4 OpenLayers.Util.OSM = {};
7 * Constant: MISSING_TILE_URL
8 * {String} URL of image to display for missing tiles
10 OpenLayers.Util.OSM.MISSING_TILE_URL = "http://openstreetmap.org/openlayers/img/404.png";
13 * Property: originalOnImageLoadError
14 * {Function} Original onImageLoadError function.
16 OpenLayers.Util.OSM.originalOnImageLoadError = OpenLayers.Util.onImageLoadError;
19 * Function: onImageLoadError
21 OpenLayers.Util.onImageLoadError = function() {
22 if (this.src.match(/^http:\/\/[abc]\.[a-z]+\.openstreetmap\.org/)) {
23 this.src = OpenLayers.Util.OSM.MISSING_TILE_URL;
25 OpenLayers.Util.OSM.originalOnImageLoadError;
30 * @requires OpenLayers/Layer/TMS.js
32 * Class: OpenLayers.Layer.OSM
35 * - <OpenLayers.Layer.TMS>
37 OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.TMS, {
39 * Constructor: OpenLayers.Layer.OSM
44 * options - {Object} Hashtable of extra options to tag onto the layer
46 initialize: function(name, url, options) {
47 options = OpenLayers.Util.extend(options, {
48 attribution: "Data by <a href='http://openstreetmap.org/'>OpenStreetMap</a>",
49 maxExtent: new OpenLayers.Bounds(-20037508,-20037508,20037508,20037508),
50 maxResolution: 156543,
52 projection: "EPSG:41001"
54 OpenLayers.Layer.TMS.prototype.initialize.apply(this, arguments);
61 * bounds - {<OpenLayers.Bounds>}
64 * {String} A string with the layer's url and parameters and also the
65 * passed-in bounds and appropriate tile size specified as
68 getURL: function (bounds) {
69 var res = this.map.getResolution();
70 var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
71 var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
72 var z = this.map.getZoom();
73 var limit = Math.pow(2, z);
75 if (y < 0 || y >= limit)
77 return OpenLayers.Util.OSM.MISSING_TILE_URL;
81 x = ((x % limit) + limit) % limit;
84 var path = z + "/" + x + "/" + y + ".png";
86 if (url instanceof Array)
88 url = this.selectUrl(path, url);
95 CLASS_NAME: "OpenLayers.Layer.OSM"
99 * Class: OpenLayers.Layer.OSM.Mapnik
102 * - <OpenLayers.Layer.OSM>
104 OpenLayers.Layer.OSM.Mapnik = OpenLayers.Class(OpenLayers.Layer.OSM, {
106 * Constructor: OpenLayers.Layer.OSM.Mapnik
110 * options - {Object} Hashtable of extra options to tag onto the layer
112 initialize: function(name, options) {
114 "http://a.tile.openstreetmap.org/",
115 "http://b.tile.openstreetmap.org/",
116 "http://c.tile.openstreetmap.org/"
118 options = OpenLayers.Util.extend(options, { numZoomLevels: 19 });
119 var newArguments = [name, url, options];
120 OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
123 CLASS_NAME: "OpenLayers.Layer.OSM.Mapnik"
127 * Class: OpenLayers.Layer.OSM.Osmarender
130 * - <OpenLayers.Layer.OSM>
132 OpenLayers.Layer.OSM.Osmarender = OpenLayers.Class(OpenLayers.Layer.OSM, {
134 * Constructor: OpenLayers.Layer.OSM.Osmarender
138 * options - {Object} Hashtable of extra options to tag onto the layer
140 initialize: function(name, options) {
142 "http://a.tah.openstreetmap.org/Tiles/tile.php/",
143 "http://b.tah.openstreetmap.org/Tiles/tile.php/",
144 "http://c.tah.openstreetmap.org/Tiles/tile.php/"
146 options = OpenLayers.Util.extend(options, { numZoomLevels: 18 });
147 var newArguments = [name, url, options];
148 OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
151 CLASS_NAME: "OpenLayers.Layer.OSM.Osmarender"