Stream<num> timespan(num time)

Returns a Stream of relative time which fires for time seconds.

The stream returns the relative time since the start of the method. The stream ends automatically after time seconds.

This method is based on the onElapsedTimeChange stream and is therefore executed before all other animatables.

await for (var time in juggler.timespan(2.0)) {
  print(time);
}

var stream = juggler.timespan(2.0).map((time) => 2.0 * time);
stream.listen((value) => print(value));

Source 

Stream<num> timespan(num time) async* {
  var startTime = this.elapsedTime;
  await for (var elapsedTime in this.onElapsedTimeChange) {
    var currentTime = elapsedTime - startTime;
    var clampedTime = currentTime < time ? currentTime : time;
    yield clampedTime;
    if (currentTime >= time) break;
  }
}