How to implement Snake Game in WeChat Mini Program

This article mainly introduces the Snake game implemented by the WeChat applet, and analyzes the related interface layout and code logic operation skills of the WeChat applet to implement the Snake game function in the form of examples. It also comes with source code for readers to download for reference. Friends can refer to it, I hope it can help everyone.

The example in this article describes the Snake game implemented by WeChat applet. Share it with everyone for your reference, the details are as follows:

Let’s take a look at the running effect first:

The specific code is as follows:

Interface layout pages/snake/snake/snake.wxml:

<!--snake.wxml-->
<view class="control" bindtouchstart="tapStart" bindtouchmove="tapMove" bindtouchend="tapEnd">
<view class="score">
  <view class="title">snake</view>
  <view class="scoredetail">
    <view class="scoredesc">得分</view>
    <view class="scorenumber">{{score}}</view>
  </view>
  <view class="scoredetail">
    <view class="scoredesc">历史最高</view>
    <view class="scorenumber">{{maxscore}}</view>
  </view>
</view>
<view class="ground">
  <view wx:for="{{ground}}" class="rows" wx:for-item="cols">
    <view wx:for="{{cols}}" class="block block_{{item}}" >
    </view>
  </view>
</view>
<modal class="modal" hidden="{{modalHidden}}" no-cancel bindconfirm="modalChange">
 <view> 游戏结束，重新开始吗？ </view>
</modal>
</view>

Logical function pages/snake/snake/snake.js:

//snake.js
var app = getApp();
Page({
  data:{
    score: 0,//比分
    maxscore: 0,//最高分
    startx: 0,
    starty: 0,
    endx:0,
    endy:0,//以上四个做方向判断来用
    ground:[],//存储操场每个方块
    rows:28,
    cols:22,//操场大小
    snake:[],//存蛇
    food:[],//存食物
    direction:'',//方向
    modalHidden: true,
    timer:''
  } ,
  onLoad:function(){
    var maxscore = wx.getStorageSync('maxscore');
    if(!maxscore) maxscore = 0
    this.setData({
    maxscore:maxscore
    });
    this.initGround(this.data.rows,this.data.cols);//初始化操场
    this.initSnake(3);//初始化蛇
    this.creatFood();//初始化食物
    this.move();//蛇移动
  },
  //计分器
  storeScore:function(){
   if(this.data.maxscore < this.data.score){
   this.setData({
    maxscore:this.data.score
    })
    wx.setStorageSync(&#39;maxscore&#39;, this.data.maxscore)
   }
 },
 //操场
  initGround:function(rows,cols){
    for(var i=0;i<rows;i++){
      var arr=[];
      this.data.ground.push(arr);
      for(var j=0;j<cols;j++){
        this.data.ground[i].push(0);
      }
    }
  },
  //蛇
  initSnake:function(len){
    for(var i=0;i<len;i++){
      this.data.ground[0][i]=1;
      this.data.snake.push([0,i]);
    }
  },
  //移动函数
  move:function(){
    var that=this;
    this.data.timer=setInterval(function(){
      that.changeDirection(that.data.direction);
      that.setData({
        ground:that.data.ground
      });
    },400);
  },
  tapStart: function(event){
    this.setData({
      startx: event.touches[0].pageX,
      starty: event.touches[0].pageY
      })
  },
  tapMove: function(event){
    this.setData({
      endx: event.touches[0].pageX,
      endy: event.touches[0].pageY
      })
  },
  tapEnd: function(event){
    var heng = (this.data.endx) ? (this.data.endx - this.data.startx) : 0;
    var shu = (this.data.endy) ? (this.data.endy - this.data.starty) : 0;
    if(Math.abs(heng) > 5 || Math.abs(shu) > 5){
      var direction = (Math.abs(heng) > Math.abs(shu)) ? this.computeDir(1, heng):this.computeDir(0, shu);
      switch(direction){
      case &#39;left&#39;:
        if(this.data.direction==&#39;right&#39;)return;
        break;
      case &#39;right&#39;:
        if(this.data.direction==&#39;left&#39;)return;
        break;
      case &#39;top&#39;:
        if(this.data.direction==&#39;bottom&#39;)return;
        break;
      case &#39;bottom&#39;:
        if(this.data.direction==&#39;top&#39;)return;
        break;
      default:
    }
    this.setData({
    startx:0,
    starty:0,
    endx:0,
    endy:0,
    direction:direction
    })
  }
  },
  computeDir: function(heng, num){
  if(heng) return (num > 0) ? &#39;right&#39; : &#39;left&#39;;
  return (num > 0) ? &#39;bottom&#39; : &#39;top&#39;;
  },
  creatFood:function(){
    var x=Math.floor(Math.random()*this.data.rows);
    var y=Math.floor(Math.random()*this.data.cols);
    var ground= this.data.ground;
    ground[x][y]=2;
    this.setData({
      ground:ground,
      food:[x,y]
    });
  },
  changeDirection:function(dir){
    switch(dir){
    case &#39;left&#39;:
      return this.changeLeft();
      break;
    case &#39;right&#39;:
      return this.changeRight();
      break;
    case &#39;top&#39;:
      return this.changeTop();
      break;
    case &#39;bottom&#39;:
      return this.changeBottom();
      break;
    default:
    }
  },
  changeLeft:function(){
    var arr=this.data.snake;
    var len=this.data.snake.length;
    var snakeHEAD=arr[len-1][1];
    var snakeTAIL=arr[0];
    var ground=this.data.ground;
    ground[snakeTAIL[0]][snakeTAIL[1]]=0; 
    for(var i=0;i<len-1;i++){
        arr[i]=arr[i+1];  
    };
    var x=arr[len-1][0];
    var y=arr[len-1][1]-1;
    arr[len-1]=[x,y];
      this.checkGame(snakeTAIL);
    for(var i=1;i<len;i++){
      ground[arr[i][0]][arr[i][1]]=1;
    } 
  this.setData({
        ground:ground,
      snake:arr
    });
    return true;
  },
  changeRight:function(){
    var arr=this.data.snake;
    var len=this.data.snake.length;
    var snakeHEAD=arr[len-1][1];
    var snakeTAIL=arr[0];
    var ground=this.data.ground;
    ground[snakeTAIL[0]][snakeTAIL[1]]=0; 
    for(var i=0;i<len-1;i++){
        arr[i]=arr[i+1];  
    };
    var x=arr[len-1][0];
    var y=arr[len-1][1]+1;
    arr[len-1]=[x,y];
    this.checkGame(snakeTAIL);
    for(var i=1;i<len;i++){
      ground[arr[i][0]][arr[i][1]]=1;
    } 
    this.setData({
        ground:ground,
      snake:arr
    });
  //  var y=this.data.snake[0][1];
  //  var x=this.data.snake[0][0];
  //   this.data.ground[x][y]=0;
  //   console.log(this.data.ground[x]);
  //   console.log(this.data.snake);
  //   for(var i=0;i<this.data.snake.length-1;i++){
  //     this.data.snake[i]=this.data.snake[i+1];
  //   }
  //   this.data.snake[this.data.snake.length-1][1]++;
  //   for(var j=1;j<this.data.snake.length;j++){
  //     this.data.ground[this.data.snake[j][0]][this.data.snake[j][1]]=1;
  //   }
    return true;
  },
  changeTop:function(){
    var arr=this.data.snake;
    var len=this.data.snake.length;
    var snakeHEAD=arr[len-1][1];
    var snakeTAIL=arr[0];
    var ground=this.data.ground;
    ground[snakeTAIL[0]][snakeTAIL[1]]=0; 
    for(var i=0;i<len-1;i++){
        arr[i]=arr[i+1];  
    };
    var x=arr[len-1][0]-1;
    var y=arr[len-1][1];
    arr[len-1]=[x,y];
      this.checkGame(snakeTAIL);
    for(var i=1;i<len;i++){
      ground[arr[i][0]][arr[i][1]]=1;
    } 
    this.setData({
      ground:ground,
      snake:arr
    });
    return true;
  },
  changeBottom:function(){
    var arr=this.data.snake;
    var len=this.data.snake.length;
    var snakeHEAD=arr[len-1];
    var snakeTAIL=arr[0];
    var ground=this.data.ground;
    ground[snakeTAIL[0]][snakeTAIL[1]]=0; 
    for(var i=0;i<len-1;i++){
        arr[i]=arr[i+1];  
    };
    var x=arr[len-1][0]+1;
    var y=arr[len-1][1];
    arr[len-1]=[x,y];
    this.checkGame(snakeTAIL);
    for(var i=1;i<len;i++){
      ground[arr[i][0]][arr[i][1]]=1;
    } 
    this.setData({
      ground:ground,
      snake:arr
    });
    return true;
  },
  checkGame:function(snakeTAIL){
    var arr=this.data.snake;
    var len=this.data.snake.length;
    var snakeHEAD=arr[len-1];
    if(snakeHEAD[0]<0||snakeHEAD[0]>=this.data.rows||snakeHEAD[1]>=this.data.cols||snakeHEAD[1]<0){
        clearInterval(this.data.timer);
          this.setData({
          modalHidden: false,
            }) 
    }
    for(var i=0;i<len-1;i++){
      if(arr[i][0]==snakeHEAD[0]&&arr[i][1]==snakeHEAD[1]){
        clearInterval(this.data.timer);
          this.setData({
            modalHidden: false,
          })
      }
    }
    if(snakeHEAD[0]==this.data.food[0]&&snakeHEAD[1]==this.data.food[1]){
      arr.unshift(snakeTAIL);
      this.setData({
        score:this.data.score+10
      });
      this.storeScore();
      this.creatFood();
    }
  },
  modalChange:function(){
  this.setData({
      score: 0,
    ground:[],
    snake:[],
      food:[],
      modalHidden: true,
      direction:&#39;&#39;
  })
  this.onLoad();
  }
});

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