[part 4] hearts don’t decrease on hit

[Niyam Shah]

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my hearts appear on the HUD in the top left corner. i have 10 visible hearts now(how do i change this?) my main issue is that my hearts dont decrease when i take damage.

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    [Header("Horizontal Movement Settings")]
    [SerializeField] private float walkSpeed = 1;
    [Space(5)]

    [Header("Dash Settings")]
    [SerializeField] private float dashSpeed;
    [SerializeField] private float dashTime;
    [SerializeField] private float dashCooldown;
    [SerializeField] GameObject dashEffect;
    private bool canDash = true;
    private bool dashed;
    [Space(5)]

    [Header("Vertical Movement Settings")]
    [SerializeField] private float jumpForce = 45;
    private int jumpBufferCounter = 0;
    [SerializeField] private int jumpBufferFrames;
    private float coyoteTimeCounter = 0;
    [SerializeField] private float coyoteTime;
    [SerializeField] private float airJumpsCounter = 0;
    [SerializeField] private int maxAirJumps;
    [Space(5)]

    [Header("recoil")]
    [SerializeField] int recoilXSteps = 5;
    [SerializeField] int recoilYSteps = 5;
    [SerializeField] float recoilXSpeed = 100; 
    [SerializeField] float recoilYSpeed = 100;
    private int stepsXRecoiled, stepsYRecoiled;
    [Space(5)]

    [Header("Attack Settings")]
    private bool attack = false;
    private float timeBetweenAttack, timeSinceAttack;
    [SerializeField] Transform SideAttackTransform, BehindAttackTransform, UpAttackTransform, DownAttackTransform;
    [SerializeField] Vector2 SideAttackArea, BehindAttackArea, UpAttackArea, DownAttackArea;
    [SerializeField] LayerMask attackableLayer;
    [SerializeField] float damage;
    [SerializeField] GameObject slashEffect;
    bool restoreTime;
    float restoreTimeSpeed;
    [Space(5)]

    [Header("Ground Check Settings")]
    [SerializeField] private Transform groundCheckPoint;
    [SerializeField] private float groundCheckY = 0.2f;
    [SerializeField] private float groundCheckX = 0.5f;
    [SerializeField] private LayerMask whatIsGround;
    [Space(5)]

    [Header("Health")]
    public int health;
    public int maxHealth;
    [SerializeField] GameObject bloodSpurt;
    [SerializeField] float hitFlashSpeed;
    public delegate void OnHealthChangedDelegate(); // delegate voids can be used on multiple methods
    [HideInInspector] public OnHealthChangedDelegate onHealthChangedCallBack;
    [Space(5)]

    [HideInInspector] public playerStatesList pState;

    private float xAxis, yAxis;
    private Rigidbody2D rb;
    private float gravity;
    private Animator anim;
    private SpriteRenderer sr;





    public static PlayerController Instance;

    private void Awake()
    {
        if(Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
        }

        Health = maxHealth;
    }



    // Start is called before the first frame update
    void Start()
    {
        pState = GetComponent<playerStatesList>();

        rb = GetComponent<Rigidbody2D>();

        anim = GetComponent<Animator>();

        sr = GetComponent<SpriteRenderer>();

        gravity = rb.gravityScale;

    }



    //draw out hitboxes for basic attacks
    private void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireCube(SideAttackTransform.position, SideAttackArea);
        Gizmos.DrawWireCube(BehindAttackTransform.position, BehindAttackArea);
        Gizmos.DrawWireCube(UpAttackTransform.position, UpAttackArea);
        Gizmos.DrawWireCube(DownAttackTransform.position, DownAttackArea);
    }



    // Update is called once per frame
    void Update()
    {
        GetInputs();
        updateJumpVariable();

        if (pState.dashing) return;
        Flip();
        Move();
        Jump();
        StartDash();
        Attack();
        RestoreTimeScale();
        FlashWhileInvincible();
    }

    private void FixedUpdate()
    {
        if(pState.dashing) return;
        Recoil();
    }

    //basic inputs for movement
    void GetInputs()
    {
        xAxis = Input.GetAxisRaw("Horizontal");
        yAxis = Input.GetAxisRaw("Vertical");
        attack = Input.GetButtonDown("Attack");
    }



    // flip player on x axis when left or right is picked
    void Flip()
    {
        if(xAxis < 0)
        {
            transform.localScale = new Vector2(-1, transform.localScale.y);
            pState.lookingRight = false;
        }

        else if(xAxis > 0)
        {
            transform.localScale = new Vector2(1, transform.localScale.y);
            pState.lookingRight = true;
        }


    }



    //move left and right
    private void Move()
    {
        rb.velocity = new Vector2(walkSpeed * xAxis, rb.velocity.y);
        anim.SetBool("walking", rb.velocity.x != 0 && Grounded());
    }



    //allows for dashing and air dashing
    void StartDash()
    {
        if(Input.GetButtonDown("Dash") && canDash && !dashed)
        {
            StartCoroutine(Dash());
            dashed = true;
        }

        if (Grounded())
        {
            dashed = false;
        }
    }
    //stops middair infinite dashing
    IEnumerator Dash()
    {
        canDash = false;

        pState.dashing = true;

        anim.SetTrigger("Dashing");

        rb.gravityScale = 0;

        rb.velocity = new Vector2(transform.localScale.x * dashSpeed, 0);
        if (Grounded()) Instantiate(dashEffect, transform);

        yield return new WaitForSeconds(dashTime);

        rb.gravityScale = gravity;

        pState.dashing = false;

        yield return new WaitForSeconds(dashCooldown);

        canDash = true;
    }



    //create hitboxes for attacks
    void Attack()
    {
        timeSinceAttack += Time.deltaTime;
        if(attack && timeSinceAttack >= timeBetweenAttack)
        {

            timeSinceAttack = 0;


            //side attack
            if (yAxis == 0 || yAxis < 0 && Grounded())
            {
                Hit(SideAttackTransform, SideAttackArea, ref pState.recoilingx, recoilXSpeed);
                Instantiate(slashEffect, SideAttackTransform);
                anim.SetTrigger("Attacking");

            }

            //up air attack
            else if (yAxis > 0 && !Grounded())
            {
                Hit(UpAttackTransform, UpAttackArea, ref pState.recoilingy, recoilYSpeed);
                SlashEffectAtAngle(slashEffect, 80, UpAttackTransform);
                anim.SetTrigger("Attacking");
            }

            //down air attak
            else if (yAxis < 0 && !Grounded())
            {
                Hit(DownAttackTransform, DownAttackArea, ref pState.recoilingy, recoilYSpeed);
                SlashEffectAtAngle(slashEffect, -80, DownAttackTransform);
                anim.SetTrigger("Attacking");
            }

            if (yAxis > 0 && Grounded())
            {
                Hit(UpAttackTransform, UpAttackArea, ref pState.recoilingy, recoilYSpeed);
                SlashEffectAtAngle(slashEffect, 95, UpAttackTransform);
                anim.SetTrigger("upAttack");
            }
        }

    }



    //hitting the enemy and adding recoil to attacks
    void Hit(Transform _attackTransform, Vector2 _attackArea, ref bool _recoilDir, float _recoilStrength)
    {
        Collider2D[] objectsToHit = Physics2D.OverlapBoxAll(_attackTransform.position, _attackArea, 0, attackableLayer);

        if(objectsToHit.Length > 0)
        {
            _recoilDir = true;  
        }

        for(int i = 0; i < objectsToHit.Length; i++)
        {
            if (objectsToHit[i].GetComponent<Enemy>() != null)
            {
                objectsToHit[i].GetComponent<Enemy>().EnemyHit
                    (damage, (transform.position - objectsToHit[i].transform.position).normalized, _recoilStrength);
            }
        }
    }



    //changes the direction of attack based on aerial positions
    void SlashEffectAtAngle(GameObject _slashEffect, int _effectAngle, Transform _attackTransform)
    {
        _slashEffect = Instantiate(_slashEffect, _attackTransform);
        _slashEffect.transform.eulerAngles = new Vector3(0, 0, _effectAngle);
        _slashEffect.transform.localScale = new Vector2(transform.localScale.x, transform.localScale.y);
    }



    //directional player recoil based on main slash attacks, x and y axis movement
    void Recoil()
    {
        //recoiling in the x axis
        if (pState.recoilingx)
        {
            if (pState.lookingRight)
            {
                rb.velocity = new Vector2(-recoilXSpeed, 0);
            }
            else
            {
                rb.velocity = new Vector2(recoilXSpeed, 0);
            }
        }

        //recoil in the y axis
        if (pState.recoilingy)
        {
            rb.gravityScale = 0;
            if (yAxis < 0)
            {
                rb.velocity = new Vector2(rb.velocity.x, recoilYSpeed);
            }
            else
            {
                rb.velocity = new Vector2(rb.velocity.x, -recoilYSpeed);
            }
            airJumpsCounter = 0;
        }
        else
        {
            rb.gravityScale = gravity;
        }

        //stop recoiling

        if (pState.recoilingx && stepsXRecoiled < recoilXSteps)
        {
            stepsXRecoiled++;
        }

        else
        {
            StopRecoilX();
        }

        if (pState.recoilingy && stepsYRecoiled < recoilYSteps)
        {
            stepsYRecoiled++;
        }

        else
        {
            StopRecoilY();
        }

        if (Grounded())
        {
            StopRecoilY();
        }
    }


    //stop recoiling forever
    void StopRecoilX()
    {
        stepsXRecoiled = 0;
        pState.recoilingx = false;
    }
    void StopRecoilY()
    {
        stepsYRecoiled = 0;
        pState.recoilingy = false;
    }



    //take damage, set health and gives some invinicibility frames
    public void TakeDamage(float _damage)
    {
        Health -= Mathf.RoundToInt(_damage);
        StartCoroutine(StopTakingDamage());
    }

    IEnumerator StopTakingDamage()
    {
        pState.invincible = true;
        GameObject _bloodSpurtParticles = Instantiate(bloodSpurt, transform.position, Quaternion.identity);
        Destroy(_bloodSpurtParticles, 1.5f);
        anim.SetTrigger("takeDamage");
        yield return new WaitForSeconds(1f);
        pState.invincible = false;
    }

    void FlashWhileInvincible()
    {
        sr.material.color = pState.invincible ?
            Color.Lerp(Color.white, Color.black, Mathf.PingPong(Time.time * hitFlashSpeed, 1.0f)) : Color.white;
    }

    void RestoreTimeScale()
    {
        if (restoreTime)
        {
            if (Time.timeScale < 1)
            {
                Time.timeScale += Time.deltaTime * restoreTimeSpeed;
            }
            else
            {
                Time.timeScale = 1;
                restoreTime = false;
            }
        }
    }

    public void HitStopTime(float _newTimeScale, int _restoreSpeed, float _delay)
    {
        restoreTimeSpeed = _restoreSpeed;
        Time.timeScale = _newTimeScale;

        if (_delay > 0)
        {
            StopCoroutine(StartTimeAgain(_delay));
            StartCoroutine(StartTimeAgain(_delay));
        }
        else
        {
            restoreTime = true;
        }
    }

    IEnumerator StartTimeAgain(float _delay)
    {
        restoreTime = true;
        yield return new WaitForSeconds(_delay);
    }

    public int Health
    {
        get { return health; }
        set
        {
            if (health != value)
            {
                health = Mathf.Clamp(value, 0, maxHealth);

                if (onHealthChangedCallBack != null)
                {
                    onHealthChangedCallBack.Invoke();
                }
            }
        }
    }




    //checks if you are grounded
    public bool Grounded()
    {
        if(Physics2D.Raycast(groundCheckPoint.position, Vector2.down, groundCheckY, whatIsGround) 
            || Physics2D.Raycast(groundCheckPoint.position + new Vector3(groundCheckX, 0, 0), Vector2.down, groundCheckY, whatIsGround)
            ||Physics2D.Raycast(groundCheckPoint.position + new Vector3(-groundCheckX, 0, 0), Vector2.down, groundCheckY, whatIsGround))
        {
            return true;
        }
        else
        {
            return false;   
        }
    }



    //makes you jump when pressing spacebar
    void Jump()
    {
        if(Input.GetButtonUp("Jump") && rb.velocity.y > 0)
        {
            rb.velocity = new Vector2(rb.velocity.x, 0);

            pState.jumping = false;
        }

        if(!pState.jumping)
        {
            if (jumpBufferCounter > 0 && coyoteTimeCounter > 0)
            {
                rb.velocity = new Vector3(rb.velocity.x, jumpForce);

                pState.jumping = true;
            }
            else if(!Grounded() && airJumpsCounter < maxAirJumps && Input.GetButtonDown("Jump"))
            {
                pState.jumping = true;

                airJumpsCounter++;

                rb.velocity = new Vector3(rb.velocity.x, jumpForce);

            }
        }



        //animate jumping double jump and falling animation

        anim.SetBool("jumping", !Grounded() && rb.velocity.y > -20 && airJumpsCounter == 0);

        anim.SetBool("doublejump", !Grounded() && airJumpsCounter == 1);


        anim.SetBool("falling", !Grounded() && rb.velocity.y < -10);

    }



    //coyote time and jump buffering
    void updateJumpVariable()
    {
        //coyote time
        if (Grounded())
        {
            pState.jumping = false;
            coyoteTimeCounter = coyoteTime;
            airJumpsCounter = 0;
        }
        else
        {
            coyoteTimeCounter -= Time.deltaTime;
        }


        //jump buffering
        if (Input.GetButtonDown("Jump"))
        {
            jumpBufferCounter = jumpBufferFrames;
        }
        else
        {
            jumpBufferCounter--;
        }
    }
}

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

public class HeartController : MonoBehaviour
{
    PlayerController player;

    private GameObject[] heartContainers;
    private Image[] heartFills;
    public Transform heartsParent;
    public GameObject heartContainerPrefab;
    // Start is called before the first frame update
    void Start()
    {
        player = PlayerController.Instance;
        heartContainers = new GameObject[PlayerController.Instance.maxHealth];
        heartFills = new Image[PlayerController.Instance.maxHealth];

        PlayerController.Instance.onHealthChangedCallBack += UpdateHeartsHUD; // += as multicasting delegate - many func at same time
        InstantiateHeartContainers();
        UpdateHeartsHUD();
    }

    // Update is called once per frame
    void Update()
    {

    }

    void SetHeartContainers()
    {
        for (int i = 0; i < heartContainers.Length; i++)
        {
            if (i < PlayerController.Instance.maxHealth)
            {
                heartContainers[i].SetActive(true);
            }
            else
            {
                heartContainers[i].SetActive(false);
            }
        }
    }

    void SetFilledHearts()
    {
        for (int i = 0; i < heartFills.Length; i++)
        {
            if (i < PlayerController.Instance.maxHealth)
            {
                heartFills[i].fillAmount = 1;
            }
            else
            {
                heartFills[i].fillAmount = 0;
            }
        }
    }

    void InstantiateHeartContainers()
    {
        for (int i = 0; i < PlayerController.Instance.maxHealth; i++)
        {
            GameObject temp = Instantiate(heartContainerPrefab);
            temp.transform.SetParent(heartsParent, false);
            heartContainers[i] = temp;
            heartFills[i] = temp.transform.Find("HeartFill").GetComponent<Image>();
        }
    }

    void UpdateHeartsHUD()
    {
        SetHeartContainers();
        SetFilledHearts();
    }
}

[Terence]

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Hi Niyam,

The hearts should automatically update according to how much health you have. I suspect you probably forgot to assign something in the Inspector, or you are missing a line or 2 somewhere.

Can you play the game, select your player character and go into Debug mode on the Inspector? Here’s how you activate debug mode: https://blog.theknightsofunity.com/can-switch-inspector-debug-mode/

Then, let your player take damage and see if his / her health value in the Inspector decreases.

[Niyam Shah]

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Yes my player takes damage in debug mode. What do I do next??

[Niyam Shah]

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Wait ok thanks it works now👍🏾👍🏾

[Terence]

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That’s great! How did you fix it?

[Niyam Shah]

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So everything was correct in the inspector and I couldn’t see any issues in my code? Was rlly strange… I copied and pasted the health deplete code from ur blog and then it suddenly started working?

[Terence]

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Either there was a difference between your code and the code that was in the blog, or Unity did not compile your code after you made changes to it. Very rarely, Unity can compile the older version of your code even after you’ve made changes and saved.

To see if your code is different from what’s on the blog, you can compare them on this site: https://www.diffchecker.com/

[Author]

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