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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | 422x 422x 422x 422x 422x 422x 1x 3x 958x 4151x 3058x 1394x 1x 1x 664x 664x 664x 1x 5865x 1x 879x 1x | 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 HeightmapTerrainData from "./HeightmapTerrainData.js";
import TerrainProvider from "./TerrainProvider.js";
/**
* A very simple {@link TerrainProvider} that produces geometry by tessellating an ellipsoidal
* surface.
*
* @alias EllipsoidTerrainProvider
* @constructor
*
* @param {object} [options] Object with the following properties:
* @param {TilingScheme} [options.tilingScheme] The tiling scheme specifying how the ellipsoidal
* surface is broken into tiles. If this parameter is not provided, a {@link GeographicTilingScheme}
* is used.
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.default] 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 default ellipsoid is used.
*
* @see TerrainProvider
*/
function EllipsoidTerrainProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
this._tilingScheme = options.tilingScheme;
Eif (!defined(this._tilingScheme)) {
this._tilingScheme = new GeographicTilingScheme({
ellipsoid: options.ellipsoid ?? Ellipsoid.default,
});
}
// Note: the 64 below does NOT need to match the actual vertex dimensions, because
// the ellipsoid is significantly smoother than actual terrain.
this._levelZeroMaximumGeometricError =
TerrainProvider.getEstimatedLevelZeroGeometricErrorForAHeightmap(
this._tilingScheme.ellipsoid,
64,
this._tilingScheme.getNumberOfXTilesAtLevel(0),
);
this._errorEvent = new Event();
}
Object.defineProperties(EllipsoidTerrainProvider.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 EllipsoidTerrainProvider.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 EllipsoidTerrainProvider.prototype
* @type {Credit}
* @readonly
*/
credit: {
get: function () {
return undefined;
},
},
/**
* Gets the tiling scheme used by this provider.
* @memberof EllipsoidTerrainProvider.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 EllipsoidTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasWaterMask: {
get: function () {
return false;
},
},
/**
* Gets a value indicating whether or not the requested tiles include vertex normals.
* @memberof EllipsoidTerrainProvider.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 EllipsoidTerrainProvider.prototype
* @type {TileAvailability|undefined}
* @readonly
*/
availability: {
get: function () {
return undefined;
},
},
});
/**
* 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.
*/
EllipsoidTerrainProvider.prototype.requestTileGeometry = function (
x,
y,
level,
request,
) {
const width = 16;
const height = 16;
return Promise.resolve(
new HeightmapTerrainData({
buffer: new Uint8Array(width * height),
width: width,
height: height,
}),
);
};
/**
* 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.
*/
EllipsoidTerrainProvider.prototype.getLevelMaximumGeometricError = function (
level,
) {
return this._levelZeroMaximumGeometricError / (1 << level);
};
/**
* 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.
*/
EllipsoidTerrainProvider.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} This provider does not support loading availability.
*/
EllipsoidTerrainProvider.prototype.loadTileDataAvailability = function (
x,
y,
level,
) {
return undefined;
};
export default EllipsoidTerrainProvider;
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