| public static GeographicToTile ( double lon, double lat, int zoom ) : IPoint | ||
| lon | double | |
| lat | double | |
| zoom | int | |
| return | IPoint | |
public static IPoint GeographicToTile(double lon, double lat, int zoom)
{
// From http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#C.23
IPoint point = new PointClass();
point.X = (float)((lon + 180.0) / 360.0 * (1 << zoom));
point.Y = (float)((1.0 - Math.Log(Math.Tan(lat * Math.PI / 180.0) + 1.0 / Math.Cos(lat * Math.PI / 180.0)) / Math.PI) / 2.0 * (1 << zoom));
return point;
}
