using UnityEngine;

public class MRCamera : MonoBehaviour
{
    private float xRotation;
    private float yRotation;
    public int yRotationMinLimit = -20;
    public int yRotationMaxLimit = 80;
    private float xRotationSpeed = 100;
    private float yRotationSpeed = 100;

    void Update()
    {
        CameraRotation();
        CameraMove();
    }

    float ClampValue(float value, float min, float max)//控制旋转的角度
    {
        if (value < -360)
            value += 360;
        if (value > 360)
            value -= 360;
        return Mathf.Clamp(value, min, max);//限制value的值在min和max之间， 如果value小于min，返回min。 如果value大于max，返回max，否则返回value
    }

    void CameraRotation()
    {
        float _MouseX = Input.GetAxis("Mouse X");
        float _MouseY = Input.GetAxis("Mouse Y");
        if (Input.GetMouseButton(1))
        {
            xRotation -= _MouseX * xRotationSpeed * 0.02f;
            yRotation += _MouseY * yRotationSpeed * 0.02f;
            yRotation = ClampValue(yRotation, yRotationMinLimit, yRotationMaxLimit);
            Quaternion rotation = Quaternion.Euler(-yRotation, -xRotation, 0);
            transform.rotation = rotation;
        }
    }

    void CameraMove()
    {
        if (Input.GetKey(KeyCode.W))
        {
            transform.Translate(new Vector3(0, 0, 0.5f));
        }
        if (Input.GetKey(KeyCode.A))
        {
            transform.Translate(new Vector3(-0.5f, 0, 0));
        }
        if (Input.GetKey(KeyCode.S))
        {
            transform.Translate(new Vector3(0, 0, -0.5f));
        }
        if (Input.GetKey(KeyCode.D))
        {
            transform.Translate(new Vector3(0.5f, 0, 0));
        }
    }
}