How Tween System actually working?

Hello for everyone.

I trying to understand how to determine if some entity has active tweener.

I have tried to use the following code:

Code (JavaScript):

1. if (this.world.hasComponent(entity, ut.Tweens.TweenComponent)) {
2.     ...
3. }

But it seems it doesn't working.

The documentation for ut.Tweens.TweenService.addTween() says:

Code (JavaScript):

1. Creates a new tweening entity with a TweenFloat component and a TweenComponent component.
2. This a helper function that does the following:
3. e = createEntity
4. addComponent(e,TweenFloat)
5. addComponent(e,TweenComponent)

So, it looks like I should check some another [created] entity for TweenComponent presence.

Anyone know, how to get reference to such entity?

Maybe, there are some another ways to determine if animation is active for entity?
And, yes, I know about Watchers. Unfortunately, low FPS on some mobile devices may leads to animation can be stopped on some middle point between minimal and maximal values.

 

Oh, I'm sorry, guys, I get the point:

Code (JavaScript):

1. this.tweenEntity = ut.Tweens.TweenService.addTween(
2.                 this.world, this.animatingEntity,
3.                 this.field,
4.                 this.startValue, this..endValue,
5.                 this.duration, this.delay,
6.                 ut.Core2D.LoopMode.Loop,
7.                 this.tweenType,
8.                 true); // auto-destroy on complete
9.  
10. ...
11.  
12. if (this.tweenEntity.isNone()) {
13.     // animation is completed
14. }

 

How Tween System actually working in C# now ? I add tween, but build failed.

new TweenSystem().AddTween<Translation>(entity, null, pos, endPos, 5);

What is "FieldInfo" and where get it?

 

To start a tween on the Translation component in C#:

Code (CSharp):

1. var tweenSystem = World.GetExistingSystem<TweenSystem>();
2. tweenSystem.AddTween(entity,
3.     "Translation.Value",
4.     new float3(0f, 0f, 0f),
5.     new float3(10f, 0f, 0f),
6.     1.0f,
7.     TweenFunc.Linear,
8.     LoopMode.Loop);

 

thanks a lot for this sample