code: boolean completePartiallyPlacedRing(IRingSet rset, IRing ring, double bondLength) {
          if (ring.getFlag(CDKConstants.ISPLACED))
              return true;
          IRing partiallyPlacedRing = molecule.getBuilder().newInstance(IRing.class);
          for (IAtom atom : ring.atoms())
              if (atom.getPoint2d() != null)
                  atom.setFlag(CDKConstants.ISPLACED, true);
          AtomPlacer.copyPlaced(partiallyPlacedRing, ring);
  
          if (partiallyPlacedRing.getAtomCount() > 1 &&
              partiallyPlacedRing.getAtomCount() < ring.getAtomCount()) {
              placeConnectedRings(rset, partiallyPlacedRing, RingPlacer.FUSED, bondLength);
              placeConnectedRings(rset, partiallyPlacedRing, RingPlacer.BRIDGED, bondLength);
              placeConnectedRings(rset, partiallyPlacedRing, RingPlacer.SPIRO, bondLength);
              ring.setFlag(CDKConstants.ISPLACED, true);
              return true;
          } else {
              return false;
          }
      }
docs: Completes the layout of a partially laid out ring.
  
  @param rset ring set
  @param ring the ring to complete
  @param bondLength the bond length