-/**
- * @requires OpenLayers/Layer/TMS.js
- *
- * Class: OpenLayers.Layer.OSM
- *
- * Inherits from:
- * - <OpenLayers.Layer.TMS>
- */
-OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.TMS, {
- /**
- * Constructor: OpenLayers.Layer.OSM
- *
- * Parameters:
- * name - {String}
- * url - {String}
- * options - {Object} Hashtable of extra options to tag onto the layer
- */
- initialize: function(name, url, options) {
- options = OpenLayers.Util.extend({
- attribution: "Data by <a href='http://openstreetmap.org/'>OpenStreetMap</a>",
- maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
- maxResolution: 156543.0339,
- units: "m",
- projection: "EPSG:900913",
- transitionEffect: "resize"
- }, options);
- var newArguments = [name, url, options];
- OpenLayers.Layer.TMS.prototype.initialize.apply(this, newArguments);
- },
-
- /**
- * 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();
- var limit = Math.pow(2, z);
-
- if (y < 0 || y >= limit)
- {
- return OpenLayers.Util.OSM.MISSING_TILE_URL;
- }
- else
- {
- x = ((x % limit) + limit) % limit;
-
- var url = this.url;
- var path = z + "/" + x + "/" + y + ".png";
-
- if (url instanceof Array)
- {
- url = this.selectUrl(path, url);
- }
-
- return url + path;
- }
- },
-
- CLASS_NAME: "OpenLayers.Layer.OSM"
-});
-