void initYifanHu() {
   layout = yifanHu.buildLayout();
   layout.setGraphModel(graphModel);
   layout.resetPropertiesValues();
   layout.setAdaptiveCooling(false);
   layout.setStepRatio(stepRatio);
   layout.setOptimalDistance(optimalDistance);
   layout.setBarnesHutTheta(barnesHutTheta);
   layout.setQuadTreeMaxLevel(quadTreeMaxLevel);
   layout.initAlgo();
 }