code: public boolean isFogged(int tx, int ty)
      {
          return mapFogged.getTile(tx, ty).getNumber() < MapTileFog.FOG;
      }
docs: In case of active fog of war, check if tile is hidden by fog.
  
  @param tx The horizontal tile.
  @param ty The vertical tile.
  @return <code>true</code> if hidden by fog, <code>false</code> else.