public static TimeZoneInfoCache OnlineFromLocation(double Latitude, double Longitude)
{
//get TimezoneInfo online
string cUri = "https://secure.geonames.org/timezoneJSON?style=full&lat=" + Latitude.ToString("0.######", CultureInfo.InvariantCulture) + "&lng=" + Longitude.ToString("0.######", CultureInfo.InvariantCulture) + "&username="******"status"] != null)
{
return(null);
}
TimeZoneInfoCache ti = new TimeZoneInfoCache();
ti.timezoneId = (string)ts["timezoneId"];
ti.gmtOffset = (double)ts["gmtOffset"];
ti.dstOffset = (double)ts["dstOffset"];
ti.timezoneId = sys.ConvertTimeZoneToSystem(ti.timezoneId);
return(ti);
}
catch (Exception e) { e.ToString(); }
return(null);
}
public static TimeZoneInfoCache FromLocation(double Latitude, double Longitude, bool bCacheOnly = false)
{
//check TimeZoneInfoCache
var cache = db.dbAreaCache.Query <TimeZoneInfoCache>("select * from TimeZoneInfoCache where boxWest <= ? and boxNorth >= ? and boxEast >= ? and boxSouth <= ?", Longitude, Latitude, Longitude, Latitude);
cache.ToString();
if (cache.Count > 0)
{
xLog.Debug("TimeZoneInfoCache Volltreffer");
if (cache.Count > 1)
{
cache.ToString();
}
return(cache[0]);
}
if (bCacheOnly)
{
return(null);
}
TimeZoneInfoCache tziNew = OnlineFromLocation(Latitude, Longitude);
if (!string.IsNullOrEmpty(tziNew.timezoneId))
{
Task.Factory.StartNew(() =>
{
int radius = 30000;
PointF center = new PointF((float)Latitude, (float)Longitude);
double mult = 1.1; // mult = 1.1; is more reliable
PointF pn, pe, ps, pw;
pn = pe = ps = pw = new PointF();
while (radius > 100)
{
pn = mySQLiteConnection.calculateDerivedPosition(center, mult * radius, 0);
pe = mySQLiteConnection.calculateDerivedPosition(center, mult * radius, 90);
ps = mySQLiteConnection.calculateDerivedPosition(center, mult * radius, 180);
pw = mySQLiteConnection.calculateDerivedPosition(center, mult * radius, 270);
if (CheckTimeZoneEnd(tziNew, pn, pe, ps, pw))
{
break;
}
radius = radius / 3;
}
tziNew.boxNorth = pn.X;
tziNew.boxEast = pe.Y;
tziNew.boxSouth = ps.X;
tziNew.boxWest = pw.Y;
db.dbAreaCache.Insert(tziNew);
});
}
return(tziNew);
}
private static bool CheckTimeZoneEnd(TimeZoneInfoCache info, PointF pn, PointF pe, PointF ps, PointF pw)
{
TimeZoneInfoCache check = OnlineFromLocation(pe.X, pe.Y);
if (check == null)
{
return(true);
}
if (info.timezoneId != check.timezoneId)
{
return(false);
}
check = OnlineFromLocation(pw.X, pw.Y);
if (check == null)
{
return(true);
}
if (info.timezoneId != check.timezoneId)
{
return(false);
}
check = OnlineFromLocation(pn.X, pn.Y);
if (check == null)
{
return(true);
}
if (info.timezoneId != check.timezoneId)
{
return(false);
}
check = OnlineFromLocation(ps.X, ps.Y);
if (check == null)
{
return(true);
}
if (info.timezoneId != check.timezoneId)
{
return(false);
}
return(true);
}
