public static Route GetRoute(Location from, Location to)
{
lock (routes)
{
var key = Route.GetKey(from, to);
if (routes.ContainsKey(key))
{
return(routes[key]);
}
const double metersToMiles = 0.000621371192;
const int maxDuration = 10;
var doc = new XmlDocument();
var elapse = new TimeSpan(0, 0, 0);
double totalDistance = 0;
var url = "http://maps.googleapis.com/maps/api/directions/xml?origin=" + from.Lat + ", " + from.Lng + "&destination=" + to.Lat + ", " + to.Lng + "&sensor=false&units=imperial";
doc.Load(url);
var status = doc.SelectSingleNode("//DirectionsResponse/status");
if (status == null || status.InnerText == "ZERO_RESULTS")
{
return(null);
}
var waypoints = new List <Waypoint> {
new Waypoint(@from, new TimeSpan(0), 0)
};
var legs = doc.SelectNodes("//DirectionsResponse/route/leg");
foreach (XmlNode leg in legs)
{
var stepNodes = leg.SelectNodes("step");
foreach (XmlNode stepNode in stepNodes)
{
var duration = int.Parse(stepNode.SelectSingleNode("duration/value").InnerText);
var distance = double.Parse(stepNode.SelectSingleNode("distance/value").InnerText) * metersToMiles;
var duration2 = new TimeSpan(0, 0, int.Parse(stepNode.SelectSingleNode("duration/value").InnerText));
var end = new Location(double.Parse(stepNode.SelectSingleNode("end_location/lat").InnerText), double.Parse(stepNode.SelectSingleNode("end_location/lng").InnerText));
var totalDistanceTemp = totalDistance;
totalDistance += distance;
var timeSpanTemp = elapse;
elapse += duration2;
if (duration > maxDuration)
{
var polyline = stepNode.SelectSingleNode("polyline/points").InnerText;
var locations = DecodePolylinePoints(polyline);
waypoints.AddRange(IncreaseGranularityInPolylineList(locations, duration, maxDuration, timeSpanTemp.TotalSeconds, distance, totalDistanceTemp));
}
else
{
waypoints.Add(new Waypoint(end, elapse, totalDistance));
}
}
}
waypoints.Add(new Waypoint(to, elapse, totalDistance));
var route = new Route(waypoints.ToArray());
routes.Add(key, route);
return(route);
}
}
