/// <summary>
/// Calculates the tile id of the tile at position (0, 0) for the given zoom.
/// </summary>
/// <param name="zoom"></param>
/// <returns></returns>
private static ulong CalculateTileId(int zoom)
{
if (zoom == 0)
{ // zoom level 0: {0}.
return(0);
}
//else if (zoom == 1)
//{ // zoom level 1: {1, 2, 3, 4}.
// return 1;
//}
//else if (zoom == 2)
//{ // zoom level 2: {5, 6, 7, 8, 9, 10, 11, 12}.
// return 5;
//}
ulong size = (ulong)System.Math.Pow(2, 2 * (zoom - 1));
return(Tile.CalculateTileId(zoom - 1) + size);
}
private static Tile CalculateTile(ulong id)
{
int zoom = 0;
if (id > 0UL)
{
while (id >= Tile.CalculateTileId(zoom))
{
++zoom;
}
--zoom;
}
long num1 = (long)id - (long)Tile.CalculateTileId(zoom);
ulong num2 = (ulong)System.Math.Pow(2.0, (double)zoom);
long num3 = (long)num2;
int x = (int)((ulong)num1 % (ulong)num3);
long num4 = (long)num2;
int y = (int)((ulong)num1 / (ulong)num4);
return(new Tile(x, y, zoom));
}
/// <summary>
/// Calculate the tile given the id.
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
private static Tile CalculateTile(ulong id)
{
// find out the zoom level first.
int zoom = 0;
if (id > 0)
{ // only if the id is at least at zoom level 1.
while (id >= Tile.CalculateTileId(zoom))
{
// move to the next zoom level and keep searching.
zoom++;
}
zoom--;
}
// calculate the x-y.
ulong local = id - Tile.CalculateTileId(zoom);
ulong width = (ulong)System.Math.Pow(2, zoom);
int x = (int)(local % width);
int y = (int)(local / width);
return new Tile(x, y, zoom);
}
private static ulong CalculateTileId(int zoom)
{
if (zoom == 0)
{
return(0);
}
if (zoom == 1)
{
return(1);
}
if (zoom == 2)
{
return(5);
}
if (zoom == 3)
{
return(21);
}
if (zoom == 4)
{
return(85);
}
if (zoom == 5)
{
return(341);
}
if (zoom == 6)
{
return(1365);
}
if (zoom == 7)
{
return(5461);
}
if (zoom == 8)
{
return(21845);
}
if (zoom == 9)
{
return(87381);
}
if (zoom == 10)
{
return(349525);
}
if (zoom == 11)
{
return(1398101);
}
if (zoom == 12)
{
return(5592405);
}
if (zoom == 13)
{
return(22369621);
}
if (zoom == 14)
{
return(89478485);
}
if (zoom == 15)
{
return(357913941);
}
if (zoom == 16)
{
return(1431655765);
}
if (zoom == 17)
{
return(5726623061);
}
if (zoom == 18)
{
return(22906492245);
}
ulong num = (ulong)System.Math.Pow(2.0, (double)(2 * (zoom - 1)));
return(Tile.CalculateTileId(zoom - 1) + num);
}
/// <summary>
/// Calculates the tile id of the tile at position (0, 0) for the given zoom.
/// </summary>
/// <param name="zoom"></param>
/// <returns></returns>
private static ulong CalculateTileId(int zoom)
{
if (zoom == 0)
{ // zoom level 0: {0}.
return(0);
}
else if (zoom == 1)
{
return(1);
}
else if (zoom == 2)
{
return(5);
}
else if (zoom == 3)
{
return(21);
}
else if (zoom == 4)
{
return(85);
}
else if (zoom == 5)
{
return(341);
}
else if (zoom == 6)
{
return(1365);
}
else if (zoom == 7)
{
return(5461);
}
else if (zoom == 8)
{
return(21845);
}
else if (zoom == 9)
{
return(87381);
}
else if (zoom == 10)
{
return(349525);
}
else if (zoom == 11)
{
return(1398101);
}
else if (zoom == 12)
{
return(5592405);
}
else if (zoom == 13)
{
return(22369621);
}
else if (zoom == 14)
{
return(89478485);
}
else if (zoom == 15)
{
return(357913941);
}
else if (zoom == 16)
{
return(1431655765);
}
else if (zoom == 17)
{
return(5726623061);
}
else if (zoom == 18)
{
return(22906492245);
}
ulong size = (ulong)System.Math.Pow(2, 2 * (zoom - 1));
var tileId = Tile.CalculateTileId(zoom - 1) + size;
return(tileId);
}
/// <summary>
/// Calculates the tile id of the tile at position (x, y) for the given zoom.
/// </summary>
/// <param name="zoom"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
private static ulong CalculateTileId(int zoom, int x, int y)
{
ulong id = Tile.CalculateTileId(zoom);
long width = (long)System.Math.Pow(2, zoom);
return id + (ulong)x + (ulong)(y * width);
}
/// <summary>
/// Calculates the tile id of the tile at position (0, 0) for the given zoom.
/// </summary>
/// <param name="zoom"></param>
/// <returns></returns>
private static ulong CalculateTileId(int zoom)
{
if (zoom == 0)
{ // zoom level 0: {0}.
return 0;
}
else if (zoom == 1)
{
return 1;
}
else if (zoom == 2)
{
return 5;
}
else if(zoom == 3)
{
return 21;
}
else if (zoom == 4)
{
return 85;
}
else if (zoom == 5)
{
return 341;
}
else if (zoom == 6)
{
return 1365;
}
else if (zoom == 7)
{
return 5461;
}
else if (zoom == 8)
{
return 21845;
}
else if (zoom == 9)
{
return 87381;
}
else if (zoom == 10)
{
return 349525;
}
else if (zoom == 11)
{
return 1398101;
}
else if (zoom == 12)
{
return 5592405;
}
else if (zoom == 13)
{
return 22369621;
}
else if (zoom == 14)
{
return 89478485;
}
else if (zoom == 15)
{
return 357913941;
}
else if (zoom == 16)
{
return 1431655765;
}
else if (zoom == 17)
{
return 5726623061;
}
else if (zoom == 18)
{
return 22906492245;
}
ulong size = (ulong)System.Math.Pow(2, 2 * (zoom - 1));
var tileId = Tile.CalculateTileId(zoom - 1) + size;
return tileId;
}
