Unity) [유니티 2D] 가상 조이스틱을 통한 Rotation 변경

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class JoystickGunShot : MonoBehaviour, IDragHandler, IPointerUpHandler, IPointerDownHandler
{
    public RectTransform frame;
    public RectTransform handle;

    private float handleRange = 130;
    private Vector3 input;

    public float Horizontal { get { return input.x; } }
    public float Vertical { get { return input.y; } }
    public Vector3 Input { get { return input; } }

    public void OnDrag(PointerEventData eventData)
    {
        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
            this.gameObject.GetComponent<RectTransform>(), eventData.position,
            eventData.pressEventCamera, out Vector2 localVector))
        {
            if (localVector.magnitude < this.handleRange)
            {
                this.handle.transform.localPosition = localVector;
            }
            else
            {
                this.handle.transform.localPosition = localVector.normalized * this.handleRange;
            }

            this.input = localVector;
        }

        this.SetJoystickColor(true);
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        this.input = Vector2.zero;
        this.handle.anchoredPosition = Vector2.zero;
        this.SetJoystickColor(false);
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        this.OnDrag(eventData);
    }

    private void SetJoystickColor(bool isOnDraged)
    {
        Color pointedFrameColor;
        Color pointedHandleColor;

        if (isOnDraged)
        {
            pointedFrameColor = new Color(255, 0, 0, 0.5f);
            pointedHandleColor = new Color(255, 0, 0, 0.6f);
        }
        else
        {
            pointedFrameColor = new Color(255, 255, 255, 0.5f);
            pointedHandleColor = new Color(255, 255, 255, 0.6f);
        }

        this.frame.gameObject.GetComponent<Image>().color = pointedFrameColor;
        this.handle.gameObject.GetComponent<Image>().color = pointedHandleColor;
    }
}

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

public class GunRotation : MonoBehaviour
{
    private JoystickGunShot joystickGunShot;
    private float angle;

    public float Angle { get { return angle; } }

    public void Init()
    {
        this.joystickGunShot = GameObject.FindObjectOfType<JoystickGunShot>();
        StartCoroutine(CheckGunRotationRoutine());
    }

    IEnumerator CheckGunRotationRoutine()
    {
        while (true)
        {
            RotateGun();
            yield return null;
        }
    }

    void RotateGun()
    {
        if (this.joystickGunShot.Input == Vector3.zero) return;
        this.angle = Mathf.Atan2(this.joystickGunShot.Vertical, this.joystickGunShot.Horizontal) * Mathf.Rad2Deg + 90;
        var lookRotation = Quaternion.Euler(angle * Vector3.forward);
        this.transform.rotation = lookRotation;
    }
}

 

 - Mathf.Atan2(x, y) 메서드를 통하여 x와 y 사이의 각도 r을 구할 수 있다. Atan(x,y) 메서드는 0을 매개변수로 받았을 때 발생하는 오류를 처리할 수 있는 기능이 없으므로 Atan2를 주로 사용한다. 또한 각도(r)은 라디안 값이기 때문에 Mathf.Red2Deg을 곱하여 라디안을 상수로서 각도로 사용한다.