Sprint bar

//****** Donations are greatly appreciated.  ******
//****** You can donate directly to Jesse through paypal at  https://www.paypal.me/JEtzler   ******

var curStam : float = 100.0;
var maxStam : float = 100.0;
var isSprinting : boolean = false;
var StaminaBar : Texture2D;
var staminaBarLength : float;
var percentOfStamina : float;
var stamCooldown : boolean = false;

function OnGUI () {
    GUI.DrawTexture(Rect((Screen.width/2) - 100, 10, staminaBarLength, 10), StaminaBar);
}

function Update () {

percentOfStamina = curStam/maxStam;
staminaBarLength = percentOfStamina*100;


    if(Input.GetKey("left shift") && curStam > 0 && stamCooldown == false ) {
            movement.maxForwardSpeed = 20.0;
            isSprinting = true;

        Debug.Log(movement.maxForwardSpeed);
    }

    else {
        movement.maxForwardSpeed = 10.0;
        isSprinting = false;

        Debug.Log(movement.maxForwardSpeed);

    }


    if(isSprinting == true && curStam >= 0) {
        curStam--;

    }

    if(isSprinting == false && curStam < 100.0) {
        curStam++;
    }


    if(curStam == 0) {
        stamCooldown = true;
    }

    if(curStam == 100.0) {
        stamCooldown = false;
    }
}