游戏前端开发工具:canvas 2048小游戏

web前端开发工具 hb|2018前端开发工具|京东前端开发面试题

代码片段 1

<!DOCTYPE html>
<head>
    <title>前端开发2048小游戏</title>
    <meta charset=”utf-8″>
    <meta name=”viewport” content=”width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes”/>
    <style>
        html,
        body {
            width: 100%;
            margin: 0;
            padding: 0;
        }
        #scoreBoard {
            width: 100%;
            text-align: center;
            font-size: 15px;
            font-weight: bold;
        }
        #scoreBoard .title {
            color: #666;
        }
        #score {
            color: #ff6633;
        }
        #canvas {
            /*background-image: url(“images/background1.png”);*/
            position: absolute;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            margin: auto;
        }
        #again {
            position: absolute;
            z-index: 2;
            bottom: 0;
            width: 100%;
            text-align: center;
        }
        #again input {
            width: 280px;
            height: 40px;
            color: white;
            border: 0;
            background-color: #ff6633;
        }
    </style>
</head>
<body>
    <div id=”content”>
        <div id=”scoreBoard”>
            <br>
            <span class=”title”>分数:</span>
            <span id=”score”> 0</span>
        </div>
        <div id=”Game”>
            <canvas id=”canvas”>您的浏览器不支持canvas</canvas>
        </div>
        <div id=”again”>
            <input type=button value=”再 玩 儿 一 次” id=”moreTime”>
        </div>
    </div>
    <script>
/**
*animation.js
* redefine requestAnimationFrame
* @return requestAnimationFrame function
*/
        window.requestAnimationFrame = (function () {
            return window.requestAnimationFrame ||
                window.webkitRequestAnimationFrame ||
                window.mozRequestAnimationFrame ||
                function (callback) {
                    window.setTimeout(callback, 10);
                };
        })();
/**
*img.js
*/
        //图片对象
        var Img = (function () {
            function obj(position, value) {
                var me = this;
                me.colors = [“#EEE4DA”, “#EFE0CB”, “#F3B079”, “#F59565”, “#F75E3E”, “#FF6600”, “#EDCE71”, “#EDCD60”, “#FFCC33”, “#FF6633”, “#FFFF00”];
                me.txtColors = [“#666”, “#666”, “#fff”, “#fff”, “#fff”, “#fff”, “#fff”, “#fff”, “#fff”, “#fff”, “#fff”];
                me.sPosition = position; //图片开始的位置
                me.ePosition = { x: null, y: null };//图片移动的目标位置
                me.step = 0;
                me.arrived = false;//false表示需要移动,true表示不需要再移动
                me.value = value;
                me.img = new Image();
                me.img.src = “images/” + me.value + “.png”;
            }
            //按坐标绘制图片,参数:ctx为canvas上下文; width:图片宽度,height:图片高度
            obj.prototype.drawByPos = function (ctx, width, height) {
                var me = this;
                var x = me.sPosition.x * width + 15,
                    y = me.sPosition.y * height + 15;
                ctx.fillStyle = me.colors[me.value];
                ctx.fillRect(x, y, width – 10, height – 10);
                me.drawText(ctx, width, height, x, y);
            };
            obj.prototype.drawText = function (ctx, width, height, x, y) {
                var me = this;
                ctx.fillStyle = me.txtColors[me.value];
                ctx.font = width * 0.3 + “px sans-serif”;
                ctx.textAlign = “center”;
                ctx.textBaseline = “middle”;
                ctx.fillText(Math.pow(2, me.value), x + width * 0.4, y + height * 0.4);
            };
            //改变图片位置
            obj.prototype.move = function (ctx, width, height, der) {
                var me = this,
                    x = me.sPosition.x * width + 15,
                    y = me.sPosition.y * height + 15;
                me.step += 20;
                switch (der) {
                    case 37: {//向左,x减小
                        x = x – me.step;
                        if (x <= me.ePosition.x * width + 15) {
                            x = me.ePosition.x * width + 15;
                            me.sPosition.x = 0;
                            me.step = 0;
                            me.arrived = true;
                        }
                    } break;
                    case 38: {//向上,y减小
                        y = y – me.step;
                        if (y <= me.ePosition.y * height + 15) {
                            y = me.ePosition.y * height + 15;
                            me.sPosition.y = 0;
                            me.step = 0;
                            me.arrived = true;
                        }
                    } break;
                    case 39: {//向右,x增加
                        x = x + me.step;
                        if (x >= me.ePosition.x * width + 15) {
                            x = me.ePosition.x * width + 15;
                            me.sPosition.x = me.ePosition.x;
                            me.step = 0;
                            me.arrived = true;
                        }
                    } break;
                    case 40: {//向下,y增加
                        y = y + me.step;
                        if (y >= me.ePosition.y * height + 15) {
                            y = me.ePosition.y * height + 15;
                            me.sPosition.y = me.ePosition.y;
                            me.step = 0;
                            me.arrived = true;
                        }
                    } break;
                }
                ctx.fillStyle = me.colors[me.value];
                ctx.fillRect(x, y, width – 10, height – 10);
                me.drawText(ctx, width, height, x, y);
            };
            return obj;
        })();
        //背景对象
        var Background = (function () {
            function obj() {
            }
            obj.prototype.draw = function (ctx, cvs) {
                ctx.fillStyle = “#BCAD9D”;
                ctx.fillRect(0, 0, gl.cvs.width, gl.cvs.height);
                this.addRect(ctx, cvs);
            };
            obj.prototype.addRect = function (ctx, cvs) {
                gl.stdWidth = (cvs.width / 4 – 5) | 0;
                gl.stdHeight = gl.stdWidth;
                for (var i = 0; i < 4; i++) {
                    for (var j = 0; j < 4; j++) {
                        ctx.fillStyle = “#CDBFB5”;
                        ctx.fillRect(i * gl.stdWidth + 15, j * gl.stdHeight + 15, gl.stdWidth – 10, gl.stdHeight – 10);
                    }
                }
            };
            return obj;
        })();
/**
*handle.js
*/
        //产生一个新方块儿,参数为方块儿的值
        function getNewData(value) {
            var xx = (Math.random() * 40 | 0) % 4;
            var yy = (Math.random() * 40 | 0) % 4;
            if (!gl.map[xx][yy].Img) {
                gl.map[xx][yy].value = value;
                gl.map[xx][yy].Img = new Img({ x: xx, y: yy }, value);
                gl.map[xx][yy].Img.drawByPos(gl.ctx, gl.stdWidth, gl.stdHeight);
            } else {
                getNewData(value);
            }
        }
        //画背景
        function drawBack() {
            var back = new Background();
            back.draw(gl.ctx, gl.cvs);
        }
        //创建4 * 4地图
        function initMap() {
            gl.map = [];
            gl.gameScore = 0;
            gl.gameover = false;
            document.getElementById(“score”).innerHTML = gl.gameScore;
            for (var i = 0; i < 4; i++) {
                gl.map[i] = new Array();
                for (var j = 0; j < 4; j++) {
                    gl.map[i][j] = new Object();
                    gl.map[i][j].value = 0;
                    gl.map[i][j].flag = false;//标记是否合并过
                }
            }
            drawBack();
            getNewData(1);
            getNewData(1);
        }
        //查询已有方块儿
        function searchRect(der) {
            gl.queue.length = 0;
            for (var i = 0; i < 4; i++) {
                for (var j = 0; j < 4; j++) {
                    if (gl.map[i][j].Img) {
                        gl.map[i][j].Img.move(gl.ctx, gl.stdWidth, gl.stdHeight, der);
                        gl.queue.push(gl.map[i][j].Img);
                    }
                }
            }
        }
        //检查队列里的方块儿是否都移动完成
        function checkQueue() {
            for (var i = 0, len = gl.queue.length; i < len; i++) {
                if (!gl.queue[i].arrived) {
                    return false; //队列里还有未完成的方块儿
                }
            }
            return true;
        }
        //移动完成后,重绘地图
        function reDrawMap() {
            gl.ctx.clearRect(0, 0, gl.cvs.width, gl.cvs.height);
            var back = new Background();
            back.draw(gl.ctx, gl.cvs);
            for (var m = 0; m < 4; m++) {
                for (var p = 0; p < 4; p++) {
                    gl.map[m][p].flag = false;
                    if (gl.map[m][p].value > 0) {
                        gl.map[m][p].Img = new Img({ x: m, y: p }, gl.map[m][p].value);
                        gl.map[m][p].Img.drawByPos(gl.ctx, gl.stdWidth, gl.stdHeight);
                    } else {
                        if (gl.map[m][p].Img) {
                            delete gl.map[m][p].Img;
                        }
                    }
                }
            }
            document.getElementById(“score”).innerHTML = gl.gameScore;
        }
        //设置方块儿终点坐标
        function setOldPos(i, j, ki, kj) {
            gl.map[i][j].value = 0;
            gl.map[i][j].Img.ePosition.x = ki;
            gl.map[i][j].Img.ePosition.y = kj;
        }
        //向上运动时,遍历地图,寻找方块儿的终点目标(img.ePosition),以便移动,参数:test用于标记是否需要移动
        function searchMapUp(test) {
            var flagMove = false;
            for (var i = 0; i < 4; i++) {
                for (var j = 0; j < 4; j++) {
                    if (gl.map[i][j].value > 0) {//方块儿有值时
                        var t = gl.map[i][j].value;
                        if (j == 0) {
                            setOldPos(i, j, i, j);
                            gl.map[i][j].value = t;
                        }
                        for (var k = j – 1; k >= 0; k–) {
                            if (gl.map[i][k].value > 0) {//当上一个方块儿有值时
                                //当方块儿的值与上一个方块儿的值相等时,合并
                                if (gl.map[i][k].value == t && !gl.map[i][k].flag) {
                                    if (test == 1) { //若只是检测能否移动,不改变终点目标
                                        setOldPos(i, j, i, k);
                                        gl.gameScore += Math.pow(2, gl.map[i][k].value);
                                        gl.map[i][k].value++;
                                        gl.map[i][k].flag = true;
                                        if (gl.map[i][k].value == 11)//出现2048游戏通关
                                            gl.gameWin = true;
                                    }
                                    flagMove = true;
                                } else {//上方有方块儿,但2个方块儿的值不相同
                                    if (test == 1) {
                                        setOldPos(i, j, i, k + 1);
                                        gl.map[i][k + 1].value = t;
                                    }
                                    if (j != k + 1)
                                        flagMove = true;
                                }
                                break;
                            }
                            if (k == 0) {
                                if (test == 1) {
                                    setOldPos(i, j, i, k);
                                    gl.map[i][k].value = t;
                                }
                                flagMove = true;
                            }
                        }
                    }
                }
            }
            return flagMove;
        }
        //向下运动时
        function searchMapDown(test) {
            var flagMove = false;
            for (var i = 0; i < 4; i++) {
                for (var j = 3; j >= 0; j–) {
                    if (gl.map[i][j].value > 0) {
                        var t = gl.map[i][j].value;
                        if (j == 3) {
                            setOldPos(i, j, i, j); gl.map[i][j].value = t;
                        }
                        for (var k = j + 1; k < 4; k++) {
                            if (gl.map[i][k].value > 0) {
                                if (gl.map[i][k].value == t && !gl.map[i][k].flag) {
                                    if (test == 1) {
                                        setOldPos(i, j, i, k);
                                        gl.gameScore += Math.pow(2, gl.map[i][k].value);
                                        gl.map[i][k].value++;
                                        gl.map[i][k].flag = true;
                                        if (gl.map[i][k].value == 11)//出现2048游戏通关
                                            gl.gameWin = true;
                                    }
                                    flagMove = true;
                                } else {
                                    if (test == 1) {
                                        setOldPos(i, j, i, k – 1);
                                        gl.map[i][k – 1].value = t;
                                    }
                                    if (j != k – 1)
                                        flagMove = true;
                                }
                                break;
                            }
                            if (k == 3) {
                                if (test == 1) {
                                    setOldPos(i, j, i, k);
                                    gl.map[i][k].value = t;
                                }
                                flagMove = true;
                            }
                        }
                    }
                }
            }
            return flagMove;
        }
        //向左运动时
        function searchMapLeft(test) {
            var flagMove = false;
            for (var j = 0; j < 4; j++) {
                for (var i = 0; i < 4; i++) {
                    if (gl.map[i][j].value > 0) {
                        var t = gl.map[i][j].value;
                        if (i == 0) {
                            setOldPos(i, j, i, j);
                            gl.map[i][j].value = t;
                        }
                        for (var k = i – 1; k >= 0; k–) {
                            if (gl.map[k][j].value > 0) {
                                if (gl.map[k][j].value == t && !gl.map[k][j].flag) {
                                    if (test == 1) {
                                        setOldPos(i, j, k, j);
                                        gl.gameScore += Math.pow(2, gl.map[k][j].value);
                                        gl.map[k][j].value++;
                                        gl.map[k][j].flag = true;
                                        if (gl.map[k][j].value == 11)//出现2048游戏通关
                                            gl.gameWin = true;
                                    }
                                    flagMove = true;
                                } else {
                                    if (test == 1) {
                                        setOldPos(i, j, k + 1, j);
                                        gl.map[k + 1][j].value = t;
                                    }
                                    if (i != k + 1)
                                        flagMove = true;
                                }
                                break;
                            }
                            if (k == 0) {
                                if (test == 1) {
                                    setOldPos(i, j, k, j);
                                    gl.map[k][j].value = t;
                                }
                                flagMove = true;
                            }
                        }
                    }
                }
            }
            return flagMove;
        }
        //向右运动时
        function searchMapRight(test) {
            var flagMove = false;
            for (var j = 0; j < 4; j++) {
                for (var i = 3; i >= 0; i–) {
                    if (gl.map[i][j].value > 0) {
                        var t = gl.map[i][j].value;
                        if (i == 3) {
                            setOldPos(i, j, i, j);
                            gl.map[i][j].value = t;
                        }
                        for (var k = i + 1; k < 4; k++) {
                            if (gl.map[k][j].value > 0) {
                                if (gl.map[k][j].value == t && !gl.map[k][j].flag) {
                                    if (test == 1) {
                                        setOldPos(i, j, k, j);
                                        gl.gameScore += Math.pow(2, gl.map[k][j].value);
                                        gl.map[k][j].value++;
                                        gl.map[k][j].flag = true;
                                        if (gl.map[k][j].value == 11)//出现2048游戏通关
                                            gl.gameWin = true;
                                    }
                                    flagMove = true;
                                } else {
                                    if (test == 1) {
                                        setOldPos(i, j, k – 1, j);
                                        gl.map[k – 1][j].value = t;
                                    }
                                    if (i != k – 1)
                                        flagMove = true;
                                }
                                break;
                            }
                            if (k == 3) {
                                if (test == 1) {
                                    setOldPos(i, j, k, j);
                                    gl.map[k][j].value = t;
                                }
                                flagMove = true;
                            }
                        }
                    }
                }
            }
            return flagMove;
        }
/**
*game.js
*/
        //全局变量
        var gl = {
            cvs: null,
            ctx: null,
            stdWidth: 0,//方块儿宽度
            stdHeight: 0,
            gameScore: 0,//游戏总分
            gameWin: false,//是否通关
            map: [],//地图
            queue: []//动画队列
        };
        (function () {
            gl.cvs = document.getElementById(‘canvas’);
            gl.ctx = gl.cvs.getContext(‘2d’);
            setCanvasSize();
            initMap();
            //再玩儿一次
            document.getElementById(“moreTime”).onclick = function () {
                initMap();
            };
            document.onkeydown = function (event) {
                var e = event || window.event;
                derection(e.keyCode);
            };
            function setCanvasSize() {
/*if(window.innerWidth < window.innerHeight){
gl.cvs.width = window.innerWidth * 0.8;
gl.cvs.height = gl.cvs.width;
}else{
gl.cvs.height = window.innerHeight * 0.8;
gl.cvs.width = gl.cvs.height;
}
if(gl.cvs.width < 250){
gl.cvs.width = 250;
gl.cvs.height = 250;
}else if(gl.cvs.width > 400){
gl.cvs.width = 400;
gl.cvs.height = 400;
}*/
                gl.cvs.width = 400;
                gl.cvs.height = 400;
            }
            function derection(der) {
                if (!checkQueue()) //一次滑动完成之前不能继续滑动
                    return;
                gameover();//判断游戏是否结束
                var flagMove = false;
                switch (der) {
                    case 37: flagMove = searchMapLeft(1); break;
                    case 38: flagMove = searchMapUp(1); break;
                    case 39: flagMove = searchMapRight(1); break;
                    case 40: flagMove = searchMapDown(1); break;
                    default: break;
                }
                if (flagMove)
                    slide(der);
            }
            function slide(der) {
                gl.ctx.clearRect(0, 0, gl.cvs.width, gl.cvs.height);
                var back = new Background();
                back.draw(gl.ctx, gl.cvs);
                searchRect(der);
                if (checkQueue()) {
                    if (!gameWin()) {
                        reDrawMap();
                        getNewData(1);
                    }
                } else {
                    window.requestAnimationFrame(function () { slide(der); });
                }
            }
            function gameover() {
                var f1 = searchMapLeft(0),
                    f2 = searchMapUp(0),
                    f3 = searchMapRight(0),
                    f4 = searchMapDown(0);
                if (f1 || f2 || f3 || f4) {
                    return false;
                } else {
                    document.onkeydown = null;
                    document.removeEventListener(“touchstart”, touchstart, false);
                    document.removeEventListener(“touchmove”, touchmove, false);
                    document.removeEventListener(“touchend”, touchend, false);
                    alert(“游戏结束啦!”);
                    return true;
                }
            }
            function gameWin() {
                if (gl.gameWin) {
                    alert(“恭喜你,通过成功!!!”);
                    document.onkeydown = null;
                    document.removeEventListener(“touchstart”, touchstart, false);
                    document.removeEventListener(“touchmove”, touchmove, false);
                    document.removeEventListener(“touchend”, touchend, false);
                    return true;
                }
                return false;
            }
            var startPos = { x: null, y: null }, endPos = { x: null, y: null };
            document.addEventListener(“touchstart”, touchstart, false);
            function touchstart(event) {
                var touch = event.touches[0];
                startPos.x = touch.pageX;
                startPos.y = touch.pageY;
                document.addEventListener(“touchmove”, touchmove, false);
                document.addEventListener(“touchend”, touchend, false);
            }
            function touchmove(event) {
                var touch = event.touches[0];
                endPos.x = touch.pageX;
                endPos.y = touch.pageY;
                computeDirection();
            }
            function touchend() {
                document.removeEventListener(“touchmove”, touchmove, false);
                document.addEventListener(“touchend”, touchend, false);
            }
            //计算滑动方向
            function computeDirection() {
                if (!checkQueue()) //一次滑动完成之前不能继续滑动
                    return;
                gameover();//判断游戏是否结束
                var flagMove = false;
                var x0 = endPos.x – startPos.x,
                    y0 = endPos.y – startPos.y;
                if (x0 > 0 && Math.abs(x0) > Math.abs(y0)
                    || x0 > 0 && Math.abs(x0) > Math.abs(y0)) {
                    flagMove = searchMapRight(1);//alert(“right”);
                    der = 39;
                } else if (y0 < 0 && Math.abs(x0) < Math.abs(y0)
                    || y0 < 0 && Math.abs(x0) < Math.abs(y0)) {
                    flagMove = searchMapUp(1);//alert(“top”);
                    der = 38;
                } else if (x0 < 0 && Math.abs(x0) > Math.abs(y0)
                    || x0 < 0 && Math.abs(x0) > Math.abs(y0)) {
                    flagMove = searchMapLeft(1);//alert(“left”);
                    der = 37;
                } else if (y0 > 0 && Math.abs(x0) < Math.abs(y0)
                    || y0 > 0 && Math.abs(x0) < Math.abs(y0)) {
                    flagMove = searchMapDown(1);//alert(“down”);
                    der = 40;
                }
                if (flagMove)
                    slide(der);
            }
        })();
    </script>
</body>
</html>

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