2d 射手鼠标跟随问题。 统一 2d

Question

I am making a 2d shooter but I have run into an issue. When my character flips its scale to -1 when going left the rotation of the weapon hold inverts away from the cursor. Here is the mouse follow code I have in case it is needed.

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



    public float offset;



    void Update()
    {
        Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        float rotZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotZ + offset);


    }

Any help is use full.

Answer 1

Use Mathf.Sign to take the sign of the x scale into account when calculating the rotation. You will use it to negate x component of the rotation and the angle of rotation itself when the scale is flipped:

Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) 
        - transform.position;
float scaleSign = Mathf.Sign(transform.localScale.x);
float rotZ = Mathf.Atan2(difference.y, difference.x * scaleSign) * Mathf.Rad2Deg;
transform.rotation = Quaternion.Euler(0f, 0f, (rotZ + offset) * scaleSign );

Answer 2

Add this to your code.

        if (rotZ < -90f || rotZ > 90f)
        {
            if (playerGameObject.transform.eulerAngles.y == 0f)
            {
                transform.localRotation = Quaternion.Euler (180f, 0f, rotZ); 
            }
            else if (playerGameObject.transform.eulerAngles.y == 180f)
            {
                transform.localRotation = Quaternion.Euler (180f, 180f, -rotZ); 
            }
        }

The full thing would be like this

    public float offset;

    void Update()
    {
        Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        float rotZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotZ + offset);

        if (rotZ < -90f || rotZ > 90f)
        {
            if (playerGameObject.transform.eulerAngles.y == 0f)
            {
                transform.localRotation = Quaternion.Euler (180f, 0f, rotZ); 
            }
            else if (playerGameObject.transform.eulerAngles.y == 180f)
            {
                transform.localRotation = Quaternion.Euler (180f, 180f, -rotZ); 
            }
        }
    }

This code changes the way you are rotating the gun if the player is flipped.