ダッシュボードのリンク・レイアウトの取得

 /**
   * Returns the link layout of a dashboard if it is installed.
   * @param dashboard The dashboard diagram.
   * @return The link layout, or null if it is not enabled.
   */
  public static IlvGraphLayout getLinkLayout(IlvDashboardDiagram dashboard) {
    IlvGraphLayoutRenderer renderer =
        dashboard.getEngine().getLinkLayoutRenderer();
    if (renderer != null) {
      return renderer.getGraphLayout();
    }
    return null;
  }