public static Directions GetDirections(LatLon origen, LatLon destino, string mode, string avoid, params LatLon[] waypoints)
{
try
{
var baseUrl = string.Format(DirectionsUrl, origen, destino, mode);
if (!string.IsNullOrEmpty(avoid))
{
baseUrl += string.Concat("&avoid=", avoid);
}
if (waypoints != null && waypoints.Length > 0)
{
baseUrl += "&waypoints=" + waypoints.Aggregate(string.Empty, (w, y) => string.Concat(w, "|", y));
var index = baseUrl.IndexOf('|');
baseUrl = baseUrl.Remove(index, 1);
}
var xml = new XmlDocument();
xml.Load(baseUrl);
var status = xml.GetXmlNode("status");
if (status == null || status.InnerText != "OK")
{
return(null);
}
var route = xml.GetXmlNode("route");
if (route == null)
{
return(null);
}
var ci = CultureInfo.InvariantCulture;
var summary = route.GetInnerText("summary");
var directions = new Directions
{
Descripcion = summary
};
var legs = route.GetChilds("leg");
foreach (var leg in legs)
{
var steps = leg.GetChilds("step");
var directionsLeg = new DirectionsLeg();
directions.Legs.Add(directionsLeg);
foreach (var step in steps)
{
var stepstartlat = step.GetChild("start_location").GetInnerText("lat");
var stepstartlon = step.GetChild("start_location").GetInnerText("lng");
var stependlat = step.GetChild("end_location").GetInnerText("lat");
var stependlon = step.GetChild("end_location").GetInnerText("lng");
var stepduration = step.GetChild("duration").GetInnerText("value");
var stepdistance = step.GetChild("distance").GetInnerText("value");
var steppolyline = step.GetChild("polyline").GetInnerText("points");
var stepinstructions = step.GetInnerText("html_instructions");
var directionsStep = new DirectionsStep
{
StartLocation =
new LatLon(Convert.ToDouble(stepstartlat, ci),
Convert.ToDouble(stepstartlon, ci)),
EndLocation =
new LatLon(Convert.ToDouble(stependlat, ci),
Convert.ToDouble(stependlon, ci)),
Duration = TimeSpan.FromSeconds(Convert.ToInt32(stepduration, ci)),
Distance = Convert.ToDouble(stepdistance, ci),
Points = DecodePolylinePoints(steppolyline),
Instructions = stepinstructions
};
directionsLeg.Steps.Add(directionsStep);
}
}
return(directions);
}
catch (Exception ex)
{
STrace.Exception("GoogleDirections", ex);
return(null);
}
}
private static List <LatLon> DecodePolylinePoints(string encodedPoints)
{
if (string.IsNullOrEmpty(encodedPoints))
{
return(null);
}
var poly = new List <LatLon>();
var polylinechars = encodedPoints.ToCharArray();
var index = 0;
var currentLat = 0;
int currentLng = 0;
int next5bits;
int sum;
int shifter;
try
{
while (index < polylinechars.Length)
{
// calculate next latitude
sum = 0;
shifter = 0;
do
{
next5bits = (int)polylinechars[index++] - 63;
sum |= (next5bits & 31) << shifter;
shifter += 5;
} while (next5bits >= 32 && index < polylinechars.Length);
if (index >= polylinechars.Length)
{
break;
}
currentLat += (sum & 1) == 1 ? ~(sum >> 1) : (sum >> 1);
//calculate next longitude
sum = 0;
shifter = 0;
do
{
next5bits = (int)polylinechars[index++] - 63;
sum |= (next5bits & 31) << shifter;
shifter += 5;
} while (next5bits >= 32 && index < polylinechars.Length);
if (index >= polylinechars.Length && next5bits >= 32)
{
break;
}
currentLng += (sum & 1) == 1 ? ~(sum >> 1) : (sum >> 1);
var p = new LatLon(Convert.ToDouble(currentLat) / 100000.0,
Convert.ToDouble(currentLng) / 100000.0);
poly.Add(p);
}
}
catch (Exception)
{
// logo it
}
return(poly);
}
