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Viewing file:     XYZ.js (6.14 KB)      -rw-rw-rw-

/* 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"
});