public/openlayers/OpenStreetMap.js

   1 /**
   2  * Namespace: Util.OSM
   3  */
   4 OpenLayers.Util.OSM = {};
   5
   6 /**
   7  * Constant: MISSING_TILE_URL
   8  * {String} URL of image to display for missing tiles
   9  */
  10 OpenLayers.Util.OSM.MISSING_TILE_URL = "http://openstreetmap.org/openlayers/img/404.png";
  11
  12 /**
  13  * Property: originalOnImageLoadError
  14  * {Function} Original onImageLoadError function.
  15  */
  16 OpenLayers.Util.OSM.originalOnImageLoadError = OpenLayers.Util.onImageLoadError;
  17
  18 /**
  19  * Function: onImageLoadError
  20  */
  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;
  24     } else if (this.src.match(/^http:\/\/[def]\.tah\.openstreetmap\.org\//)) {
  25         // do nothing - this layer is transparent
  26     } else {
  27         OpenLayers.Util.OSM.originalOnImageLoadError;
  28     }
  29 };
  30
  31 /**
  32  * @requires OpenLayers/Layer/TMS.js
  33  *
  34  * Class: OpenLayers.Layer.OSM
  35  *
  36  * Inherits from:
  37  *  - <OpenLayers.Layer.TMS>
  38  */
  39 OpenLayers.Layer.OSM = OpenLayers.Class(OpenLayers.Layer.TMS, {
  40     /**
  41      * Constructor: OpenLayers.Layer.OSM
  42      *
  43      * Parameters:
  44      * name - {String}
  45      * url - {String}
  46      * options - {Object} Hashtable of extra options to tag onto the layer
  47      */
  48     initialize: function(name, url, options) {
  49         options = OpenLayers.Util.extend({
  50             attribution: "Data by <a href='http://openstreetmap.org/'>OpenStreetMap</a>",
  51             maxExtent: new OpenLayers.Bounds(-20037508,-20037508,20037508,20037508),
  52             maxResolution: 156543,
  53             units: "m",
  54             projection: "EPSG:41001"
  55         }, options);
  56         var newArguments = [name, url, options];
  57         OpenLayers.Layer.TMS.prototype.initialize.apply(this, newArguments);
  58     },
  59
  60     /**
  61      * Method: getUrl
  62      *
  63      * Parameters:
  64      * bounds - {<OpenLayers.Bounds>}
  65      *
  66      * Returns:
  67      * {String} A string with the layer's url and parameters and also the
  68      *          passed-in bounds and appropriate tile size specified as
  69      *          parameters
  70      */
  71     getURL: function (bounds) {
  72         var res = this.map.getResolution();
  73         var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
  74         var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
  75         var z = this.map.getZoom();
  76         var limit = Math.pow(2, z);
  77
  78         if (y < 0 || y >= limit)
  79         {
  80             return OpenLayers.Util.OSM.MISSING_TILE_URL;
  81         }
  82         else
  83         {
  84             x = ((x % limit) + limit) % limit;
  85
  86             var url = this.url;
  87             var path = z + "/" + x + "/" + y + ".png";
  88
  89             if (url instanceof Array)
  90             {
  91                 url = this.selectUrl(path, url);
  92             }
  93
  94             return url + path;
  95         }
  96     },
  97
  98     CLASS_NAME: "OpenLayers.Layer.OSM"
  99 });
 100
 101 /**
 102  * Class: OpenLayers.Layer.OSM.Mapnik
 103  *
 104  * Inherits from:
 105  *  - <OpenLayers.Layer.OSM>
 106  */
 107 OpenLayers.Layer.OSM.Mapnik = OpenLayers.Class(OpenLayers.Layer.OSM, {
 108     /**
 109      * Constructor: OpenLayers.Layer.OSM.Mapnik
 110      *
 111      * Parameters:
 112      * name - {String}
 113      * options - {Object} Hashtable of extra options to tag onto the layer
 114      */
 115     initialize: function(name, options) {
 116         var url = [
 117             "http://a.tile.openstreetmap.org/",
 118             "http://b.tile.openstreetmap.org/",
 119             "http://c.tile.openstreetmap.org/"
 120         ];
 121         options = OpenLayers.Util.extend({ numZoomLevels: 19 }, options);
 122         var newArguments = [name, url, options];
 123         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 124     },
 125
 126     CLASS_NAME: "OpenLayers.Layer.OSM.Mapnik"
 127 });
 128
 129 /**
 130  * Class: OpenLayers.Layer.OSM.Osmarender
 131  *
 132  * Inherits from:
 133  *  - <OpenLayers.Layer.OSM>
 134  */
 135 OpenLayers.Layer.OSM.Osmarender = OpenLayers.Class(OpenLayers.Layer.OSM, {
 136     /**
 137      * Constructor: OpenLayers.Layer.OSM.Osmarender
 138      *
 139      * Parameters:
 140      * name - {String}
 141      * options - {Object} Hashtable of extra options to tag onto the layer
 142      */
 143     initialize: function(name, options) {
 144         var url = [
 145             "http://a.tah.openstreetmap.org/Tiles/tile.php/",
 146             "http://b.tah.openstreetmap.org/Tiles/tile.php/",
 147             "http://c.tah.openstreetmap.org/Tiles/tile.php/"
 148         ];
 149         options = OpenLayers.Util.extend({ numZoomLevels: 18 }, options);
 150         var newArguments = [name, url, options];
 151         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 152     },
 153
 154     CLASS_NAME: "OpenLayers.Layer.OSM.Osmarender"
 155 });
 156
 157 /**
 158  * Class: OpenLayers.Layer.OSM.Maplint
 159  *
 160  * Inherits from:
 161  *  - <OpenLayers.Layer.OSM>
 162  */
 163 OpenLayers.Layer.OSM.Maplint = OpenLayers.Class(OpenLayers.Layer.OSM, {
 164     /**
 165      * Constructor: OpenLayers.Layer.OSM.Maplint
 166      *
 167      * Parameters:
 168      * name - {String}
 169      * options - {Object} Hashtable of extra options to tag onto the layer
 170      */
 171     initialize: function(name, options) {
 172         var url = [
 173             "http://d.tah.openstreetmap.org/Tiles/maplint.php/",
 174             "http://e.tah.openstreetmap.org/Tiles/maplint.php/",
 175             "http://f.tah.openstreetmap.org/Tiles/maplint.php/"
 176         ];
 177         options = OpenLayers.Util.extend({ numZoomLevels: 18, isBaseLayer: false, visibility: false }, options);
 178         var newArguments = [name, url, options];
 179         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 180     },
 181
 182     CLASS_NAME: "OpenLayers.Layer.OSM.Maplint"
 183 });