/// <summary>
/// Runs one step of simulation. This is called by the Thread Timer
/// </summary>
/// <param name="state">Needed to conform to timercall back delegate, not used</param>
private void DoSimulation(object state)
{
if (Monitor.TryEnter(lockObject, targetDeltaTime / 2))
{
try
{
// Do work
if (scene != null)
{
IList <Entity> rootEntity = scene.RootEntities;
simTime.FrameStart();
//Do keyframing
KeyframeEngine.Step();
//Update behaviours
PreUpdateScenegraphChildren(rootEntity);
UpdateScenegraphChildren(rootEntity);
PostUpdateScenegraphChildren(rootEntity);
simTime.FrameEnd();
//Calculate timing
//Debug.WriteLine("DeltaTime:" + simTime.DeltaTime);
//Notify about a finished simulation step
TriggerStepFinished();
}
}
finally
{
Monitor.Exit(lockObject);
}
}
}
/// <summary>
/// Constructs a new engine instance
/// </summary>
/// <param name="scene">Scenegraph to use for simulations</param>
public SimulationEngine(SceneGraph scene)
{
this.scene = scene;
this.simTime = new SimulationTime();
this.simulateStepTimer = new Timer(new TimerCallback(DoSimulation), null, Timeout.Infinite, targetDeltaTime);
updatesPerSecond = 30;
targetDeltaTime = 1000 / updatesPerSecond;
lastDeltaTime = targetDeltaTime;
this.keyframeExecutor = new KeyframeEngine();
}
/// <summary>
/// Instantiates a new timeline viewmodel
/// </summary>
public TimelineViewModel(ITinyMessengerHub messenger, KeyframeEngine engine)
{
NotifyPropertyUpdateRate = 50;
TimelineStart = 0;
TimelineEnd = 100;
Messenger = messenger;
//Set up engine
Engine = engine;
Engine.CurrentTimeChanged += Engine_CurrentTimeChanged;
//SetTimeLine(Engine.Keyframes);
//MessengerInstance.Register<SelectedNodeChanged>(this, ActiveNodeChanged);
//MessengerInstance.Register<ActiveTimelineChanged>(this, TimelineChanged);
Messenger.Subscribe <SelectedEntityChanged>(ActiveEntityChanged);
Messenger.Subscribe <InvalidateEntity>(OnInvalidateEntitiesMessage);
AddKeyframeCommand = new RelayCommand(CaptureKeyframes, CanCaptureKeyframes);
Keyframes = new ObservableCollection <KeyframeViewModel>();
playPauseCommand = new RelayCommand(TogglePlayPauseState);
}
public static void Send(KeyframeTimeline timeline, KeyframeEngine engine)
{
Messenger.Default.Send <ActiveTimelineChanged>(new ActiveTimelineChanged(timeline, engine));
}
private ActiveTimelineChanged(KeyframeTimeline timeline, KeyframeEngine engine)
{
this.Timeline = timeline;
Engine = engine;
}
