/// <summary>
/// 1.获取字符串长度的网格范围
/// 2.从leftTop开始，根据
/// </summary>
/// <param name="rect"></param>
/// <param name="characterLength"></param>
private void splitRectangle(RectangleD rect, int characterLength)
{
double xRange = GeoHashSizeTable.LonCharacterRange[characterLength];
double yRange = GeoHashSizeTable.LatCharacterRange[characterLength];
//由leftTop开始分裂
double x = rect.Left;
while (x <= rect.Right)
{
double y = rect.Top;
while (y <= rect.Bottom)
{
GeoHash hash = GeoHash.EncodeWithCharacterPrecision(x, y, characterLength);
if (!_geoHashes.Contains(hash))
{
_geoHashes.Add(hash);
}
if (y == rect.Bottom)
{
break;
}
y = nextLonLat(y, yRange, rect.Bottom);
}
if (x == rect.Right)
{
break;
}
x = nextLonLat(x, xRange, rect.Right);
}
}
private void expandSearch(GeoHash hash)
{
addSearchHash(hash);
foreach (GeoHash gh in hash.GetEightDirection())
{
if (gh.Bound.IsIntersect(Rect) && !_geoHashes.Contains(gh))
{
addSearchHash(gh);
}
}
}
public GeoHashRectangleQuery(RectangleD rect)
{
Rect = rect;
int length = GeoHashSizeTable.NumberOfCharacter(rect);
GeoHash hash = GeoHash.EncodeWithCharacterPrecision(rect.Center, length);
if (hash.Bound.Contains(rect))
{
addSearchHash(hash);
}
else
{
expandSearch(hash);
}
}
public override bool Equals(object obj)
{
if (this == obj)
{
return(true);
}
else
{
GeoHash hash = obj as GeoHash;
if (hash != null && DesiredPrecision == hash.DesiredPrecision && Bits == hash.Bits)
{
return(true);
}
}
return(false);
}
static void Main(string[] args)
{
if (args.Length < 1 || args.Length > 3)
{
Usage();
}
DateTime date;
string[] coords;
if (args[0] == "-g")
{
if (args.Length == 1)
{
date = DateTime.Now;
}
else
{
date = DateTime.Parse(args[1]);
}
coords = GeoHash.GetGlobalHash(date);
Console.WriteLine($"Globalhash: {coords[0]} {coords[1]}");
}
else
{
if (args.Length == 2)
{
date = DateTime.Now;
}
else
{
date = DateTime.Parse(args[2]);
}
int latitude = int.Parse(args[0]);
int longitude = int.Parse(args[1]);
coords = GeoHash.GetGeoHash(date, latitude, longitude);
Console.WriteLine($"Geohash: {coords[0]} {coords[1]}");
}
}
private void addSearchHash(GeoHash hash)
{
Bound.Union(hash.Bound);
_geoHashes.Add(hash);
}
