Need help with my health bar script

Unity Engine
1

Hello everyone, i’m following a small tutorial that covers basics but not too much detail. I have a script here that has a working health bar, water/food, and stamina system. My question is does anyone know how I could make my health bar go down from getting hit by enemies rather than just dying of starvation or thirst. Here’s the script, all help is appreciated.

#pragma strict

//Size of Textures

var size : Vector2 = new Vector2(240, 40);

//Health Variables
var healthPos : Vector2 = new Vector2(20, 20);
var healthBarDisplay : float = 1;
var healthBarEmpty : Texture2D;
var healthBarFull : Texture2D;

//Hunger Variables
var hungerPos : Vector2 = new Vector2(20, 60);
var hungerBarDisplay : float = 1;
var hungerBarEmpty : Texture2D;
var hungerBarFull : Texture2D;

//Thirst Variables
var thirstPos : Vector2 = new Vector2(20, 100);
var thirstBarDisplay : float = 1;
var thirstBarEmpty : Texture2D;
var thirstBarFull : Texture2D;

//Stamina Variables
var staminaPos : Vector2 = new Vector2(20, 140);
var staminaBarDisplay : float = 1;
var staminaBarEmpty : Texture2D;
var staminaBarFull : Texture2D;

//Fall Rate
var healthFallRate : int = 150;
var hungerFallRate : int = 200;
var thirstFallRate : int = 200;
var staminaFallRate : int = 40;

private var chMotor : CharacterMotor;
private var controller : CharacterController;

var canJump : boolean = false;

var jumpTimer : float = 0.7;

function Start()
{
    chMotor = GetComponent(CharacterMotor);
    controller = GetComponent(CharacterController);
}

function OnGUI()
{
    //Health GUI
    GUI.BeginGroup(new Rect (healthPos.x, healthPos.y, size.x, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), healthBarEmpty);

    GUI.BeginGroup(new Rect (0, 0, size.x * healthBarDisplay, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), healthBarFull);

    GUI.EndGroup();
    GUI.EndGroup();

    //Hunger GUI
    GUI.BeginGroup(new Rect (hungerPos.x, hungerPos.y, size.x, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), hungerBarEmpty);

    GUI.BeginGroup(new Rect (0, 0, size.x * hungerBarDisplay, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), hungerBarFull);

    GUI.EndGroup();
    GUI.EndGroup();

    //Thirst GUI
    GUI.BeginGroup(new Rect (thirstPos.x, thirstPos.y, size.x, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), thirstBarEmpty);

    GUI.BeginGroup(new Rect (0, 0, size.x * thirstBarDisplay, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), thirstBarFull);

    GUI.EndGroup();
    GUI.EndGroup();

    //Stamina GUI
    GUI.BeginGroup(new Rect (staminaPos.x, staminaPos.y, size.x, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), staminaBarEmpty);

    GUI.BeginGroup(new Rect (0, 0, size.x * staminaBarDisplay, size.y));
    GUI.Box(Rect(0, 0, size.x, size.y), staminaBarFull);

    GUI.EndGroup();
    GUI.EndGroup();
}

function Update()
{
    //HEALTH CONTROL SECTION
    if(hungerBarDisplay <= 0 && (thirstBarDisplay <= 0))
    {
        healthBarDisplay -= Time.deltaTime / healthFallRate * 2;
    }

    else
    {
        if(hungerBarDisplay <= 0 || thirstBarDisplay <= 0)
        {
            healthBarDisplay -= Time.deltaTime / healthFallRate;
        }
    }

    if(healthBarDisplay <= 0)
    {
        CharacterDeath();
    }

    //HUNGER CONTROL SECTION
    if(hungerBarDisplay >= 0)
    {
        hungerBarDisplay -= Time.deltaTime / hungerFallRate;
    }

    if(hungerBarDisplay <= 0)
    {
        hungerBarDisplay = 0;
    }

    if(hungerBarDisplay >= 1)
    {
        hungerBarDisplay = 1;
    }

    //THIRST CONTROL SECTION
    if(thirstBarDisplay >= 0)
    {
        thirstBarDisplay -= Time.deltaTime / thirstFallRate;
    }

    if(thirstBarDisplay <= 0)
    {
        thirstBarDisplay = 0;
    }

    if(thirstBarDisplay >= 1)
    {
        thirstBarDisplay = 1;
    }

    //STAMINA CONTROL SECTION
    if(controller.velocity.magnitude > 0 && Input.GetKey(KeyCode.LeftShift))
    {
        chMotor.movement.maxForwardSpeed = 15;
        chMotor.movement.maxSidewaysSpeed = 15;
        staminaBarDisplay -= Time.deltaTime / staminaFallRate;
    }

    else
    {
        chMotor.movement.maxForwardSpeed = 10;
        chMotor.movement.maxSidewaysSpeed = 10;
        staminaBarDisplay += Time.deltaTime / staminaFallRate;
    }

    //JUMPING SECTION
    if(Input.GetKeyDown(KeyCode.Space) && canJump == true)
    {
        staminaBarDisplay -= 0.04;
        Wait();
    }

    if(canJump == false)
    {
        jumpTimer -= Time.deltaTime;
        chMotor.jumping.enabled = false;
    }

    if(jumpTimer <= 0)
    {
        canJump = true;
        chMotor.jumping.enabled = true;
        jumpTimer = 0.7;
    }

    //COMMENTED THESE SECTIONS OUT - UPDATED 16/07/14
    //if(staminaBarDisplay <= 0.05)
    //{
        //canJump = false;
        //chMotor.jumping.enabled = false;
    //}

    //else
    //{
        //canJump = true;
        //chMotor.jumping.enabled = true;
    //}

    if(staminaBarDisplay >= 1)
    {
        staminaBarDisplay = 1;
    }

    if(staminaBarDisplay <= 0)
    {
        //ADDED line 181 here!
        staminaBarDisplay = 0;
        canJump = false;
        chMotor.jumping.enabled = false;
        chMotor.movement.maxForwardSpeed = 6;
        chMotor.movement.maxSidewaysSpeed = 6;
    }
}

function CharacterDeath()
{
    Application.LoadLevel("SIMPLELEVEL");
}

function Wait()
{
    yield WaitForSeconds(0.1);
    canJump = false;
}
2

I should probably add this is my enemy damage script

//IMPORTANT NOTE! THIS SCRIPT WAS MADE IN VIDEO NUMBER 21! CHECK OUT THE EARLIER VERSION (NOT V2) IF YOU HAVEN'T REACHED THAT VIDEO.

var Distance;
var Target : Transform;
var lookAtDistance = 25.0;
var chaseRange = 15.0;
var attackRange = 1.5;
var moveSpeed = 5.0;
var Damping = 6.0;
var attackRepeatTime = 1;

var TheDammage = 40;

private var attackTime : float;

var controller : CharacterController;
var gravity : float = 20.0;
private var MoveDirection : Vector3 = Vector3.zero;

function Start ()
{
    attackTime = Time.time;
}

function Update ()
{
    if(RespawnMenuV2.playerIsDead == false)
    {
        Distance = Vector3.Distance(Target.position, transform.position);
       
        if (Distance < lookAtDistance)
        {
            lookAt();
        }
       
        if (Distance > lookAtDistance)
        {
            renderer.material.color = Color.green;
        }
       
        if (Distance < attackRange)
        {
            attack();
        }
        else if (Distance < chaseRange)
        {
            chase ();
        }
    }
}

function lookAt ()
{
    renderer.material.color = Color.yellow;
    var rotation = Quaternion.LookRotation(Target.position - transform.position);
    transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * Damping);
}

function chase ()
{
    renderer.material.color = Color.red;
   
    moveDirection = transform.forward;
    moveDirection *= moveSpeed;
   
    moveDirection.y -= gravity * Time.deltaTime;
    controller.Move(moveDirection * Time.deltaTime);
}

function attack ()
{
    if (Time.time > attackTime)
    {
        Target.SendMessage("ApplyDammage", TheDammage);
        Debug.Log("The Enemy Has Attacked");
        attackTime = Time.time + attackRepeatTime;
    }
}

function ApplyDammage ()
{
    chaseRange += 30;
    moveSpeed += 2;
    lookAtDistance += 40;
}