vue+canvas实现拼图小游戏

randomHandler() {
 // pic的初始化
 for(let i=0;i<this.rowthis.column;i++) {
 // 设置切割后每个小图片的位置
 let row = parseInt(i/this.row);
 let column = i - rowthis.column;
 // 对在canvas的排列进行初始化，后续不会进行改变
 let x = parseInt(i/this.row);
 let y = i - xthis.column;
 this.pic[i] = {...this.pic[i],x:x,y:y,row:row,column:column,index:i};
 // 设置一个元素为空白块，index = -1
 if(i == (this.rowthis.column-1)) {
  this.pic[i] = {...this.pic[i],row:row,column:column,index:-1};
 }
 }
 // 随机排列 pic集合
 for(let i=0;i<this.num;i++) {
 let ran1,ran2,temp={};
 // 随机获取0-14
 ran1 = parseInt((this.rowthis.column-1)Math.random())
 ran2 = parseInt((this.rowthis.column-1)Math.random())
 temp.row = this.pic[ran1].row
 temp.column = this.pic[ran1].column
 this.pic[ran1] = {...this.pic[ran1],row:this.pic[ran2].row,column:this.pic[ran2].column}
 this.pic[ran2] = {...this.pic[ran2],...temp}
 }
}

drawHandler() {
 // 获取 canvas DOM元素
 let canvas = this.$refs.can;
 let ctx = canvas.getContext('2d');
 canvas.width = 400;
 canvas.height = 400;
 ctx.clearRect(0,0,400,400);
 // 每个小拼图的宽高，根据canvas的宽高和拼图行数row列数column来动态设置
 // 是进行难度动态设置的唯一方式
 let width = canvas.width/this.column;
 let height = canvas.width/this.row;
 // 必须通过 Image 构造函数动态创建，若是通过获取 DOM 节点，则onload只执行一次，无法进行移动
 let img = new Image();
 img.src = require('../../public/image/test.png');
 img.onload = () => {
 for(let i=0;i<this.rowthis.column;i++) {
  // 绘制到canvas的各元素的起始坐标
  let dx = this.pic[i].y  width;
  let dy = this.pic[i].x  height;
  // 对图片进行切割的起始点坐标
  let cx = this.pic[i].column  width;
  let cy = this.pic[i].row  height;
  // 参数img图片，切割的起始点坐标，切割的宽高，绘制的起始点坐标，绘制的宽高
  ctx.drawImage(img,cx,cy,width,height,dx,dy,width,height);
  if(this.pic[i].index == -1) {
  this.sign = i;
  ctx.clearRect(dx,dy,width,height);
  }
 }
 }
}

// 在 mounted 钩子进行键盘的监听事件
mounted() {
 this.newGame();
 document.onkeydown = (event) => {
 let key = event.keyCode;
 if(key==38 || key==87) this.moveHandler('up');
 else if (key==40 || key==83 ) this.moveHandler('down');
 else if (key==37 || key==65 ) this.moveHandler('left');
 else if (key==39 || key==68 ) this.moveHandler('right');
 }
 }
methods: {
 moveHandler(dir) {
 // re:空白块根据方向最终需移动到的位置索引
 let re,temp = {};
 if(dir == 'up' && this.pic[this.sign].x>0) {
 // 根据空白块的row和column推算出上面一块图片的序号
 // 在将两个图片快进行互换位置，及交换row、column、index
 // 重新赋值this.sign（标志着空白块的序号默认15）
 re = (this.pic[this.sign].x-1)  this.row + this.pic[this.sign].y;
 temp.row = this.pic[re].row;
 temp.column = this.pic[re].column;
 temp.index = this.pic[re].index;
 this.pic[re] = {...this.pic[re],row:this.pic[this.sign].row,column:this.pic[this.sign].column,index:this.pic[this.sign].index};
 this.pic[this.sign] = {...this.pic[this.sign],...temp};
 this.step = this.step + 1;
 }
 else if(dir == 'down' && this.pic[this.sign].x<this.row-1) {
 re = (this.pic[this.sign].x+1)  this.row + this.pic[this.sign].y;
 temp.row = this.pic[re].row;
 temp.column = this.pic[re].column;
 temp.index = this.pic[re].index;
 this.pic[re] = {...this.pic[re],row:this.pic[this.sign].row,column:this.pic[this.sign].column,index:this.pic[this.sign].index};
 this.pic[this.sign] = {...this.pic[this.sign],...temp};
 this.step = this.step + 1;
 }
 else if(dir == 'left' && this.pic[this.sign].y>0) {
 re = (this.pic[this.sign].x)  this.row + this.pic[this.sign].y-1;
 temp.row = this.pic[re].row;
 temp.column = this.pic[re].column;
 temp.index = this.pic[re].index;
 this.pic[re] = {...this.pic[re],row:this.pic[this.sign].row,column:this.pic[this.sign].column,index:this.pic[this.sign].index};
 this.pic[this.sign] = {...this.pic[this.sign],...temp};
 this.step = this.step + 1;
 }
 else if(dir == 'right' && this.pic[this.sign].y<this.column-1) {
 re = (this.pic[this.sign].x)  this.row + this.pic[this.sign].y+1;
 temp.row = this.pic[re].row;
 temp.column = this.pic[re].column;
 temp.index = this.pic[re].index;
 this.pic[re] = {...this.pic[re],row:this.pic[this.sign].row,column:this.pic[this.sign].column,index:this.pic[this.sign].index};
 this.pic[this.sign] = {...this.pic[this.sign],...temp};
 this.step = this.step + 1;
 }
 // 重新绘制拼图，也可以通过计算只重新绘制移动的部分区域
 this.drawHandler();
 }
}

isWinHandler() {
 // 通过比较所有元素的x、y和row、column是否相等即可，也可以通过index来判断
 for(let i=0;i<this.rowthis.column;i++) {
 if(this.pic[i].x == this.pic[i].row && this.pic[i].y == this.pic[i].column) {
  // 显示成功的状态以及清空步数
  this.isWin = true;
  this.step = 0;
 }
 }
}

newGame() {
 // 在 mounted 钩子进行
 // 隐藏完成状态，清空步数，获取随机排列，绘制拼图模块
 this.isWin = false;
 this.step = 0;
 this.randomHandler();
 this.drawHandler();
 }

<script>
export default {
 data() {
 return {
 // row:拼图的总行数，column:拼图的总列数
 row:2,
 column:2,
 // 随机打乱的次数
 num:100,
 // pic:拼图的所有子集和；
 // 元素index子图片的位置编号
 // row/column:对原图分割后的横纵编号
 // x/y:在canvas中的坐标位置（不会改变）
 pic:[{x:0,y:0,row:0,column:0,index:0}],
 sign:15,
 isWin: false,
 step:0,
 maskShow:false
 }
 },
 mounted() { 代码在拼图移动模块中 },
 methods: {
 // 判断是否完成拼图
 isWinHandler() { ... },
 // 移动的函数方法
 moveHandler(dir) { ... },
 // 绘制拼图
 drawHandler() { ... },
 // 获取随机排序
 randomHandler() { ... },
 newGame() { ... }
}
</script>

<template>
 <div class="index">
 <div class="contain">
 <canvas class="can" ref="can"></canvas>
 <!-- 完成拼图的状态显示 -->
 <div v-if="isWin" class="win">游戏胜利！</div>
 <div class="btns">
 <span @click="newGame">重新游戏</span>
 <span @click="maskShow = true">编辑游戏</span>
 <span @click="isWinHandler">检验</span>
 <span>{{step}}</span>
 </div>
 <!-- 点击编辑游戏的弹出框 -->
 <div v-show="maskShow" class="mask">
 行<input type="text" v-model="row" placeholder="请输入行数">
 列<input type="text" v-model="column" placeholder="请输入列数">
 <button @click="maskShow = false">完成</button>
 </div>
 </div>
 <img ref="img" class="img" src="../../public/image/test.png" alt="error">
 </div>
</template>

<style scoped>
/ 编辑的弹出框 /
.mask {
 width: 200px;
 height: 200px;
 background-color: rosybrown;
 position: absolute;
 left: 510px;
 : 0;
}
/ 按钮样式 /
.btns > span {
 display: inline-block;
 width: 80px;
 font-size: 12px;
 height: 24px;
 text-align: center;
 line-height: 24px;
 margin-bottom: 5px;
 background-color: thistle;
 cursor: pointer;
}
/ 右侧按钮区 /
.btns {
 width: 80px;
 height: 400px;
 border: 1px solid tan;
 border-radius: 5px;
 background-origin: border-box;
 padding: 5px;
 position: absolute;
 left: 412px;
 : 0;
}
/ 完成拼图的状态 /
.win {
 width: 402px;
 height: 402px;
 line-height: 402px;
 text-align: center;
 font: 24px;
 opacity: 0.5;
 background-color: paleturquoise;
 position: absolute;
 : 0;
 left: 0;
}
.img {
 display: inline-block;
}
/ canvas /
.can {
 border: 1px solid teal;
}
/ canvas容器 /
.contain {
 position: relative;
}
</style>