柿霖不是林 发表于 2017-3-3 12:39:10

微信小程序demo：贪食蛇；Canvas绘制







var nodeWH = 10
var direction = 'right'
var timer = null
var nodes=[]
var food = null
var context = wx.createContext()
var lastPoint = null
var isGameOver = false
var that
var score = 0

function Node(x,y){
this.x = x;
this.y = y;
}

function createSnake(){
nodes.splice(0, nodes.length)
for (var i = 4; i >= 0; i--) {
    var node = new Node(nodeWH * (i + 0.5), nodeWH * 0.5)
    nodes.push(node);
}
}

function createFood(){
var x = parseInt(Math.random() * 24) * nodeWH + nodeWH * 0.5
var y = parseInt(Math.random() * 34) * nodeWH + nodeWH * 0.5

//如果食物的坐标在蛇身上，则重新创建
for (var i = 0; i < nodes.length; i++) {
    var node = nodes
    if (node.x == x && node.y == y) {
      createFood()
      return
    }
}
food = new Node(x,y)
}

//绘制蛇与食物
function draw(){
for (var i = 0; i < nodes.length; i++) {
    var node = nodes
    if (i == 0) {
      context.setFillStyle('#ff0000')
    } else {
      context.setFillStyle('#000000')
    }
    context.beginPath()
    context.rect(node.x, node.y, nodeWH, nodeWH)
    context.closePath()
    context.fill()
}

context.setFillStyle('#0000ff')
context.beginPath()
context.rect(food.x, food.y, nodeWH, nodeWH)
context.closePath()
context.fill()
   
wx.drawCanvas({
    canvasId: 'snakeCanvas',
    actions: context.getActions()
})
}

//游戏结束
function gameOver(){
isGameOver = true
clearInterval(timer)
wx.showModal({
    title:'Game Over',
    content:'总得分：'+ score +'，不服再来?',
    confirmText:'不服',
    success:function(e){
      if (e.confirm == true) {
      startGame()
      } else {
      console.log('cancel')
      that.setData({
          btnTitle:'开始'
      })
      }
    }
})
}

//是否吃到食物
function isEatedFood(){
var head = nodes
if (head.x == food.x && head.y == food.y) {
    score++
    nodes.push(lastPoint)
    createFood()
}
}

//是否撞到墙壁或者撞到自己的身体
function isDestroy(){
var head = nodes
for (var i = 1; i < nodes.length; i++) {
    var node = nodes
    if (head.x == node.x && head.y == node.y) {
      gameOver()
    }
}
if (head.x < 5 || head.x > 245) {
    gameOver()
}
if (head.y < 5 || head.y > 345) {
    gameOver()
}
}

function moveEnd(){
isEatedFood()
isDestroy()
draw()
}

function move(){
    lastPoint = nodes
    var node = nodes
    var newNode = {x: node.x, y: node.y}
    switch (direction) {
      case 'up':
      newNode.y -= nodeWH;
      break;
      case 'left':
      newNode.x -= nodeWH;
      break;
      case 'right':
      newNode.x += nodeWH;
      break;
      case 'down':
      newNode.y += nodeWH;
      break;
}
nodes.pop()
    nodes.unshift(newNode)
    moveEnd()
}

function startGame() {
if (isGameOver) {
    direction = 'right'
    createSnake()
    createFood()
    score = 0
    isGameOver = false
}
timer = setInterval(move,300)
}
   
Page({
data:{
    btnTitle:'开始'
},
onLoad:function(){
    that = this
    createSnake()
    createFood()
    draw()
},
changeDirection:function(e){
    if ('开始' == this.data.btnTitle) return
    var title = e.target.id
    if (title == 'down' || title == 'up') {
      if (direction == 'up' || direction == 'down') return
    } else if (direction == 'left' || direction == 'right') return
    direction = title;
},
startGame:function() {
    var title = this.data.btnTitle
    if (title == '暂停') {
      clearInterval(timer)
      this.setData({
      btnTitle : '开始'
      })
    } else {
      startGame()
      this.setData({
      btnTitle : '暂停'
      })
    }
}
})


**** Hidden Message *****

jack56846 发表于 2020-4-24 14:24:27

我有流量，你有产品，我们就可以合作，有意的个人开发者朋友可以联系微,信,号j i m 2 0 1 8 0 6 8 8，详聊
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