Canvas悟空推箱子
“学如逆水行舟，不进则退”，工作之余我总会浏览一些先进前端知识以增强自己的知识储备，偶尔也会试着开发或模仿小游戏、程序、app 。昨天在 站长之家 发现了这个游戏，触动很大，先是玩了一晚上，只过了13关，今天把注释写上了，截取了前40关分享给大家，希望大家在玩耍之余能抽出时间学习或了解前端，前端是门手艺，它会像筷子一样离不开人们的生活。
个人能力有限，只能解答博友们一些浅显的问题，甚至不如百度百科及时、准确，如今前端就业形式一片大好，在一线城市薪资过万，优秀的前端工程师只需要5年，就可以解决住房问题，让父母老有所依。希望忙碌的你可以抽出时间多陪伴一下家人，家是自己唯一的港湾，承载着你所有的眷恋。
<!doctype html>
<html lang="en">
<head>
<meta charset="GB2312">
<title>HTML5 canvas小人推箱子小游戏</title>
<style> *{ margin:0px; padding:0px; } body{ overflow:hidden; } .game{ position: relative; width:560px; margin:20px auto; } .game #msg{ position: absolute;top:0; font:18px/1 华文楷体,华文琥珀; } .game #btn{ position: absolute;right:0;bottom:4px; } </style>
</head>
<body onkeydown="doKeyDown(event)">
<div class="game">
<canvas id="canvas" width="560" height="560"></canvas>
<div id="msg"></div>
<div id="btn">
<input type="button" value="上一关" onClick="NextLevel(-1)">
<input type="button" value="下一关" onClick="NextLevel(1)">
<input type="button" value="重玩本关" onClick="NextLevel(0)">
<input type="button" value="游戏说明" onClick="showHelp()">
</div>
</div>
</body>
<script> var can = document.getElementById("canvas"); var msg = document.getElementById("msg"); var cxt = can.getContext("2d"); var w = 35,h = 35; var curMap;//当前的地图 var curLevel;//当前等级的地图 var curMan;//初始化小人 var iCurlevel = 0;//关卡数 var moveTimes = 0;//移动了多少次 //预加载所有图片 var oImgs = { "block" : "https://img-blog.csdnimg.cn/20200907200323829.gif#pic_center", "wall" : "https://img-blog.csdnimg.cn/20200907200352103.png#pic_center", "box" : "https://img-blog.csdnimg.cn/20200907200329709.png#pic_center", "ball" : "https://img-blog.csdnimg.cn/20200907200309333.png#pic_center", "up" : "https://img-blog.csdnimg.cn/20200907200348854.png#pic_center", "down" : "https://img-blog.csdnimg.cn/20200907200334961.png#pic_center", "left" : "https://img-blog.csdnimg.cn/20200907200340792.png#pic_center", "right" : "https://img-blog.csdnimg.cn/20200907200344452.png#pic_center", } function imgPreload(srcs,callback){ var count = 0,imgNum = 0,images = {}; for(src in srcs){ imgNum++; } for(src in srcs ){ images[src] = new Image(); images[src].onload = function(){ //判断是否所有的图片都预加载完成 if (++count >= imgNum) { callback(images); } } images[src].src = srcs[src]; } } var block,wall,box,ball,up,down,left,right; imgPreload(oImgs,function(images){ //console.log(images.block); block = images.block; wall = images.wall; box = images.box; ball = images.ball; up = images.up; down = images.down; left = images.left; right = images.right; init(); }); //初始化游戏 function init(){ //InitMap(); //DrawMap(levels[0]); initLevel();//初始化对应等级的游戏 showMoveInfo();//初始化对应等级的游戏数据 } //绘制地板 function InitMap(){ for (var i=0;i<16 ;i++ ) { for (var j=0;j<16 ;j++ ) { cxt.drawImage(block,w*j,h*i,w,h); } } } //小人位置坐标 function Point(x,y){ this.x = x; this.y = y; } var perPosition = new Point(5,5);//小人的初始标值 //绘制每个游戏关卡地图 function DrawMap(level){ for (var i=0;i<level.length ;i++ ) { for (var j=0;j<level[i].length ;j++ ) { var pic = block;//初始图片 switch (level[i][j]) { case 1://绘制墙壁 pic = wall; break; case 2://绘制陷进 pic = ball; break; case 3://绘制箱子 pic = box; break; case 4://绘制小人 pic = curMan;//小人有四个方向 具体显示哪个图片需要和上下左右方位值关联 //获取小人的坐标位置 perPosition.x = i; perPosition.y = j; break; case 5://绘制箱子及陷进位置 pic = box; break; } //每个图片不一样宽 需要在对应地板的中心绘制地图 cxt.drawImage(pic,w*j-(pic.width-w)/2,h*i-(pic.height-h),pic.width,pic.height) } } } //初始化游戏等级 function initLevel(){ curMap = copyArray(levels[iCurlevel]);//当前移动过的游戏地图 curLevel = levels[iCurlevel];//当前等级的初始地图 curMan = down;//初始化小人 InitMap();//初始化地板 DrawMap(curMap);//绘制出当前等级的地图 } //下一关 function NextLevel(i){ //iCurlevel当前的地图关数 iCurlevel = iCurlevel + i; if (iCurlevel<0) { iCurlevel = 0; return; } var len = levels.length; if (iCurlevel > len-1) { iCurlevel = len-1; } initLevel();//初始当前等级关卡 moveTimes = 0;//游戏关卡移动步数清零 showMoveInfo();//初始化当前关卡数据 } //小人移动 function go(dir){ var p1,p2; switch (dir) { case "up": curMan = up; //获取小人前面的两个坐标位置来进行判断小人是否能够移动 p1 = new Point(perPosition.x-1,perPosition.y); p2 = new Point(perPosition.x-2,perPosition.y); break; case "down": curMan = down; p1 = new Point(perPosition.x+1,perPosition.y); p2 = new Point(perPosition.x+2,perPosition.y); break; case "left": curMan = left; p1 = new Point(perPosition.x,perPosition.y-1); p2 = new Point(perPosition.x,perPosition.y-2); break; case "right": curMan = right; p1 = new Point(perPosition.x,perPosition.y+1); p2 = new Point(perPosition.x,perPosition.y+2); break; } //若果小人能够移动的话，更新游戏数据，并重绘地图 if (Trygo(p1,p2)) { moveTimes ++; showMoveInfo(); } //重绘地板 InitMap(); //重绘当前更新了数据的地图 DrawMap(curMap); //若果移动完成了进入下一关 if (checkFinish()) { alert("恭喜过关！"); NextLevel(1); } } //判断是否推成功 function checkFinish(){ for (var i=0;i<curMap.length ;i++ ) { for (var j=0;j<curMap[i].length ;j++ ) { //当前移动过的地图和初始地图进行比较，若果初始地图上的陷进参数在移动之后不是箱子的话就指代没推成功 if (curLevel[i][j] == 2 && curMap[i][j] != 3 || curLevel[i][j] == 5 && curMap[i][j] != 3) { return false; } } } return true; } //判断小人是否能够移动 function Trygo(p1,p2){ if(p1.x<0) return false;//若果超出地图的上边，不通过 if(p1.y<0) return false;//若果超出地图的左边，不通过 if(p1.x>curMap.length) return false;//若果超出地图的下边，不通过 if(p1.y>curMap[0].length) return false;//若果超出地图的右边，不通过 if(curMap[p1.x][p1.y]==1) return false;//若果前面是墙，不通过 if (curMap[p1.x][p1.y]==3 || curMap[p1.x][p1.y]==5) {//若果小人前面是箱子那就还需要判断箱子前面有没有障碍物(箱子/墙) if (curMap[p2.x][p2.y]==1 || curMap[p2.x][p2.y]==3) { return false; } //若果判断不成功小人前面的箱子前进一步 curMap[p2.x][p2.y] = 3;//更改地图对应坐标点的值 //console.log(curMap[p2.x][p2.y]); } //若果都没判断成功小人前进一步 curMap[p1.x][p1.y] = 4;//更改地图对应坐标点的值 //若果小人前进了一步，小人原来的位置如何显示 var v = curLevel[perPosition.x][perPosition.y]; if (v!=2)//若果刚开始小人位置不是陷进的话 { if (v==5)//可能是5 既有箱子又陷进 { v=2;//若果小人本身就在陷进里面的话移开之后还是显示陷进 }else{ v=0;//小人移开之后之前小人的位置改为地板 } } //重置小人位置的地图参数 curMap[perPosition.x][perPosition.y] = v; //若果判断小人前进了一步，更新坐标值 perPosition = p1; //若果小动了 返回true 指代能够移动小人 return true; } //判断是否推成功 //与键盘上的上下左右键关联 function doKeyDown(event){ switch (event.keyCode) { case 37://左键头 go("left"); break; case 38://上键头 go("up"); break; case 39://右箭头 go("right"); break; case 40://下箭头 go("down"); break; } } //完善关卡数据及游戏说明 function showMoveInfo(){ msg.innerHTML = "第" + (iCurlevel+1) +"关 移动次数: "+ moveTimes; } //游戏说明 var showhelp = false; function showHelp(){ showhelp = !showhelp; if (showhelp) { msg.innerHTML = "用键盘上的上、下、左、右键移动小人，把箱子全部推到小球的位置即可过关。箱子只可向前推，不能往后拉，并且小人一次只能推动一个箱子。"; }else{ showMoveInfo(); } } //克隆二维数组 function copyArray(arr){ var b=[];//每次移动更新地图数据都先清空再添加新的地图 for (var i=0;i<arr.length ;i++ ) { b[i] = arr[i].concat();//链接两个数组 } return b; } //地图，可修改 var levels=[]; levels[0]=[ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0], [0,0,0,0,0,0,1,2,1,0,0,0,0,0,0,0], [0,0,0,0,0,0,1,0,1,1,1,1,0,0,0,0], [0,0,0,0,1,1,1,3,0,3,2,1,0,0,0,0], [0,0,0,0,1,2,0,3,4,1,1,1,0,0,0,0], [0,0,0,0,1,1,1,1,3,1,0,0,0,0,0,0], [0,0,0,0,0,0,0,1,2,1,0,0,0,0,0,0], [0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]; levels[1]=[ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0], [0,0,0,0,1,4,0,0,1,0,0,0,0,0,0,0], [0,0,0,0,1,0,3,3,1,0,1,1,1,0,0,0], [0,0,0,0,1,0,3,0,1,0,1,2,1,0,0,0], [0,0,0,0,1,1,1,0,1,1,1,2,1,0,0,0], [0,0,0,0,0,1,1,0,0,0,0,2,1,0,0,0], [0,0,0,0,0,1,0,0,0,1,0,0,1,0,0,0], [0,0,0,0,0,1,0,0,0,1,1,1,1,0,0,0], [0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]; levels[2]=[ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0], [0,0,0,0,1,0,0,0,0,0,1,1,1,0,0,0], [0,0,0,1,1,3,1,1,1,0,0,0,1,0,0,0], [0,0,0,1,0,4,0,3,0,0,3,0,1,0,0,0], [0,0,0,1,0,2,2,1,0,3,0,1,1,0,0,0], [0,0,0,1,1,2,2,1,0,0,0,1,0,0,0,0], [0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]; levels[3]=[ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0], [0,0,0,0,1,1,0,0,1,0,0,0,0,0,0,0], [0,0,0,0,1,4,3,0,1,0,0,0,0,0,0,0], [0,0,0,0,1,1,3,0,1,1,0,0,0,0,0,0], [0,0,0,0,1,1,0,3,0,1,0,0,0,0,0,0], [0,0,0,0,1,2,3,0,0,1,0,0,0,0,0,0], [0,0,0,0,1,2,2,5,2,1,0,0,0,0,0,0], [0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]; 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代码开源，但需要有一定JS语音基础方可阅读。我明白“ 授人以鱼不如授人以渔 ”的道理，所以代码中常常只留下自定义注释，方便大家修改，但不能凭此参透其中的奥妙，我并没有藏拙，好学的人自然会想办法寻找答案，自学也是人生的一门必修课。
推荐阅读以下内容：
Canvas线条动画
CSS旋转魔方
JS迷你键盘
CSS逼真小象
