简介

自从，上次完成了一个推箱子的简易版本，自然想实现一个牛掰一点的可以实现多个关卡的推箱子小游戏：


实现思路

1、我们首先使用对象保存每个对象的信息：

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//level表示关卡
//state为地图，其中0表示无，1表示隔离，2表示空地，3表示目标，4表示箱子，5表示当前位置
//person代表当前位置
//box代表目标位置

const level = [
    {
        state:[
            [0,0,0,1,1,1,1,1,1,0],
            [0,1,1,1,2,2,2,2,1,0],
            [1,1,3,2,4,1,1,2,1,1],
            [1,3,3,4,2,4,2,2,5,1],
            [1,3,3,2,4,2,4,2,1,1],
            [1,1,1,1,1,1,2,2,1,0],
            [0,0,0,0,0,1,1,1,1,0]
        ],
        person:{x:8,y:3},
        box: [{x:1,y:3},{x:1,y:4},{x:2,y:2},{x:2,y:3},{x:2,y:4}]
    },
    {
        state:[
            [0,1,1,1,1,1,0,0],
            [0,1,2,2,1,1,1,0],
            [0,1,5,4,2,2,1,0],
            [1,1,1,2,1,2,1,1],
            [1,3,1,2,1,2,2,1],
            [1,3,4,2,2,1,2,1],
            [1,3,2,2,2,4,2,1],
            [1,1,1,1,1,1,1,1]
        ],
        person: {x : 2, y : 2},
        box: [{x:1, y : 4}, {x:1,y:5} ,{x:1, y:6}]
    }
]

2、对每个关卡新建一个sokoban对象, 这个sokoban对象如何实现推箱子的基本逻辑可以看我的上一篇。

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chapterFirst.onclick = () => {
    levelNum = 0;
    const sokoban = new Sokoban(levelNum,ctx,canvas.width,canvas.height);
    sokoban.init();

    reset.onclick = () => {
        sokoban.reset(level,levelNum);
    }
}
chapterSecond.onclick = () => {
    levelNum = 1;
    const sokoban = new Sokoban(levelNum,ctx,canvas.width,canvas.height);
    sokoban.init();

    reset.onclick = () => {
        sokoban.reset(level,levelNum);
    }
}

3、从关卡返回首页，可以重新选择关卡

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let backImg = new Image();
backImg.src = 'images/back.png';

const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');

function home(){
    if (backImg.complete) {
        showHome()
    }else {
        showHome()
    }
}

function showHome() {
    ctx.clearRect(0,0,canvas.width,canvas.height);
    ctx.drawImage(backImg,0,0,canvas.width,canvas.height);
    ctx.font = "60px STCaiyun";
    ctx.textAlign = 'center'; 
    ctx.strokeStyle = '#DD6C0A';
    ctx.lineWidth = 2;
    ctx.strokeText('选择关卡',400,70);

    chapter.style.display = 'block';
    reset.style.display = "none";
}

遇到的问题

重置地图这里我遇到了一个新的问题！

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reset(level,levelNumber) {
    const temp = level[levelNumber];
    this.myMap = temp.state;
    this.curLoc = temp.person;
    this.init();
}

这样是不能重置地图的！
因为js中我们的数组对象是引用类型，b = [1,2], a=b 在我们修改a中的元素后，b实际上已经改变了！

再举一个小小的例子：

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var a=[{state:1}, {state:3}];
var b=a.slice(0);
b[0].state= 3;
a[0].state //3

使用slice是可以复制一个新的数组，但是我们的a内容里面都是对象（引用类型），所以仍然无用。

可以使用：

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JSON.parse(JSON.stringify(object))

完整实现

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<!DOCTYPE html>
<html>
    <header>
        <meta charset="utf-8">
        <title>新推箱子</title>
        <link rel="stylesheet" type="text/css" href="push.css">
    </header>
    <body>
        <div class="background">
            <div class="control">
                <span id="returnHome"><<返回</span>
                <span id="reset">重置</span>
                <!-- <span>下一关</span> -->
            </div>
            <div class="chapterF">
                <canvas id="myCanvas" width="800px" height="600px"></canvas>
                <div class="chapter">
                    <button class="chapterItem" data="0">
                        第一关
                    </button>
                    <button class="chapterItem" data='1'>
                        第二关
                    </button>
                </div>
            </div>
          
        </div>
    </body>
    <script src="save.js"></script>
</html>
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const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');
const returnHome = document.getElementById('returnHome');
const reset = document.getElementById('reset');
const chapterFirst = document.getElementsByTagName('button')[0];
const chapterSecond = document.getElementsByTagName('button')[1];
const chapter = document.getElementsByClassName('chapter')[0];

let levelNum = 0;

let backImg = new Image();
backImg.src = 'images/back.png';

chapterFirst.onclick = () => {
    levelNum = 0;
    reset.style.display = 'block';
    chapter.style.display = 'none';
    const sokoban = new Sokoban(levelNum,ctx,canvas.width,canvas.height);
    sokoban.init();

    reset.onclick = () => {
        sokoban.reset(level,levelNum);
    }
}
chapterSecond.onclick = () => {
    levelNum = 1;
    reset.style.display = 'block';
    chapter.style.display = 'none';
    const sokoban = new Sokoban(levelNum,ctx,canvas.width,canvas.height);
    sokoban.init();

    reset.onclick = () => {
        sokoban.reset(level,levelNum);
    }
}
//level表示关卡
//state为地图，其中0表示无，1表示隔离，2表示空地，3表示目标，4表示箱子，5表示当前位置
//person代表当前位置
//box代表目标位置

const level = [
    {
        state:[
            [0,0,0,1,1,1,1,1,1,0],
            [0,1,1,1,2,2,2,2,1,0],
            [1,1,3,2,4,1,1,2,1,1],
            [1,3,3,4,2,4,2,2,5,1],
            [1,3,3,2,4,2,4,2,1,1],
            [1,1,1,1,1,1,2,2,1,0],
            [0,0,0,0,0,1,1,1,1,0]
        ],
        person:{x:8,y:3},
        box: [{x:1,y:3},{x:1,y:4},{x:2,y:2},{x:2,y:3},{x:2,y:4}]
    },
    {
        state:[
            [0,1,1,1,1,1,0,0],
            [0,1,2,2,1,1,1,0],
            [0,1,5,4,2,2,1,0],
            [1,1,1,2,1,2,1,1],
            [1,3,1,2,1,2,2,1],
            [1,3,4,2,2,1,2,1],
            [1,3,2,2,2,4,2,1],
            [1,1,1,1,1,1,1,1]
        ],
        person: {x : 2, y : 2},
        box: [{x:1, y : 4}, {x:1,y:5} ,{x:1, y:6}]
    }
]

let Sokoban = function(levelNumber,ctx,width,height){
    const temp = JSON.parse(JSON.stringify(level[levelNumber]));
    this.myMap = temp.state;
    this.curLoc = temp.person;
    this.targetLoc = temp.box;
    this.height = height;
    this.width = width;
    this.ctx = ctx;
    this.imageArray = [new Image(),new Image(),new Image(),new Image(),new Image(),new Image()];
}

Sokoban.prototype = {
    init() {
        //准备好照片后自动生成地图
        this.prepareImage();
        window.onkeydown = (e) => {
            let keyNum = window.event?e.keyCode:e.which;
            e.preventDefault();
            this.action(keyNum);
        }
    },
    prepareImage() {
        const imgSrcArray = ['images/1.png','images/2.png','images/3.png','images/4.png','images/8.png','images/tree.png'];
        var imgLength = this.imageArray.length;
        this.imageArray.forEach((current,index) => {
            current.src = imgSrcArray[index];
            //判断图片是否加载完成
            if (current.complete) {
                if(index == imgLength-1) 
                this.fillCell();
            } else {
                current.onload = () => {
                    if(index == imgLength-1) this.fillCell();
                }
            }
        }) 
    },
    fillCell() {
        const cellWidth = ~~(this.width/this.myMap[0].length +1);
        const cellHeight = ~~(this.height/this.myMap.length +1);
        // console.log('单个元素的宽为：' + cellWidth+',高为：'+cellHeight);
        let mapType = null;
        let ptn = null;
        //i为第几行，j为第几列
        for(let i = 0 ; i < this.myMap.length ; i++){
            for(let j = 0 ; j < this.myMap[i].length ; j++){
                mapType = this.myMap[i][j];
                // console.log(mapType);
                switch(mapType){
                    case 0: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.fillStyle = '#333';
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.drawImage(this.imageArray[5],j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    case 1: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            ptn = this.ctx.createPattern(this.imageArray[0],'repeat');
                            this.ctx.shadowBlur=5;
                            this.ctx.shadowColor="black";
                            this.ctx.fillStyle = ptn;
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    case 2: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            ptn = this.ctx.createPattern(this.imageArray[1],'repeat');
                            this.ctx.fillStyle = ptn;
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    case 3: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            ptn = this.ctx.createPattern(this.imageArray[1],'repeat');
                            this.ctx.fillStyle = ptn;
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.drawImage(this.imageArray[2],j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    case 4: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            ptn = this.ctx.createPattern(this.imageArray[1],'repeat');
                            this.ctx.fillStyle = ptn;
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.drawImage(this.imageArray[3],j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    case 5: this.ctx.save();
                            this.ctx.clearRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            ptn = this.ctx.createPattern(this.imageArray[1],'repeat');
                            this.ctx.fillStyle = ptn;
                            this.ctx.fillRect(j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.drawImage(this.imageArray[4],j*cellWidth,i*cellHeight,cellWidth,cellHeight);
                            this.ctx.restore();
                            break;
                    default:break;
                }
            }
        }
    },
    action(keyNum) {
        let nextLoc = {};
        let nextTwoStepLoc = {};
        switch (keyNum) {
            case 37:  nextLoc.x = this.curLoc.x-1;
                        nextLoc.y = this.curLoc.y;
                        nextLoc.mapType = this.myMap[nextLoc.y][nextLoc.x];
                        //下下一步
                        nextTwoStepLoc.x = this.curLoc.x-2;
                        nextTwoStepLoc.y = this.curLoc.y;
                        nextTwoStepLoc.mapType = this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x];
                        //空地和目的地都可以随便走
                        if (nextLoc.mapType == 2 || nextLoc.mapType == 3) {
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }else if (nextLoc.mapType == 4 && (nextTwoStepLoc.mapType == 2 || nextTwoStepLoc.mapType == 3)) {
                            // console.log('有障碍');
                            this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x] = 4;
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }
                        this.check();
                        break;
            case 38:  nextLoc.x = this.curLoc.x;
                        nextLoc.y = this.curLoc.y-1;
                        nextLoc.mapType = this.myMap[nextLoc.y][nextLoc.x];
                        //下下一步
                        nextTwoStepLoc.x = this.curLoc.x;
                        nextTwoStepLoc.y = this.curLoc.y-2;
                        nextTwoStepLoc.mapType = this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x];
                        if (nextLoc.mapType == 2 || nextLoc.mapType == 3) {
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }else if (nextLoc.mapType == 4 && (nextTwoStepLoc.mapType == 2 || nextTwoStepLoc.mapType == 3)) {
                            // console.log('有障碍');
                            this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x] = 4;
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }
                        this.check();
                        break;
            case 39:  nextLoc.x = this.curLoc.x+1;
                        nextLoc.y = this.curLoc.y;
                        nextLoc.mapType = this.myMap[nextLoc.y][nextLoc.x];
                        //下下一步
                        nextTwoStepLoc.x = this.curLoc.x+2;
                        nextTwoStepLoc.y = this.curLoc.y;
                        nextTwoStepLoc.mapType = this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x];
                        if (nextLoc.mapType == 2 || nextLoc.mapType == 3) {
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }else if (nextLoc.mapType == 4 && (nextTwoStepLoc.mapType == 2 || nextTwoStepLoc.mapType == 3)) {
                            // console.log('有障碍');
                            this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x] = 4;
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }
                        this.check();
                        break;
            case 40:  nextLoc.x = this.curLoc.x;
                        nextLoc.y = this.curLoc.y+1;
                        nextLoc.mapType = this.myMap[nextLoc.y][nextLoc.x];
                        //下下一步
                        nextTwoStepLoc.x = this.curLoc.x;
                        nextTwoStepLoc.y = this.curLoc.y+2;
                        nextTwoStepLoc.mapType = this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x];
                        if (nextLoc.mapType == 2 || nextLoc.mapType == 3) {
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }else if (nextLoc.mapType == 4 && (nextTwoStepLoc.mapType == 2 || nextTwoStepLoc.mapType == 3)) {
                            // console.log('有障碍');
                            this.myMap[nextTwoStepLoc.y][nextTwoStepLoc.x] = 4;
                            this.changeLoc(nextLoc);
                            this.fillCell();
                        }
                        this.check();
                        break;
            default:  break;
        }
    },
    changeLoc(nextLoc) {
        this.myMap[nextLoc.y][nextLoc.x] = 5;
        this.myMap[this.curLoc.y][this.curLoc.x] = 2;
        //判断是否踩在目标点上
        for(let i = this.targetLoc.length-1 ; i >= 0 ; i--){
            if(this.curLoc.x == this.targetLoc[i].x && this.curLoc.y == this.targetLoc[i].y) {
                this.myMap[this.curLoc.y][this.curLoc.x] = 3;
            }
        }
        this.curLoc.x = nextLoc.x;
        this.curLoc.y = nextLoc.y;
    },
    check(){
        let count = 0;
        let tot = this.targetLoc.length;
        for(let i = this.targetLoc.length-1 ; i >= 0 ; i--){
            if(this.myMap[this.targetLoc[i].y][this.targetLoc[i].x] == 4) {
                count++;
            }
        }
        
        if(count == tot) {
            ctx.font = "60px STCaiyun";
            ctx.textAlign = 'center'; 
            ctx.strokeStyle = '#FFFFFF';
            ctx.lineWidth = 2;
            ctx.strokeText('闯关成功！',400,70);
        };
    },
    reset(level,levelNumber) {
        const temp = JSON.parse(JSON.stringify(level[levelNumber]));
        this.myMap = temp.state;
        this.curLoc = temp.person;
        this.init();
    }
}
function home(){
    if (backImg.complete) {
        ctx.clearRect(0,0,canvas.width,canvas.height);
        ctx.drawImage(backImg,0,0,canvas.width,canvas.height);
        ctx.font = "60px STCaiyun";
        ctx.textAlign = 'center'; 
        ctx.strokeStyle = '#DD6C0A';
        ctx.lineWidth = 2;
        ctx.strokeText('选择关卡',400,70);

        chapter.style.display = 'block';
        reset.style.display = "none";
    }else {
        backImg.onload = () => {
            ctx.clearRect(0,0,canvas.width,canvas.height);
            ctx.drawImage(backImg,0,0,canvas.width,canvas.height);
            ctx.font = "60px STCaiyun";
            ctx.textAlign = 'center'; 
            ctx.strokeStyle = '#DD6C0A';
            ctx.lineWidth = 2;
            ctx.strokeText('选择关卡',400,70);

            chapter.style.display = 'block';
            reset.style.display = "none";
        }
    }
}


home();

returnHome.onclick = () => {
    home();
}

canvas.onclick = (e) => {
    console.log('pageX:'+e.pageX);
    console.log('layerX:'+e.layerX);
    console.log('offsetX:'+e.offsetX);
    console.log('clientX:'+e.clientX);
    console.log(e.target.offsetLeft);
}
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/*$width: 800px;
$height: 600px;*/ 
body{
    /*text-align: center;*/
}

.background{
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: radial-gradient(#F4A5E8,#F0CCCC,#F9EDF7);
}
svg{
  display: block;
  position: absolute;
  width: 590px;
  height: 200px;
  top: 80px;
  left: 50%;
  transform: translate(-50%,-50%);
  overflow: hidden;
  background-size: cover;
 }

 .filtered{
   filter: url(#filter);
   color: #0777C7;
   fill: #073B40;
   font-family: 'Oleo Script', cursive;
   font-size: 120px;
}

.control {
    width: 800px;
    height: 60px;
    margin: 160px auto 0 auto;

    background: -webkit-linear-gradient(left,red, blue); /* Safari 5.1 - 6.0 */
    background: -o-linear-gradient(right,red, blue); /* Opera 11.1 - 12.0 */
    background: -moz-linear-gradient(right,red, blue); /* Firefox 3.6 - 15 */
    background: linear-gradient(to right,#E18E0E,#F6E97E);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    
}
.control span{
    font-size:24px;
    width: 100px;
    color: white;
    align-items: center;
    text-align: center;
    margin:10px;
    cursor:pointer;
}

.control span:hover{
    color: #DED5D5;
}

#reset{
    display:none; 
}
.chapterF {
    position: relative;
    margin: auto;
    width: 800px;
}
#myCanvas {
    margin: 0 auto;
}

.chapter {
    position: absolute;
    top: 250px;
    left: 270px;
    /*display: none;*/
}

.chapterItem{
    margin: 10px;
    background-color: #C97D07; /* Green */
    border: none;
    border-radius: 4px;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.5s;
}
.chapterItem:hover{
    background-color: #E18E0E;
}