[part 21] question

[Kim Il Woo (FGW HCM)]

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using UnityEngine;
using UnityEngine.Scripting.APIUpdating;

public class EnemyMovement : MonoBehaviour
{
    protected EnemyStats enemy;
    protected Transform player;

    protected Vector2 knockbackVelocity;
    protected float knockbackDuartion;

    public enum OutOffFrameAction { none, respawnAtEdge, despawn }
    public OutOffFrameAction outOffFrameAction = OutOffFrameAction.respawnAtEdge;

    protected bool spawnedOutOfFrame = false;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    protected virtual void Start()
    {
        spawnedOutOfFrame = !SpawnManager.IsWithinBoundaries(transform);
        enemy = GetComponent<EnemyStats>();

        //Picks a random player on the screen, instead of alwats picking 1st player
        PlayerMovement[] allPlayers = FindFirstObjectByType<PlayerMovement>();
        player = allPlayers[Random.Range(0, allPlayers.Length)].transform;
    }

    // Update is called once per frame
    protected virtual void Update()
    {
        //if enemy currently being knock back, process the knockback
        if (knockbackDuartion > 0)
        {
            transform.position += (Vector3)knockbackVelocity * Time.deltaTime;
            knockbackDuartion -= Time.deltaTime;
        }
        else
        {
            Move();
            HandleOutOfFrameAction();
        }
    }

    protected virtual bool HandleOutOfFrameAction()
    {
        //handle enem when it out of frame
        if (!SpawnManager.IsWithinBoundaries(transform))
        {
            switch (outOffFrameAction)
            {
                case OutOffFrameAction.none:
                default:
                    break;
                case OutOffFrameAction.respawnAtEdge:
                    transform.position = SpawnManager.GeneratePosition();
                    break;
                case OutOffFrameAction.despawn:
                    if (!spawnedOutOfFrame)
                    {
                        Destroy(gameObject);
                    }
                    break;
            }
        }
        else spawnedOutOfFrame = false;
        return false;
    }

    public virtual void Knockback(Vector2 velocity, float duration)
    {
        //ignore the knockback if the duration is greater than 0
        if (knockbackDuartion > 0) return;

        //begin knockback
        knockbackVelocity = velocity;
        knockbackDuartion = duration;
    }

    public virtual void Move()
    {
        //constantly move enemy toward player
        transform.position = Vector2.MoveTowards(transform.position, player.transform.position, enemy.currentMoveSpeed * Time.deltaTime);
    }
}

Cannot implicitly convert type ‘PlayerMovement’ to ‘PlayerMovement[]’

[Alp Apustaja]

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The error suggests using FindObjectsOfType() instead of FindFirstObjectByType(). The method FindObjectsOfType() returns an array of PlayerMovement components, which matches the type declaration PlayerMovement[] allPlayers.

So the corrected line should be:

PlayerMovement[] allPlayers = FindObjectsOfType();

[Kim Il Woo (FGW HCM)]

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FindObjectsOfType<PlayerMovement>() is deprecated in newer Unity versions so when i change the line above it show this

‘Object.FindObjectsOfType<T>()’ is obsolete: ‘Object.FindObjectsOfType has been deprecated. Use Object.FindObjectsByType instead which lets you decide whether you need the results sorted or not. FindObjectsOfType sorts the results by InstanceID but if you do not need this using FindObjectSortMode.None is considerably faster.’

[Alp Apustaja]

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Use the updated method with sorting mode:

PlayerMovement[] allPlayers = Object.FindObjectsByType(FindObjectsSortMode.None);

This resolves the deprecation warning by explicitly specifying FindObjectsSortMode.None for better performance.

[Kim Il Woo (FGW HCM)]

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fixed

[Alp Apustaja]

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Great! It seems like the issue with finding player objects in Unity has been resolved. Is there anything specific you would like to discuss or any other programming challenge you’re facing with your Vampire Survivors-style game?

[Author]

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