如何翻转 AI 敌方角色的精灵以面向其移动方向？

Question

我正在尝试制作一个可以从一个点移动到另一个点的巡逻 AI 角色。

巡逻部分完美运行。然而，问题是精灵只面向右边。当它转动时，精灵保持朝向相同的方向。

我尝试使用transform.rotate、transform.rotation、transform.Quaternion 更改变换旋转并创建一个变量来存储旋转值，但它们都将错误返回。错误通常是由于旋转/旋转功能与我尝试过的任何尝试都不兼容。

这是我的代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// To do:
/// - make rotation of enemy sprite work when reaching the end of patrol area
/// - create attack function
/// </summary>


public class Enemy : MonoBehaviour
{
    public int health;
    public float speed;
    public GameObject bloodEffect;
    public Transform[] moveSpots;               //patrol spots
    public float startWaitTime;                 //start countdown till move to next spot

    private Rigidbody2D rb;
    private Animator anim;
    private int randomSpot;                     //number of patrol spots 
    private float waitTime;                     //how long enemy stays at patrol spot for

    // Start is called before the first frame update
    void Start()
    {
        waitTime = startWaitTime; //make waittime equal to startwaittime
        anim = GetComponent<Animator>();
        randomSpot = Random.Range(0, moveSpots.Length); //choose a random first spot 
    }

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

        Vector3 spriteRotation = new Vector3(0, randomSpot, 0);
        transform.position = Vector2.MoveTowards(transform.position, moveSpots[randomSpot].position, speed * Time.deltaTime); //move toward first patrol area
        transform.eulerAngles = spriteRotation;

        if (Vector2.Distance(transform.position, moveSpots[randomSpot].position) < 0.5f) //asks if patrol point is further that .5f away from enemy
        {
            if (waitTime <= 0) //if waitTime less than or equal to 0
            {

                randomSpot = Random.Range(0, moveSpots.Length); //picks new patrol point
                waitTime = startWaitTime; //restarts countdown clock
            }
            else
            {
                waitTime -= Time.deltaTime; //counts down clock till next point
            }
        }

        if (health <= 0)
        {
            Destroy(gameObject);
        }
    }


    public void TakeDamage(int damage)
    {
        Instantiate(bloodEffect, transform.position, Quaternion.identity);
        Debug.Log("Blood effect played");
        health -= damage;
        Debug.Log("Damage Taken");
    }
}

此代码的预期结果是会选择一个随机点，并且 AI 将向该选定点移动。一旦到达那里，它将在指定的时间内保持空闲状态，然后转向并移动到新位置。

实际结果与预期大致相同，只是精灵没有转身而是继续面向右侧，即使 AI 向左移动。

Image of area 敌人是暗红色立方体，移动点是敌人巡逻的点。当它到达左侧时，他应该向右转并返回，但这不是发生的情况，而是他只是来回移动而不旋转。我试过 SpriteRenderer.flipX 路线，它只工作一次，然后坚持那个方向。

Answer 1

SpriteRenderer 组件有一个 Flip 属性，您可以使用它。

你可以在代码中访问它

SpriteRenderer.flipX = true;

它只会翻转精灵而不会改变其他任何东西，所以仔细检查你的碰撞器是否仍然在正确的空间:) See more in the documentation 祝你好运

Answer 2

randomSpot 是索引而不是角度。所以使用

transform.eulerAngles = new Vector3(0, randomSpot, 0);

对我来说没有任何意义......

---

除了旋转，您还可以使用负比例来翻转 sprite/Image，例如

// Update is called once per frame
private void Update()
{
    // however you determin if facing left or right
    // you e.g. simply check whether the target position 
    // is left or right of you
    var difference = moveSpots[randomSpot].position - transform.position;
    var isFacingRight = difference.x > 0; 

    if (isFacingRight && transform.localScale.x < 0
        || !isFacingRight && transform.localScale.x > 0)
    {
        FlipSprite();
    }
}

private void FlipSprite()
{
    // invert the local X-axis scale
    transform.localScale = new Vector3(-spriteTransform.localScale.x, spriteTransform.localScale.y, spriteTransform.localScale.z);
}

---

示例中使用的脚本

private void Update()
{
    // works only in a ScreenOverlay Canvas
    var targetPosition = Input.mousePosition;

    var difference = targetPosition - transform.position;
    var isFacingRight = difference.x > 0 ? true : false;

    if (isFacingRight && transform.localScale.x < 0
        || !isFacingRight && transform.localScale.x > 0)
    {
        FlipSprite();
    }

    // simply only move left or right on the x-axis towards the mouse
    transform.position = Vector3.MoveTowards(transform.position, new Vector3(targetPosition.x, 218, 0), Time.deltaTime * 100);
}

private void FlipSprite()
{
    // invert the local X-axis scale
    transform.localScale = new Vector3(-transform.localScale.x, transform.localScale.y, transform.localScale.z);
}

Answer 3

你可以试试：

if (moveSpot[randomSpot].transform.position.x > transform.position.x) {
    transform.localScale = new Vector3(-1, 1, 1);
}
else {
    transform.localScale = new Vector3(1, 1, 1);
}