如何在鼠标按钮上开火？

Question

我正在尝试在 Unity 上做我的第一个平台游戏。并且弹丸有问题。我找到了一个教程，如何创建一个移动的射弹，但没有触发 Fire 按钮。可以更改此脚本以触发按钮吗？我试着用 if 语句来实现它，但是弹丸只移动了一个，它不会飞:(

public class projectile : MonoBehaviour
{
    public GameObject player;
    public GameObject target;

    private float playerX;
    private float targetX;

    private float dist;
    private float nextX;
    private float baseY;
    private float height;

    public float speed = 10f; 


    void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player");
        target = GameObject.FindGameObjectWithTag("Enemy");
    }

    void Update()
    {  
       Fire();           
    }

    public static Quaternion LookAtTarget(Vector2 rotation)
    {
        return Quaternion.Euler(0, 0, Mathf.Atan2(rotation.y, rotation.x) * Mathf.Rad2Deg); 
    }

    private void Fire()
    {       
        playerX = player.transform.position.x;
        targetX = target.transform.position.x;

        dist = targetX - playerX;
        nextX = Mathf.MoveTowards(transform.position.x, targetX, speed * Time.deltaTime);
        baseY = Mathf.Lerp(player.transform.position.y, target.transform.position.y, (nextX - playerX) / dist);
        height = 2 * (nextX - playerX) * (nextX - targetX) / (-0.25f * dist * dist);

        Vector3 movePosition = new Vector3(nextX, baseY + height, transform.position.z);
        transform.rotation = LookAtTarget(movePosition - transform.position);

        if (transform.position == target.transform.position)
        {
              Destroy(gameObject);
            
        }
    }
}

Answer 1

Update

方法中的内容每一帧都会发生，因此您需要创建一个手动触发器（

bool isFired

）。

想法是当

isFired

为假时，什么也不会发生。 然后，当

isFired

变为真时，弹丸开始移动。

您的

Fire

方法实际上使弹丸移动，因此您应该将其重命名为

Move

并且在

Update

中您仅在发射弹丸时调用

Move

。

public class projectile : MonoBehaviour
{
    // At the start, the projectile is not fired
    bool isFired = false;

    void Update()
    {
        // If the player presses a button, the projectile is fired
        if (Input.GetMouseButtonDown(0)) isFired = true;
        // Only if the projectile is fired, it should moves
        if (isFired) Move();
    }

    void Move()
    {
        // Here you have the content of your Fire method
    }
}