运算符“*”不能应用于“void”和“float”类型的操作数

Posted 2023-03-31

【中文标题】运算符“*”不能应用于“void”和“float”类型的操作数

【英文标题】：Operator '*' cannot be applied to operands of type 'void' and 'float'

【发布时间】：2021-07-27 08:56:35

【问题描述】：

***

使用 System.Collections；使用 System.Collections.Generic；使用 统一引擎；公共类击退：MonoBehaviour 公共浮动推力； 公共浮动敲击时间；

// Start is called before the first frame update
void Start()

    

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

    

private void OnTriggerEnter2D(Collider2D other)

    if(other.gameObject.CompareTag("enemy"))
    
        Rigidbody2D enemy = other.GetComponent<Rigidbody2D>();
        if(enemy != null)
        
            StartCoroutine(KnockCo(enemy));
        
    

private IEnumerator KnockCo(Rigidbody2D enemy)

    if(enemy != null)
    
        Vector2 forceDirection = enemy.transform.position - transform.position;
        Vector2 force = forceDirection.Normalize() * thrust;
        
        enemy.velocity = force;
        yield return new WaitForSeconds(KnockTime);
       
       enemy.velocity = new Vector2();
       
       
    
 

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【参考方案1】：

forceDirection.Normalize() 改变forceDirection 向量并返回void，而不是返回归一化的向量。因此，您需要将 Normalize() 调用和乘法拆分为单独的语句：

Vector2 forceDirection = enemy.transform.position - transform.position;
forceDirection.Normalize();
Vector2 force = forceDirection * thrust;