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贪吃蛇.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="app">
<div id="game"></div>
<button id="begin">开始</button>
<button id="pause">停止</button>
</div>
<script>
class GluttonousSnake {
#size
constructor (size) {
this.#size = size
;[this.head,this.tail,this.snakePosition] = this.createSnake()
this.applePOsition = this.createApple()
this.score = 0
this._headMoveto = 'right'
}
createSnake () {
let site = this.#size / 2 | 0
let head = [site + 1,site]
let body = [site,site]
let tail = [site - 1,site]
let snakeArr = [tail,body,head]
return [head,tail,snakeArr]
}
createApple () {
while(true){
let row = (Math.random() * this.#size | 0) - 1
let column = (Math.random() * this.#size | 0) - 1
if(!this.snakePosition.find(item => item[1] == row && item[0] == column )){
return [column,row]
}
}
}
move () {
let [hx,hy] = this.head
let newX,newY
if(this._headMoveto == 'right'){
[newX,newY] = [hx + 1,hy]
}else if(this._headMoveto == 'left'){
[newX,newY] = [hx - 1,hy]
}else if(this._headMoveto == 'up'){
[newX,newY] = [hx,hy - 1]
}else if(this._headMoveto == 'down'){
[newX,newY] = [hx,hy + 1]
}else{
throw new Error('unknown direction of head')
}
this.head = [newX,newY]
if(this.isOver()) return 'game over'
if(this.applePOsition[0] == newX && this.applePOsition[1] == newY){
this.score++
this.applePOsition = this.createApple()
this.snakePosition.push(this.head)
return
}
this.snakePosition.shift()
this.snakePosition.push(this.head)
this.tail = this.snakePosition[0]
}
setMoveto (direction) {
if(this._headMoveto == 'right' || this._headMoveto == 'left' ){
if(direction == 'up' || direction == 'down'){
this._headMoveto = direction
this.move()
}
}else{
if(direction == 'left' || direction == 'right'){ // 左
this._headMoveto = direction
this.move()
}
}
}
isOver () {
let x = this.head[0]
let y = this.head[1]
if(x < 0 || x >= this.size) return true
if(y < 0 || y >= this.size) return true
let length = this.snakePosition.length - 1
for(let i = 0;i < length;i++){
if(this.snakePosition[i][0] == x && this.snakePosition[i][1] == y) return true
}
return false
}
}
</script>
<script>
let game = document.querySelector('#game')
let begin = document.querySelector('#begin')
let pause = document.querySelector('#pause')
const canvas = document.createElement('canvas')
canvas.width = 600
canvas.height = 600
canvas.style.border = '1px solid'
game.append(canvas)
const ctx = canvas.getContext('2d')
let snake = new GluttonousSnake(canvas.width / 10)
let intervalId
let isRunning = false
begin.addEventListener('click', () => {
intervalId = setInterval(() => {redraw()}, 100)
isRunning = true
})
pause.addEventListener('click',() => {
if(intervalId) clearInterval(intervalId)
isRunning = false
})
document.body.addEventListener('keydown', (e) => {
if(!isRunning) return
debugger
if(e.keyCode == 37){
e.preventDefault()
clearInterval(intervalId)
snake.setMoveto('left')
intervalId = setInterval(() => {
redraw()
}, 100)
}
if(e.keyCode == 38){
e.preventDefault()
clearInterval(intervalId)
snake.setMoveto('up')
intervalId = setInterval(() => {
redraw()
}, 100)
}
if(e.keyCode == 39){
e.preventDefault()
clearInterval(intervalId)
snake.setMoveto('right')
intervalId = setInterval(() => {
redraw()
}, 100)
}
if(e.keyCode == 40){
e.preventDefault()
clearInterval(intervalId)
snake.setMoveto('down')
intervalId = setInterval(() => {
redraw()
}, 100)
}
})
function redraw () {
ctx.clearRect(0,0,canvas.width,canvas.height)
ctx.save
snake.move()
drawSnake()
ctx.restore()
}
drawSnake()
function drawSnake() {
let snakePosition = snake.snakePosition.map(item => item.map(it => it * 10))
let snakeHead = snakePosition.pop()
let applePOsition = snake.applePOsition.map(it => it * 10)
for(let i = 0;i < snakePosition.length;i++){
let rx = snakePosition[i][0] + 5
let ry = snakePosition[i][1] + 5
ctx.beginPath()
ctx.arc(rx,ry,5,0,2 * Math.PI)
ctx.fillStyle = 'green'
ctx.fill()
ctx.closePath()
}
let headX = snakeHead[0] + 5
let headY = snakeHead[1] + 5
ctx.beginPath()
ctx.arc(headX,headY,5,0,2 * Math.PI)
ctx.fillStyle = 'green'
ctx.fill()
ctx.closePath()
ctx.beginPath()
ctx.moveTo(headX,headY)
if(snake._headMoveto == 'right'){
ctx.arc(headX,headY,5,-0.2 * Math.PI,0.2 * Math.PI)
}else if(snake._headMoveto == 'left'){
ctx.arc(headX,headY,5,0.8 * Math.PI,1.2 * Math.PI)
}else if(snake._headMoveto == 'up'){
ctx.arc(headX,headY,5,-0.7 * Math.PI,-0.3 * Math.PI)
}else{
ctx.arc(headX,headY,5,0.3 * Math.PI,0.7 * Math.PI)
}
ctx.lineTo(headX,headY)
ctx.fillStyle = 'white'
ctx.fill()
ctx.closePath()
let appleX = applePOsition[0]
let appleY = applePOsition[1]
ctx.beginPath()
ctx.arc(appleX,appleY,5,0,2 * Math.PI)
ctx.fillStyle = 'red'
ctx.fill()
ctx.closePath()
}
</script>
</body>
</html>