Unity类银河恶魔城学习记录7-4 P70 Improving sword‘s behaviour源代码

Alex教程每一P的教程原代码加上我自己的理解初步理解写的注释，可供学习Alex教程的人参考
此代码仅为较上一P有所改变的代码

【Unity教程】从0编程制作类银河恶魔城游戏_哔哩哔哩_bilibili

Sword_Skill_Controller.cs

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

public class Sword_Skill_Controller : MonoBehaviour
{
    [SerializeField] private float returnSpeed = 12;
    private bool isReturning;

    private Animator anim;
    private Rigidbody2D rb;
    private CircleCollider2D cd;
    private Player player;

    private bool canRotate = true;
    
    
    private void Awake()
    {
        anim = GetComponentInChildren<Animator>();
        rb = GetComponent<Rigidbody2D>();
        cd = GetComponent<CircleCollider2D>();
    }
    public void ReturnSword()
    {
        rb.isKinematic = true;
        transform.parent = null;
        isReturning = true;
    }
    public void SetupSword(Vector2 _dir,float _gravityScale,Player _player)
    {
        player = _player;
        rb.velocity = _dir;
        rb.gravityScale = _gravityScale;
        anim.SetBool("Rotation", true);
    }

    private void Update()
    {
        if(canRotate)
        transform.right = rb.velocity;//使武器随着速度而改变朝向

        if (isReturning)
        {
            transform.position = Vector2.MoveTowards(transform.position, player.transform.position, returnSpeed * Time.deltaTime);//从原来的位置返回到player的位置
                                                                                                                                 //并且随着时间增加而增加速度
            if(Vector2.Distance(transform.position,player.transform.position)<1)//当剑与player的距离小于一定距离，清除剑
            {
                player.ClearTheSword();
            }
        }                                                                                                       
    }

  
    private void OnTriggerEnter2D(Collider2D collision)//传入碰到的物体的碰撞器
    {
        canRotate = false;
        cd.enabled = false;//相当于关闭碰撞后触发函数。//https://docs.unity3d.com/cn/current/ScriptReference/Collision2D-enabled.html

        rb.isKinematic = true;//开启物理学反应 https://docs.unity3d.com/cn/current/ScriptReference/Rigidbody2D-isKinematic.html
        rb.constraints = RigidbodyConstraints2D.FreezeAll;//冻结所有移动

        transform.parent = collision.transform;//设置sword的父组件为碰撞到的物体
        anim.SetBool("Rotation", false);
    }//打开IsTrigger时才可使用该函数
     //https://docs.unity3d.com/cn/current/ScriptReference/Collider2D.OnTriggerEnter2D.html
}

Sword_Skill.cs

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

public class Sword_Skill : Skill
{
    [Header("Skill Info")]
    [SerializeField] private GameObject swordPrefab;//sword预制体
    [SerializeField] private Vector2 launchForce;//发射力度
    [SerializeField] private float swordGravity;//发射体的重力

    private Vector2 finalDir;//发射方向

    [Header("Aim dots")]
    [SerializeField] private int numberOfDots;//需要的点的数量
    [SerializeField] private float spaceBetweenDots;//相隔的距离
    [SerializeField] private GameObject dotPrefab;//dot预制体
    [SerializeField] private Transform dotsParent;//不是很懂

    private GameObject[] dots;//dot组

    protected override void Start()
    {
        base.Start();

        GenerateDots();//生成点函数
    }
    protected override void Update()
    {
        base.Update();
        if (Input.GetKeyUp(KeyCode.Mouse1))
        {
            finalDir = new Vector2(AimDirection().normalized.x * launchForce.x, AimDirection().normalized.y * launchForce.y);
            //将位移量改为单位向量分别与力度的x，y相乘作为finalDir

        }

        if(Input.GetKey(KeyCode.Mouse1))
        {
            for (int i = 0; i < dots.Length;i++)
            {
                dots[i].transform.position = DotsPosition(i * spaceBetweenDots);//用循环为每个点以返回值赋值（传入值为每个点的顺序i*点间距
            }
        }
    }
    public void CreateSword()
    {
        GameObject newSword = Instantiate(swordPrefab, player.transform.position, transform.rotation);//创造实例，初始位置为此时player的位置
        Sword_Skill_Controller newSwordScript = newSword.GetComponent<Sword_Skill_Controller>();//获得Controller
        newSwordScript.SetupSword(finalDir, swordGravity,player);//调用Controller里的SetupSword函数，给予其速度和重力和player实例

        player.AssignNewSword(newSword);//调用在player中保存通过此方法创造出的sword实例
        DotsActive(false);//关闭点的显示
    }

    public Vector2 AimDirection()
    {
        Vector2 playerPosition = player.transform.position;//拿到玩家此时的位置
        Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);//https://docs.unity3d.com/cn/current/ScriptReference/Camera.ScreenToWorldPoint.html
                                                                                    //大概就是返回屏幕上括号里的参数的位置，这里返回了鼠标的位置
                                                                                    //拿到此时鼠标的位置
        Vector2 direction = mousePosition - playerPosition;//获得距离的绝对向量

        return direction;//返回距离向量
    }

    public void DotsActive(bool _isActive)
    {
        for(int i = 0;i<dots.Length;i++)
        {
            dots[i].SetActive(_isActive);//设置每个点是否显示函数
        }
    }
    private void GenerateDots()//生成点函数
    {
        dots = new GameObject[numberOfDots];//为dot赋予实例数量
        for(int i = 0;i < numberOfDots;i++)
        {
            dots[i] = Instantiate(dotPrefab, player.transform.position, Quaternion.identity,dotsParent);//对象与世界轴或父轴完全对齐
            //https://docs.unity3d.com/cn/current/ScriptReference/Quaternion-identity.html
            dots[i].SetActive(false);//关闭dot
        }
    }
    
    private Vector2 DotsPosition(float t)//传入顺序相关的点间距
    {
        Vector2 position = (Vector2)player.transform.position + 
            new Vector2
            (AimDirection().normalized.x * launchForce.x,
             AimDirection().normalized.y * launchForce.y) * t  //基本间距
             + .5f * (Physics2D.gravity * swordGravity) * (t * t)//重力影响
             ;
        //t是控制之间点间距的
        return position;//返回位置
    }//设置点间距函数
}

Player.cs

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;

public class Player : Entity
{
    [Header("Attack Details")]
    public Vector2[] attackMovement;//每个攻击时获得的速度组
    public float counterAttackDuration = .2f;
    


    public bool isBusy{ get; private set; }//防止在攻击间隔中进入move
    //
    [Header("Move Info")]
    public float moveSpeed;//定义速度，与xInput相乘控制速度的大小
    public float jumpForce;
    [Header("Dash Info")]
    [SerializeField] private float dashCooldown;
    private float dashUsageTimer;//为dash设置冷却时间，在一定时间内不能连续使用
    public float dashSpeed;//冲刺速度
    public float dashDuration;//持续时间
    public float dashDir { get; private set; }


    
    
    #region 定义States
    public PlayerStateMachine stateMachine { get; private set; }
    public PlayerIdleState idleState { get; private set; }
    public PlayerMoveState moveState { get; private set; }
    public PlayerJumpState jumpState { get; private set; }
    public PlayerAirState airState { get; private set; }
    public PlayerDashState dashState { get; private set; }
    public PlayerWallSlideState wallSlide { get; private set; }
    public PlayerWallJumpState wallJump { get; private set; }
    


    public PlayerPrimaryAttackState primaryAttack { get; private set; }
    public PlayerCounterAttackState counterAttack { get; private set; }

    public PlayerAimSwordState aimSword { get; private set; 
    }public PlayerCatchSwordState catchSword { get; private set; }

    public SkillManager skill { get; private set; }
    public GameObject sword;//{ get; private set; }声明sword
    #endregion
    protected override void Awake()
    {

        base.Awake();
        stateMachine = new PlayerStateMachine();
        //通过构造函数，在构造时传递信息
        idleState = new PlayerIdleState(this, stateMachine, "Idle");
        moveState = new PlayerMoveState(this, stateMachine, "Move");
        jumpState = new PlayerJumpState(this, stateMachine, "Jump");
        airState = new PlayerAirState(this, stateMachine, "Jump");
        dashState = new PlayerDashState(this, stateMachine, "Dash");
        wallSlide = new PlayerWallSlideState(this, stateMachine, "WallSlide");
        wallJump = new PlayerWallJumpState(this, stateMachine, "Jump");//wallJump也是Jump动画


        primaryAttack = new PlayerPrimaryAttackState(this, stateMachine, "Attack");
        counterAttack = new PlayerCounterAttackState(this, stateMachine, "CounterAttack");

        aimSword = new PlayerAimSwordState(this,stateMachine, "AimSword");
        catchSword = new PlayerCatchSwordState(this, stateMachine, "CatchSword");

        //this 就是 Player这个类本身
    }//Awake初始化所以State，为所有State传入各自独有的参数，及animBool，以判断是否调用此动画（与animatoin配合完成）
    protected override void Start()
    {
        base.Start();
        stateMachine.Initialize(idleState);
        skill = SkillManager.instance;

    }

    protected override void Update()//在mano中update会自动刷新但其他没有mano的不会故，需要在这个updata中调用其他脚本中的函数stateMachine.currentState.update以实现 //stateMachine中的update

    {
        base.Update();
        stateMachine.currentState.Update();//反复调用CurrentState的Update函数
        CheckForDashInput();
        
    }
    public void AssignNewSword(GameObject _newSword)//保持创造的sword实例的函数
    {
        sword = _newSword;
    }

    public void ClearTheSword()
    {
        Destroy(sword);
    }

    public IEnumerator BusyFor(float _seconds)//https://www.zhihu.com/tardis/bd/art/504607545?source_id=1001
    {
        isBusy = true;
        yield return new WaitForSeconds(_seconds);
        isBusy = false;
    
    }//p39 4.防止在攻击间隔中进入move,通过设置busy值，在使用某些状态时，使其为busy为true，抑制其进入其他state
     //IEnumertor本质就是将一个函数分块执行，只有满足某些条件才能执行下一段代码，此函数有StartCoroutine调用
    public void AnimationTrigger() => stateMachine.currentState.AnimationFinishTrigger();
    //从当前状态拿到AnimationTrigger进行调用的函数

    public void CheckForDashInput()
    {

        
        if (IsWallDetected())
        {
            return;
        }//修复在wallslide可以dash的BUG
        if (Input.GetKeyDown(KeyCode.LeftShift) && skill.dash.CanUseSkill())//将DashTimer<0 的判断 改成DashSkill里的判断
        {

            
            dashDir = Input.GetAxisRaw("Horizontal");//设置一个值，可以将dash的方向改为你想要的方向而不是你的朝向
            if (dashDir == 0)
            {
                dashDir = facingDir;//只有当玩家没有控制方向时才使用默认朝向
            }
            stateMachine.ChangeState(dashState);
        }

    }//将Dash切换设置成一个函数，使其在所以情况下都能使用
    
   
    
}

PlayerGroundState.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
//GroundState用于保证只有在Idle和Move这两个地面状态下才能调用某些函数，并且稍微减少一点代码量
public class PlayerGroundState : PlayerState
{
    public PlayerGroundState(Player _player, PlayerStateMachine _stateMachine, string _animBoolName) : base(_player, _stateMachine, _animBoolName)
    {
    }

    public override void Enter()
    {
        base.Enter();
    }

    public override void Exit()
    {
        base.Exit();
    }
    public override void Update()
    {
        base.Update();
        if(Input.GetKeyDown(KeyCode.Mouse1)&&HasNoSword())//点击右键进入瞄准状态，当sword存在时，不能进入aim状态
        {
            stateMachine.ChangeState(player.aimSword);
        }
        if(Input.GetKeyDown(KeyCode.Q))//摁Q进入反击状态
        {
            stateMachine.ChangeState(player.counterAttack);
        }
        if(Input.GetKeyDown(KeyCode.Mouse0))//p38 2.从ground进入攻击状态
        {
            stateMachine.ChangeState(player.primaryAttack);
        }
        if(player.IsGroundDetected()==false)
        {
            stateMachine.ChangeState(player.airState);
        }// 写这个是为了防止在空中直接切换为moveState了。

        if (Input.GetKeyDown(KeyCode.Space) && player.IsGroundDetected())
        {
            stateMachine.ChangeState(player.jumpState);
        }//空格切换为跳跃状态


    }
    private bool HasNoSword()//用这个函数同时控制了是否能进入aimSword和如果sword存在便使他回归player的功能
    {
        if(!player.sword)
        {
            return true;
        }
        player.sword.GetComponent<Sword_Skill_Controller>().ReturnSword();
        return false;
    }
}