code: public static Rectangle getBoundaryAbsolute(Tile upperLeft, Tile lowerRight) {
          return new Rectangle(upperLeft.getOrigin().x, upperLeft.getOrigin().y, lowerRight.getOrigin().x + upperLeft.tileSize, lowerRight.getOrigin().y + upperLeft.tileSize);
      }
docs: Extend of the area defined by the two tiles in absolute coordinates.
  
  @param upperLeft  tile in upper left corner of area.
  @param lowerRight tile in lower right corner of area.
  @return rectangle with the absolute coordinates.