@Override
 			           public void handle(MouseEvent e) {
 			        	   int index = insideCircle(e.getX(), e.getY());
 			        	   if(index >= 0){
 			        		   centers.remove(index);
 			        	   }
 			        	   addCircle((int)e.getX(),(int)e.getY());
 			           }