JavaScript 推箱子游戏

推箱子游戏的逻辑非常简单，但是如果不动手的话，还是不太清楚。我在这里讲一下自己的思路。
制作推箱子，首先要有自己的设计素材。如下我也是网上找的素材
第二步，理清游戏的规则。
游戏规则：
1.小人将箱子分别推到球上，等每个箱子都覆盖到球上，则完成游戏。
2.小人不能推树，不能推两个箱子一起
3.小人可以踩球
第三步，简单的理清游戏规则后，就开始选用技术。首先肯定是JavaScript，然后选用canvas。
最后，我们开始制作游戏。
制作游戏其实也是一步步来。做事不能太急。要分成阶段性来完成，就很方便。
具体代码如下。
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>

</head>

<body>

    <canvas id="canvas" width="560" height="560">

        can't see this

    </canvas>

    <div id="msg"></div>

    <img id="block" src="./img/block.gif" alt="" style="display:none;">

    <img id="wall" src="./img/wall.png" alt="" style="display:none;">

    <img id="box" src="./img/box.png" alt="" style="display:none;">

    <img id="down" src="./img/down.png" alt="" style="display:none;">

    <img id="left" src="./img/left.png" alt="" style="display:none;">

    <img id="right" src="./img/right.png" alt="" style="display:none;">

    <img id="up" src="./img/up.png" alt="" style="display:none;">

    <img id="ball" src="./img/ball.png" alt="" style="display:none;">

    <p id="msg"></p>

    <input type="button" value="上一关" onclick="level(-1)">

    <input type="button" value="重玩" onclick="level(0)">

    <input type="button" value="下一关" onclick="level(1)">

    <script src="./js/map.js"></script>

    <script>

        var canvas = document.getElementById('canvas');

        var ctx = canvas.getContext('2d');

        var dWidth = 35,

            dHeight = 35;

        var iCurLevel = 0; //当前关卡+1

        var steps = 0; // 移动步数

        var currenMap = [],

            userMap = [];

        var msg = document.getElementById('msg');

        var block = document.getElementById('block');

        var wall = document.getElementById('wall');

        var box = document.getElementById('box');

        var down = document.getElementById('down');

        var left = document.getElementById('left');

        var right = document.getElementById('right');

        var up = document.getElementById('up');

        var ball = document.getElementById('ball');

        var curMan = down; //小人面向

        // 复制二维数组

        function copyArray(arr) {

            var newArr = [];

            for (var i = 0; i < arr.length; i++) {

                newArr[i] = arr[i].concat();

            }

            return newArr;

        }

        // 初始化

        function init() {

            currenMap = copyArray(levels[iCurLevel]) // 当前原样地图

            userMap = copyArray(levels[iCurLevel]) // 当前使用地图

            steps = 0; // 初始化步数

            curMan = down; // 初始化小人面朝下

            msg.innerHTML = "当前第：" + (iCurLevel + 1) + "关，移动步数：" + steps;

            drawBlock() // 画草地

            drawMap(currenMap) // 画关卡地图

        }

        // 画草地

        function drawBlock() {

            for (var i = 0; i < 16; i++) {

                for (var j = 0; j < 16; j++) {

                    ctx.drawImage(block, i * dWidth, j * dHeight, dWidth, dHeight);

                }

            }

        }

        // 画小人位置

        function Point(x, y) {

            this.x = x;

            this.y = y;

        }

        var per_position = new Point(5, 5);

        // 画关卡地图

        function drawMap(level) {

            for (var i = 0; i < level.length; i++) {

                for (var j = 0; j < level[i].length; j++) {

                    var pic = block;

                    switch (level[i][j]) {

                        case 0:

                            pic = block;

                            break;

                        case 1:

                            pic = wall;

                            break;

                        case 2:

                            pic = ball;

                            break;

                        case 3:

                            pic = box;

                            break;

                        case 4:

                            pic = curMan;

                            per_position.x = i;

                            per_position.y = j;

                            break;

                        case 5:

                            pic = box;

                            break;

                    }

                    ctx.drawImage(pic, j * dWidth - (pic.width - dWidth) / 2, i * dHeight - (pic.height - dHeight), pic.width, pic.height);

                }

            }

        }

        // 切换关卡

        function level(next) {

            iCurLevel += next

            if (iCurLevel < 0) {

                alert('当前第一关');

                return;

            }

            if (iCurLevel > levels.length - 1) {

                alert('当前最后一关');

                return;

            }

            init();

        }

        // 绑定键盘 up down left right

        document.onkeydown = function curManUp(event) {

            var keyCode = event.keyCode;

            var p1 = {

                x: 0,

                y: 0

            }

            var p2 = {

                x: 0,

                y: 0

            }

            switch (keyCode) {

                case 38:

                    curMan = up;

                    p1.x = per_position.x - 1;

                    p1.y = per_position.y;

                    p2.x = per_position.x - 2;

                    p2.y = per_position.y;

                    break;

                case 39:

                    curMan = right;

                    p1.x = per_position.x;

                    p1.y = per_position.y + 1;

                    p2.x = per_position.x;

                    p2.y = per_position.y + 2;

                    break;

                case 40:

                    curMan = down;

                    p1.x = per_position.x + 1;

                    p1.y = per_position.y;

                    p2.x = per_position.x + 2;

                    p2.y = per_position.y;

                    break;

                case 37:

                    curMan = left;

                    p1.x = per_position.x;

                    p1.y = per_position.y - 1;

                    p2.x = per_position.x;

                    p2.y = per_position.y - 2;

                    break;

            }

            // 墙1，盒子3和墙1，盒子3和盒子3，盒子3和陷阱5,陷阱5和盒子3，陷阱5和墙1 都不能移动！

            if (userMap[p1.x][p1.y] == 1) {

                return false;

            }

            if (userMap[p1.x][p1.y] == 3 && (userMap[p2.x][p2.y] == 1 || userMap[p2.x][p2.y] == 3 || userMap[p2.x][p2.y] == 5)) {

                return false;

            }

            if (userMap[p1.x][p1.y] == 5 && (userMap[p2.x][p2.y] == 1 || userMap[p2.x][p2.y] == 3 || userMap[p2.x][p2.y] == 5)) {

                return false;

            }

            // 草地0 可以移动

            if (userMap[p1.x][p1.y] == 0) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

            }

            // 盒子和草地 可以移动

            if (userMap[p1.x][p1.y] == 3 && userMap[p2.x][p2.y] == 0) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

                userMap[p2.x][p2.y] = 3

            }

            // 盒子和球 可以移动

            if (userMap[p1.x][p1.y] == 3 && userMap[p2.x][p2.y] == 2) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

                userMap[p2.x][p2.y] = 5

            }

            // 球2 可以移动

            if (userMap[p1.x][p1.y] == 2) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

            }

            // 陷阱5和草地 可以移动

            if (userMap[p1.x][p1.y] == 5 && userMap[p2.x][p2.y] == 0) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

                userMap[p2.x][p2.y] = 3

            }

            // 陷阱5和球 可以移动

            if (userMap[p1.x][p1.y] == 5 && userMap[p2.x][p2.y] == 2) {

                userMap[per_position.x][per_position.y] = 0;

                userMap[p1.x][p1.y] = 4;

                userMap[p2.x][p2.y] = 5

            }

            // 当前小人位置 原先是球的话

            if (currenMap[per_position.x][per_position.y] == 2 || currenMap[per_position.x][per_position.y] == 5) {

                userMap[per_position.x][per_position.y] = 2;

            }

            steps++;

            msg.innerHTML = "当前第：" + (iCurLevel + 1) + "关，移动步数：" + steps

            drawBlock();

            drawMap(userMap);

            if (win()) {

                level(1);

            }

        }

        // 判断是否结束

        function win() {

            for (var i = 0; i < currenMap.length; i++) {

                for (var j = 0; j < currenMap[i].length; j++) {

                    if (currenMap[i][j] == 2 && userMap[i][j] !== 5 || currenMap[i][j] == 5 && userMap[i][j] !== 5) {

                        return false;

                    }

                }

            }

            return true;

        }

        // 初始化

        init()

    </script>

</body>

</html>
具体注释都很清楚了。希望大家能喜欢
oooO ↘┏━┓ ↙ Oooo ( 踩)→┃你┃ ←(死 ) \ ( →┃√┃ ← ) / 　 \_)↗┗━┛ ↖(_/
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JavaScript 推箱子游戏

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