iTween - what the heck is wrong here?

Unity Engine
1

I’m fairly new to Unity, so be easy on me… I’m trying to get a gameObject to tween from a position at the top of the screen to a position on the bottom, then once the tween is complete, move back to the top and do it again.

I’ve added the script to a game object and set the parameters. When I start the game, the gameObject moves to the origin and the tween proceeds to move to the specified destination, just as I expect. When the tween completes, I see the “resetAndPerformAnimation” is called too, however, the gameObject is never repositioned back to origin and subsequently, not re-tweened because apparently, it’s already in the destination.

Why doesn’t this work?

Thanks in advance.

using UnityEngine;
using System.Collections;

public class GamePieceMover : MonoBehaviour
{
public float duration;
public Vector3 origin;
public Vector3 destination;

// Use this for initialization
void Start ()
{
resetAndPerformAnimation();
}

void resetAndPerformAnimation()
{
Debug.Log(“resetAndPerformAnimation”);
gameObject.transform.position = origin;
iTween.MoveTo(gameObject,iTween.Hash(“position”,destination,“time”,duration,“easetype”,iTween.EaseType.linear,“oncomplete”,“resetAndPerformAnimation”));
}

}

2

Are you sure that iTween is calling resetAndPerformAnimation() again after it completes? Or is the call you’re seeing the one you made from Start()?

3

Yeah, I’m sure. Interestingly enough, it calls the callback every ‘duration’ seconds. iTween thinks its tweening, but the gameObject never moved back to origin.

4

This is incredibly odd. I tried a few variation of your approach and it appears there’s some sort of odd timing issue with Unity with regards to setting position. Even adding a delay to the iTween overrides your manual resetting of the position. That being said why not just utilize iTween’s loop:

using UnityEngine;
using System.Collections;

public class GamePieceMover : MonoBehaviour{
	public float duration;
	public Vector3 origin;
	public Vector3 destination;
	
	void Start(){
		transform.position=origin;
iTween.MoveTo(gameObject,iTween.Hash("position",destination,"time",duration,"looptype",iTween.LoopType.loop));
	}
}
5

I’m not sure looping will help me. This was a simplification of what I was really trying to do. At the end of each animation cycle, I need to randomize the x position in the origin and then begin the cycle again.

It definitely seems timing related. With that thought in mind, I made it delay for one second after resetting the origin and before starting the next tween, but still no luck.

I’m baffled.

6

Grab the newest version of iTween 2.0.17 and try your initial approach again. iTween was fighting your “oncomplete” callback and should work exactly how you need it to now!

http://itween.pixelplacement.com/index.php

Thanks!

7

That fixed it. Thank you!