/**
* Neighbors Integer
*
* Returns all neighbors' hash integers clockwise from north around to northwest
* 7 0 1
* 6 x 2
* 5 4 3
* @param {long} hashInt
* @param {int} bitDepth
* @returns {EncodeInt'd neighborHashIntList|long[]}
*/
public static long[] NeighborsInt(long hashInt, int bitDepth = 52)
{
var lonlat = DecodeInt(hashInt, bitDepth);
var coords = new GeohashDecodeResult
{
Coordinates = lonlat.Coordinates,
Error = new Coordinates
{
Lat = lonlat.Error.Lat*2,
Lon = lonlat.Error.Lon*2
}
};
return new[]
{
EncodeNeighborInt(1, 0, coords, bitDepth),
EncodeNeighborInt(1, 1, coords, bitDepth),
EncodeNeighborInt(0, 1, coords, bitDepth),
EncodeNeighborInt(-1, 1, coords, bitDepth),
EncodeNeighborInt(-1, 0, coords, bitDepth),
EncodeNeighborInt(-1, -1, coords, bitDepth),
EncodeNeighborInt(0, -1, coords, bitDepth),
EncodeNeighborInt(1, -1, coords, bitDepth)
};
}
public static long EncodeNeighborInt(int neighborLatDir, int neighborLonDir, GeohashDecodeResult coords, int bitDepth)
{
var neighborLat = coords.Coordinates.Lat + neighborLatDir*coords.Error.Lat;
var neighborLon = coords.Coordinates.Lon + neighborLonDir*coords.Error.Lon;
return EncodeInt(neighborLat, neighborLon, bitDepth);
}
/**
* Neighbors
*
* Returns all neighbors' hashstrings clockwise from north around to northwest
* 7 0 1
* 6 x 2
* 5 4 3
* @param {string} hashString
* @returns {encoded neighborHashList|string[]}
*/
public static string[] Neighbors(string hashString)
{
var hashstringLength = hashString.Length;
var lonlat = Decode(hashString);
var coords = new GeohashDecodeResult
{
Coordinates = lonlat.Coordinates,
Error = new Coordinates
{
Lat = lonlat.Error.Lat*2,
Lon = lonlat.Error.Lon*2
}
};
return new[]
{
EncodeNeighbor(hashstringLength, 1, 0, coords),
EncodeNeighbor(hashstringLength, 1, 1, coords),
EncodeNeighbor(hashstringLength, 0, 1, coords),
EncodeNeighbor(hashstringLength, -1, 1, coords),
EncodeNeighbor(hashstringLength, -1, 0, coords),
EncodeNeighbor(hashstringLength, -1, -1, coords),
EncodeNeighbor(hashstringLength, 0, -1, coords),
EncodeNeighbor(hashstringLength, 1, -1, coords)
};
}
public static string EncodeNeighbor(int hashstringLength, int neighborLatDir, int neighborLonDir, GeohashDecodeResult coords)
{
var neighborLat = coords.Coordinates.Lat + neighborLatDir*coords.Error.Lat;
var neighborLon = coords.Coordinates.Lon + neighborLonDir*coords.Error.Lon;
return Encode(neighborLat, neighborLon, hashstringLength);
}