利用unity實現簡單的貪喫蛇遊戲

首先創建一個頭部，編寫腳本利用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(-1,0,0);
    Vector3 right=new Vector3(1,0,0);
    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爲頭部大小）。
            timer = 0;
            transform.position = 0.5f * now + transform.position;

        }

    }

然後就是創建初始身體，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。

創建初始身體，並放入數組。

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];
            }

        }

    }

初始蛇創建好後，就開始添加食物，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。
創建食物

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);
    }

完整代碼

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(0,1,0);
    Vector3 down=new Vector3(0,-1,0);
    Vector3 left=new Vector3(-1,0,0);
    Vector3 right=new Vector3(1,0,0);
    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, transform.position-(i+1)*new Vector3(0,0.5f,0),Quaternion.identity)as GameObject;
            snakeBody.Add (newbodynext);
        }
    }
    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);
    }

    // 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,snakeBody[snakeBody.Count-1].transform.position,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);
    }
}

將該腳本掛載在頭部對象上然後添加身體和食物預設體，再添加邊界即可。