314 lines
11 KiB
JavaScript
314 lines
11 KiB
JavaScript
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/**
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* An {@link ImageryProvider} that draws a box around every rendered tile in the tiling scheme, and draws
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* a label inside it indicating the X, Y, Level coordinates of the tile. This is mostly useful for
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* debugging terrain and imagery rendering problems.
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*
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* @alias TileLonlatsImageryProvider
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* @constructor
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*
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* @param {Object} [options] Object with the following properties:
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* @param {TilingScheme} [options.tilingScheme=new GeographicTilingScheme()] The tiling scheme for which to draw tiles.
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* @param {Ellipsoid} [options.ellipsoid] The ellipsoid. If the tilingScheme is specified,
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* this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither
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* parameter is specified, the WGS84 ellipsoid is used.
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* @param {Color} [options.color=Color.YELLOW] The color to draw the tile box and label.
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* @param {Number} [options.tileWidth=256] The width of the tile for level-of-detail selection purposes.
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* @param {Number} [options.tileHeight=256] The height of the tile for level-of-detail selection purposes.
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*/
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var TileLonlatsImageryProvider = function TileLonlatsImageryProvider(options) {
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options = Cesium.defaultValue(options, Cesium.defaultValue.EMPTY_OBJECT);
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this._tilingScheme = Cesium.defined(options.tilingScheme) ? options.tilingScheme : new Cesium.GeographicTilingScheme({ ellipsoid: options.ellipsoid });
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this._color = Cesium.defaultValue(options.color, Cesium.Color.YELLOW);
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this._errorEvent = new Cesium.Event();
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this._tileWidth = Cesium.defaultValue(options.tileWidth, 256);
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this._tileHeight = Cesium.defaultValue(options.tileHeight, 256);
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this._readyPromise = Cesium.when.resolve(true);
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}
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Cesium.defineProperties(TileLonlatsImageryProvider.prototype, {
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/**
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* Gets the proxy used by this provider.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Proxy}
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* @readonly
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*/
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proxy : {
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get : function() {
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return undefined;
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}
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},
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/**
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* Gets the width of each tile, in pixels. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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tileWidth : {
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get : function() {
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return this._tileWidth;
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}
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},
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/**
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* Gets the height of each tile, in pixels. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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tileHeight: {
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get : function() {
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return this._tileHeight;
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}
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},
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/**
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* Gets the maximum level-of-detail that can be requested. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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maximumLevel : {
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get : function() {
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return undefined;
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}
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},
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/**
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* Gets the minimum level-of-detail that can be requested. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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minimumLevel : {
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get : function() {
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return undefined;
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}
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},
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/**
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* Gets the tiling scheme used by this provider. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {TilingScheme}
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* @readonly
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*/
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tilingScheme : {
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get : function() {
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return this._tilingScheme;
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}
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},
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/**
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* Gets the rectangle, in radians, of the imagery provided by this instance. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Rectangle}
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* @readonly
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*/
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rectangle : {
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get : function() {
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return this._tilingScheme.rectangle;
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}
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},
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/**
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* Gets the tile discard policy. If not undefined, the discard policy is responsible
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* for filtering out "missing" tiles via its shouldDiscardImage function. If this function
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* returns undefined, no tiles are filtered. This function should
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* not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {TileDiscardPolicy}
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* @readonly
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*/
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tileDiscardPolicy : {
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get : function() {
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return undefined;
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}
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},
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/**
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* Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
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* to the event, you will be notified of the error and can potentially recover from it. Event listeners
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* are passed an instance of {@link TileProviderError}.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Event}
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* @readonly
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*/
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errorEvent : {
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get : function() {
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return this._errorEvent;
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}
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},
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/**
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* Gets a value indicating whether or not the provider is ready for use.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Boolean}
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* @readonly
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*/
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ready : {
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get : function() {
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return true;
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}
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},
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/**
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* Gets a promise that resolves to true when the provider is ready for use.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Promise.<Boolean>}
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* @readonly
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*/
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readyPromise : {
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get : function() {
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return this._readyPromise;
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}
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},
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/**
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* Gets the credit to display when this imagery provider is active. Typically this is used to credit
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* the source of the imagery. This function should not be called before {@link TileCoordinatesImageryProvider#ready} returns true.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Credit}
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* @readonly
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*/
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credit : {
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get : function() {
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return undefined;
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}
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},
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/**
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* Gets a value indicating whether or not the images provided by this imagery provider
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* include an alpha channel. If this property is false, an alpha channel, if present, will
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* be ignored. If this property is true, any images without an alpha channel will be treated
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* as if their alpha is 1.0 everywhere. Setting this property to false reduces memory usage
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* and texture upload time.
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* @memberof TileCoordinatesImageryProvider.prototype
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* @type {Boolean}
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* @readonly
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*/
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hasAlphaChannel : {
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get : function() {
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return true;
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}
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}
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});
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/**
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* Gets the credits to be displayed when a given tile is displayed.
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*
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* @param {Number} x The tile X coordinate.
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* @param {Number} y The tile Y coordinate.
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* @param {Number} level The tile level;
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* @returns {Credit[]} The credits to be displayed when the tile is displayed.
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*
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* @exception {DeveloperError} <code>getTileCredits</code> must not be called before the imagery provider is ready.
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*/
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TileLonlatsImageryProvider.prototype.getTileCredits = function (x, y, level) {
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return undefined;
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};
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/**
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* Requests the image for a given tile. This function should
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* not be called before {@link TileLonlatsImageryProvider#ready} returns true.
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*
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* @param {Number} x The tile X coordinate.
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* @param {Number} y The tile Y coordinate.
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* @param {Number} level The tile level.
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* @param {Request} [request] The request object. Intended for internal use only.
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* @returns {Promise.<Image|Canvas>|undefined} A promise for the image that will resolve when the image is available, or
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* undefined if there are too many active requests to the server, and the request
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* should be retried later. The resolved image may be either an
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* Image or a Canvas DOM object.
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*/
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TileLonlatsImageryProvider.prototype.requestImage = function (x, y, level, request) {
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var canvas = document.createElement('canvas');
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canvas.width = 256;
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canvas.height = 256;
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var context = canvas.getContext('2d');
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var cssColor = this._color.toCssColorString();
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context.strokeStyle = cssColor;
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context.lineWidth = 2;
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context.strokeRect(1, 1, 255, 255);
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/*
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可以使用GeographicTilingScheme的tileXYToNativeRectangle接口获取对应关系，不需要自己算！
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*/
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var interval = 180.0 / Math.pow(2, level);
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var lon = (x + 0.5) * interval-180;
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var lat = 90 - (y + 0.5) * interval;
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//var label = 'L-' + level + 'X-' + x + 'Y-' + y;
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var labelLevel = '';
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var labelLon = '';
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var labelLat = '';
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if (lon > 0) {
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if (lat > 0) {
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//label = 'L' + level + 'E' + lon + 'N' + lat;
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labelLevel = 'L' + level;
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labelLon = 'E' + lon;
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labelLat = 'N' + lat;
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} else {
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//label = 'L' + level + 'E' + lon + 'S' + (-lat);
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labelLevel = 'L' + level;
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labelLon = 'E' + lon;
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labelLat = 'N' + (-lat);
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}
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} else {
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if (lat > 0) {
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//label = 'L' + level + 'W' + (-lon) + 'N' + lat;
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labelLevel = 'L' + level;
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labelLon = 'E' + (-lon);
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labelLat = 'N' + lat;
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} else {
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//label = 'L' + level + 'W' + (-lon) + 'S' + (-lat);
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labelLevel = 'L' + level;
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labelLon = 'E' + (-lon);
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labelLat = 'N' + (-lat);
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}
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}
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context.textAlign = 'center';
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context.fillStyle = cssColor;
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if (level > 10) {
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context.font = 'bold 16px Arial';
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context.fillText(labelLevel, 124, 100);
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context.fillText(labelLon, 124, 124);
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context.fillText(labelLat, 124, 148);
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} else {
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context.font = 'bold 25px Arial';
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context.fillText(labelLevel, 124, 94);
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context.fillText(labelLon, 124, 124);
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context.fillText(labelLat, 124, 154);
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}
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//context.textAlign = 'center';
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//context.fillStyle = 'black';//绘制阴影效果
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//context.fillText(label, 127, 127);
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//context.fillStyle = cssColor;
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//context.fillText(label, 124, 24);
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return canvas;
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};
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/**
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* Picking features is not currently supported by this imagery provider, so this function simply returns
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* undefined.
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*
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* @param {Number} x The tile X coordinate.
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* @param {Number} y The tile Y coordinate.
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* @param {Number} level The tile level.
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* @param {Number} longitude The longitude at which to pick features.
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* @param {Number} latitude The latitude at which to pick features.
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* @return {Promise.<ImageryLayerFeatureInfo[]>|undefined} A promise for the picked features that will resolve when the asynchronous
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* picking completes. The resolved value is an array of {@link ImageryLayerFeatureInfo}
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* instances. The array may be empty if no features are found at the given location.
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* It may also be undefined if picking is not supported.
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*/
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TileLonlatsImageryProvider.prototype.pickFeatures = function (x, y, level, longitude, latitude) {
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return undefined;
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};
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