从零开始的类银河恶魔城游戏03

[自学]从零开始的类银河恶魔城游戏03

part 3：Jump with State Machine 2025/1/28

状态机

状态机转换图

//PlayerGroundedState.cs

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

public class PlayerGroundedState : PlayerState
{
    public PlayerGroundedState(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.Space))
        {
            stateMachine.ChangeState(player.jumpState);
        }
    }
}
//PlayerJumpState.cs

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

public class PlayerJumpState : PlayerState
{
    public PlayerJumpState(Player _player, PlayerStateMachine _stateMachine, string _animBoolName) : base(_player, _stateMachine, _animBoolName)
    {
    }

    public override void Enter()
    {
        base.Enter();
        rb.velocity = new Vector2(rb.velocity.x, player.jumpForce);  //
    }

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

    public override void Update()
    {
        base.Update();

        if (rb.velocity.y < 0)
        {
            stateMachine.ChangeState(player.airState);
        }

    }
}
//PlayerAirState.cs

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

public class PlayerAirState : PlayerState
{
    public PlayerAirState(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 (rb.velocity.y == 0)
        {
            stateMachine.ChangeState(player.idleState);
        }
    }
}
//PlayerMoveState.cs

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

public class PlayerMoveState : PlayerGroundedState
{
    public PlayerMoveState(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();

        player.SetVelocity(xInput * player.moveSpeed, rb.velocity.y);
        if (xInput == 0)
        {
            player.stateMachine.ChangeState(player.idleState);
        }

    }
}
//PlayerIdleState.cs
//PlayerStateMachine.cs
//PlayerState.cs
//Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor.Callbacks;
using UnityEngine;

public class Player: MonoBehaviour
{
    [Header("Move info")]
    public float moveSpeed = 8f;
    public float jumpForce = 15f;  //

    #region Components
    public Animator anim { get; private set; }
    public Rigidbody2D rb { get; private set; }
    #endregion

    #region 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; }  //


    #endregion

    private void Awake()
    {
        stateMachine = new PlayerStateMachine();

        idleState = new PlayerIdleState(this,stateMachine,"Idle");
        moveState = new PlayerMoveState(this,stateMachine,"Move");
        jumpState = new PlayerJumpState(this,stateMachine,"Jump");  //
        airState = new PlayerAirState(this,stateMachine,"Jump");  //
    }

    public void Start()
    {
        anim = GetComponentInChildren<Animator>();
        rb = GetComponent<Rigidbody2D>();
        stateMachine.Initialize(idleState);// PlayerStateMachine.Initialize()
    }

    public void Update()
    {
        stateMachine.currentState.Update();// PlayerState.Update()
    }

//设置速度
    public void SetVelocity(float _xVelocity, float _yVelocity)
    {
        rb.velocity = new Vector2(_xVelocity,_yVelocity);
    }

}