X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/07976676decf321bffb3e1f3cb6782a15dae5ade..1f22b625a045b7ce25a4668f404071aef8ab8b09:/app/assets/javascripts/osm.js.erb

diff --git a/app/assets/javascripts/osm.js.erb b/app/assets/javascripts/osm.js.erb
index 922bd2639..bd65182a7 100644
--- a/app/assets/javascripts/osm.js.erb
+++ b/app/assets/javascripts/osm.js.erb
@@ -153,7 +153,7 @@ OSM = {
     center = center.wrap();
     layers = layers.replace('M', '');
 
-    var precision = zoomPrecision(zoom),
+    var precision = OSM.zoomPrecision(zoom),
       hash = '#map=' + zoom +
         '/' + center.lat.toFixed(precision) +
         '/' + center.lng.toFixed(precision);
@@ -163,5 +163,14 @@ OSM = {
     }
 
     return hash;
+  },
+
+  zoomPrecision: function(zoom) {
+    return Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+  },
+
+  locationCookie: function(map) {
+    var center = map.getCenter().wrap();
+    return [center.lng, center.lat, map.getZoom(), map.getLayersCode()].join('|');
   }
 };