问题描述
我对编码有点陌生，大约一年的经验。我不知道为什么我的脚本不会对以固定速度射击的子弹增加力量。这似乎取决于玩家移动的速度，但是我使用了2个不同的变量作为速度和MovementSpeed，所以我不知道为什么要这么做。我将如何解决这个问题？我也试图做到这一点，以便当角色面对该方向时我可以从左右两侧独立拍摄，但似乎不起作用。当我尝试修复它时，它会抛出错误，实例化时项目符号会保留在原位，或者项目符号总是在右侧。如果我做错了，正确的做法是什么？
using System.Collections.Generic;
using UnityEngine;
public class BulletScript : MonoBehavIoUr
{
public GameObject Bullet;
public float sec = 2f;
public float speed = 80;
public GameObject Enemy;
public Transform spawnPoint;
public Rigidbody2D bulletRB;
private float timeBtwShots;
public float startTimeBtwShots;
public AudioSource Gunshot;
public Animator animator;
private float vert;
private float horiz;
// Start is called before the first frame update
void Start()
{
if (gameObject.tag == "Bullet")
this.gameObject.SetActive(true);
StartCoroutine(LateCall());
IEnumerator LateCall()
{
yield return new WaitForSeconds(sec);
this.gameObject.SetActive(false);
}
}
void OnCollisionEnter2D(Collision2D Other)
{
Destroy(this.gameObject);
}
void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Enemy")
{
this.gameObject.SetActive(false);
other.gameObject.SetActive(false);
}
}
IEnumerator ShootingAnim()
{
timeBtwShots = startTimeBtwShots;
Gunshot.Play();
animator.SetBool("IsShooting",true);
yield return new WaitForSeconds(0.2f);
animator.SetBool("IsShooting",false);
}
void Update()
{
horiz = Input.GetAxis("Horizontal");
vert = Input.GetAxis("Vertical");
if (Input.GetMouseButtonDown(0))
{
Instantiate(bulletRB,spawnPoint.position,Quaternion.identity);
}
}
void FixedUpdate()
{
if (timeBtwShots <= 0)
{
bulletRB.AddForce(transform.TransformDirection(new Vector2(horiz,vert)).normalized * speed);
StartCoroutine(ShootingAnim());
}
else
{
timeBtwShots -= Time.deltaTime;
}
if (gameObject.tag == "Bullet")
{
Destroy(this.gameObject,1f);
}
}
}
解决方法
不要使用输入来确定子弹的方向，而要存储玩家所看的方向。添加一个名为“ currentDirection”的新Vector2，并将其默认为Vector2.right或其他名称。计算播放器上的移动时，请执行以下操作：
if (!Mathf.Approximately(horiz,0) || !Mathf.Approximately(vert,0))
currentDirection = new Vector2(horiz,vert).normalized;
您会注意到第一行检查任一行是否都不为零。我这样做是因为如果两个输入均为0，则方向也为零。我们只想保存玩家输入的最后一个方向，而不是缺少方向。
接下来，子弹还应该具有方向变量。生成项目符号时，将项目符号的方向设置为currentDirection。您只想在生成子弹时执行此操作。如果每隔一帧将子弹的方向设置为玩家当前的输入，那么它将根据玩家的输入不断地改变方向。
然后只是告诉项目符号朝其指定的方向移动。人们通常会改变旋转方向以匹配方向并告诉其前进，但这取决于您希望艺术品寻找子弹的方式。
也非常重要，但又无关紧要：您需要将所有刚体代码放入FixedUpdate中。物理仅在固定更新期间发生，因此执行任何与物理无关的操作都可能导致问题。但是，这样做时，将输入检查保留在Update中。由于FixedUpdates并非在每一帧都发生，因此如果将它们放入FixedUpdate，可能会丢失输入。因此，添加一些输入变量，并在更新中添加
jumpInput = Input.GetButtonDown("Jump");
horiz = Input.GetAxis("Horizontal");
vert = Input.GetAxis("Vertical");
然后在FixedUpdate中，您的物理过程就像：
if (jumpInput && Mathf.Abs(_rigidbody.velocity.y) < 0.001f)
最后弄清楚了。我做了一个完整的重写，因为我使代码过于复杂。 这是最终的脚本：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerController : MonoBehaviour
{
public float MovementSpeed = 1;
public float JumpForce = 1;
public float jumpTime = 1f;
public Rigidbody2D _rigidbody;
private bool facingRight;
public float sec = 2f;
public Vector2 bulletPos;
public GameObject bulletToRight,bulletToLeft;
public Transform spawnPoint;
public Rigidbody2D bulletRB;
public AudioSource Gunshot;
float horizontalMove = 0f;
public float fireRate = 0.5f;
float nextFire = 0f;
// public AudioSource Jump;
public Animator animator;
void HandleMovement(float horizontal)
{
transform.position += new Vector3(horizontal,0) * Time.deltaTime * MovementSpeed;
animator.SetFloat("velX",(horizontal));
}
void Flip(float horizontal)
{
if (horizontal < 0 && !facingRight || horizontal > 0 && facingRight)
{
facingRight = !facingRight;
Vector3 theScale = transform.localScale;
theScale.x *= -1;
transform.localScale = theScale;
transform.position += new Vector3(horizontal,0) * Time.deltaTime * MovementSpeed;
horizontalMove = Input.GetAxisRaw("Horizontal") * MovementSpeed;
animator.SetFloat("velX",(horizontalMove));
}
}
IEnumerator ShootingAnim()
{
animator.SetBool("IsShooting",true);
yield return new WaitForSeconds(0.2f);
animator.SetBool("IsShooting",false);
}
void Update()
{
animator.SetFloat("velX",Mathf.Abs(horizontalMove));
if (Input.GetButtonDown("Jump") && Mathf.Abs(_rigidbody.velocity.y) < 0.001f)
{
_rigidbody.AddForce(new Vector2(0,JumpForce),ForceMode2D.Impulse);
animator.SetBool("IsJumping",true);
// Jump.Play();
}
if (Mathf.Abs(_rigidbody.velocity.y) == 0f)
{
animator.SetBool("IsJumping",false);
}
if ((_rigidbody.velocity.x) >= 0.01f || (_rigidbody.velocity.x <= -0.01f))
{
animator.SetBool("IsRunning",true);
}
if (Input.GetMouseButtonDown(0) && Time.time > nextFire)
{
StartCoroutine(ShootingAnim());
nextFire = Time.time + fireRate;
Fire();
}
float horizontal = Input.GetAxis("Horizontal");
HandleMovement(horizontal);
Flip(horizontal);
}
void Fire()
{
bulletPos = spawnPoint.position;
if (!facingRight)
{
bulletPos += new Vector2(+0.02f,0f);
Instantiate(bulletToRight,bulletPos,Quaternion.identity);
Gunshot.Play();
} else
{
bulletPos += new Vector2(-0.02f,0f);
Instantiate(bulletToLeft,Quaternion.identity);
Gunshot.Play();
}
}
}
这是BulletScript：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class BulletScript : MonoBehaviour
{
public GameObject Bullet;
public Transform spawnPoint;
public Rigidbody2D bulletRB;
public float velX = 5f;
float velY = 0f;
// Start is called before the first frame update
void Start()
{
bulletRB = GetComponent<Rigidbody2D>();
}
void OnCollisionEnter2D(Collision2D Other)
{
Destroy(this.gameObject);
}
void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Enemy")
{
this.gameObject.SetActive(false);
other.gameObject.SetActive(false);
}
}
private void Update()
{
bulletRB.velocity = new Vector2(velX,velY);
Destroy(gameObject,3f);
}
}