X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/665abc501c6f46c989bc2055991e5c9a5b87eaf2..66039dedb069400298717415e7c9ce4e444bfcdb:/app/assets/javascripts/osm.js.erb

diff --git a/app/assets/javascripts/osm.js.erb b/app/assets/javascripts/osm.js.erb
index 922bd2639..382e32bdf 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 +163,9 @@ OSM = {
     }
 
     return hash;
+  },
+
+  zoomPrecision: function (zoom) {
+    return Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
   }
 };