TMS.js
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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD licence.
* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
* for the full text of the license. */
/**
* @class
*
* @requires OpenLayers/Layer/Grid.js
*/
OpenLayers.Layer.TMS = OpenLayers.Class.create();
OpenLayers.Layer.TMS.prototype =
OpenLayers.Class.inherit( OpenLayers.Layer.Grid, {
reproject: false,
isBaseLayer: true,
tileOrigin: null,
/**
* @constructor
*
* @param {String} name
* @param {String} url
* @param {Object} params
* @param {Object} options Hashtable of extra options to tag onto the layer
*/
initialize: function(name, url, options) {
var newArguments = new Array();
newArguments.push(name, url, {}, options);
OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
},
/**
*
*/
destroy: function() {
// for now, nothing special to do here.
OpenLayers.Layer.Grid.prototype.destroy.apply(this, arguments);
},
/**
* @param {Object} obj
*
* @returns An exact clone of this OpenLayers.Layer.TMS
* @type 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;
},
/**
* @param {OpenLayers.Bounds} bounds
*
* @returns A string with the layer's url and parameters and also the
* passed-in bounds and appropriate tile size specified as
* parameters
* @type String
*/
getURL: function (bounds) {
var res = this.map.getResolution();
var x = (bounds.left - this.tileOrigin.lon) / (res * this.tileSize.w);
var y = (bounds.bottom - this.tileOrigin.lat) / (res * this.tileSize.h);
var z = this.map.getZoom();
var path = "1.0.0" + "/" + this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
var url = this.url;
if (url instanceof Array) {
url = this.selectUrl(path, url);
}
return url + path;
},
/**
* addTile creates a tile, initializes it, and
* adds it to the layer div.
*
* @param {OpenLayers.Bounds} bounds
*
* @returns The added OpenLayers.Tile.Image
* @type OpenLayers.Tile.Image
*/
addTile:function(bounds,position) {
var url = this.getURL(bounds);
return new OpenLayers.Tile.Image(this, position, bounds,
url, this.tileSize);
},
/** When the layer is added to a map, then we can fetch our origin
* (if we don't have one.)
*
* @param {OpenLayers.Map} 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);
}
},
/** @final @type String */
CLASS_NAME: "OpenLayers.Layer.TMS"
});