public static GDate ForGlobalhash(DateTime date)
{
// W30 adjustments
var dowJonesDate = date.AddDays(-1);
GDate inst = new GDate(date, dowJonesDate);
return(inst);
}
public static double[] CalculateFractions(string djia, GDate gdate)
{
string hashstring = gdate.ToString() + "-" + djia; // In the hash string we always use actual date
string hash = GetMd5Hash(hashstring);
var fraction1 = HexFraction(hash.Substring(0, 16));
var fraction2 = HexFraction(hash.Substring(16, 16));
double[] result = new double[] { fraction1, fraction2 };
return(result);
}
public static GDate ForLongitude(DateTime date, int longitude)
{
var dowJonesDate = date;
// W30 adjustments
if (date >= w30breakdate && longitude > -30)
{
dowJonesDate = date.AddDays(-1);
}
GDate inst = new GDate(date, dowJonesDate);
return(inst);
}
public static string[] GetGlobalHash(DateTime date)
{
var gdate = GDate.ForGlobalhash(date);
var djia = GetDowJonesAsync(gdate).ConfigureAwait(false).GetAwaiter().GetResult();
var fractions = CalculateFractions(djia, gdate);
fractions[0] = fractions[0] * 180.0 - 90.0;
fractions[1] = fractions[1] * 360.0 - 180.0;
var result = (from f in fractions
select f.ToString("F5")).ToArray();
return(result);
}
public static string[] GetGeoHash(DateTime date, int latitude, int longitude)
{
var gdate = GDate.ForLongitude(date, longitude);
var djia = GetDowJonesAsync(gdate).ConfigureAwait(false).GetAwaiter().GetResult();
var fractions = CalculateFractions(djia, gdate);
fractions[0] = (fractions[0] + Math.Abs(latitude)) * Math.Sign(latitude);
fractions[1] = (fractions[1] + Math.Abs(longitude)) * Math.Sign(longitude);
var result = from f in fractions
select f.ToString("F5");
return(result.ToArray());
}
public static async Task <string> GetDowJonesAsync(GDate gdate)
{
// http://geo.crox.net/djia/%Y/%m/%d
// According to the W30 rule, use actual date or date before, depending on date and longitude
var result = await httpClient.GetAsync($"http://geo.crox.net/djia/{gdate.DowJonesString()}");
if (!result.IsSuccessStatusCode)
{
return("");
}
var data = await result.Content.ReadAsStringAsync();
return(data);
}
