code: public static int longitudeToTileXWithScaleFactor(double longitude, double scaleFactor) {
          return pixelXToTileXWithScaleFactor(longitudeToPixelXWithScaleFactor(longitude, scaleFactor, DUMMY_TILE_SIZE), scaleFactor, DUMMY_TILE_SIZE);
      }
docs: Converts a longitude coordinate (in degrees) to the tile X number at a certain scale factor.
  
  @param longitude   the longitude coordinate that should be converted.
  @param scaleFactor the scale factor at which the coordinate should be converted.
  @return the tile X number of the longitude value.