add immoweb ui

immoweb/node_modules/@turf/distance/index.js

@@ -0,0 +1,60 @@
+var getCoord = require('@turf/invariant').getCoord;
+var radiansToDistance = require('@turf/helpers').radiansToDistance;
+//http://en.wikipedia.org/wiki/Haversine_formula
+//http://www.movable-type.co.uk/scripts/latlong.html
+
+/**
+ * Calculates the distance between two {@link Point|points} in degrees, radians,
+ * miles, or kilometers. This uses the
+ * [Haversine formula](http://en.wikipedia.org/wiki/Haversine_formula)
+ * to account for global curvature.
+ *
+ * @name distance
+ * @param {Feature<Point>} from origin point
+ * @param {Feature<Point>} to destination point
+ * @param {string} [units=kilometers] can be degrees, radians, miles, or kilometers
+ * @returns {number} distance between the two points
+ * @example
+ * var from = {
+ *   "type": "Feature",
+ *   "properties": {},
+ *   "geometry": {
+ *     "type": "Point",
+ *     "coordinates": [-75.343, 39.984]
+ *   }
+ * };
+ * var to = {
+ *   "type": "Feature",
+ *   "properties": {},
+ *   "geometry": {
+ *     "type": "Point",
+ *     "coordinates": [-75.534, 39.123]
+ *   }
+ * };
+ * var units = "miles";
+ *
+ * var points = {
+ *   "type": "FeatureCollection",
+ *   "features": [from, to]
+ * };
+ *
+ * //=points
+ *
+ * var distance = turf.distance(from, to, units);
+ *
+ * //=distance
+ */
+module.exports = function (from, to, units) {
+    var degrees2radians = Math.PI / 180;
+    var coordinates1 = getCoord(from);
+    var coordinates2 = getCoord(to);
+    var dLat = degrees2radians * (coordinates2[1] - coordinates1[1]);
+    var dLon = degrees2radians * (coordinates2[0] - coordinates1[0]);
+    var lat1 = degrees2radians * coordinates1[1];
+    var lat2 = degrees2radians * coordinates2[1];
+
+    var a = Math.pow(Math.sin(dLat / 2), 2) +
+          Math.pow(Math.sin(dLon / 2), 2) * Math.cos(lat1) * Math.cos(lat2);
+
+    return radiansToDistance(2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)), units);
+};