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Question by Awsomfire1234 · Mar 23, 2017 at 08:28 PM · c#programmingupdate function

Unity C# Problem

In my code, I'm trying to make a sound play once my train hits a certain speed. For example, once it hits 0.06f, play a fast moving sound. However, it just sounds broken. I believe its because its being called to fast.

How could I make it play only once, or just play once it hits 0.06f?

Here is my code:

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Movement : MonoBehaviour { public float mSpeed; public float rSpeed; public AudioSource move;

 void Start () {
     mSpeed = 0f;
     rSpeed = .0001f;
 }
 
 // Update is called once per frame
 void Update () {

             transform.Translate (-mSpeed, 0, 0);

           // Problem Area !!
     if (mSpeed <= 0.06f) 
     {
         move.Play ();
     }
           // Problem Area !!

     if (Input.GetKey ("w")) 
     {
         mSpeed += rSpeed;
     }

     if (Input.GetKey ("s")) 
     {
         mSpeed += -rSpeed;
     }
 }

}

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Answer by UnityCoach · Mar 23, 2017 at 08:41 PM

You want to use a property for that, it's the best way to trigger things only when a value changes.

 private float _mSpeed;
 public float mSpeed
 {
     get { return _mSpeed; }
     set
     {
         if (value != _mSpeed) // if value changed
         {
             if (_mSpeed <= 0.06f && value > 0.06f) // if previous value is less than and new value is greater than 0.06
             {
                 move.Play ();
             }
             _mSpeed = value;
         }
     }
 }
 
 void Update ()
 {
     transform.Translate (-mSpeed, 0, 0);
     if (Input.GetKey ("w")) 
     {
         mSpeed += rSpeed;
     }
     if (Input.GetKey ("s")) 
     {
         mSpeed += -rSpeed;
     }
  }
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avatar image Awsomfire1234 · Mar 23, 2017 at 08:51 PM 0
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Thanks for the reply! Could you explain where or how I should place it. I'm not the best at C#.

avatar image UnityCoach Awsomfire1234 · Mar 23, 2017 at 10:34 PM 0
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Sure, at the root of the $$anonymous$$onoBehaviour. When in Update you change mSpeed, it will call the set method of the accessor, which will trigger the mechanics.

avatar image Awsomfire1234 UnityCoach · Mar 23, 2017 at 11:35 PM 0
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I still can't figure it out. Sorry. Here is my entire script. Could you point out what I am doing wrong?

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class $$anonymous$$ovement : $$anonymous$$onoBehaviour { private float _mSpeed; public float mSpeed; public float rSpeed; public AudioSource Horn; public AudioSource move; public AudioSource Bell; public bool BellOn;

{ get {return _mSpeed;} set { if (value !- _mSpeed) { if(_mSpeed <= 0.06f && value > 0.06f)

             {
                 move.Play ();
             }
             _mSpeed = value;
         }
     }
 }

 void Start () {

     BellOn = false;
     mSpeed = 0f;
     rSpeed = .0001f;
 }
 

 void Update () {

     transform.Translate (-mSpeed, 0, 0);


     if (Input.Get$$anonymous$$ey ("w")) 
     {
         mSpeed += rSpeed;
     }

     if (Input.Get$$anonymous$$ey ("s")) 
     {
         mSpeed += -rSpeed;
     }

     if (Input.Get$$anonymous$$ey ("h")) 
     {
         Horn.Play ();
     }

     if (Input.Get$$anonymous$$eyDown ("b")) 
     {
         if (BellOn == true) 
         {
             Bell.Stop ();
             BellOn = false;
         }
         else if (BellOn == false) 
         {
             Bell.Play ();
             BellOn = true;
         } 

     }
 }

}

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avatar image Awsomfire1234 · Mar 23, 2017 at 11:45 PM 0
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It worked, thanks!

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