Beginning of JavaScript-only routing UI

vendor/assets/leaflet/leaflet.polyline.js

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+/*
+ * L.PolylineUtil contains utilify functions for polylines, two methods
+ * are added to the L.Polyline object to support creation of polylines
+ * from an encoded string and converting existing polylines to an
+ * encoded string.
+ *
+ *  - L.Polyline.fromEncoded(encoded [, options]) returns a L.Polyline
+ *  - L.Polyline.encodePath() returns a string
+ *
+ * Actual code from:
+ * http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/\
+ */
+
+/*jshint browser:true, debug: true, strict:false, globalstrict:false, indent:4, white:true, smarttabs:true*/
+/*global L:true, console:true*/
+
+
+// Inject functionality into Leaflet
+(function (L) {
+	if (!(L.Polyline.prototype.fromEncoded)) {
+		L.Polyline.fromEncoded = function (encoded, options) {
+			return new L.Polyline(L.PolylineUtil.decode(encoded), options);
+		};
+	}
+	if (!(L.Polygon.prototype.fromEncoded)) {
+		L.Polygon.fromEncoded = function (encoded, options) {
+			return new L.Polygon(L.PolylineUtil.decode(encoded), options);
+		};
+	}
+
+	var encodeMixin = {
+		encodePath: function () {
+			return L.PolylineUtil.encode(this.getLatLngs());
+		}
+	};
+
+	if (!L.Polyline.prototype.encodePath) {
+		L.Polyline.include(encodeMixin);
+	}
+	if (!L.Polygon.prototype.encodePath) {
+		L.Polygon.include(encodeMixin);
+	}
+})(L);
+
+// Utility functions.
+L.PolylineUtil = {};
+
+L.PolylineUtil.encode = function (latlngs) {
+	var i, dlat, dlng;
+	var plat = 0;
+	var plng = 0;
+	var encoded_points = "";
+
+	for (i = 0; i < latlngs.length; i++) {
+		var lat = latlngs[i].lat;
+		var lng = latlngs[i].lng;
+		var late5 = Math.floor(lat * 1e5);
+		var lnge5 = Math.floor(lng * 1e5);
+		dlat = late5 - plat;
+		dlng = lnge5 - plng;
+		plat = late5;
+		plng = lnge5;
+		encoded_points +=
+			L.PolylineUtil.encodeSignedNumber(dlat) +
+			L.PolylineUtil.encodeSignedNumber(dlng);
+	}
+	return encoded_points;
+};
+
+// This function is very similar to Google's, but I added
+// some stuff to deal with the double slash issue.
+L.PolylineUtil.encodeNumber = function (num) {
+	var encodeString = "";
+	var nextValue, finalValue;
+	while (num >= 0x20) {
+		nextValue = (0x20 | (num & 0x1f)) + 63;
+		encodeString += (String.fromCharCode(nextValue));
+		num >>= 5;
+	}
+	finalValue = num + 63;
+	encodeString += (String.fromCharCode(finalValue));
+	return encodeString;
+};
+
+// This one is Google's verbatim.
+L.PolylineUtil.encodeSignedNumber = function (num) {
+	var sgn_num = num << 1;
+	if (num < 0) {
+		sgn_num = ~(sgn_num);
+	}
+	return (L.PolylineUtil.encodeNumber(sgn_num));
+};
+
+L.PolylineUtil.decode = function (encoded) {
+	var len = encoded.length;
+	var index = 0;
+	var latlngs = [];
+	var lat = 0;
+	var lng = 0;
+
+	while (index < len) {
+		var b;
+		var shift = 0;
+		var result = 0;
+		do {
+			b = encoded.charCodeAt(index++) - 63;
+			result |= (b & 0x1f) << shift;
+			shift += 5;
+		} while (b >= 0x20);
+		var dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
+		lat += dlat;
+
+		shift = 0;
+		result = 0;
+		do {
+			b = encoded.charCodeAt(index++) - 63;
+			result |= (b & 0x1f) << shift;
+			shift += 5;
+		} while (b >= 0x20);
+		var dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
+		lng += dlng;
+
+		latlngs.push(new L.LatLng(lat * 1e-5, lng * 1e-5));
+	}
+
+	return latlngs;
+};