This article mainly introduces the H5 canvas to implement the Snake game. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.
This article introduces the implementation of the Snake game on H5 canvas and shares it with everyone. The details are as follows:
The implementation effect is as follows
Implementation ideas:
ps: This is just an idea, please see the code comments for details
1. First draw the snake
Define the structure of the snake and use an array to save a bunch of rectangles, including the snake head (red) and the snake body (gray) ).
Drawing a snake (initial state)
2. The snake can move (key points)
Snake movement method: only the snake head is moving from beginning to end
Draw a gray square, the position overlaps with the snake head
Insert this block into the array at a position behind the snake head arrar.splice(0,1,rect)
Cut off the last block array.pop()
Move the snake head one space to the set direction
Requires a variable (direction) to save the direction
-
Move according to the direction, move one grid at a time
Change the direction according to the keys
3. Randomly place food
Need the location of random food
Need to determine whether the food is on the snake.
##4. Eat food
- Determine whether the food overlaps with the snake head
- Add an element to the array (removing one element means adding one element)
- Generate new food
5. gameover
- Judgment of hitting the wall
- Pretend to make your own judgment
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> #canvas{ box-shadow: 0 5px 40px black; } </style> </head> <body> <canvas id="canvas" width="800" height="500"></canvas> </body> <script> var canvas = document.getElementById('canvas'); var context = canvas.getContext('2d'); //构造对象方块 function Rect (x,y,w,h,color) { this.x = x; this.y = y; this.w = w; this.h = h; this.color = color; } //画方块的方法 Rect.prototype.draw = function () { context.beginPath(); context.fillStyle = this.color; context.rect(this.x,this.y,this.w,this.h); context.fill(); context.stroke(); } //构造对象蛇 function Snake () { //定义一个空数组存放组成整蛇的方块对象 var snakeArray = []; //画出4个方块,设置成灰色 for (var i = 0; i < 4; i++) { var rect = new Rect(i*20,0,20,20,"gray"); //之所以用splice(往前加)而不是用push(往后加),是为了让蛇头出现在数组第一个位置 snakeArray.splice(0,0,rect); } //把数组第一个作为蛇头,蛇头设成红色 var head = snakeArray[0]; head.color = "red"; //此处将两个后面常用的东西定为属性,方便后面调用 this.head = snakeArray[0]; //蛇头 this.snakeArray = snakeArray; //整蛇数组 //给定初始位置向右(同keyCode右箭头) this.direction = 39; } //画蛇的方法 Snake.prototype.draw = function () { for (var i = 0; i < this.snakeArray.length; i++) { this.snakeArray[i].draw(); } } //蛇移动的方法 Snake.prototype.move = function () { //此处是核心部分,蛇的 移动方式 //1、画一个灰色的方块,位置与蛇头重叠 //2、将这个方块插到数组中蛇头后面一个的位置 //3、砍去末尾的方块 //4、将蛇头向设定方向移动一格 var rect = new Rect(this.head.x,this.head.y,this.head.w,this.head.h,"gray"); this.snakeArray.splice(1,0,rect); //判断是否吃到食物,isEat判定函数写在最后了 //吃到则食物重新给位置,不砍去最后一节,即蛇变长 //没吃到则末尾砍掉一节,即蛇长度不变 if (isEat()){ food = new getRandomFood(); }else{ this.snakeArray.pop(); } //设置蛇头的运动方向,37 左,38 上,39 右,40 下 switch (this.direction) { case 37: this.head.x -= this.head.w break; case 38: this.head.y -= this.head.h break; case 39: this.head.x += this.head.w break; case 40: this.head.y += this.head.h break; default: break; } // gameover判定 // 撞墙 if (this.head.x > canvas.width || this.head.x < 0 || this.head.y > canvas.height || this.head.y < 0){ clearInterval(timer); } // 撞自己,循环从1开始,避开蛇头与蛇头比较的情况 for (var i = 1; i < this.snakeArray.length; i++) { if (this.snakeArray[i].x == this.head.x && this.snakeArray[i].y == this.head.y){ clearInterval(timer); } } } //画出初始的蛇 var snake = new Snake() snake.draw(); //画出初始的食物 var food = new getRandomFood() //定时器 var timer = setInterval(function () { context.clearRect(0,0,canvas.width,canvas.height); food.draw(); snake.move(); snake.draw(); }, 100) //键盘事件,其中的if判定是为了让蛇不能直接掉头 document.onkeydown = function (e) { var ev = e||window.event; switch(ev.keyCode){ case 37:{ if (snake.direction !== 39){ snake.direction = 37; } break; } case 38:{ if (snake.direction !== 40){ snake.direction = 38; } break; } case 39:{ if (snake.direction !== 37){ snake.direction = 39; } break; } case 40:{ if (snake.direction !== 38){ snake.direction = 40; } break; } } ev.preventDefault(); } //随机函数,获得[min,max]范围的值 function getNumberInRange (min,max) { var range = max-min; var r = Math.random(); return Math.round(r*range+min) } //构建食物对象 function getRandomFood () { //判定食物是否出现在蛇身上,如果是重合,则重新生成一遍 var isOnSnake = true; //设置食物出现的随机位置 while(isOnSnake){ //执行后先将判定条件设置为false,如果判定不重合,则不会再执行下列语句 isOnSnake = false; var indexX = getNumberInRange(0,canvas.width/20-1); var indexY = getNumberInRange(0,canvas.height/20-1); var rect = new Rect(indexX*20, indexY*20, 20, 20, "green"); for (var i = 0; i < snake.snakeArray.length; i++) { if(snake.snakeArray[i].x == rect.x && snake.snakeArray[i].y == rect.y){ //如果判定重合,将其设置为true,使随机数重给 isOnSnake = true; break; } } } //返回rect,使得实例化对象food有draw的方法 return rect; } //判定吃到食物,即蛇头坐标与食物坐标重合 function isEat () { if (snake.head.x == food.x && snake.head.y == food.y){ return true; } else { return false; } } </script> </html>
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