HTML坦克大战学习02---坦克动起来

时间：2022-05-05 08:12:12
<!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(, , , );

        //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, , );

            //画出右边

            cxt.fillRect(hero.x + , hero.y, , );

            //中间矩形

            cxt.fillRect(hero.x + , hero.y + , , );

            //画出坦克的盖子

            cxt.fillStyle = "#FFD972";

            cxt.arc(hero.x + , hero.y + , , , , true);

            cxt.fill();

            //车出炮线

            cxt.strokeStyle = "#FFD972";

            cxt.lineWidth = 1.5;

            cxt.beginPath();

            cxt.moveTo(hero.x + , hero.y + );

            cxt.lineTo(hero.x + , hero.y);

            cxt.closePath();

            cxt.stroke();

        }

        //接收键盘命令

        function getCommand() {

            var code = event.keyCode;

            //alert(code);

            switch (code) {

                case :

                    hero.moveUp();

                    break;

                case :

                    hero.moveRight();

                    break;

                case :

                    hero.moveDown();

                    break;

                case :

                    hero.moveLeft();

                    break;

            }

            cxt.clearRect(, , , );

            darwTank(hero);

        }

    </script>

</body>

</html>

HTML坦克大战学习02---坦克动起来HTML坦克大战学习02---坦克动起来



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