using System.Collections;

using System.Collections.Generic;

using System.Linq;

using UnityEngine;

pubic class snake : MonoBehaviour

{

         public List<Transform>  bodylist= new List<Transform> ;

         public GameObject snakebody;

         public Vector3 headpos;

         void Update ()

         {

                   if(foodeating)               //foodeating用来判定是否吃到食物，简略不表

                           grow();

                   move（）；

         }

        void move()

        {

                  headpos = this.transform.position;

                  this.transform.Translate(new Vector3(x,y,z)); //x，y，z的正负判定简略不表

                  if (bodylist.Count > 0)

                 {

                    //方法1

                           bodylist.Last().position = headpos;

                           bodylist.Insert(0, bodylist.Last());

                           bodylist.RemoveAt(bodylist.Count - 1);

                   //方法2

                           for (int i = bodylist.Count - 2; i >= 0; i--)

                                     bodylist[i + 1].position = bodylist[i].position;

                           bodylist[0].position = headpos;

                  }

         }

         void grow()

         {

                 GameObject body = Instantiate(snakebody,new Vector3(2000,2000,0),Quaternion.identity);   //新身体生成在屏幕外

                 bodylist.Add(body.transform);

    }

}