resume method

void resume()

Will resume a paused internal timer or will start one now.

Implementation

void resume() {
  if (!started) {
    start();
    return;
  }
  _timer?.cancel();
  var tenthOfAFrame = 0.1 * 1000000 / fps;
  _timer = Timer.periodic(
    Duration(microseconds: tenthOfAFrame.toInt()),
    (timer) {
      update();
    },
  );
}