code: public IRenderingElement generateRingElements(IBond bond, IRing ring, RendererModel model) {
          if (isSingle(bond) && isStereoBond(bond)) {
              return generateStereoElement(bond, model);
          } else if (isDouble(bond)) {
              ElementGroup pair = new ElementGroup();
              pair.add(generateBondElement(bond, IBond.Order.SINGLE, model));
              pair.add(generateInnerElement(bond, ring, model));
              return pair;
          } else {
              return generateBondElement(bond, model);
          }
      }
docs: Generate ring elements, such as inner-ring bonds or ring stereo elements.
  
  @param bond the ring bond to use when generating elements
  @param ring the ring that the bond is in
  @param model the renderer model
  @return one or more rendering elements