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:900913",
  55             transitionEffect: "resize"
  56         }, options);
  57         var newArguments = [name, url, options];
  58         OpenLayers.Layer.TMS.prototype.initialize.apply(this, newArguments);
  59     },
  60
  61     /**
  62      * Method: getUrl
  63      *
  64      * Parameters:
  65      * bounds - {<OpenLayers.Bounds>}
  66      *
  67      * Returns:
  68      * {String} A string with the layer's url and parameters and also the
  69      *          passed-in bounds and appropriate tile size specified as
  70      *          parameters
  71      */
  72     getURL: function (bounds) {
  73         var res = this.map.getResolution();
  74         var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
  75         var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
  76         var z = this.map.getZoom();
  77         var limit = Math.pow(2, z);
  78
  79         if (y < 0 || y >= limit)
  80         {
  81             return OpenLayers.Util.OSM.MISSING_TILE_URL;
  82         }
  83         else
  84         {
  85             x = ((x % limit) + limit) % limit;
  86
  87             var url = this.url;
  88             var path = z + "/" + x + "/" + y + ".png";
  89
  90             if (url instanceof Array)
  91             {
  92                 url = this.selectUrl(path, url);
  93             }
  94
  95             return url + path;
  96         }
  97     },
  98
  99     CLASS_NAME: "OpenLayers.Layer.OSM"
 100 });
 101
 102 /**
 103  * Class: OpenLayers.Layer.OSM.Mapnik
 104  *
 105  * Inherits from:
 106  *  - <OpenLayers.Layer.OSM>
 107  */
 108 OpenLayers.Layer.OSM.Mapnik = OpenLayers.Class(OpenLayers.Layer.OSM, {
 109     /**
 110      * Constructor: OpenLayers.Layer.OSM.Mapnik
 111      *
 112      * Parameters:
 113      * name - {String}
 114      * options - {Object} Hashtable of extra options to tag onto the layer
 115      */
 116     initialize: function(name, options) {
 117         var url = [
 118             "http://a.tile.openstreetmap.org/",
 119             "http://b.tile.openstreetmap.org/",
 120             "http://c.tile.openstreetmap.org/"
 121         ];
 122         options = OpenLayers.Util.extend({ numZoomLevels: 19 }, options);
 123         var newArguments = [name, url, options];
 124         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 125     },
 126
 127     CLASS_NAME: "OpenLayers.Layer.OSM.Mapnik"
 128 });
 129
 130 /**
 131  * Class: OpenLayers.Layer.OSM.Osmarender
 132  *
 133  * Inherits from:
 134  *  - <OpenLayers.Layer.OSM>
 135  */
 136 OpenLayers.Layer.OSM.Osmarender = OpenLayers.Class(OpenLayers.Layer.OSM, {
 137     /**
 138      * Constructor: OpenLayers.Layer.OSM.Osmarender
 139      *
 140      * Parameters:
 141      * name - {String}
 142      * options - {Object} Hashtable of extra options to tag onto the layer
 143      */
 144     initialize: function(name, options) {
 145         var url = [
 146             "http://a.tah.openstreetmap.org/Tiles/tile.php/",
 147             "http://b.tah.openstreetmap.org/Tiles/tile.php/",
 148             "http://c.tah.openstreetmap.org/Tiles/tile.php/"
 149         ];
 150         options = OpenLayers.Util.extend({ numZoomLevels: 18 }, options);
 151         var newArguments = [name, url, options];
 152         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 153     },
 154
 155     CLASS_NAME: "OpenLayers.Layer.OSM.Osmarender"
 156 });
 157
 158 /**
 159  * Class: OpenLayers.Layer.OSM.Maplint
 160  *
 161  * Inherits from:
 162  *  - <OpenLayers.Layer.OSM>
 163  */
 164 OpenLayers.Layer.OSM.Maplint = OpenLayers.Class(OpenLayers.Layer.OSM, {
 165     /**
 166      * Constructor: OpenLayers.Layer.OSM.Maplint
 167      *
 168      * Parameters:
 169      * name - {String}
 170      * options - {Object} Hashtable of extra options to tag onto the layer
 171      */
 172     initialize: function(name, options) {
 173         var url = [
 174             "http://d.tah.openstreetmap.org/Tiles/maplint.php/",
 175             "http://e.tah.openstreetmap.org/Tiles/maplint.php/",
 176             "http://f.tah.openstreetmap.org/Tiles/maplint.php/"
 177         ];
 178         options = OpenLayers.Util.extend({ numZoomLevels: 18, isBaseLayer: false, visibility: false }, options);
 179         var newArguments = [name, url, options];
 180         OpenLayers.Layer.OSM.prototype.initialize.apply(this, newArguments);
 181     },
 182
 183     CLASS_NAME: "OpenLayers.Layer.OSM.Maplint"
 184 });