Use IP GeoLocation to choose a default view for the slippy map if

[rails.git] / public / javascripts / map.js

diff --git a/public/javascripts/map.js b/public/javascripts/map.js
index 4ba66b03fb2b36b19bb74c06668b7036fdfef235..781ea5551de36d67030e872cc07ae3a1dac7f05f 100644 (file)
--- a/public/javascripts/map.js
+++ b/public/javascripts/map.js
@@ -2,13 +2,13 @@ var map;
 var markers;
 var popup;
 
-function createMap(divName, centre, zoom) {
+function createMap(divName) {
    OpenLayers.Util.onImageLoadError = function() {
       this.src = OpenLayers.Util.getImagesLocation() + "404.png";
    }
 
    map = new OpenLayers.Map(divName,
-                            { maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
+                            { maxExtent: new OpenLayers.Bounds(-20037508,-20037508,20037508,20037508),
                               numZoomLevels: 19,
                               maxResolution: 156543,
                               units: 'm',
@@ -16,16 +16,18 @@ function createMap(divName, centre, zoom) {
 
    var mapnik = new OpenLayers.Layer.TMS("Mapnik",
                                          "http://tile.openstreetmap.org/",
-                                         { type: 'png', getURL: getTileURL });
+                                         { type: 'png', getURL: getTileURL, displayOutsideMaxExtent: true });
    map.addLayer(mapnik);
 
    var osmarender = new OpenLayers.Layer.TMS("Osmarender",
                                              "http://dev.openstreetmap.org/~ojw/Tiles/tile.php/",
-                                             { type: 'png', getURL: getTileURL });
+                                             { type: 'png', getURL: getTileURL, displayOutsideMaxExtent: true });
    map.addLayer(osmarender);
 
+   markers = new OpenLayers.Layer.Markers("markers", { visibility: false });
+   map.addLayer(markers);
+
    map.addControl(new OpenLayers.Control.LayerSwitcher());
-   map.setCenter(centre, zoom);
 
    return map;
 }
@@ -35,19 +37,25 @@ function getTileURL(bounds) {
    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();
+   var limit = Math.pow(2, z);
 
-   return this.url + z + "/" + x + "/" + y + "." + this.type;
-}
+   if (y < 0 || y >= limit)
+   {
+     return null;
+   }
+   else
+   {
+     x = ((x % limit) + limit) % limit;
 
-function addMarkerToMap(position, icon, description) {
-   if (markers == null) {
-      markers = new OpenLayers.Layer.Markers("markers");
-      map.addLayer(markers);
+     return this.url + z + "/" + x + "/" + y + "." + this.type;
    }
+}
 
+function addMarkerToMap(position, icon, description) {
    var marker = new OpenLayers.Marker(position, icon);
 
    markers.addMarker(marker);
+   markers.setVisibility(true);
 
    if (description) {
       marker.events.register("click", marker, function() { openMapPopup(marker, description) });
@@ -86,19 +94,47 @@ function removeMarkerFromMap(marker){
    markers.removeMarker(marker);
 }
 
+function getMapLayers() {
+   var layers = "";
+
+   for (var i=0; i< this.map.layers.length; i++) {
+      var layer = this.map.layers[i];
+
+      if (layer.isBaseLayer) {
+         layers += (layer == this.map.baseLayer) ? "B" : "0";
+      } else {
+         layers += (layer.getVisibility()) ? "T" : "F";
+      }
+   }
+
+   return layers;
+}
+
+function setMapLayers(layers) {
+   for (var i=0; i < layers.length; i++) {
+      var layer = map.layers[i];
+      var c = layers.charAt(i);
+
+      if (c == "B") {
+         map.setBaseLayer(layer);
+      } else if ( (c == "T") || (c == "F") ) {
+         layer.setVisibility(c == "T");
+      }
+   }
+}
+
 function mercatorToLonLat(merc) {
    var lon = (merc.lon / 20037508.34) * 180;
    var lat = (merc.lat / 20037508.34) * 180;
-   var PI = 3.14159265358979323846;
 
-   lat = 180/PI * (2 * Math.atan(Math.exp(lat * PI / 180)) - PI / 2);
+   lat = 180/Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180)) - Math.PI / 2);
 
    return new OpenLayers.LonLat(lon, lat);
 }
 
 function lonLatToMercator(ll) {
    var lon = ll.lon * 20037508.34 / 180;
-   var lat = Math.log(Math.tan((90 + ll.lat) * PI / 360)) / (PI / 180);
+   var lat = Math.log(Math.tan((90 + ll.lat) * Math.PI / 360)) / (Math.PI / 180);
 
    lat = lat * 20037508.34 / 180;