code: public void fill(Rectangle clip, IntBiPredicate isInside, IntBinaryOperator pattern)
      {
          fill(clip.x, clip.y, clip.x+clip.width, clip.y+clip.height, isInside, pattern);
      }
docs: Fills clipped area. Area must be surrounded with
  replacement (or clip)
  <p>Note! Pattern is in relative coordinates
  @param clip
  @param isInside
  @param pattern