本文例項為大家分享了unity實現貪吃蛇遊戲的具體程式碼，供大家參考，具體內容如下

首先建立一個頭部，編寫指令碼利用WASD控制頭部的移動。

Vector3 up=new Vector3(0,1,0);
Vector3 down=new Vector3(0,-1,0);
Vector3 left=new Vector3(-1,0);
Vector3 right=new Vector3(1,0);
Vector3 now;//頭部實際前進方向

  float timer=0f;
  float timerGap=0.1f;
  void Start () 
  {
    now = up;
  }
  void Update () 
  {
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.W))
    {
      now = up;
    }
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.S))
    {
      now = down;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.A))
    {
      now=left;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.D))
    {
      now = right;
    }

    timer += Time.deltaTime;

    if (timer > timerGap) 
    {
      //每隔0.1s向當前方向移動一個單位（0.5為頭部大小）。
      timer = 0;
      transform.position = 0.5f * now + transform.position;

    }

  }

然後就是建立初始身體，實現身體跟隨頭部。採用的方法是將身體放進一個數組，然後下標0的身體移動到頭部之前的位置，然後下標 i 的身體移動到 i-1 的position。

建立初始身體，並放入陣列。

public GameObject body;//身體預設體
List<GameObject> snakeBody = new List<GameObject>(); 

  void Awake()
  {
    for (int i = 0; i < 3; ++i) 
    {
      GameObject newbodynext=Instantiate (body,transform.position-(i+1)*new Vector3(0,0.5f,0),Quaternion.identity)as GameObject;
      snakeBody.Add (newbodynext);
    }
  }

實現跟隨

void Update () 
  {
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.W))
    {
      now = up;
    }
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.S))
    {
      now = down;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.A))
    {
      now=left;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.D))
    {
      now = right;
    }

    timer += Time.deltaTime;

    if (timer > timerGap) 
    {
      Vector3 tmpPosition = transform.position;//記錄頭部變化前的位置
      List<Vector3> tmpList = new List<Vector3> ();//記錄身體變化前的位置 

      for (int i = 0; i < snakeBody.Count; ++i) 
      {
        tmpList.Add (snakeBody [i].transform.position);
      }

      timer = 0;


      transform.position = 0.5f * now + transform.position;

      snakeBody [0].transform.position = tmpPosition;//將0移到頭部之前的位置


      //依次前移身體的位置
      for (int i = 1; i < snakeBody.Count; ++i) 
      {
        snakeBody [i].transform.position = tmpList [i - 1];
      }

    }

}

初始蛇建立好後，就開始新增食物，和增長蛇的身體。還有檢測遊戲失敗，即撞到身體或者邊界，採用事件觸發檢測完成。

建立食物

public GameObject foodPrefab;//食物預設體
void Start () {
    now = up;

    createFood ();


  }

  void createFood()
  {

    float x = Random.Range(-6.5f,6.5f);
    float y = Random.Range(-4.5f,4.5f);          
    Instantiate(foodPrefab,new Vector3(x,y,0f),Quaternion.identity);
  }

觸發檢測

void OnTriggerEnter(Collider other) 
  {  //這個other就是被碰撞體

    if (other.gameObject.tag.Equals("Food")) 
    {

      Destroy(other.gameObject);

      GameObject newbodynext = Instantiate (body,snakeBody[snakeBody.Count-1].transform.position,Quaternion.identity)as GameObject;

      snakeBody.Add (newbodynext);//增加蛇的身體
      createFood();
    }
    else if(other.gameObject.tag.Equals("Body"))
    {
      SceneManager.LoadScene("Snake",LoadSceneMode.Single);//重新開始
    }
  }


  void OnTriggerExit(Collider other)
  {
    if (other.gameObject.tag.Equals("Boundary")) 
      SceneManager.LoadScene("Snake",LoadSceneMode.Single);
  }

完整程式碼

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class HeadMove : MonoBehaviour {



  public GameObject body;
  public GameObject foodPrefab;


  Vector3 up=new Vector3(0,0);
  Vector3 down=new Vector3(0,0);
  Vector3 left=new Vector3(-1,0);
  Vector3 right=new Vector3(1,0);
  Vector3 now;


  float timer=0f;
  float timerGap=0.1f;

  List<GameObject> snakeBody = new List<GameObject>();  
  // Use this for initialization

  void Awake()
  {
    for (int i = 0; i < 3; ++i) 
    {
      GameObject newbodynext=Instantiate (body,Quaternion.identity)as GameObject;
      snakeBody.Add (newbodynext);
    }
  }
  void Start () {
    now = up;

    createFood ();


  }

  void createFood()
  {

    float x = Random.Range(-6.5f,Quaternion.identity);
  }

  // Update is called once per frame
  void Update () 
  {
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.W))
    {
      now = up;
    }
    if (now!=up&&now!=down&&Input.GetKey (KeyCode.S))
    {
      now = down;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.A))
    {
      now=left;
    }
    if (now!=left&&now!=right&&Input.GetKey (KeyCode.D))
    {
      now = right;
    }

    timer += Time.deltaTime;

    if (timer > timerGap) 
    {
      Vector3 tmpPosition = transform.position;
      List<Vector3> tmpList = new List<Vector3> (); 

      for (int i = 0; i < snakeBody.Count; ++i) 
      {
        tmpList.Add (snakeBody [i].transform.position);
      }

      timer = 0;


      transform.position = 0.5f * now + transform.position;

      snakeBody [0].transform.position = tmpPosition;


      for (int i = 1; i < snakeBody.Count; ++i) 
      {
        snakeBody [i].transform.position = tmpList [i - 1];
      }

    }

  }



  void OnTriggerEnter(Collider other) 
  {  //這個other就是被碰撞體

    if (other.gameObject.tag.Equals("Food")) 
    {

      Destroy(other.gameObject);
      GameObject newbodynext = Instantiate (body,Quaternion.identity)as GameObject;
      snakeBody.Add (newbodynext);
      createFood();
    }
    //由於身體和頭部一開始就接觸，所以將身體的碰撞半徑減小到0.4
    else if(other.gameObject.tag.Equals("Body"))
    {
      SceneManager.LoadScene("Snake",LoadSceneMode.Single);
    }
  }


  void OnTriggerExit(Collider other)
  {
    if (other.gameObject.tag.Equals("Boundary")) 
      SceneManager.LoadScene("Snake",LoadSceneMode.Single);
  }
}

將該指令碼掛載在頭部物件上然後新增身體和食物預設體，再新增邊界即可。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。