Question

首先：我是一个真正的菜鸟。

这是我的拍摄功能代码：

using UnityEngine;
using System.Collections;

public class Gun : MonoBehaviour 
{
public float fireRate = 0; // makes it a single fire per click weapon
public float Damage = 10;
public LayerMask notToHit; // tells us what is valid for being hit by the weapon
public float Range = 100;

float timeToFire = 0;
Transform firePoint;


// Use this for initialization
void Awake () 
{
    firePoint = transform.FindChild ("firePoint");
    if (firePoint == null) 
    {
        Debug.LogError ("No FirePoint object found as a child of the cannon");
    }
}

// Update is called once per frame
void Update () 
{
            Shoot ();
            if (fireRate == 0)
            {
                    if (Input.GetButtonDown ("Fire1"))
                    {
                            Shoot ();
                    }
            } 
            else 
            {
                    if (Input.GetButtonDown ("Fire1") && Time.time > timeToFire) {
                            timeToFire = Time.time + 1 / fireRate;
                            Shoot ();
                    }
            }
}
void Shoot ()
{
    Vector2 firePointPosition = new Vector2 (firePoint.position.x, firePoint.position.y);
    Vector2 target = new Vector2 (firePoint.position.x, [firePoint.position.y + Range]);
    RaycastHit2D hit = Physics2D.Raycast (firePoint, notToHit);
    Debug.DrawLine (firePointPosition, target);

}

我只是希望它从我的firePoint对象（在我的大炮口）画一条线（因为我还在学习）到Y轴上的+100个单位（范围= 100）。 / p>

我正在跟踪c＃错误：

1）Assets / Gun.cs（47,69）：错误CS1526：新类型表达式需要（）或[]类型

2）Assets / Gun.cs（47,98）：错误CS8032：解析期间内部编译器错误，使用-v运行以获取详细信息

有人能指出我正确的方向吗？

Answer 1

由于Noctis已经写过Vector2目标线是错误的。它应该是这样的

Vector2 target = new Vector2 ( firePoint.position.x, (firePoint.position.y + Range));

之后你说你有另一个编译错误，但是第48行是错误的，所以Raycast调用是错误的。要调用Raycast，您必须执行以下操作：

RaycastHit2D hit = Physics2D.Raycast (Origin, Direction);
// So your code should be 
RaycastHit2D hit = Physics2D.Raycast (firePoint, DIRECTION);

这意味着你必须创建另一个Vector2来定义你的“射击线”的方向。

我附上了一个描述Raycast调用的链接 See the reference here

请尝试更新您的代码并返回

因为我可以看到你现在只想画线，你应该注释掉你的错误代码。所以你的代码应该是这样的：

void Shoot ()
{
    Vector2 firePointPosition = new Vector2 (firePoint.position.x, firePoint.position.y);
    Vector2 target = new Vector2 (firePoint.position.x, (firePoint.position.y + Range));
    // No need to do the ray casting right now 
    // RaycastHit2D hit = Physics2D.Raycast (firePoint, notToHit);
    Debug.DrawLine (firePointPosition, target);
}

Answer 2

这条线对我来说似乎非常可疑：

  Vector2 target = new Vector2 ( firePoint.position.x
                               , [firePoint.position.y + Range]
                               );

你将一个看起来像阵列的东西传递给新功能，这就是为什么它会抱怨我相信。

你试着说：

  Vector2 target = new Vector2 ( firePoint.position.x 
                               , (firePoint.position.y + Range)
                               );

Answer 3

回答解雇问题：我假设您正在使用精灵和2D环境，因为您使用的是Vector2。如果是这种情况，您可能想要使用Vector2.right或Transform.forward来强制或直接更改“项目符号”变换，后者将根据角色所面对的位置而变化。如果你要在firePointPosition变换中instantiate子弹预制件，我会建议只对预制件施加一个力来实例化。类似的东西：

public GameObject bulletPrefab; //Initialize it either by drag&drop from the editor or through code
private float bulletSpeed; // self explanatory

/* Rest of the code*/

GameObject bullet = Instantiate(bulletPrefab, firePointPosition, Quaternion.identity) as GameObject;
bullet.rigidbody.AddForce(Vector2.right * bulletSpeed);
// or
bullet.rigidbody.AddForce(transform.forward * bulletSpeed);

如何在c＃中向右侧的直线发射一个从枪中射出子弹的功能？

3 个答案: