private static IEnumerator TweenCoroutine(ITween tween, float start, float distance, IScheduler scheduler, IObserver <float> observer, CancellationToken token)
{
while (true)
{
if (token.IsCancellationRequested)
{
observer.OnCompleted();
yield break;
}
while (scheduler.Paused)
{
yield return(null);
}
var now = scheduler.Now - start;
if (tween.CalculateFinishTime(distance) < now)
{
break;
}
observer.OnNext(tween.CalculatePosition(now, distance));
yield return(null);
}
observer.OnNext(tween.CalculatePosition(tween.CalculateFinishTime(distance), distance));
observer.OnCompleted();
}
public static Velocity CalculateStartVelocity(this ITween tween, float distance)
{
var pos1 = tween.CalculatePosition(0.0f, distance);
var pos2 = tween.CalculatePosition((float)Tweener.TIME_DELTA, distance);
return(Velocity.FromPerSecond((pos2 - pos1) * distance / Tweener.TIME_DELTA));
}
public static Velocity CalculateFinishVelocity(this ITween tween, float distance)
{
var finishTime = tween.CalculateFinishTime(distance);
var pos1 = tween.CalculatePosition(finishTime - (float)Tweener.TIME_DELTA, distance);
var pos2 = tween.CalculatePosition(finishTime, distance);
return(Velocity.FromPerSecond((pos2 - pos1) * distance / Tweener.TIME_DELTA));
}
private static IObservable <float> PlayInternal(ITween tween, float distance, IScheduler scheduler)
{
return(Observable
.Defer(() => Observable.Return(scheduler.Now))
.ContinueWith(start =>
ObservableEx.FromMicroCoroutineWithInitialValue((observer, token) => TweenCoroutine(tween, start, distance, scheduler, observer, token), tween.CalculatePosition(scheduler.Now - start, distance))
));
}