写一个Unity 2D 寻路算法（ 平台 跳跃）

以下是一个简单的Unity 2D寻路算法示例，用于平台跳跃游戏：

1. 创建一个空物体作为寻路管理器，将以下脚本附加到该物体上：

using UnityEngine;
using System.Collections.Generic;

public class PathfindingManager : MonoBehaviour {

    private List<Vector2> path = new List<Vector2>();

    public List<Vector2> FindPath(Vector2 start, Vector2 target) {

        // 使用A星算法来查找路径
        // ...

        return path;
    }

}

2. 创建一个角色并附加以下脚本：

using UnityEngine;
using System.Collections.Generic;

public class CharacterController2D : MonoBehaviour {

    public float speed = 5.0f;
    public float jumpForce = 500.0f;

    private Rigidbody2D rigidBody;
    private bool isGrounded = false;
    private PathfindingManager pathfindingManager;
    private List<Vector2> currentPath;
    private int currentPathIndex = 0;

    void Start() {
        rigidBody = GetComponent<Rigidbody2D>();
        pathfindingManager = FindObjectOfType<PathfindingManager>();
    }

    void Update() {
        // 移动
        float horizontal = Input.GetAxis("Horizontal");
        rigidBody.velocity = new Vector2(horizontal * speed, rigidBody.velocity.y);

        // 跳跃
        if (Input.GetKeyDown(KeyCode.Space) && isGrounded) {
            rigidBody.AddForce(new Vector2(0, jumpForce));
            isGrounded = false;
        }

        // 跟随路径
        if (currentPath != null && currentPathIndex < currentPath.Count) {
            Vector2 target = currentPath[currentPathIndex];
            float distance = Vector2.Distance(transform.position, target);
            if (distance < 0.1f) {
                currentPathIndex++;
            } else {
                Vector2 direction = target - (Vector2)transform.position;
                rigidBody.velocity = new Vector2(direction.normalized.x * speed, rigidBody.velocity.y);
            }
        }
    }

    void OnCollisionEnter2D(Collision2D other) {
        // 判断是否着陆
        if (other.gameObject.layer == LayerMask.NameToLayer("Ground")) {
            isGrounded = true;
        }
    }

    void OnTriggerEnter2D(Collider2D other) {
        // 当角色进入触发器时，重新计算路径
        if (other.gameObject.layer == LayerMask.NameToLayer("PathfindingTarget")) {
            Vector2 target = other.gameObject.transform.position;
            currentPath = pathfindingManager.FindPath(transform.position, target);
            currentPathIndex = 0;
        }
    }

}

3. 创建一个地图，包括地面和路径目标。地面需要标记为“Ground”层，路径目标需要标记为“PathfindingTarget”层。

现在，当角色进入路径目标的触发器时，路径将被重新计算，并且角色将沿着路径移动。注意，这只是一个简单的示例，你需要根据你的游戏逻辑和地图设计进行修改和扩展。