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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /*global define*/ | ||
| define([ | ||
| '../Core/Credit', | ||
| '../Core/defaultValue', | ||
| '../Core/DeveloperError', | ||
| '../Core/Rectangle', | ||
| '../Core/WebMercatorTilingScheme', | ||
| './UrlTemplateImageryProvider' | ||
| ], function( | ||
| Credit, | ||
| defaultValue, | ||
| DeveloperError, | ||
| Rectangle, | ||
| WebMercatorTilingScheme, | ||
| UrlTemplateImageryProvider | ||
| ) { | ||
| "use strict"; | ||
|
|
||
| var trailingSlashRegex = /\/$/; | ||
| var defaultCredit = new Credit('MapQuest, Open Street Map and contributors, CC-BY-SA'); | ||
|
|
||
| /** | ||
| * Creates a {@link UrlTemplateImageryProvider} instance that provides tiled imagery hosted by OpenStreetMap | ||
| * or another provider of Slippy tiles. The default url connects to OpenStreetMap's volunteer-run | ||
| * servers, so you must conform to their | ||
| * {@link http://wiki.openstreetmap.org/wiki/Tile_usage_policy|Tile Usage Policy}. | ||
| * | ||
| * @exports createOpenStreetMapImageryProvider | ||
| * | ||
| * @param {Object} [options] Object with the following properties: | ||
| * @param {String} [options.url='//a.tile.openstreetmap.org'] The OpenStreetMap server url. | ||
| * @param {String} [options.fileExtension='png'] The file extension for images on the server. | ||
| * @param {Object} [options.proxy] A proxy to use for requests. This object is expected to have a getURL function which returns the proxied URL. | ||
| * @param {Rectangle} [options.rectangle=Rectangle.MAX_VALUE] The rectangle of the layer. | ||
| * @param {Number} [options.minimumLevel=0] The minimum level-of-detail supported by the imagery provider. | ||
| * @param {Number} [options.maximumLevel] The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit. | ||
| * @param {Ellipsoid} [options.ellipsoid] The ellipsoid. If not specified, the WGS84 ellipsoid is used. | ||
| * @param {Credit|String} [options.credit='MapQuest, Open Street Map and contributors, CC-BY-SA'] A credit for the data source, which is displayed on the canvas. | ||
| * | ||
| * @exception {DeveloperError} The rectangle and minimumLevel indicate that there are more than four tiles at the minimum level. Imagery providers with more than four tiles at the minimum level are not supported. | ||
| * | ||
| * @see ArcGisMapServerImageryProvider | ||
| * @see BingMapsImageryProvider | ||
| * @see GoogleEarthImageryProvider | ||
| * @see SingleTileImageryProvider | ||
| * @see TileMapServiceImageryProvider | ||
| * @see WebMapServiceImageryProvider | ||
| * @see WebMapTileServiceImageryProvider | ||
| * @see UrlTemplateImageryProvider | ||
| * | ||
| * @see {@link http://wiki.openstreetmap.org/wiki/Main_Page|OpenStreetMap Wiki} | ||
| * @see {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing} | ||
| * | ||
| * @example | ||
| * var osm = Cesium.createOpenStreetMapImageryProvider({ | ||
| * url : '//a.tile.openstreetmap.org/' | ||
| * }); | ||
| */ | ||
| var createOpenStreetMapImageryProvider = function createOpenStreetMapImageryProvider(options) { | ||
| options = defaultValue(options, {}); | ||
|
|
||
| var url = defaultValue(options.url, '//a.tile.openstreetmap.org/'); | ||
|
|
||
| if (!trailingSlashRegex.test(url)) { | ||
| url = url + '/'; | ||
| } | ||
|
|
||
| var fileExtension = defaultValue(options.fileExtension, 'png'); | ||
|
|
||
| var tilingScheme = new WebMercatorTilingScheme({ ellipsoid : options.ellipsoid }); | ||
|
|
||
| var tileWidth = 256; | ||
| var tileHeight = 256; | ||
|
|
||
| var minimumLevel = defaultValue(options.minimumLevel, 0); | ||
| var maximumLevel = options.maximumLevel; | ||
|
|
||
| var rectangle = defaultValue(options.rectangle, tilingScheme.rectangle); | ||
|
|
||
| // Check the number of tiles at the minimum level. If it's more than four, | ||
| // throw an exception, because starting at the higher minimum | ||
| // level will cause too many tiles to be downloaded and rendered. | ||
| var swTile = tilingScheme.positionToTileXY(Rectangle.southwest(rectangle), minimumLevel); | ||
| var neTile = tilingScheme.positionToTileXY(Rectangle.northeast(rectangle), minimumLevel); | ||
| var tileCount = (Math.abs(neTile.x - swTile.x) + 1) * (Math.abs(neTile.y - swTile.y) + 1); | ||
| if (tileCount > 4) { | ||
| throw new DeveloperError('The rectangle and minimumLevel indicate that there are ' + tileCount + ' tiles at the minimum level. Imagery providers with more than four tiles at the minimum level are not supported.'); | ||
| } | ||
|
|
||
| var credit = defaultValue(options.credit, defaultCredit); | ||
| if (typeof credit === 'string') { | ||
| credit = new Credit(credit); | ||
| } | ||
|
|
||
| var templateUrl = url + "{z}/{x}/{y}." + fileExtension; | ||
|
|
||
| return new UrlTemplateImageryProvider({ | ||
| url: templateUrl, | ||
| proxy: options.proxy, | ||
| credit: credit, | ||
| tilingScheme: tilingScheme, | ||
| tileWidth: tileWidth, | ||
| tileHeight: tileHeight, | ||
| minimumLevel: minimumLevel, | ||
| maximumLevel: maximumLevel, | ||
| rectangle: rectangle | ||
| }); | ||
| }; | ||
|
|
||
| return createOpenStreetMapImageryProvider; | ||
| }); |
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