zoomPrecision doesn't need to be higher-order

[rails.git] / app / assets / javascripts / leaflet.extend.js.erb

diff --git a/app/assets/javascripts/leaflet.extend.js.erb b/app/assets/javascripts/leaflet.extend.js.erb
index 3b505302f300d23258de983307695f3c1ec5f9aa..91cb12091140718376cd845659f057302d70cf93 100644 (file)
--- a/app/assets/javascripts/leaflet.extend.js.erb
+++ b/app/assets/javascripts/leaflet.extend.js.erb
@@ -10,22 +10,86 @@ L.extend(L.LatLngBounds.prototype, {
 });
 
 L.extend(L.Map.prototype, {
-    getLayersCode: function() {
-        var layerConfig = '';
-        for (var i in this._layers) { // TODO: map.eachLayer
-            var layer = this._layers[i];
-            if (layer.options && layer.options.code) {
-                layerConfig += layer.options.code;
-            }
-        }
-        return layerConfig;
-    },
-    getMapBaseLayerId: function() {
-        for (var i in this._layers) { // TODO: map.eachLayer
-            var layer = this._layers[i];
-            if (layer.options && layer.options.keyid) return layer.options.keyid;
-        }
+  getLayersCode: function () {
+    var layerConfig = '';
+    for (var i in this._layers) { // TODO: map.eachLayer
+      var layer = this._layers[i];
+      if (layer.options && layer.options.code) {
+        layerConfig += layer.options.code;
+      }
     }
+    return layerConfig;
+  },
+
+  getMapBaseLayerId: function () {
+    for (var i in this._layers) { // TODO: map.eachLayer
+      var layer = this._layers[i];
+      if (layer.options && layer.options.keyid) return layer.options.keyid;
+    }
+  },
+
+  getUrl: function(marker) {
+    var center = this.getCenter(),
+        zoom = this.getZoom(),
+        precision = zoomPrecision(zoom),
+        params = {
+          lat: center.lat.toFixed(precision),
+          lon: center.lng.toFixed(precision),
+          zoom: zoom,
+          layers: this.getLayersCode()
+        };
+
+    if (marker && this.hasLayer(marker)) {
+      params.mlat = marker.getLatLng().lat.toFixed(precision);
+      params.mlon = marker.getLatLng().lng.toFixed(precision);
+    }
+
+    return 'http://' + OSM.SERVER_URL + '/?' + querystring.stringify(params);
+  },
+
+  getShortUrl: function(marker) {
+    var zoom = this.getZoom(),
+      latLng = marker && this.hasLayer(marker) ? marker.getLatLng() : this.getCenter(),
+      str = '',
+      char_array = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_~",
+      x = Math.round((latLng.lng + 180.0) * ((1 << 30) / 90.0)),
+      y = Math.round((latLng.lat + 90.0) * ((1 << 30) / 45.0)),
+      // JavaScript only has to keep 32 bits of bitwise operators, so this has to be
+      // done in two parts. each of the parts c1/c2 has 30 bits of the total in it
+      // and drops the last 4 bits of the full 64 bit Morton code.
+      c1 = interlace(x >>> 17, y >>> 17), c2 = interlace((x >>> 2) & 0x7fff, (y >>> 2) & 0x7fff),
+      digit;
+
+    for (var i = 0; i < Math.ceil((zoom + 8) / 3.0) && i < 5; ++i) {
+      digit = (c1 >> (24 - 6 * i)) & 0x3f;
+      str += char_array.charAt(digit);
+    }
+    for (i = 5; i < Math.ceil((zoom + 8) / 3.0); ++i) {
+      digit = (c2 >> (24 - 6 * (i - 5))) & 0x3f;
+      str += char_array.charAt(digit);
+    }
+    for (i = 0; i < ((zoom + 8) % 3); ++i) str += "-";
+
+    // Called to interlace the bits in x and y, making a Morton code.
+    function interlace(x, y) {
+      x = (x | (x << 8)) & 0x00ff00ff;
+      x = (x | (x << 4)) & 0x0f0f0f0f;
+      x = (x | (x << 2)) & 0x33333333;
+      x = (x | (x << 1)) & 0x55555555;
+      y = (y | (y << 8)) & 0x00ff00ff;
+      y = (y | (y << 4)) & 0x0f0f0f0f;
+      y = (y | (y << 2)) & 0x33333333;
+      y = (y | (y << 1)) & 0x55555555;
+      return (x << 1) | y;
+    }
+
+    if (marker && this.hasLayer(marker)) {
+      str += '?m'
+    }
+
+    return (window.location.hostname.match(/^www\.openstreetmap\.org/i) ?
+            'http://osm.org/go/' : 'http://' + window.location.hostname + '/go/') + str;
+  }
 });
 
 L.Icon.Default.imagePath = <%= "#{asset_prefix}/images".to_json %>;