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import Credit from "./Credit.js";
import Frozen from "./Frozen.js";
import defined from "./defined.js";
import Ellipsoid from "./Ellipsoid.js";
import Event from "./Event.js";
import GeographicTilingScheme from "./GeographicTilingScheme.js";
import getImagePixels from "./getImagePixels.js";
import HeightmapTerrainData from "./HeightmapTerrainData.js";
import CesiumMath from "./Math.js";
import Rectangle from "./Rectangle.js";
import Resource from "./Resource.js";
import RuntimeError from "./RuntimeError.js";
import TerrainProvider from "./TerrainProvider.js";
import TileProviderError from "./TileProviderError.js";
function DataRectangle(rectangle, maxLevel) {
this.rectangle = rectangle;
this.maxLevel = maxLevel;
}
/**
* @typedef {object} VRTheWorldTerrainProvider.ConstructorOptions
*
* Initialization options for the VRTheWorldTerrainProvider constructor
*
* @property {Ellipsoid} [ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @property {Credit|string} [credit] A credit for the data source, which is displayed on the canvas.
*/
/**
* Used to track creation details while fetching initial metadata
*
* @constructor
* @private
*
* @param {VRTheWorldTerrainProvider.ConstructorOptions} options An object describing initialization options
*/
function TerrainProviderBuilder(options) {
this.ellipsoid = options.ellipsoid ?? Ellipsoid.default;
this.tilingScheme = undefined;
this.heightmapWidth = undefined;
this.heightmapHeight = undefined;
this.levelZeroMaximumGeometricError = undefined;
this.rectangles = [];
}
TerrainProviderBuilder.prototype.build = function (provider) {
provider._tilingScheme = this.tilingScheme;
provider._heightmapWidth = this.heightmapWidth;
provider._heightmapHeight = this.heightmapHeight;
provider._levelZeroMaximumGeometricError =
this.levelZeroMaximumGeometricError;
provider._rectangles = this.rectangles;
};
function metadataSuccess(terrainProviderBuilder, xml) {
const srs = xml.getElementsByTagName("SRS")[0].textContent;
if (srs === "EPSG:4326") {
terrainProviderBuilder.tilingScheme = new GeographicTilingScheme({
ellipsoid: terrainProviderBuilder.ellipsoid,
});
} else {
throw new RuntimeError(`SRS ${srs} is not supported`);
}
const tileFormat = xml.getElementsByTagName("TileFormat")[0];
terrainProviderBuilder.heightmapWidth = parseInt(
tileFormat.getAttribute("width"),
10,
);
terrainProviderBuilder.heightmapHeight = parseInt(
tileFormat.getAttribute("height"),
10,
);
terrainProviderBuilder.levelZeroMaximumGeometricError =
TerrainProvider.getEstimatedLevelZeroGeometricErrorForAHeightmap(
terrainProviderBuilder.ellipsoid,
Math.min(
terrainProviderBuilder.heightmapWidth,
terrainProviderBuilder.heightmapHeight,
),
terrainProviderBuilder.tilingScheme.getNumberOfXTilesAtLevel(0),
);
const dataRectangles = xml.getElementsByTagName("DataExtent");
for (let i = 0; i < dataRectangles.length; ++i) {
const dataRectangle = dataRectangles[i];
const west = CesiumMath.toRadians(
parseFloat(dataRectangle.getAttribute("minx")),
);
const south = CesiumMath.toRadians(
parseFloat(dataRectangle.getAttribute("miny")),
);
const east = CesiumMath.toRadians(
parseFloat(dataRectangle.getAttribute("maxx")),
);
const north = CesiumMath.toRadians(
parseFloat(dataRectangle.getAttribute("maxy")),
);
const maxLevel = parseInt(dataRectangle.getAttribute("maxlevel"), 10);
terrainProviderBuilder.rectangles.push(
new DataRectangle(new Rectangle(west, south, east, north), maxLevel),
);
}
}
function metadataFailure(resource, error, provider) {
let message = `An error occurred while accessing ${resource.url}`;
Eif (defined(error) && defined(error.message)) {
message = `${message}: ${error.message}`;
}
TileProviderError.reportError(
undefined,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
async function requestMetadata(terrainProviderBuilder, resource, provider) {
try {
const xml = await resource.fetchXML();
metadataSuccess(terrainProviderBuilder, xml);
} catch (error) {
metadataFailure(resource, error, provider);
}
}
/**
* <div class="notice">
* To construct a VRTheWorldTerrainProvider, call {@link VRTheWorldTerrainProvider.fromUrl}. Do not call the constructor directly.
* </div>
*
* A {@link TerrainProvider} that produces terrain geometry by tessellating height maps
* retrieved from a {@link http://vr-theworld.com/|VT MÄK VR-TheWorld server}.
*
* @alias VRTheWorldTerrainProvider
* @constructor
*
* @param {VRTheWorldTerrainProvider.ConstructorOptions} [options] An object describing initialization options.
*
* @example
* const terrainProvider = await Cesium.VRTheWorldTerrainProvider.fromUrl(
* "https://www.vr-theworld.com/vr-theworld/tiles1.0.0/73/"
* );
* viewer.terrainProvider = terrainProvider;
*
* @see TerrainProvider
*/
function VRTheWorldTerrainProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
this._errorEvent = new Event();
this._terrainDataStructure = {
heightScale: 1.0 / 1000.0,
heightOffset: -1000.0,
elementsPerHeight: 3,
stride: 4,
elementMultiplier: 256.0,
isBigEndian: true,
lowestEncodedHeight: 0,
highestEncodedHeight: 256 * 256 * 256 - 1,
};
let credit = options.credit;
if (typeof credit === "string") {
credit = new Credit(credit);
}
this._credit = credit;
this._tilingScheme = undefined;
this._rectangles = [];
}
Object.defineProperties(VRTheWorldTerrainProvider.prototype, {
/**
* Gets an event that is raised when the terrain 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 VRTheWorldTerrainProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent: {
get: function () {
return this._errorEvent;
},
},
/**
* Gets the credit to display when this terrain provider is active. Typically this is used to credit
* the source of the terrain.
* @memberof VRTheWorldTerrainProvider.prototype
* @type {Credit}
* @readonly
*/
credit: {
get: function () {
return this._credit;
},
},
/**
* Gets the tiling scheme used by this provider.
* @memberof VRTheWorldTerrainProvider.prototype
* @type {GeographicTilingScheme}
* @readonly
*/
tilingScheme: {
get: function () {
return this._tilingScheme;
},
},
/**
* Gets a value indicating whether or not the provider includes a water mask. The water mask
* indicates which areas of the globe are water rather than land, so they can be rendered
* as a reflective surface with animated waves.
* @memberof VRTheWorldTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasWaterMask: {
get: function () {
return false;
},
},
/**
* Gets a value indicating whether or not the requested tiles include vertex normals.
* @memberof VRTheWorldTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasVertexNormals: {
get: function () {
return false;
},
},
/**
* Gets an object that can be used to determine availability of terrain from this provider, such as
* at points and in rectangles. This property may be undefined if availability
* information is not available.
* @memberof VRTheWorldTerrainProvider.prototype
* @type {TileAvailability|undefined}
* @readonly
*/
availability: {
get: function () {
return undefined;
},
},
});
/**
* Creates a {@link TerrainProvider} that produces terrain geometry by tessellating height maps
* retrieved from a {@link http://vr-theworld.com/|VT MÄK VR-TheWorld server}.
*
* @param {Resource|string} url The URL of the VR-TheWorld TileMap.
* @param {VRTheWorldTerrainProvider.ConstructorOptions} [options] An object describing initialization options.
* @returns {Promise<VRTheWorldTerrainProvider>}
*
* @example
* const terrainProvider = await Cesium.VRTheWorldTerrainProvider.fromUrl(
* "https://www.vr-theworld.com/vr-theworld/tiles1.0.0/73/"
* );
* viewer.terrainProvider = terrainProvider;
*
* @exception {RuntimeError} metadata specifies and unknown SRS
*/
VRTheWorldTerrainProvider.fromUrl = async function (url, options) {
//>>includeStart('debug', pragmas.debug);
Check.defined("url", url);
//>>includeEnd('debug');
options = options ?? Frozen.EMPTY_OBJECT;
const terrainProviderBuilder = new TerrainProviderBuilder(options);
const resource = Resource.createIfNeeded(url);
await requestMetadata(terrainProviderBuilder, resource);
const provider = new VRTheWorldTerrainProvider(options);
terrainProviderBuilder.build(provider);
provider._resource = resource;
return provider;
};
/**
* Requests the geometry for a given tile. The result includes terrain
* data and indicates that all child tiles are available.
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @param {Request} [request] The request object. Intended for internal use only.
* @returns {Promise<TerrainData>|undefined} A promise for the requested geometry. If this method
* returns undefined instead of a promise, it is an indication that too many requests are already
* pending and the request will be retried later.
*/
VRTheWorldTerrainProvider.prototype.requestTileGeometry = function (
x,
y,
level,
request,
) {
const yTiles = this._tilingScheme.getNumberOfYTilesAtLevel(level);
const resource = this._resource.getDerivedResource({
url: `${level}/${x}/${yTiles - y - 1}.tif`,
queryParameters: {
cesium: true,
},
request: request,
});
const promise = resource.fetchImage({
preferImageBitmap: true,
});
if (!defined(promise)) {
return undefined;
}
const that = this;
return Promise.resolve(promise).then(function (image) {
return new HeightmapTerrainData({
buffer: getImagePixels(image),
width: that._heightmapWidth,
height: that._heightmapHeight,
childTileMask: getChildMask(that, x, y, level),
structure: that._terrainDataStructure,
});
});
};
/**
* Gets the maximum geometric error allowed in a tile at a given level.
*
* @param {number} level The tile level for which to get the maximum geometric error.
* @returns {number} The maximum geometric error.
*/
VRTheWorldTerrainProvider.prototype.getLevelMaximumGeometricError = function (
level,
) {
return this._levelZeroMaximumGeometricError / (1 << level);
};
const rectangleScratch = new Rectangle();
function getChildMask(provider, x, y, level) {
const tilingScheme = provider._tilingScheme;
const rectangles = provider._rectangles;
const parentRectangle = tilingScheme.tileXYToRectangle(x, y, level);
let childMask = 0;
for (let i = 0; i < rectangles.length && childMask !== 15; ++i) {
const rectangle = rectangles[i];
Iif (rectangle.maxLevel <= level) {
continue;
}
const testRectangle = rectangle.rectangle;
const intersection = Rectangle.intersection(
testRectangle,
parentRectangle,
rectangleScratch,
);
Eif (defined(intersection)) {
// Parent tile is inside this rectangle, so at least one child is, too.
Eif (
isTileInRectangle(tilingScheme, testRectangle, x * 2, y * 2, level + 1)
) {
childMask |= 4; // northwest
}
Eif (
isTileInRectangle(
tilingScheme,
testRectangle,
x * 2 + 1,
y * 2,
level + 1,
)
) {
childMask |= 8; // northeast
}
Eif (
isTileInRectangle(
tilingScheme,
testRectangle,
x * 2,
y * 2 + 1,
level + 1,
)
) {
childMask |= 1; // southwest
}
Eif (
isTileInRectangle(
tilingScheme,
testRectangle,
x * 2 + 1,
y * 2 + 1,
level + 1,
)
) {
childMask |= 2; // southeast
}
}
}
return childMask;
}
function isTileInRectangle(tilingScheme, rectangle, x, y, level) {
const tileRectangle = tilingScheme.tileXYToRectangle(x, y, level);
return defined(
Rectangle.intersection(tileRectangle, rectangle, rectangleScratch),
);
}
/**
* Determines whether data for a tile is available to be loaded.
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @returns {boolean|undefined} Undefined if not supported, otherwise true or false.
*/
VRTheWorldTerrainProvider.prototype.getTileDataAvailable = function (
x,
y,
level,
) {
return undefined;
};
/**
* Makes sure we load availability data for a tile
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @returns {undefined|Promise<void>} Undefined if nothing need to be loaded or a Promise that resolves when all required tiles are loaded
*/
VRTheWorldTerrainProvider.prototype.loadTileDataAvailability = function (
x,
y,
level,
) {
return undefined;
};
export default VRTheWorldTerrainProvider;
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