code: public Rectangle2D getBounds(IRenderingElement element) {
          if (element == null) return null;
          final Bounds bounds = new Bounds(element);
          return new Rectangle2D.Double(bounds.minX, bounds.minY,
                                        bounds.width(), bounds.height());
      }
docs: Given a rendering element, traverse the elements compute required bounds
  to full display all elements. The method searches for {@link Bounds}
  elements which act to specify the required bounds when adjunct labels
  are considered.
  
  @param element a rendering element
  @return the bounds required (null if unspecified)