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Viewing file: XYZ.js (6.14 KB) -rw-rw-rw- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for * full list of contributors). Published under the Clear BSD license. * See http://svn.openlayers.org/trunk/openlayers/license.txt for the * full text of the license. */ /** * @requires OpenLayers/Layer/Grid.js * @requires OpenLayers/Tile/Image.js */ /** * Class: OpenLayers.Layer.XYZ * The XYZ class is designed to make it easier for people who have tiles * arranged by a standard XYZ grid. * * Inherits from: * - <OpenLayers.Layer.Grid> */ OpenLayers.Layer.XYZ = OpenLayers.Class(OpenLayers.Layer.Grid, { /** * APIProperty: isBaseLayer * Default is true, as this is designed to be a base tile source. */ isBaseLayer: true, /** * APIProperty: sphericalMecator * Whether the tile extents should be set to the defaults for * spherical mercator. Useful for things like OpenStreetMap. * Default is false, except for the OSM subclass. */ sphericalMercator: false, /** * APIProperty: zoomOffset * {Number} If your cache has more zoom levels than you want to provide * access to with this layer, supply a zoomOffset. This zoom offset * is added to the current map zoom level to determine the level * for a requested tile. For example, if you supply a zoomOffset * of 3, when the map is at the zoom 0, tiles will be requested from * level 3 of your cache. Default is 0 (assumes cache level and map * zoom are equivalent). */ zoomOffset: 0, /** * Constructor: OpenLayers.Layer.XYZ * * Parameters: * name - {String} * url - {String} * options - {Object} Hashtable of extra options to tag onto the layer */ initialize: function(name, url, options) { if (options && options.sphericalMercator || this.sphericalMercator) { options = OpenLayers.Util.extend({ maxExtent: new OpenLayers.Bounds( -128 * 156543.0339, -128 * 156543.0339, 128 * 156543.0339, 128 * 156543.0339 ), maxResolution: 156543.0339, numZoomLevels: 19, units: "m", projection: "EPSG:900913" }, options); } url = url || this.url; name = name || this.name; var newArguments = [name, url, {}, options]; OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments); }, /** * APIMethod: clone * Create a clone of this layer * * Parameters: * obj - {Object} Is this ever used? * * Returns: * {<OpenLayers.Layer.XYZ>} An exact clone of this OpenLayers.Layer.XYZ */ clone: function (obj) { if (obj == null) { obj = new OpenLayers.Layer.XYZ(this.name, this.url, this.getOptions()); } //get all additions from superclasses obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]); return obj; }, /** * Method: getUrl * * Parameters: * bounds - {<OpenLayers.Bounds>} * * Returns: * {String} A string with the layer's url and parameters and also the * passed-in bounds and appropriate tile size specified as * parameters */ getURL: function (bounds) { var res = this.map.getResolution(); var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w)); var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h)); var z = this.map.getZoom() + this.zoomOffset; var url = this.url; var s = '' + x + y + z; if (url instanceof Array) { url = this.selectUrl(s, url); } var path = OpenLayers.String.format(url, {'x': x, 'y': y, 'z': z}); return path; }, /** * Method: addTile * addTile creates a tile, initializes it, and adds it to the layer div. * * Parameters: * bounds - {<OpenLayers.Bounds>} * position - {<OpenLayers.Pixel>} * * Returns: * {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image */ addTile:function(bounds,position) { return new OpenLayers.Tile.Image(this, position, bounds, null, this.tileSize); }, /* APIMethod: setMap * When the layer is added to a map, then we can fetch our origin * (if we don't have one.) * * Parameters: * map - {<OpenLayers.Map>} */ setMap: function(map) { OpenLayers.Layer.Grid.prototype.setMap.apply(this, arguments); if (!this.tileOrigin) { this.tileOrigin = new OpenLayers.LonLat(this.maxExtent.left, this.maxExtent.bottom); } }, CLASS_NAME: "OpenLayers.Layer.XYZ" }); /** * Class: OpenLayers.Layer.OSM * A class to access OpenStreetMap tiles. By default, uses the OpenStreetMap * hosted tile.openstreetmap.org 'Mapnik' tileset. If you wish to use * tiles@home / osmarender layer instead, you can pass a layer like: * * (code) * new OpenLayers.Layer.OSM("t@h", * "http://tah.openstreetmap.org/Tiles/tile/${z}/${x}/${y}.png"); * (end) * * This layer defaults to Spherical Mercator. * * Inherits from: * - <OpenLayers.Layer.XYZ> */ OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.XYZ, { name: "OpenStreetMap", attribution: "Data CC-By-SA by <a href='http://openstreetmap.org/'>OpenStreetMap</a>", sphericalMercator: true, url: 'http://tile.openstreetmap.org/${z}/${x}/${y}.png', clone: function(obj) { if (obj == null) { obj = new OpenLayers.Layer.OSM( this.name, this.url, this.getOptions()); } obj = OpenLayers.Layer.XYZ.prototype.clone.apply(this, [obj]); return obj; }, CLASS_NAME: "OpenLayers.Layer.OSM" }); |
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