for (RectangleWithRef vertex : shapes)
         {
            int equalityDistance = 5;
            if (line.intersects(vertex)
                  && !(line.startsWith(vertex.getCenter(), equalityDistance) || (line
                        .endsWith(vertex.getCenter(), equalityDistance))))
            {
               // determine which diagonale part is intersected and add another
               // point to the polyline
               Line2D.Double diagonalePart = vertex.getUpperLeftDiagonaleLine();
               Pair<Line2D, Point2D> intersection = line
                     .getIntersection(diagonalePart);
               if (intersection != null)
               {
                  line.splitLine(intersection.getFirst(), GeometryBoostUtils
                        .translate(vertex.getUpperLeftCorner(),
                              GeometryBoostUtils.getVector(vertex.getCenter(),
                                    intersection.getSecond())));
               }

               diagonalePart = vertex.getUpperRightDiagonaleLine();
               intersection = line.getIntersection(diagonalePart);
               if (intersection != null)
               {
                  line.splitLine(intersection.getFirst(), GeometryBoostUtils
                        .translate(vertex.getUpperRightCorner(),
                              GeometryBoostUtils.getVector(vertex.getCenter(),
                                    intersection.getSecond())));
               }

               diagonalePart = vertex.getLowerRightDiagonaleLine();
               intersection = line.getIntersection(diagonalePart);
               if (intersection != null)
               {
                  line.splitLine(intersection.getFirst(), GeometryBoostUtils
                        .translate(vertex.getLowerRightCorner(),
                              GeometryBoostUtils.getVector(vertex.getCenter(),
                                    intersection.getSecond())));
               }

               diagonalePart = vertex.getLowerLeftDiagonaleLine();
               intersection = line.getIntersection(diagonalePart);
               if (intersection != null)
               {
                  line.splitLine(intersection.getFirst(), GeometryBoostUtils
                        .translate(vertex.getLowerLeftCorner(),
                              GeometryBoostUtils.getVector(vertex.getCenter(),
                                    intersection.getSecond())));
               }

            }
         }
      }

      return result;
   }

   
   public static <Vertex, Edge> void checkGraph(Graph<Vertex, Edge> graph)

                        Color.GREEN) }));
      vv.getRenderContext().setEdgeStrokeTransformer(
            new ConstantTransformer(new BasicStroke(2.5f)));
      vv.getRenderer().setEdgeLabelRenderer(new BasicEdgeLabelRenderer());

      vv.setBackground(Color.white);

      // add a listener for ToolTips
      vv.setVertexToolTipTransformer(new ToStringLabeller());

      if (graphMouseListener != null)
         vv.addGraphMouseListener(graphMouseListener);

      if (edgeDoubleClickListener != null)
         JungGraphDefaultActions.setEdgeDoubleclickListener(vv,
               edgeDoubleClickListener);

      JPanel result = new JPanel();
      result.setLayout(new BorderLayout());
      result.add(new GraphZoomScrollPane(vv), BorderLayout.CENTER);
      result.add(createDefaultGraphControl(vv, 1.1), BorderLayout.SOUTH);

      return result;
   }

   /**
    * Layouts a graph with edge labels.
    * 
    * @param <Vertex>
    * @param <Edge>
    * @param graph
    * @param vertexDimensionGetter
    * @param edgeLabelDimensionGetter
    * @return
    */
   public static <Vertex, Edge> Pair<Map<Vertex, RectangularShape>, Map<Edge, Pair<RectangularShape, PolyLine>>> layoutGraph(

 public XMLEvent nextTag() throws XMLStreamException {

   XMLEvent event = peek();
   if ( event.isStartElement())
      return nextEvent();
   if ( event.isEndElement())
      return nextEvent();
   if ( event.isCharacters())
   {
     Characters characters = event.asCharacters();
     if ( characters.isWhiteSpace()) {
       nextEvent(); //process event 
       return nextTag();
     } else {
       throw new XMLStreamException( "no whitespaces: " + characters.getData());
     }
     
   } else throw new XMLStreamException( "event " + event.getEventType() + " not supported here.");
   
   
 }

 public XMLEvent peek() throws XMLStreamException {