/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD licence. * See http://svn.openlayers.org/trunk/openlayers/release-license.txt  * for the full text of the license. *//** * @requires OpenLayers/Layer/Grid.js *  * Class: OpenLayers.Layer.TMS *  * Inherits from: *  - <OpenLayers.Layer.Grid> */OpenLayers.Layer.TMS = OpenLayers.Class(OpenLayers.Layer.Grid, {    /**     * APIProperty: serviceVersion     * {String}     */    serviceVersion: "1.0.0",    /**     * APIProperty: isBaseLayer     * {Boolean}     */    isBaseLayer: true,    /**     * APIProperty: tileOrigin     * {<OpenLayers.Pixel>}     */    tileOrigin: null,    /**     * Constructor: OpenLayers.Layer.TMS     *      * Parameters:     * name - {String}     * url - {String}     * params - {Object}     * options - {Object} Hashtable of extra options to tag onto the layer     */    initialize: function(name, url, options) {        var newArguments = [];        newArguments.push(name, url, {}, options);        OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);    },        /**     * APIMethod:destroy     */    destroy: function() {        // for now, nothing special to do here.         OpenLayers.Layer.Grid.prototype.destroy.apply(this, arguments);      },        /**     * APIMethod: clone     *      * Parameters:     * obj - {Object}     *      * Returns:     * {<OpenLayers.Layer.TMS>} An exact clone of this <OpenLayers.Layer.TMS>     */    clone: function (obj) {                if (obj == null) {            obj = new OpenLayers.Layer.TMS(this.name,                                           this.url,                                           this.options);        }        //get all additions from superclasses        obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);        // copy/set any non-init, non-simple values here        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) {        bounds = this.adjustBounds(bounds);        var res = this.map.getResolution();        var x = Math.round((bounds.left - this.tileOrigin.lon) / (res * this.tileSize.w));        var y = Math.round((bounds.bottom - this.tileOrigin.lat) / (res * this.tileSize.h));        var z = this.map.getZoom();        var path = this.serviceVersion + "/" + this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;         var url = this.url;        if (url instanceof Array) {            url = this.selectUrl(path, url);        }        return url + path;    },    /**     * Method: addTile     * addTile creates a tile, initializes it, and adds it to the layer div.      *      * Parameters:     * bounds - {<OpenLayers.Bounds>}     *      * 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.map.maxExtent.left,                                                this.map.maxExtent.bottom);        }                                           },    CLASS_NAME: "OpenLayers.Layer.TMS"});