+ },
+
+ parseHash: function (hash) {
+ var args = {};
+
+ var i = hash.indexOf("#");
+ if (i < 0) {
+ return args;
+ }
+
+ hash = Qs.parse(hash.slice(i + 1));
+
+ var map = (hash.map || "").split("/"),
+ zoom = parseInt(map[0], 10),
+ lat = parseFloat(map[1]),
+ lon = parseFloat(map[2]);
+
+ if (!isNaN(zoom) && !isNaN(lat) && !isNaN(lon)) {
+ args.center = new L.LatLng(lat, lon);
+ args.zoom = zoom;
+ }
+
+ if (hash.layers) {
+ args.layers = hash.layers;
+ }
+
+ return args;
+ },
+
+ formatHash: function (args) {
+ var center, zoom, layers;
+
+ if (args instanceof L.Map) {
+ center = args.getCenter();
+ zoom = args.getZoom();
+ layers = args.getLayersCode();
+ } else {
+ center = args.center || L.latLng(args.lat, args.lon);
+ zoom = args.zoom;
+ layers = args.layers || "";
+ }
+
+ layers = layers.replace("M", "");
+
+ let hash = "#map=" + [zoom, ...OSM.cropLocation(center, zoom)].join("/");
+
+ if (layers) {
+ hash += "&layers=" + layers;
+ }
+
+ return hash;
+ },
+
+ zoomPrecision: function (zoom) {
+ var pixels = Math.pow(2, 8 + zoom);
+ var degrees = 180;
+ return Math.ceil(Math.log10(pixels / degrees));
+ },
+
+ cropLocation: function (latLng, zoom) {
+ const precision = OSM.zoomPrecision(zoom),
+ wrapped = latLng.wrap();
+ return [wrapped.lat, wrapped.lng].map(c => c.toFixed(precision));
+ },
+
+ locationCookie: function (map) {
+ const zoom = map.getZoom(),
+ center = OSM.cropLocation(map.getCenter(), zoom).reverse();
+ return [...center, zoom, map.getLayersCode()].join("|");
+ },
+
+ distance: function (latlng1, latlng2) {
+ var lat1 = latlng1.lat * Math.PI / 180,
+ lng1 = latlng1.lng * Math.PI / 180,
+ lat2 = latlng2.lat * Math.PI / 180,
+ lng2 = latlng2.lng * Math.PI / 180,
+ latdiff = lat2 - lat1,
+ lngdiff = lng2 - lng1;
+
+ return 6372795 * 2 * Math.asin(
+ Math.sqrt(
+ Math.pow(Math.sin(latdiff / 2), 2) +
+ Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(lngdiff / 2), 2)
+ ));