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

public class move01 : MonoBehaviour
{
    public float turnSpeed = 20f;
    Animator m_Animator;
    Rigidbody m_Rigidbody;    
    Vector3 m_Movement;
    Quaternion m_Rotation = Quaternion.identity;

    void Start()
    {
        m_Animator = GetComponent<Animator>();
        m_Rigidbody = GetComponent<Rigidbody>();        
    }

    void FixedUpdate()
    {
        float horizontal = Input.GetAxis("Horizontal");
        float vertical = Input.GetAxis("Vertical");      

        m_Movement.Set(horizontal, 0f, vertical);
        m_Movement.Normalize();
        float vel = Mathf.Sqrt(horizontal * horizontal + vertical * vertical);
        //print("m_Movement.magnitude="+ m_Movement.magnitude.ToString());
        m_Animator.SetFloat("speed",vel);

        bool hasHorizontalInput = !Mathf.Approximately(horizontal, 0f);
        bool hasVerticalInput = !Mathf.Approximately(vertical, 0f);
        bool isWalking = hasHorizontalInput || hasVerticalInput;
        m_Animator.SetBool("IsWalking", isWalking);

        Vector3 desiredForward = Vector3.RotateTowards(transform.forward, m_Movement, turnSpeed * Time.deltaTime, 0f);
        m_Rotation = Quaternion.LookRotation(desiredForward);
    }

    void OnAnimatorMove()
    {
        //1.官網方法：失敗（因為m_Animator.deltaPosition.magnitude=0）
        //m_Rigidbody.MovePosition(m_Rigidbody.position + m_Movement * m_Animator.deltaPosition.magnitude);

        //2.改良方法：令m_Animator.deltaPosition.magnitude=0.05f
        //        m_Rigidbody.MovePosition(m_Rigidbody.position + m_Movement * 0.05f);

        //3.方法3：m_Animator.deltaPosition.magnitude =  m_Movement * Time.fixedDeltaTime
        m_Rigidbody.MovePosition(m_Rigidbody.position + m_Movement * Time.fixedDeltaTime*2.5f);        
        m_Rigidbody.MoveRotation(m_Rotation);
    }
}