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Question by magnusm · Jul 11, 2013 at 03:36 PM · javascriptfunction

Calling A Function When A Variable Changes? Help

Hi :)

I am trying to make a script that plays a sound when any of the keys 'W,A,S,D' are held down, and stops it once all the keys a released.

Here's my script so far:


 var jetSoundOn : boolean;
 
 function Update ()
 
 {
 
 if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.D))
 
     {
         jetSoundOn = true;
         audio.Play();
     }
     
     else
     {
         jetSoundOn = false;
         audio.Stop();
     }
 }


The problem is that the sound is being replayed every frame, as its in the Update function. Which makes it sound fricking terrible.

Is there anyway I can make it only call a function (to make it play/stop the sound) when the jetSoundOn variable is changed?

In Lua I think you can use "OnChanged" which would do the job nicely. But I have no idea what to do here :S

Thanks for your help :)

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Answer by DavidDebnar · Jul 11, 2013 at 03:38 PM

 var jetSoundOn : boolean;
 
 function Update () {
     if(Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.D)) {
          if(!jetSoundOn) {
             jetSoundOn = true;
             audio.Play();
         }
     }
     else if(jetSoundOn) {
         jetSoundOn = false;
         audio.Stop();
     }
 }

--David--

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avatar image magnusm · Jul 11, 2013 at 03:57 PM 0
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Worked perfectly, thanks man! Also found out how to use "!" which is a bonus :)

avatar image DavidDebnar · Jul 11, 2013 at 04:13 PM 0
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No problem, I'm glad I could help. :)

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