public static GeoHashQuery queryForGeoHash(GeoHash geohash, int bits)
{
string hash = geohash.getGeoHashString();
int precision = (int)Math.Ceiling((double)bits / Base32Utils.BITS_PER_BASE32_CHAR);
if (hash.Length < precision)
{
return(new GeoHashQuery(hash, hash + "~"));
}
hash = hash.Substring(0, precision);
string baseS = hash.Substring(0, hash.Length - 1);
int lastValue = Base32Utils.base32CharToValue(hash[(hash.Length - 1)]);
int significantBits = bits - (baseS.Length * Base32Utils.BITS_PER_BASE32_CHAR);
int unusedBits = (Base32Utils.BITS_PER_BASE32_CHAR - significantBits);
// delete unused bits
int startValue = (lastValue >> unusedBits) << unusedBits;
int endValue = startValue + (1 << unusedBits);
string startHash = baseS + Base32Utils.valueToBase32Char(startValue);
string endHash;
if (endValue > 31)
{
endHash = baseS + "~";
}
else
{
endHash = baseS + Base32Utils.valueToBase32Char(endValue);
}
return(new GeoHashQuery(startHash, endHash));
}
public bool containsGeoHash(GeoHash hash)
{
string hashStr = hash.getGeoHashString();
return(this.startValue.CompareTo(hashStr) <= 0 && this.endValue.CompareTo(hashStr) > 0);
}
