public double calculateDistance(string Fstreet, string Ftown, string Fcity, string Tstreet, string Ttown, string Tcity)
{
string baseString = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=";
string geoString = baseString + Fstreet + "," + Ftown + "," + Fcity + "&destinations=" + Tstreet + "," + Ttown + "," + Tcity + "&mode=walking&language=eng-ENG&key=" + API_KEY;
string distance = "";
WebResponse response = null;
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(geoString);
request.Method = "GET";
response = request.GetResponse();
if (response != null)
{
string str = null;
using (Stream stream = response.GetResponseStream())
{
using (StreamReader streamReader = new StreamReader(stream))
{
str = streamReader.ReadToEnd();
}
}
MatrixResponse responseMatrix = JsonConvert.DeserializeObject <MatrixResponse>(str);
if (responseMatrix.status == "OK")
{
int count = responseMatrix.rows.Length;
for (int i = 0; i < count; i++)
{
distance = responseMatrix.rows[i].elements[i].distance.text.ToString();
}
}
string newString = distance.Replace("km", " ");
return(Convert.ToDouble(newString));
}
else
{
return(-1.00);
}
}
catch
{
throw new Exception("JSON response failed.");
}
finally
{
if (response != null)
{
response.Close();
response = null;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="latLngs"></param>
/// <returns></returns>
public List <List <Tuple <double, double> > > GetDistanceTimeMatrix(List <Tuple <string, string> > latLngs)
{
var distTimes = new List <List <Tuple <double, double> > >();
MatrixResponse matrix = null;
var url = "https://graphhopper.com/api/1/matrix?type=json&vehicle=car&debug=true&out_array=times&out_array=distances&key=";
url += _apiKey;
url = latLngs.Aggregate(url, (current, latLng) => current + ("&point=" + latLng.Item1) + "," + latLng.Item2);
if (WebRequest.Create(url) is HttpWebRequest request)
{
request.Proxy = null; // Performance hack!
using (var response = request.GetResponse() as HttpWebResponse)
{
if (response != null && response.StatusCode != HttpStatusCode.OK)
{
throw new Exception($"Server error (HTTP {response.StatusCode}: {response.StatusDescription}).");
}
if (response != null)
{
var stream = response.GetResponseStream();
var memStream = new MemoryStream();
if (stream != null)
{
stream.CopyTo(memStream);
memStream.Seek(0, SeekOrigin.Begin);
var jsonSerializer = new DataContractJsonSerializer(typeof(MatrixResponse));
var objResponse = jsonSerializer.ReadObject(memStream);
matrix = objResponse as MatrixResponse;
CreateLastResponse(memStream);
memStream.Close();
stream.Close();
}
}
}
}
// time and distance arrays have all the same length
if (matrix == null)
{
return(distTimes);
}
for (var i = 0; i < matrix.Distances.Count(); i++)
{
var row = new List <Tuple <double, double> >();
for (var k = 0; k < matrix.Distances[i].Count(); k++)
{
var dist = matrix.Distances[i][k];
var time = matrix.Times[i][k];
var distTime = new Tuple <double, double>(Convert.ToDouble(dist ?? 0), Convert.ToDouble(time ?? 0));
row.Add(distTime);
}
distTimes.Add(row);
}
return(distTimes);
}
