X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/66039dedb069400298717415e7c9ce4e444bfcdb..399fe3c12a7612f1ad79d376f2859d9c6fd38839:/app/assets/javascripts/osm.js.erb

diff --git a/app/assets/javascripts/osm.js.erb b/app/assets/javascripts/osm.js.erb
index 382e32bdf..033b2de81 100644
--- a/app/assets/javascripts/osm.js.erb
+++ b/app/assets/javascripts/osm.js.erb
@@ -165,7 +165,14 @@ OSM = {
     return hash;
   },
 
-  zoomPrecision: function (zoom) {
+  zoomPrecision: function(zoom) {
     return Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+  },
+
+  locationCookie: function(map) {
+    var center = map.getCenter().wrap(),
+      zoom = map.getZoom(),
+      precision = OSM.zoomPrecision(zoom);
+    return [center.lng.toFixed(precision), center.lat.toFixed(precision), zoom, map.getLayersCode()].join('|');
   }
 };