/// <summary>
/// Returns an observable that calls on next when persons enter the scene or leave the scene.
/// </summary>
/// <param name="kinectSensor">The kinect sensor.</param>
/// <returns>The observable sequence.</returns>
public static IObservable <SceneChangedEventArgs> SceneChanges(this KinectSensor kinectSensor)
{
// TODO: Hack, In update 06 2014 the BodyCount property was removed on BodyFrameSource.
var bodiesInScene = new Dictionary <ulong, Body>(6);
Body[] bodies = null;
return(Observable.Create <SceneChangedEventArgs>(observer =>
{
return kinectSensor.BodyFrameArrivedObservable()
.SelectBodies(bodies)
.Subscribe(bs =>
{
bs.Where(b => b != null && b.IsTracked)
.Where(b => bodiesInScene.ContainsKey(b.TrackingId) == false) // were not yet in scene
.ForEach(b =>
{
bodiesInScene.Add(b.TrackingId, b);
observer.OnNext(new SceneChangedEventArgs(new PersonEnteredScene(b.TrackingId)));
});
var toRemove = bodiesInScene.Keys
.Except(bs.Select(b => b.TrackingId))
.ToList();
toRemove.ForEach(_ =>
{
bodiesInScene.Remove(_);
observer.OnNext(new SceneChangedEventArgs(new PersonLeftScene(_)));
});
},
e => observer.OnError(e),
() => observer.OnCompleted());
}));
}
/// <summary>
/// Converts the BodyFrameArrived event to an observable sequence.
/// </summary>
/// <param name="kinectSensor">The kinect sensor.</param>
/// <returns>The observable sequence.</returns>
public static IObservable <BodyFrameArrivedEventArgs> BodyFrameArrivedObservable(this KinectSensor kinectSensor)
{
if (kinectSensor == null)
{
throw new ArgumentNullException("kinectSensor");
}
return(Observable.Create <BodyFrameArrivedEventArgs>(observer =>
{
var reader = kinectSensor.BodyFrameSource.OpenReader();
var disposable = kinectSensor.BodyFrameArrivedObservable(reader)
.Subscribe(x => observer.OnNext(x),
e => observer.OnError(e),
() => observer.OnCompleted());
return new CompositeDisposable {
disposable, reader
};
}));
}
