利用A* Pathfinding项目在unity中实现自动寻路

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

public class EnemyContorller : MonoBehaviour
{
    public float enemyspeed;//敌人速度
    public Transform target;//设置跟随目标
    public float nextWaypointDistance = 3f;//敌人距离一个路标点多近的时候，需要向下一个点移动
    public Animator animator;

    Path path;//储存路径
    int currentWayPoint = 0;//代表在当前路径上，正在朝哪一个路标点移动
    bool reachedEndOfPath = false;//是否到达最后一个点
    Rigidbody2D rigidbody2d;
    Seeker seeker;

    void Start()
    {
        rigidbody2d = GetComponent<Rigidbody2D>();
        seeker = GetComponent<Seeker>();
        enemyCurrentHealth = enemyMaxHealth;

        InvokeRepeating("UpdatePath", 0, 0.5f);//第二个参数，多久第一次调用它，第三个参数，调用速率
    }

    private void UpdatePath()
    {
        if(seeker.IsDone())//如果没有在计算路径，进行下一次更新
           seeker.StartPath(rigidbody2d.position, target.position, OnPathComplete);
        //生成路径，第三个参数为生成路径完成后调用的函数

    }

    void FixedUpdate()
    {
        if (path == null)
            return;//路径为空，退出
        if (currentWayPoint >= path.vectorPath.Count)
        {
            reachedEndOfPath = true;
            return;
        }
        else
        {
            reachedEndOfPath = false;
        }//检查路径点是否走完

        Vector2 direction = ((Vector2)path.vectorPath[currentWayPoint] - rigidbody2d.position).normalized;
        //设置朝向

        animator.SetFloat("Look X", direction.x);
        animator.SetFloat("Look Y", direction.y);
       
        Vector2 force = direction * enemyspeed * Time.deltaTime;//设置力

        animator.SetFloat("Speed", force.magnitude);//播放行走动画

        rigidbody2d.AddForce(force);//给敌人施加力

        float distance = Vector2.Distance(rigidbody2d.position, path.vectorPath[currentWayPoint]);
        //计算到下一个点的距离

        if (distance < nextWaypointDistance)
        {
            currentWayPoint++;
        }//小于，移动到下一个坐标点
    }

    private void OnPathComplete(Path p)
    {
        if(!p.error)
        {
            path = p;
            currentWayPoint = 0;
        }//若路径无错误，使用这个路径
    }
}