code: public Rectangle enlarge(double left, double top, double right, double bottom) {
          return new Rectangle(this.left - left, this.top - top, this.right + right, this.bottom + bottom);
      }
docs: Enlarges the Rectangle sides individually
  @param left left enlargement
  @param top top enlargement
  @param right right enlargement
  @param bottom bottom enlargement
  @return