code: public String getTile(int x, int y) {
          if ((x > getArrayWidth()) || (y > getArrayHeight()) || (x < 0) || (y < 0)) {
              throw new IllegalArgumentException();
          }
          return image[x][y];
      }
docs: Gets a tile of the XPM Image.
  
  @param x Between 0 and 31.
  @param y Between 0 and 7.
  @return An XPM image string defining an 8*8 image.