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HTML坦克大战学习02---坦克动起来

2024-07-13 21:59:08   223人阅读

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <title></title></head><body onkeydown="getCommand()">    <canvas id="tankMap" width="400px" height="300px" style="background-color: black"></canvas>    <script type="text/javascript">        //得到画布        var canvas1 = document.getElementById("tankMap");        //取得画布画笔对象        var cxt = canvas1.getContext("2d");        //定义一个Hero类        //x表示横坐标，主表示纵坐标        function Hero(x, y, direct, speed) {            this.x = x;            this.y = y;            this.speed = speed;            this.direct = direct;            //向上            this.moveUp = function () {                this.y -= this.speed;            }            //向右            this.moveRight = function () {                this.x += this.speed;            }            //向下            this.moveDown = function () {                this.y += this.speed;            }            //向左移            this.moveLeft = function () {                this.x -= this.speed;            }        }        //我的坦克 w表示向上,d表示向右 s表示向下 a表示向左        var hero = new Hero(140, 140, 0, 10);        //先画出坦克        darwTank(hero);        //绘制坦克对象        function darwTank(hero) {            //画出坦克            cxt.fillStyle = "#DED284";            //画出左面            cxt.fillRect(hero.x, hero.y, 5, 30);            //画出右边            cxt.fillRect(hero.x + 15, hero.y, 5, 30);            //中间矩形            cxt.fillRect(hero.x + 6, hero.y + 5, 8, 20);            //画出坦克的盖子            cxt.fillStyle = "#FFD972";            cxt.arc(hero.x + 10, hero.y + 15, 4, 0, 360, true);            cxt.fill();            //车出炮线            cxt.strokeStyle = "#FFD972";            cxt.lineWidth = 1.5;            cxt.beginPath();            cxt.moveTo(hero.x + 10, hero.y + 15);            cxt.lineTo(hero.x + 10, hero.y);            cxt.closePath();            cxt.stroke();        }        //接收键盘命令        function getCommand() {            var code = event.keyCode;            //alert(code);            switch (code) {                case 87:                    hero.moveUp();                    break;                case 68:                    hero.moveRight();                    break;                case 83:                    hero.moveDown();                    break;                case 65:                    hero.moveLeft();                    break;            }            cxt.clearRect(0, 0, 400, 300);            darwTank(hero);        }    </script></body></html>































        

            
                
                  
                
                

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