/// <summary>
/// 瓦片坐标转墨卡坐标
/// </summary>
/// <param name="tile"></param>
/// <param name="zoom"></param>
/// <returns></returns>
public static LanLat TileToMercato(ref TilePos tile, int zoom)
{
int s = 1 << (18 - zoom);
double x = tile.x * 256 + tile.ox;
x *= s;
double y = tile.y * 256 + tile.oy;
y *= s;
var ll = new LanLat();
ll.x = x;
ll.y = y;
return(ll);
}
/// <summary>
/// 墨卡坐标转瓦片坐标
/// </summary>
/// <param name="ll"></param>
/// <param name="zoom">3-18</param>
public static TilePos MercatoToTile(LanLat ll, int zoom)
{
int s = 1 << (18 - zoom);
double tx = ll.x / s;
double mx = tx / 256;
double rx = tx % 256;
double ty = ll.y / s;
double my = ty / 256;
double ry = ty % 256;
var ti = new TilePos();
ti.x = (int)mx;
ti.y = (int)my;
ti.ox = (float)rx;
ti.oy = (float)ry;
return(ti);
}