Stamina Bar Help

I modified the script a little as I never tested it for that answer, and found some strange things happening with the sprint timer going out of bounds.

Now there is a line in the function SetSpeed that clamps the sprint timer :

 sprintTimer = Mathf.Clamp( sprintTimer, 0, sprintDuration );

When I say create a normalized value, this means create a value between 0 and 1 that represents the percentage of stamina available. With this percentage, you can modify another value to represent that percentage, eg :

 stamina = sprintTimer / sprintDuration;

You can use this value in the width of the GUI bar :

 GUI.DrawTexture( Rect( 30, Screen.height - 80, 400 * stamina, 50 ), staminaTexture );

so if stamina is full, the width will be 400; if the stamina is empty, the width will be 0.

but the sprint timer is backwards (max when no stamina, 0 when full stamina), so the stamina line needs to be inverted :

 stamina = 1.0 - ( sprintTimer / sprintDuration );

Since I have modified a few things in the original script, here is the complete code with a stamina bar GUI texture included :

 //------------------------------//
 //  Footsteps.js                //
 //  Written by Alucard Jay      //
 //  4/11/2014                   //
 //------------------------------//
 
 #pragma strict
 @script RequireComponent( AudioSource )
 
 public var walkSounds : AudioClip[];
 public var runSounds : AudioClip[];
 
 public var walkAudioSpeed : float = 0.4;
 public var runAudioSpeed : float = 0.2;
 
 private var walkAudioTimer : float = 0.0;
 private var runAudioTimer : float = 0.0;
 
 var isWalking : boolean = false; // these can be private
 var isRunning : boolean = false; // these can be private
 
 public var walkSpeed : float = 8; // regular speed
 public var runSpeed : float = 20; // run speed
 
 public var sprintDuration : float = 10.0;
 private var sprintTimer : float = 0;
 private var stamina : float = 0.0;
 
 public var staminaTexture : Texture;
 
 private var chCtrl: CharacterController;
 private var chMotor: CharacterMotor;
 
 function Start()
 {
     chCtrl = GetComponent(CharacterController);
     chMotor = GetComponent(CharacterMotor);
 }
 
 function Update()
 {
     SetSpeed();
 
     if ( chCtrl.isGrounded )
     {
         PlayFootsteps();
     }
     else
     {
         walkAudioTimer = 1000.0;
         runAudioTimer = 1000.0;
     }
 }
 
 function SetSpeed()
 {
     var speed = walkSpeed;
 
     if ( Input.GetAxis( "Horizontal" ) || Input.GetAxis( "Vertical" ) )
     {
         if ( Input.GetKey( "left shift" ) || Input.GetKey( "right shift" ) )
         {
             // Running
             isWalking = false;
             isRunning = true;
         }
         else
         {
             // Walking
             isWalking = true;
             isRunning = false;
         }
     }
     else
     {
         // Stopped
         isWalking = false;
         isRunning = false;
     }
 
     // check the sprint timer
     if ( isRunning )
     {
         sprintTimer += Time.deltaTime;
 
         if ( sprintTimer > sprintDuration )
         {
             isRunning = false;
             isWalking = true;
         }
         else if ( chCtrl.isGrounded )
         {
             speed = runSpeed;
         }
     }
     else
     {
         sprintTimer -= Time.deltaTime;
     }
     
     sprintTimer = Mathf.Clamp( sprintTimer, 0, sprintDuration );
 
     chMotor.movement.maxForwardSpeed = speed;
 
     stamina = 1.0 - ( sprintTimer / sprintDuration );
 }
 
 function PlayFootsteps()
 {
     // Play Audio
     if ( isWalking )
     {
         if ( walkAudioTimer > walkAudioSpeed )
         {
             audio.Stop();
             audio.clip = walkSounds[ Random.Range( 0, walkSounds.Length ) ];
             audio.Play();
             walkAudioTimer = 0.0;
         }
     }
     else if ( isRunning )
     {
         if ( runAudioTimer > runAudioSpeed )
         {
             audio.Stop();
             audio.clip = runSounds[ Random.Range( 0, runSounds.Length ) ];
             audio.Play();
             runAudioTimer = 0.0;
         }
     }
     else
     {
         audio.Stop();
     }
 
     // increment timers
     walkAudioTimer += Time.deltaTime;
     runAudioTimer += Time.deltaTime;
 }
 
 function OnGUI()
 {
     if ( staminaTexture ) // check there is a texture so it doesn't error if not
     {
         GUI.DrawTexture( Rect( 30, Screen.height - 80, 400 * stamina, 50 ), staminaTexture );
     }
 }