/**
   * Creates and returns a map of attributes to be used as defaults for vertex attributes.
   *
   * @return a map of attributes to be used as defaults for vertex attributes.
   */
  public static AttributeMap createDefaultVertexAttributes() {
    AttributeMap map = new AttributeMap();
    Color c = Color.decode("#FF9900");

    GraphConstants.setBounds(map, new Rectangle2D.Double(50, 50, 90, 30));
    GraphConstants.setBorder(map, BorderFactory.createRaisedBevelBorder());
    GraphConstants.setBackground(map, c);
    GraphConstants.setForeground(map, Color.white);
    GraphConstants.setFont(map, GraphConstants.DEFAULTFONT.deriveFont(Font.BOLD, 12));
    GraphConstants.setOpaque(map, true);

    return map;
  }