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Question by ciwiaf · Apr 18, 2015 at 12:23 PM · script.valuepassingpowerbar

Instantly pass other script's variable value to another.

Hi, I'm trying to pass a variable value from one script to another, but it seems that it's passing it too late or I may have other problems. I'm still learning Unity and C# so forgive my ignorance :). Anyway, I'm trying to make one code that will start a "power meter" when you press and hold Mouse1, and another code that will make the character jump when you release Mouse1, depending on the value of the "power meter".

Here's the code attached to my power meter.

     void Update () {
 
         if (Input.GetMouseButtonDown(0) && (startMeter == 0)) {
             barStart = true;
             startMeter = 1;
         }
         if (Input.GetMouseButtonUp(0) && (startJump == 0) && barStart) {
             barStart = false;
             startJump = 1;
         }
         if(barStart && !maxJump){
             jumpPower += Time.deltaTime * barSpeed;
             jumpPower = Mathf.Clamp(jumpPower, minWidth, fullWidth);
             powerBar.pixelInset = new Rect (transform.localPosition.x, transform.localPosition.y, 20, jumpPower);
             if(jumpPower == 256){
                 maxJump = true;
             }
         }
         if(barStart && maxJump){
             jumpPower -= Time.deltaTime * barSpeed;
             jumpPower = Mathf.Clamp(jumpPower, 0, fullWidth);
             powerBar.pixelInset = new Rect (transform.localPosition.x, transform.localPosition.y, 20, jumpPower);
             if(jumpPower == 0){
                 maxJump = false;
             }
         }
         
     }


And here's the other one attached to the player:

 public PowerMeter jumpForce;
 
     void Update () {
 
         if (Input.GetMouseButtonUp(0) && grounded && (jumpForce.startJump == 1)) {
             GetComponent<Rigidbody2D>().velocity = new Vector3(0,0,0);
             GetComponent<Rigidbody2D>().AddForce (new Vector2(-3,(jumpForce.jumpPower/7)), ForceMode2D.Impulse);
             GetComponent<Rigidbody2D>().mass = 2;
             Destroy(GameObject.FindWithTag("PowerMeter"));
             //jumpForce.startJump = 0;
         }


whenever I let go of the Mouse1, the player would ignore the value set by the power meter (jumpPower variable). but when I press and release mouse1 again, the player would finally jump based on the value in the jumpPower.

I'm stuck, any help is appreciated.

Thanks :)

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Answer by vargata · Apr 18, 2015 at 02:36 PM

it would be better to call a jump function on the player from the powermeter's script instead of using the update twice. its more reliable and you can pass parameters.

 var playerObject : gameObject
 
 function Update(){
   var playerScript = playerObject.GetComponent(jumpScript);
 
   if (Input.GetMouseButtonUp(0) && (startJump == 0) && barStart) {
     barStart = false;
     playerScript.forceJump(jumpPower);
   }
 }

and add this to the player:

 function forceJump(jumpPower : float)
 {
    if (grounded)
    {
          GetComponent<Rigidbody2D>().velocity = Vector3(0,0,0);
          GetComponent<Rigidbody2D>().AddForce (Vector2(-3,(jumpPower/7)), ForceMode2D.Impulse);
          GetComponent<Rigidbody2D>().mass = 2;
          Destroy(GameObject.FindWithTag("PowerMeter"));
    }
 }
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avatar image ciwiaf · Apr 19, 2015 at 06:29 AM 0
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Though I ended up changing my whole code a bit, I use this advice of yours, so I marked this as an answer. Thanks! :)

avatar image tanoshimi · Apr 19, 2015 at 09:00 AM 0
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@ciwiaf - you haven't marked this as the answer... click the tick button :)

avatar image ciwiaf · Apr 19, 2015 at 10:38 AM 0
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Oh, I thought I already did, haha.. Done!

avatar image vargata · Apr 19, 2015 at 12:57 PM 0
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glad that it helped you, good luck with your project :)

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Answer by DiegoSLTS · Apr 18, 2015 at 12:57 PM

It might be a problem with the order of execution. Both functions are "Update" functions, and Unity will always execute one before the other. The problem is you can't (and shouldn't) force a certain order, so maybe the Update for your second script is runing before the Update from the first script.

You can try using a different update function, you also have FixedUpdate that runs before all Update functions, and LateUpdate that runs after all Update functions. Look here for more details: http://docs.unity3d.com/Manual/ExecutionOrder.html

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avatar image ciwiaf · Apr 19, 2015 at 06:29 AM 0
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yea, this is what I was thinking about before, but, I've tried those 3 Update, still got the same result.

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