public void render(Graphics2D g2, int xOffset, int yOffset, AdminModel model) {
   g2.setStroke(new BasicStroke(3));
   g2.setColor(model.getGroupColor(hullName));
   if (hull.size() > 2) {
     Polygon temp = new Polygon();
     for (Point p : hull) temp.addPoint(p.x - xOffset, p.y - yOffset);
     g2.draw(temp);
   } else {
     if (hull.size() == 2) {
       Line2D line = new Line2D.Double(hull.get(0), hull.get(1));
       g2.draw(line);
     }
     for (OrganismNode o : nodes)
       g2.draw(
           new Rectangle2D.Double(
               o.getX() - (1.5 + xOffset),
               o.getY() - (1.5 + yOffset),
               o.getWidth() + 3,
               o.getHeight() + 3));
   }
   g2.setStroke(new BasicStroke());
 }