () {
return this._imageryProvider.url;
},
},
/**
* Gets the rectangle, in radians, of the imagery provided by the instance.
* @memberof Google2DImageryProvider.prototype
* @type {Rectangle}
* @readonly
*/
rectangle: {
get: function () {
return this._imageryProvider.rectangle;
},
},
/**
* Gets the width of each tile, in pixels.
* @memberof Google2DImageryProvider.prototype
* @type {number}
* @readonly
*/
tileWidth: {
get: function () {
return this._imageryProvider.tileWidth;
},
},
/**
* Gets the height of each tile, in pixels.
* @memberof Google2DImageryProvider.prototype
* @type {number}
* @readonly
*/
tileHeight: {
get: function () {
return this._imageryProvider.tileHeight;
},
},
/**
* Gets the maximum level-of-detail that can be requested.
* @memberof Google2DImageryProvider.prototype
* @type {number|undefined}
* @readonly
*/
maximumLevel: {
get: function () {
return this._imageryProvider.maximumLevel;
},
},
/**
* Gets the minimum level-of-detail that can be requested. Generally,
* a minimum level should only be used when the rectangle of the imagery is small
* enough that the number of tiles at the minimum level is small. An imagery
* provider with more than a few tiles at the minimum level will lead to
* rendering problems.
* @memberof Google2DImageryProvider.prototype
* @type {number}
* @readonly
*/
minimumLevel: {
get: function () {
return this._imageryProvider.minimumLevel;
},
},
/**
* Gets the tiling scheme used by the provider.
* @memberof Google2DImageryProvider.prototype
* @type {TilingScheme}
* @readonly
*/
tilingScheme: {
get: function () {
return this._imageryProvider.tilingScheme;
},
},
/**
* Gets the tile discard policy. If not undefined, the discard policy is responsible
* for filtering out "missing" tiles via its shouldDiscardImage function. If this function
* returns undefined, no tiles are filtered.
* @memberof Google2DImageryProvider.prototype
* @type {TileDiscardPolicy}
* @readonly
*/
tileDiscardPolicy: {
get: function () {
return this._imageryProvider.tileDiscardPolicy;
},
},
/**
* Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
* to the event, you will be notified of the error and can potentially recover from it. Event listeners
* are passed an instance of {@link TileProviderError}.
* @memberof Google2DImageryProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent: {
get: function () {
return this._imageryProvider.errorEvent;
},
},
/**
* Gets the credit to display when this imagery provider is active. Typically this is used to credit
* the source of the imagery.
* @memberof Google2DImageryProvider.prototype
* @type {Credit}
* @readonly
*/
credit: {
get: function () {
return this._imageryProvider.credit;
},
},
/**
* Gets the proxy used by this provider.
* @memberof Google2DImageryProvider.prototype
* @type {Proxy}
* @readonly
*/
proxy: {
get: function () {
return this._imageryProvider.proxy;
},
},
/**
* Gets a value indicating whether or not the images provided by this imagery provider
* include an alpha channel. If this property is false, an alpha channel, if present, will
* be ignored. If this property is true, any images without an alpha channel will be treated
* as if their alpha is 1.0 everywhere. When this property is false, memory usage
* and texture upload time are reduced.
* @memberof Google2DImageryProvider.prototype
* @type {boolean}
* @readonly
*/
hasAlphaChannel: {
get: function () {
return this._imageryProvider.hasAlphaChannel;
},
},
});
/**
* Creates an {@link ImageryProvider} which provides 2D global tiled imagery from {@link https://developers.google.com/maps/documentation/tile/2d-tiles-overview|Google 2D Tiles}, streamed using the Cesium ion REST API.
* @param {object} options Object with the following properties:
* @param {string} options.assetId The Cesium ion asset id.
* @param {"satellite" | "terrain" | "roadmap"} [options.mapType="satellite"] The map type of the Google map imagery. Valid options are satellite, terrain, and roadmap. If overlayLayerType is set, mapType is ignored and a transparent overlay is returned. If overlayMapType is undefined, then a basemap of mapType is returned. layerRoadmap overlayLayerType is included in terrain and roadmap mapTypes.
* @param {string} [options.language="en_US"] an IETF language tag that specifies the language used to display information on the tiles
* @param {string} [options.region="US"] A Common Locale Data Repository region identifier (two uppercase letters) that represents the physical location of the user.
* @param {"layerRoadmap" | "layerStreetview" | "layerTraffic"} [options.overlayLayerType] Returns a transparent overlay map with the specified layerType. If no value is provided, a basemap of mapType is returned. Use multiple instances of Google2DImageryProvider to add multiple Google Maps overlays to a scene. layerRoadmap is included in terrain and roadmap mapTypes, so adding as overlay to terrain or roadmap has no effect.
* @param {object} [options.styles] An array of JSON style objects that specify the appearance and detail level of map features such as roads, parks, and built-up areas. Styling is used to customize the standard Google base map. The styles parameter is valid only if the mapType is roadmap. For the complete style syntax, see the ({@link https://developers.google.com/maps/documentation/tile/style-reference|Google Style Reference}).
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @param {number} [options.minimumLevel=0] The minimum level-of-detail supported by the imagery provider. Take care when specifying
* this that the number of tiles at the minimum level is small, such as four or less. A larger number is likely
* to result in rendering problems.
* @param {number} [options.maximumLevel=22] The maximum level-of-detail supported by the imagery provider.
* @param {Rectangle} [options.rectangle=Rectangle.MAX_VALUE] The rectangle, in radians, covered by the image.
* @param {Credit|string} [options.credit] A credit for the data source, which is displayed on the canvas.
*
* @returns {Promise<Google2DImageryProvider>} A promise that resolves to the created Google2DImageryProvider.
*
* @example
* // Google 2D imagery provider
* const googleTilesProvider = Cesium.Google2DImageryProvider.fromIonAssetId({
* assetId: 3830184
* });
* @example
* // Google 2D roadmap overlay with custom styles
* const googleTileProvider = Cesium.Google2DImageryProvider.fromIonAssetId({
* assetId: 3830184,
* overlayLayerType: "layerRoadmap",
* styles: [
* {
* stylers: [{ hue: "#00ffe6" }, { saturation: -20 }],
* },
* {
* featureType: "road",
* elementType: "geometry",
* stylers: [{ lightness: 100 }, { visibility: "simplified" }],
* },
* ],
* });
*/
Google2DImageryProvider.fromIonAssetId = async function (options) {
options = options ?? {};
options.mapType = options.mapType ?? "satellite";
options.language = options.language ?? "en_US";
options.region = options.region ?? "US";
const overlayLayerType = options.overlayLayerType;
//>>includeStart("debug", pragmas.debug);
Iif (defined(overlayLayerType)) {
Check.typeOf.string("options.overlayLayerType", overlayLayerType);
}
Check.defined("options.assetId", options.assetId);
//>>includeEnd("debug");
const queryOptions = buildQueryOptions(options);
const endpointResource = IonResource._createEndpointResource(
options.assetId,
{
queryParameters: {
options: JSON.stringify(queryOptions),
},
},
);
const providerOptions = {
language: options.language,
region: options.region,
ellipsoid: options.ellipsoid,
minimumLevel: options.minimumLevel,
maximumLevel: options.maximumLevel,
rectangle: options.rectangle,
credit: options.credit,
};
const endpoint = await endpointResource.fetchJson();
const url = endpoint.options.url;
delete endpoint.options.url;
endpoint.options = {
...endpoint.options,
...providerOptions,
};
return createFromIonEndpoint(url, endpoint, endpointResource);
};
/**
* Creates an {@link ImageryProvider} which provides 2D global tiled imagery from {@link https://developers.google.com/maps/documentation/tile/2d-tiles-overview|Google 2D Tiles}.
* @param {object} options Object with the following properties:
* @param {string} [options.key=GoogleMaps.defaultApiKey] Your API key to access Google 2D Tiles. See {@link https://developers.google.com/maps/documentation/javascript/get-api-key} for instructions on how to create your own key.
* @param {"satellite" | "terrain" | "roadmap"} [options.mapType="satellite"] The map type of the Google map imagery. Valid options are satellite, terrain, and roadmap. If overlayLayerType is set, mapType is ignored and a transparent overlay is returned. If overlayMapType is undefined, then a basemap of mapType is returned. layerRoadmap overlayLayerType is included in terrain and roadmap mapTypes.
* @param {string} [options.language="en_US"] an IETF language tag that specifies the language used to display information on the tiles
* @param {string} [options.region="US"] A Common Locale Data Repository region identifier (two uppercase letters) that represents the physical location of the user.
* @param {"layerRoadmap" | "layerStreetview" | "layerTraffic"} [options.overlayLayerType] Returns a transparent overlay map with the specified layerType. If no value is provided, a basemap of mapType is returned. Use multiple instances of Google2DImageryProvider to add multiple Google Maps overlays to a scene. layerRoadmap is included in terrain and roadmap mapTypes, so adding as overlay to terrain or roadmap has no effect.
* @param {object} [options.styles] An array of JSON style objects that specify the appearance and detail level of map features such as roads, parks, and built-up areas. Styling is used to customize the standard Google base map. The styles parameter is valid only if the mapType is roadmap. For the complete style syntax, see the ({@link https://developers.google.com/maps/documentation/tile/style-reference|Google Style Reference}).
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @param {number} [options.minimumLevel=0] The minimum level-of-detail supported by the imagery provider. Take care when specifying
* this that the number of tiles at the minimum level is small, such as four or less. A larger number is likely
* to result in rendering problems.
* @param {number} [options.maximumLevel=22] The maximum level-of-detail supported by the imagery provider.
* @param {Rectangle} [options.rectangle=Rectangle.MAX_VALUE] The rectangle, in radians, covered by the image.
* @param {Credit|string} [options.credit] A credit for the data source, which is displayed on the canvas.
*
* @returns {Promise<Google2DImageryProvider>} A promise that resolves to the created Google2DImageryProvider.
*
* @example
* // Use your own Google api key
* Cesium.GoogleMaps.defaultApiKey = "your-api-key";
*
* const googleTilesProvider = Cesium.Google2DImageryProvider.fromUrl({
* mapType: "satellite"
* });
* @example
* // Google 2D roadmap overlay with custom styles
* Cesium.GoogleMaps.defaultApiKey = "your-api-key";
*
* const googleTileProvider = Cesium.Google2DImageryProvider.fromUrl({
* overlayLayerType: "layerRoadmap",
* styles: [
* {
* stylers: [{ hue: "#00ffe6" }, { saturation: -20 }],
* },
* {
* featureType: "road",
* elementType: "geometry",
* stylers: [{ lightness: 100 }, { visibility: "simplified" }],
* },
* ],
* });
*/
Google2DImageryProvider.fromUrl = async function (options) {
options = options ?? {};
options.mapType = options.mapType ?? "satellite";
options.language = options.language ?? "en_US";
options.region = options.region ?? "US";
options.url = options.url ?? GoogleMaps.mapTilesApiEndpoint;
options.key = options.key ?? GoogleMaps.defaultApiKey;
const overlayLayerType = options.overlayLayerType;
//>>includeStart("debug", pragmas.debug);
if (defined(overlayLayerType)) {
Check.typeOf.string("overlayLayerType", overlayLayerType);
}
if (!defined(options.key) && !defined(GoogleMaps.defaultApiKey)) {
throw new DeveloperError(
"options.key or GoogleMaps.defaultApiKey is required.",
);
}
//>>includeEnd("debug");
const sessionJson = await createGoogleImagerySession(options);
return new Google2DImageryProvider({
...sessionJson,
...options,
credit: options.credit ?? GoogleMaps.getDefaultCredit(),
});
};
/**
* Gets the credits to be displayed when a given tile is displayed.
*
* @param {number} x The tile X coordinate.
* @param {number} y The tile Y coordinate.
* @param {number} level The tile level;
* @returns {Credit[]|undefined} The credits to be displayed when the tile is displayed.
*/
Google2DImageryProvider.prototype.getTileCredits = function (x, y, level) {
const hasAttributions = defined(this._attributionsByLevel);
Eif (!hasAttributions || !defined(this._tileCredits)) {
return undefined;
}
const innerCredits = this._attributionsByLevel.get(level);
if (!defined(this._tileCredits)) {
return innerCredits;
}
return this._tileCredits.concat(innerCredits);
};
/**
* Requests the image for a given tile.
*
* @param {number} x The tile X coordinate.
* @param {number} y The tile Y coordinate.
* @param {number} level The tile level.
* @param {Request} [request] The request object. Intended for internal use only.
* @returns {Promise<ImageryTypes>|undefined} A promise for the image that will resolve when the image is available, or
* undefined if there are too many active requests to the server, and the request should be retried later.
*/
Google2DImageryProvider.prototype.requestImage = function (
x,
y,
level,
request,
) {
const promise = this._imageryProvider.requestImage(x, y, level, request);
// If the requestImage call returns undefined, it couldn't be scheduled this frame. Make sure to return undefined so this can be handled upstream.
Iif (!defined(promise)) {
return undefined;
}
// Asynchronously request and populate _attributionsByLevel if it hasn't been already. We do this here so that the promise can be properly awaited.
Eif (promise && !defined(this._attributionsByLevel)) {
return Promise.all([promise, this.getViewportCredits()]).then(
(results) => results[0],
);
}
return promise;
};
/**
* Picking features is not currently supported by this imagery provider, so this function simply returns
* undefined.
*
* @param {number} x The tile X coordinate.
* @param {number} y The tile Y coordinate.
* @param {number} level The tile level.
* @param {number} longitude The longitude at which to pick features.
* @param {number} latitude The latitude at which to pick features.
* @return {undefined} Undefined since picking is not supported.
*/
Google2DImageryProvider.prototype.pickFeatures = function (
x,
y,
level,
longitude,
latitude,
) {
return undefined;
};
/**
* Get attribution for imagery from Google Maps to display in the credits
* @private
* @return {Promise<Map<Credit[]>>} The list of attribution sources to display in the credits.
*/
Google2DImageryProvider.prototype.getViewportCredits = async function () {
const maximumLevel = this._maximumLevel;
const promises = [];
for (let level = 0; level < maximumLevel + 1; level++) {
promises.push(
fetchViewportAttribution(
this._viewportUrl,
this._key,
this._session,
level,
),
);
}
const results = await Promise.all(promises);
const attributionsByLevel = new Map();
for (let level = 0; level < maximumLevel + 1; level++) {
const credits = [];
const attributions = results[level];
if (attributions) {
const levelCredits = new Credit(attributions);
credits.push(levelCredits);
}
attributionsByLevel.set(level, credits);
}
this._attributionsByLevel = attributionsByLevel;
return attributionsByLevel;
};
async function fetchViewportAttribution(url, key, session, level) {
const viewport = await Resource.fetch({
url: url,
queryParameters: {
key,
session,
zoom: level,
north: 90,
south: -90,
east: 180,
west: -180,
},
data: JSON.stringify(Frozen.EMPTY_OBJECT),
});
const viewportJson = JSON.parse(viewport);
return viewportJson.copyright;
}
function buildQueryOptions(options) {
const { mapType, overlayLayerType, styles } = options;
const queryOptions = {
mapType,
overlay: false,
};
if (mapType === "terrain" && !defined(overlayLayerType)) {
queryOptions.layerTypes = ["layerRoadmap"];
}
if (defined(overlayLayerType)) {
queryOptions.mapType = "satellite";
queryOptions.overlay = true;
queryOptions.layerTypes = [overlayLayerType];
}
if (defined(styles)) {
queryOptions.styles = styles;
}
return queryOptions;
}
async function createGoogleImagerySession(options) {
const { language, region, key, url } = options;
const queryOptions = buildQueryOptions(options);
let baseUrl = url.url ?? url;
if (!trailingSlashRegex.test(baseUrl)) {
baseUrl += "/";
}
const response = await Resource.post({
url: `${baseUrl}v1/createSession`,
queryParameters: { key: key },
data: JSON.stringify({
...queryOptions,
language,
region,
}),
});
const responseJson = JSON.parse(response);
return responseJson;
}
export default Google2DImageryProvider;
|