code: public final void stop() {
          if (this.thread != null) {
              try {
                  if (this.thread != null) {
                      this.thread.interrupt();
                      synchronized (this.thread) {
                          this.thread.notifyAll();
                      }
                  }
              } finally {
                  this.thread = null;
              }
          }
      }
docs: Stoppt das Rendern.