public void updateOvlpForIPOGs() {
   int i, len = IPOGNode.IPOGs.size();
   for (i = 0; i < len; i++) {
     IPOGNode.IPOGs.get(i).setOverlappingInfo(preOvlp, preRid, postOvlp, postRid);
     if (cContourShape == null) IPOGNode.setArea(getRegionArea());
   }
 }
 public void setArea(int area) {
   this.area = area;
   IPOGNode.setArea(area);
 }