so others may contribute

code/location.js

@@ -0,0 +1,37 @@
+
+// LOCATION HANDLING /////////////////////////////////////////////////
+// i.e. setting initial position and storing new position after moving
+
+// retrieves current position from map and stores it cookies
+window.storeMapPosition = function() {
+  var m = window.map.getCenter();
+  writeCookie('ingress.intelmap.lat', m['lat']);
+  writeCookie('ingress.intelmap.lng', m['lng']);
+  writeCookie('ingress.intelmap.zoom', window.map.getZoom());
+}
+
+// either retrieves the last shown position from a cookie, from the
+// URL or if neither is present, via Geolocation. If that fails, it
+// returns a map that shows the whole world.
+window.getPosition = function() {
+  if(getURLParam('latE6') && getURLParam('lngE6')) {
+    console.log("mappos: reading URL params");
+    var lat = parseInt(getURLParam('latE6'))/1E6 || 0.0;
+    var lng = parseInt(getURLParam('lngE6'))/1E6 || 0.0;
+    // google seems to zoom in far more than leaflet
+    var z = parseInt(getURLParam('z'))+1 || 17;
+    return {center: new L.LatLng(lat, lng), zoom: z > 18 ? 18 : z};
+  }
+
+  if(readCookie('ingress.intelmap.lat') && readCookie('ingress.intelmap.lng')) {
+    console.log("mappos: reading cookies");
+    var lat = parseFloat(readCookie('ingress.intelmap.lat')) || 0.0;
+    var lng = parseFloat(readCookie('ingress.intelmap.lng')) || 0.0;
+    var z = parseInt(readCookie('ingress.intelmap.zoom')) || 17;
+    return {center: new L.LatLng(lat, lng), zoom: z > 18 ? 18 : z};
+  }
+
+  setTimeout("window.map.locate({setView : true, maxZoom: 13});", 50);
+
+  return {center: new L.LatLng(0.0, 0.0), zoom: 1};
+}