protected void initializeLocation(V v,Point2D coord){
  Point point=locations.get(v);
  coord.setLocation(point.x,point.y);
}

protected void initializeLocation ( V v , Point2D coord ) { Point point = locations . get ( v ) ; coord . setLocation ( point . x , point . y ) ; }
sets persisted location for a vertex within the dimensions of the space . if the vertex has not been persisted , sets a random location . if you want to initialize in some different way , override this method .
