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import Cartographic from "../Core/Cartographic.js";
import Check from "../Core/Check.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import GeographicProjection from "../Core/GeographicProjection.js";
import GeographicTilingScheme from "../Core/GeographicTilingScheme.js";
import Rectangle from "../Core/Rectangle.js";
import RequestErrorEvent from "../Core/RequestErrorEvent.js";
import Resource from "../Core/Resource.js";
import RuntimeError from "../Core/RuntimeError.js";
import TileProviderError from "../Core/TileProviderError.js";
import WebMercatorTilingScheme from "../Core/WebMercatorTilingScheme.js";
import UrlTemplateImageryProvider from "./UrlTemplateImageryProvider.js";
/**
* @typedef {object} TileMapServiceImageryProvider.ConstructorOptions
*
* Initialization options for the TileMapServiceImageryProvider constructor
*
* @property {string} [fileExtension='png'] The file extension for images on the server.
* @property {Credit|string} [credit=''] A credit for the data source, which is displayed on the canvas.
* @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] The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit.
* @property {Rectangle} [rectangle=Rectangle.MAX_VALUE] The rectangle, in radians, covered by the image.
* @property {TilingScheme} [tilingScheme] The tiling scheme specifying how the ellipsoidal
* surface is broken into tiles. If this parameter is not provided, a {@link WebMercatorTilingScheme}
* is used.
* @property {Ellipsoid} [ellipsoid] The ellipsoid. If the tilingScheme is specified,
* this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither
* parameter is specified, the WGS84 ellipsoid is used.
* @property {number} [tileWidth=256] Pixel width of image tiles.
* @property {number} [tileHeight=256] Pixel height of image tiles.
* @property {boolean} [flipXY] Older versions of gdal2tiles.py flipped X and Y values in tilemapresource.xml.
* @property {TileDiscardPolicy} [tileDiscardPolicy] A policy for discarding tile images according to some criteria
* Specifying this option will do the same, allowing for loading of these incorrect tilesets.
*/
/**
* <div class="notice">
* To construct a TileMapServiceImageryProvider, call {@link TileMapServiceImageryProvider.fromUrl}. Do not call the constructor directly.
* </div>
*
* An imagery provider that provides tiled imagery as generated by
* {@link http://www.maptiler.org/|MapTiler}, {@link http://www.klokan.cz/projects/gdal2tiles/|GDAL2Tiles}, etc.
*
* @alias TileMapServiceImageryProvider
* @constructor
* @extends UrlTemplateImageryProvider
*
* @param {TileMapServiceImageryProvider.ConstructorOptions} [options] Object describing initialization options
*
* @see ArcGisMapServerImageryProvider
* @see BingMapsImageryProvider
* @see GoogleEarthEnterpriseMapsProvider
* @see OpenStreetMapImageryProvider
* @see SingleTileImageryProvider
* @see WebMapServiceImageryProvider
* @see WebMapTileServiceImageryProvider
* @see UrlTemplateImageryProvider
*
* @example
* const tms = await Cesium.TileMapServiceImageryProvider.fromUrl(
* "../images/cesium_maptiler/Cesium_Logo_Color", {
* fileExtension: 'png',
* maximumLevel: 4,
* rectangle: new Cesium.Rectangle(
* Cesium.Math.toRadians(-120.0),
* Cesium.Math.toRadians(20.0),
* Cesium.Math.toRadians(-60.0),
* Cesium.Math.toRadians(40.0))
* });
*/
function TileMapServiceImageryProvider(options) {
UrlTemplateImageryProvider.call(this, options);
}
TileMapServiceImageryProvider._requestMetadata = async function (
options,
tmsResource,
xmlResource,
provider,
) {
// Try to load remaining parameters from XML
try {
const xml = await xmlResource.fetchXML();
return TileMapServiceImageryProvider._metadataSuccess(
xml,
options,
tmsResource,
xmlResource,
provider,
);
} catch (e) {
if (e instanceof RequestErrorEvent) {
return TileMapServiceImageryProvider._metadataFailure(
options,
tmsResource,
);
}
throw e;
}
};
/**
* Creates a TileMapServiceImageryProvider from the specified url.
*
* @param {Resource|string} url Path to image tiles on server.
* @param {TileMapServiceImageryProvider.ConstructorOptions} [options] Object describing initialization options.
* @returns {Promise<TileMapServiceImageryProvider>} A promise that resolves to the created TileMapServiceImageryProvider.
*
* @example
* const tms = await Cesium.TileMapServiceImageryProvider.fromUrl(
* '../images/cesium_maptiler/Cesium_Logo_Color', {
* fileExtension: 'png',
* maximumLevel: 4,
* rectangle: new Cesium.Rectangle(
* Cesium.Math.toRadians(-120.0),
* Cesium.Math.toRadians(20.0),
* Cesium.Math.toRadians(-60.0),
* Cesium.Math.toRadians(40.0))
* });
*
* @exception {RuntimeError} Unable to find expected tilesets or bbox attributes in tilemapresource.xml
* @exception {RuntimeError} tilemapresource.xml specifies an unsupported profile attribute
*/
TileMapServiceImageryProvider.fromUrl = async function (url, options) {
//>>includeStart('debug', pragmas.debug);
Check.defined("url", url);
//>>includeEnd('debug');
const resource = Resource.createIfNeeded(url);
resource.appendForwardSlash();
const tmsResource = resource;
const xmlResource = resource.getDerivedResource({
url: "tilemapresource.xml",
});
options = options ?? Frozen.EMPTY_OBJECT;
const metadata = await TileMapServiceImageryProvider._requestMetadata(
options,
tmsResource,
xmlResource,
);
return new TileMapServiceImageryProvider(metadata);
};
Eif (defined(Object.create)) {
TileMapServiceImageryProvider.prototype = Object.create(
UrlTemplateImageryProvider.prototype,
);
TileMapServiceImageryProvider.prototype.constructor =
TileMapServiceImageryProvider;
}
/**
* Mutates the properties of a given rectangle so it does not extend outside of the given tiling scheme's rectangle
* @private
*/
function confineRectangleToTilingScheme(rectangle, tilingScheme) {
if (rectangle.west < tilingScheme.rectangle.west) {
rectangle.west = tilingScheme.rectangle.west;
}
if (rectangle.east > tilingScheme.rectangle.east) {
rectangle.east = tilingScheme.rectangle.east;
}
if (rectangle.south < tilingScheme.rectangle.south) {
rectangle.south = tilingScheme.rectangle.south;
}
if (rectangle.north > tilingScheme.rectangle.north) {
rectangle.north = tilingScheme.rectangle.north;
}
return rectangle;
}
function calculateSafeMinimumDetailLevel(
tilingScheme,
rectangle,
minimumLevel,
) {
// Check the number of tiles at the minimum level. If it's more than four,
// try requesting the lower levels anyway, because starting at the higher minimum
// level will cause too many tiles to be downloaded and rendered.
const swTile = tilingScheme.positionToTileXY(
Rectangle.southwest(rectangle),
minimumLevel,
);
const neTile = tilingScheme.positionToTileXY(
Rectangle.northeast(rectangle),
minimumLevel,
);
const tileCount =
(Math.abs(neTile.x - swTile.x) + 1) * (Math.abs(neTile.y - swTile.y) + 1);
if (tileCount > 4) {
return 0;
}
return minimumLevel;
}
/**
* Parses the results of a successful xml request
* @private
*
* @param {object} xml
* @param {TileMapServiceImageryProvider.ConstructorOptions} options
* @param {Resource} tmsResource
* @param {Resource} xmlResource
* @returns {UrlTemplateImageryProvider.ConstructorOptions}
*/
TileMapServiceImageryProvider._metadataSuccess = function (
xml,
options,
tmsResource,
xmlResource,
provider,
) {
const tileFormatRegex = /tileformat/i;
const tileSetRegex = /tileset/i;
const tileSetsRegex = /tilesets/i;
const bboxRegex = /boundingbox/i;
let format, bbox, tilesets;
const tilesetsList = []; //list of TileSets
// Allowing options properties (already copied to that) to override XML values
// Iterate XML Document nodes for properties
const nodeList = xml.childNodes[0].childNodes;
for (let i = 0; i < nodeList.length; i++) {
if (tileFormatRegex.test(nodeList.item(i).nodeName)) {
format = nodeList.item(i);
} else if (tileSetsRegex.test(nodeList.item(i).nodeName)) {
tilesets = nodeList.item(i); // Node list of TileSets
const tileSetNodes = nodeList.item(i).childNodes;
// Iterate the nodes to find all TileSets
for (let j = 0; j < tileSetNodes.length; j++) {
if (tileSetRegex.test(tileSetNodes.item(j).nodeName)) {
// Add them to tilesets list
tilesetsList.push(tileSetNodes.item(j));
}
}
} else if (bboxRegex.test(nodeList.item(i).nodeName)) {
bbox = nodeList.item(i);
}
}
let message;
if (!defined(tilesets) || !defined(bbox)) {
message = `Unable to find expected tilesets or bbox attributes in ${xmlResource.url}.`;
Iif (defined(provider)) {
TileProviderError.reportError(
undefined,
provider,
provider.errorEvent,
message,
);
}
throw new RuntimeError(message);
}
const fileExtension =
options.fileExtension ?? format.getAttribute("extension");
const tileWidth =
options.tileWidth ?? parseInt(format.getAttribute("width"), 10);
const tileHeight =
options.tileHeight ?? parseInt(format.getAttribute("height"), 10);
let minimumLevel =
options.minimumLevel ?? parseInt(tilesetsList[0].getAttribute("order"), 10);
const maximumLevel =
options.maximumLevel ??
parseInt(tilesetsList[tilesetsList.length - 1].getAttribute("order"), 10);
const tilingSchemeName = tilesets.getAttribute("profile");
let tilingScheme = options.tilingScheme;
Eif (!defined(tilingScheme)) {
if (
tilingSchemeName === "geodetic" ||
tilingSchemeName === "global-geodetic"
) {
tilingScheme = new GeographicTilingScheme({
ellipsoid: options.ellipsoid,
});
} else if (
tilingSchemeName === "mercator" ||
tilingSchemeName === "global-mercator"
) {
tilingScheme = new WebMercatorTilingScheme({
ellipsoid: options.ellipsoid,
});
} else {
message = `${xmlResource.url} specifies an unsupported profile attribute, ${tilingSchemeName}.`;
Iif (defined(provider)) {
TileProviderError.reportError(
undefined,
provider,
provider.errorEvent,
message,
);
}
throw new RuntimeError(message);
}
}
// rectangle handling
let rectangle = Rectangle.clone(options.rectangle);
if (!defined(rectangle)) {
let sw;
let ne;
let swXY;
let neXY;
// In older versions of gdal x and y values were flipped, which is why we check for an option to flip
// the values here as well. Unfortunately there is no way to autodetect whether flipping is needed.
const flipXY = options.flipXY ?? false;
if (flipXY) {
swXY = new Cartesian2(
parseFloat(bbox.getAttribute("miny")),
parseFloat(bbox.getAttribute("minx")),
);
neXY = new Cartesian2(
parseFloat(bbox.getAttribute("maxy")),
parseFloat(bbox.getAttribute("maxx")),
);
} else {
swXY = new Cartesian2(
parseFloat(bbox.getAttribute("minx")),
parseFloat(bbox.getAttribute("miny")),
);
neXY = new Cartesian2(
parseFloat(bbox.getAttribute("maxx")),
parseFloat(bbox.getAttribute("maxy")),
);
}
// Determine based on the profile attribute if this tileset was generated by gdal2tiles.py, which
// uses 'mercator' and 'geodetic' profiles, or by a tool compliant with the TMS standard, which is
// 'global-mercator' and 'global-geodetic' profiles. In the gdal2Tiles case, X and Y are always in
// geodetic degrees.
const isGdal2tiles =
tilingSchemeName === "geodetic" || tilingSchemeName === "mercator";
if (
tilingScheme.projection instanceof GeographicProjection ||
isGdal2tiles
) {
sw = Cartographic.fromDegrees(swXY.x, swXY.y);
ne = Cartographic.fromDegrees(neXY.x, neXY.y);
} else {
const projection = tilingScheme.projection;
sw = projection.unproject(swXY);
ne = projection.unproject(neXY);
}
rectangle = new Rectangle(
sw.longitude,
sw.latitude,
ne.longitude,
ne.latitude,
);
}
// The rectangle must not be outside the bounds allowed by the tiling scheme.
rectangle = confineRectangleToTilingScheme(rectangle, tilingScheme);
// clamp our minimum detail level to something that isn't going to request a ridiculous number of tiles
minimumLevel = calculateSafeMinimumDetailLevel(
tilingScheme,
rectangle,
minimumLevel,
);
const templateResource = tmsResource.getDerivedResource({
url: `{z}/{x}/{reverseY}.${fileExtension}`,
});
return {
url: templateResource,
tilingScheme: tilingScheme,
rectangle: rectangle,
tileWidth: tileWidth,
tileHeight: tileHeight,
minimumLevel: minimumLevel,
maximumLevel: maximumLevel,
tileDiscardPolicy: options.tileDiscardPolicy,
credit: options.credit,
};
};
/**
* Handle xml request failure by providing the default values
* @private
*
* @param {TileMapServiceImageryProvider.ConstructorOptions} options
* @param {Resource} tmsResource
* @returns {UrlTemplateImageryProvider.ConstructorOptions}
*/
TileMapServiceImageryProvider._metadataFailure = function (
options,
tmsResource,
) {
// Can't load XML, still allow options and defaults
const fileExtension = options.fileExtension ?? "png";
const tileWidth = options.tileWidth ?? 256;
const tileHeight = options.tileHeight ?? 256;
const maximumLevel = options.maximumLevel;
const tilingScheme = defined(options.tilingScheme)
? options.tilingScheme
: new WebMercatorTilingScheme({ ellipsoid: options.ellipsoid });
let rectangle = options.rectangle ?? tilingScheme.rectangle;
// The rectangle must not be outside the bounds allowed by the tiling scheme.
rectangle = confineRectangleToTilingScheme(rectangle, tilingScheme);
// make sure we use a safe minimum detail level, so we don't request a ridiculous number of tiles
const minimumLevel = calculateSafeMinimumDetailLevel(
tilingScheme,
rectangle,
options.minimumLevel,
);
const templateResource = tmsResource.getDerivedResource({
url: `{z}/{x}/{reverseY}.${fileExtension}`,
});
return {
url: templateResource,
tilingScheme: tilingScheme,
rectangle: rectangle,
tileWidth: tileWidth,
tileHeight: tileHeight,
minimumLevel: minimumLevel,
maximumLevel: maximumLevel,
tileDiscardPolicy: options.tileDiscardPolicy,
credit: options.credit,
};
};
export default TileMapServiceImageryProvider;
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