code: public void remove(Paintable paintable, Object group) {
  		String className = paintable.getClass().getName();
  		if (painters.containsKey(className)) {
  			List<Painter> list = painters.get(className);
  			for (Painter painter : list) {
  				painter.deleteShape(paintable, group, context);
  			}
  		}
  	}
docs: Remove a paintable object from the graphics.
  
  @param paintable paintable object
  @param group group to draw