unity自由摄像机

自由摄像机

使用wasd控制

// **********************************************************************
//  文件信息
// 文件名(File Name):                  FreeCamera.cs
// 作者(Author):                          hhhh
// 创建时间(CreateTime):             2022年7月16日 17:32:05
// Unity版本(UnityVersion)：       2021.1.18f1c1
// 脚本描述(Module description):
// **********************************************************************

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

[AddComponentMenu("Camera/FreeCamera")]
public class FreeCamera : MonoBehaviour
{
    private Vector3 _oldMousePosition;
    private Vector3 _newMousePosition;

    [SerializeField]
    private float _flMinimumY = 0.2f;

    [SerializeField]
    private float _flZoomSpeed = 30.0f;
    [SerializeField]
    private float _flKeyBoardMoveSpeed = 1f;
    [SerializeField]
    private float _flRoteSpeed = 0.05f;

    private float _fldistance = 5;
    //private Vector3 centerOffset = Vector3.zero;
    private Vector3 _initPos = Vector3.zero;
    private Vector3 _initRot = Vector3.zero;

    private void Awake()
    {
        _initPos = transform.position;
        _initRot = transform.eulerAngles;
    }

    private void OnEnable()
    {
        transform.position = _initPos;
        transform.eulerAngles = _initRot;
    }

    void Update()
    {
        MoveCameraKeyBoard();
        ZoomCamera();
        CameraRotation();

        _oldMousePosition = Input.mousePosition;
    }

    /// <summary>
    /// 鼠标控制移动
    /// </summary>
    private void MoveCameraKeyBoard()
    {
        if (Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.LeftArrow))
        {
            transform.Translate(new Vector3(-_flKeyBoardMoveSpeed, 0, 0), Space.Self);
        }
        if (Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.RightArrow))
        {
            transform.Translate(new Vector3(_flKeyBoardMoveSpeed, 0, 0), Space.Self);
        }
        if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow))
        {
            transform.Translate(new Vector3(0, 0, _flKeyBoardMoveSpeed), Space.Self);
        }
        if (Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow))
        {
            transform.Translate(new Vector3(0, 0, -_flKeyBoardMoveSpeed), Space.Self);
        }
        if (Input.GetKey(KeyCode.E))
        {
            transform.Translate(new Vector3(0, _flKeyBoardMoveSpeed, 0), Space.World);
        }
        if (Input.GetKey(KeyCode.Q))
        {
            if (transform.transform.position.y - _flKeyBoardMoveSpeed >= this._flMinimumY)
                transform.Translate(new Vector3(0, -_flKeyBoardMoveSpeed, 0), Space.World);
        }
    }

    /// <summary>
    /// 鼠标控制摄像机是视角，上下左右看
    /// </summary>
    private void CameraRotation()
    {
        if (Input.GetMouseButton(1))
        {
            _newMousePosition = Input.mousePosition;
            Vector3 dis = _newMousePosition - _oldMousePosition;
            float angleX = dis.x * _flRoteSpeed;
            float angleY = dis.y * _flRoteSpeed;
            transform.Rotate(new Vector3(-angleY, 0, 0), Space.Self);
            transform.Rotate(new Vector3(0, angleX, 0), Space.World);
        }
    }

    /// <summary>
    /// 摄像机的缩放
    /// </summary>
    private void ZoomCamera()
    {
        float offset = Input.GetAxis("Mouse ScrollWheel");
        if (offset != 0)
        {
            offset *= _flZoomSpeed;
            _fldistance -= offset;
            transform.Translate(Vector3.forward * offset, Space.Self); //
        }
    }
}