add immoweb ui

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

@@ -0,0 +1,59 @@
+//http://en.wikipedia.org/wiki/Haversine_formula
+//http://www.movable-type.co.uk/scripts/latlong.html
+var getCoord = require('@turf/invariant').getCoord;
+var helpers = require('@turf/helpers');
+var point = helpers.point;
+var distanceToRadians = helpers.distanceToRadians;
+
+/**
+ * Takes a {@link Point} and calculates the location of a destination point given a distance in degrees, radians, miles, or kilometers; and bearing in degrees. This uses the [Haversine formula](http://en.wikipedia.org/wiki/Haversine_formula) to account for global curvature.
+ *
+ * @name destination
+ * @param {Feature<Point>} from starting point
+ * @param {number} distance distance from the starting point
+ * @param {number} bearing ranging from -180 to 180
+ * @param {string} [units=kilometers] miles, kilometers, degrees, or radians
+ * @returns {Feature<Point>} destination point
+ * @example
+ * var point = {
+ *   "type": "Feature",
+ *   "properties": {
+ *     "marker-color": "#0f0"
+ *   },
+ *   "geometry": {
+ *     "type": "Point",
+ *     "coordinates": [-75.343, 39.984]
+ *   }
+ * };
+ * var distance = 50;
+ * var bearing = 90;
+ * var units = 'miles';
+ *
+ * var destination = turf.destination(point, distance, bearing, units);
+ * destination.properties['marker-color'] = '#f00';
+ *
+ * var result = {
+ *   "type": "FeatureCollection",
+ *   "features": [point, destination]
+ * };
+ *
+ * //=result
+ */
+module.exports = function (from, distance, bearing, units) {
+    var degrees2radians = Math.PI / 180;
+    var radians2degrees = 180 / Math.PI;
+    var coordinates1 = getCoord(from);
+    var longitude1 = degrees2radians * coordinates1[0];
+    var latitude1 = degrees2radians * coordinates1[1];
+    var bearing_rad = degrees2radians * bearing;
+
+    var radians = distanceToRadians(distance, units);
+
+    var latitude2 = Math.asin(Math.sin(latitude1) * Math.cos(radians) +
+        Math.cos(latitude1) * Math.sin(radians) * Math.cos(bearing_rad));
+    var longitude2 = longitude1 + Math.atan2(Math.sin(bearing_rad) *
+        Math.sin(radians) * Math.cos(latitude1),
+        Math.cos(radians) - Math.sin(latitude1) * Math.sin(latitude2));
+
+    return point([radians2degrees * longitude2, radians2degrees * latitude2]);
+};