VirtualFramework/Assets/Scripts/Item/Show3DCamera.cs

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class Show3DCamera : MonoBehaviour
{
    public Transform target; // Χ<><CEA7><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>
    public float rotateSpeed = 10f; // <20><>ת<EFBFBD>ٶ<EFBFBD>
    public float moveSpeed = 10f; // <20>ƶ<EFBFBD><C6B6>ٶ<EFBFBD>
    public float distance = 10f; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD>ľ<EFBFBD><C4BE><EFBFBD>
    public Vector2 pitchMinMax = new Vector2(-20, 80); // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>Χ

    private Vector3 offset; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD><EFBFBD>
    private float yaw = 0f; // ƫ<><C6AB><EFBFBD>ǣ<EFBFBD><C7A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>
    private float pitch = 0f; // <20><><EFBFBD><EFBFBD><EFBFBD>ǣ<EFBFBD><C7A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>

    public static Show3DCamera instance;

    int rawWidth;
    int rawHeight;
    Camera self;

    private void Awake()
    {
        instance = this;
        self = transform.GetComponent<Camera>();
        DontDestroyOnLoad(this);
        gameObject.SetActive(false);
    }
    public void Set(int width,int height, Transform target, float rotateSpeed = 10, float moveSpeed = 0.1f, float distance = 0.1f, float pitchMin = -20, float pitchMax = 80)
    {
        if (target == null)
        {
            Debug.LogError("Target is not assigned!");
            return;
        }
        this.rawWidth = width;
        this.rawHeight = height;
        yaw = 0;
        pitch = 0;
        this.target = target.transform;
        this.rotateSpeed = rotateSpeed;
        this.moveSpeed = moveSpeed;
        this.distance = distance;
        this.pitchMinMax = new Vector2(pitchMin, pitchMax);
        // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>
        offset = new Vector3(0, 0, -distance);
        UpdateCameraPosition();
    }

    public void Clear()
    {
        target = null;
    }

    void Update()
    {
        if (target != null)
        {
            // <20><>ס<EFBFBD><D7A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>
            if (Input.GetMouseButton(0))
            {
                RotateCamera();
            }

            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
            float scroll = Input.GetAxis("Mouse ScrollWheel");
            if (scroll != 0)
            {
                ZoomCamera(scroll);
            }


            // <20><>ס<EFBFBD><D7A1><EFBFBD><EFBFBD><EFBFBD>Ҽ<EFBFBD>ʱ<EFBFBD>ƶ<EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>
            if (Input.GetMouseButton(1))
            {
                MoveTarget();
            }

            DetectHoveredObject();
        }
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><CDA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    private void DetectHoveredObject()
    {
        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        Ray ray = self.ScreenPointToRay(ConvertScreenToRenderTextureCoordinates(Input.mousePosition));
        if (Physics.Raycast(ray, out RaycastHit hit))
        {
            // <20><>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
            Debug.LogError("Hovered Object: " + hit.collider.gameObject.name);
        }
        Debug.DrawLine(ray.origin, hit.point, Color.red);
    }

    private Vector3 ConvertScreenToRenderTextureCoordinates(Vector3 screenPosition)
    {
        // <20><>ȡ<EFBFBD><C8A1>Ļ<EFBFBD>ֱ<EFBFBD><D6B1><EFBFBD>
        int screenWidth = Screen.width;
        int screenHeight = Screen.height;


        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        float scaleX = (float)rawWidth / screenWidth;
        float scaleY = (float)rawHeight / screenHeight;

        // ת<><D7AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>
        Vector3 renderTexturePosition = new Vector3(
            screenPosition.x * scaleX,
            screenPosition.y * scaleY,
            screenPosition.z
        );

        return renderTexturePosition;
    }


    // <20>ƶ<EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>
    private void MoveTarget()
    {
        float mouseX = Input.GetAxis("Mouse X") * moveSpeed;
        float mouseY = Input.GetAxis("Mouse Y") * moveSpeed;

        transform.Translate(new Vector3(-mouseX, -mouseY, 0));
    }
    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    private void ZoomCamera(float scroll)
    {
        distance -= scroll * 5f; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD>
        distance = Mathf.Clamp(distance, 0.2f, 20f); // <20><><EFBFBD>ƾ<EFBFBD><C6BE>뷶Χ
        offset = new Vector3(0, 0, -distance);
        UpdateCameraPosition();
    }

    // <20><>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>
    private void RotateCamera()
    {
        // <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>ƶ<EFBFBD><C6B6><EFBFBD>
        float mouseX = Input.GetAxis("Mouse X") * rotateSpeed;
        float mouseY = Input.GetAxis("Mouse Y") * rotateSpeed;

        // <20><><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD>Ǻ͸<C7BA><CDB8><EFBFBD><EFBFBD><EFBFBD>
        yaw += mouseX;
        pitch -= mouseY; // ע<>⣺<EFBFBD><E2A3BA><EFBFBD><EFBFBD> Y <20><><EFBFBD>ƶ<EFBFBD><C6B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>븩<EFBFBD><EBB8A9><EFBFBD><EFBFBD><EFBFBD>෴
        pitch = Mathf.Clamp(pitch, pitchMinMax.x, pitchMinMax.y); // <20><><EFBFBD>Ƹ<EFBFBD><C6B8><EFBFBD><EFBFBD>Ƿ<EFBFBD>Χ

        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>
        UpdateCameraPosition();
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD>úͳ<C3BA><CDB3><EFBFBD>
    private void UpdateCameraPosition()
    {
        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD><EFBFBD>
        Quaternion rotation = Quaternion.Euler(pitch, yaw, 0);
        Vector3 rotatedOffset = rotation * offset;

        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>
        transform.position = target.position + rotatedOffset;

        // <20><><EFBFBD><EFBFBD>ʼ<EFBFBD>ճ<EFBFBD><D5B3><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD>
        transform.LookAt(target);
    }
}