Unity 横版2D 游戏开发学习笔记 - 13：爬梯子功能，并总结瓦片开发规范

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

public class PlayerController : MonoBehaviour
{
    public float runSpeed = 5;
    public float jumpSpeed = 7;
    public float HP = 5;
    private Rigidbody2D rigidbody2D;
    private Animator animator;

    private BoxCollider2D myFeet;      // 玩家的脚部设置了box碰撞体用于判断和地面接触、和梯子接触等

    public float climbingSpeed = 5;   // 爬梯子的速度
    private bool isLadder;        // 判断是否为梯子
    private bool isClimbing;      // 是否正在爬梯子

    private float palyerGravity;  // 初始重力，从梯子上下来后恢复使用

    private bool isJumping;   // 是否一段跳
    //private bool isFalling;   // 是否一段跳掉落

    // Start is called before the first frame update
    void Start()
    {
        rigidbody2D = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();

        myFeet = GetComponent<BoxCollider2D>();

        palyerGravity = rigidbody2D.gravityScale;
    }

    // Update is called once per frame
    void Update()
    {
        float moveDir = Input.GetAxis("Horizontal");   // 水平轴，-1～1之间的值

        // 通过刚体控制GameObject 位移
        Vector2 playerVel = new Vector2(moveDir * runSpeed, rigidbody2D.velocity.y);
        rigidbody2D.velocity = playerVel;

        // 当按下【A】、【D】时移动
        if (moveDir > 0.01 || moveDir < -0.01)
        {
            // 通过动画控制器切换动作
            animator.SetBool("Run", true);
            Debug.Log("Run");
        }

        Debug.Log("moveDir: " + moveDir);

        // Run运动停止
        if (moveDir > -0.01 && moveDir < 0.01)
        {
            animator.SetBool("Run", false);

            Debug.Log("Idle");
            if (true != animator.GetBool("Idle"))
            {
                animator.SetBool("Idle", true);
            }
        }

        // 按下【Space】，进行跳跃
        if (Input.GetKeyDown(KeyCode.Space))
        {
            animator.SetBool("Jump", true);

            // 位置上移，给玩家y方向赋值（jumpSpeed暂定为7，具体值需要调整）
            rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, jumpSpeed);

            //Debug.Log(rigidbody2D.velocity);

            // 通过协程控制，一定时间后跳跃结束
            StartCoroutine(StopJumpCoroutine());
        }

        // 判断是否遇到了梯子
        isLadder = myFeet.IsTouchingLayers(LayerMask.GetMask("Ladder"));
        //Debug.Log("isLadder: " + isLadder);

        // 判断玩家的一些状态
        isClimbing = animator.GetBool("Climbing");  // 是否正在爬梯子
        isJumping = animator.GetBool("Jump");

        // 按下上下键触发爬梯子逻辑
        if (isLadder)   // 是否在梯子旁边
        {
            float moveY = Input.GetAxis("Vertical");   // 垂直轴，-1～1之间的值
            //Debug.Log("moveY: " + moveY);
            // 大于0.5向上爬；小于0.5向下爬
            if (moveY > 0.5f || moveY < -0.5f)
            {
                animator.SetBool("Climbing", true);
                rigidbody2D.gravityScale = 0.0f;   // 爬梯子的时候不能有重力，将重力改为0，不受重力影响
                rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, moveY * climbingSpeed);
            }
            else
            {
                // 如果正在跳跃从梯子
                if (isJumping)
                {
                    animator.SetBool("Climbing", false);
                }
                else
                {
                    // 停在梯子上面
                    animator.SetBool("Climbing", true); // TODO 缺少在梯子上不动的动作
                    rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, 0.0f);
                }
            }
        }
        else
        {
            animator.SetBool("Climbing", false);
            // 如果不在梯子上面，恢复重力
            rigidbody2D.gravityScale = palyerGravity;
        }
    }


    public void Damage(int damage)
    {
        HP -= damage;
        if (HP <= 0)
        {
            this.gameObject.SetActive(false);
        }
    }


    IEnumerator StopJumpCoroutine()
    {
        yield return new WaitForSeconds(0.8f);
        animator.SetBool("Jump", false);
    }
}