Coroutine in Extension Method

Question

I wrote an extension method to make an object move over time. It works well; however, because the object is performing that task over a period of time, it is ignoring all other calls, such as my update method. I am assuming I need to do something with a Coroutine, but I cannot figure out where it goes. How can I make the following code work without preventing other code (such as the Update() method) from running simulateneously? The simplified version is as follows:

==================================================================================

//The following script is attached to the GameObject
[RequireComponent(typeof(Rigidbody2D)]
public class MyBehaviour : MonoBehaviour
{
    void Start()
    {
        rigidbody2D.MoveOverTime();
    }

    void Update(){
        rigidbody2D.MovePosition(transform.position.x + 1, transform.position.y);
    }
}

==================================================================================

//The following script is not attached to anything
public static class Rigidbody2DExtension
{
    public static void MoveOverTime(this Rigidbody2D rigidbody2D)
    {
       gameObject.addComponent<MoveOverTimeComponent>();
    }
}

[RequireComponent(typeof(Rigidbody2D)]
class MoveOverTimeComponent : MonoBehaviour
{
    void Update(){
        MovePositionByALittleBit();
    }

    void MovePositionByALittleBit(){
        float x = transform.position.x + 1;
        float y = transform.position.y;
        rigidbody2D.MovePosition(new Vector2(x, y));
    }
}

Why would your `Update` method(s) be called? They're never invoked as far as I can see. — Kirk Woll, Nov 16 '14 at 19:40
@KirkWoll They are called automatically as an extension of MonoBehaviour — Evorlor, Nov 16 '14 at 19:44
@KirkWoll Honestly, I don't know. It is just a Unity thing. `Update()` is just called every frame when extending `MonoBehaviour`. `Start()` is called on creation. Creation of a `MonoBehaviour` happens when `AddComponent()` is called (like `MoveOverTimeComponent`) or it is attached in the engine (like `MyBehavior`). — Evorlor, Nov 16 '14 at 19:54

score 3 · Accepted Answer · answered Nov 16 '14 at 21:17

3

Both your Updates() are running. In fact, all the Updates() of all the MonoBehaviours will run.

Assuming that gameObject.addComponent<MoveOverTimeComponent>(); actually refers to a GameObject (which is not clear by the limited code you posted) then your problem is trying to move the same GameObject on two different Update() functions.

answered Nov 16 '14 at 21:17

apxcode

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That is my problem, thank you! I am trying to move the same `GameObject` on two different `Update()` functions. Any idea on how to allow this? – Evorlor Nov 16 '14 at 21:32
You are already moving, it just happens that you move in the same direction by same exact amount. Make one of the `Updates()` move only on the `y-axis` and the other on the `x-axis` so you can see the drastic change. – apxcode Nov 16 '14 at 21:36
I have made a brand new GameObject. It has nothing except for 2 scripts. One does this: Vector2 newPosition = new Vector2(transform.position.x + 1, transform.position.y); rigidbody2D.MovePosition(newPosition); The other does this: Vector2 newPosition = new Vector2(transform.position.x, transform.position.y + 1); rigidbody2D.MovePosition(newPosition); Only one of them is being called. I am going to need to do some research on this. – Evorlor Nov 16 '14 at 21:38
This may be of interest to you. (Or maybe not. Who knows.) But if you are curious, this is my dilemma (which you helped me realize): http://answers.unity3d.com/questions/833269/move-gameobject-with-multiple-scripts.html – Evorlor Nov 16 '14 at 21:44
I'll check it out. It might be that `MovePosition` is taking over the movement of the rigid body. It might just be that, if you run it with `AddForce` then it does work. – apxcode Nov 16 '14 at 21:48

Coroutine in Extension Method

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