public async Task <int> findNearestSite()
{
try
{
geoLoc = new Geolocator {
ReportInterval = 2000
};
var pos = await geoLoc.GetGeopositionAsync();
var p = pos.Coordinate.Point;
var gpsPos = new GpsPoint {
twd97Lat = p.Position.Latitude, twd97Lon = p.Position.Longitude
};
var dists = new List <double>();
foreach (var s in sitesGeoDict)
{
dists.Add(StaticTaqModel.posDist(gpsPos, s.Value));
}
var minId = dists.FindIndex(v => v == dists.Min());
nearestSite = sitesGeoDict.Keys.ToList()[minId];
}
catch
{
throw new Exception(resLoader.GetString("positioningNearestSiteFail"));
}
return(0);
}
// Squared Euclidean distance.
public static double posDist(GpsPoint p1, GpsPoint p2)
{
return(Math.Pow(p1.twd97Lat - p2.twd97Lat, 2) + Math.Pow(p1.twd97Lon - p2.twd97Lon, 2));
}