使用HTML5中的Canves标签制作时钟特效

时间：2022-07-28 20:18:41
<!DOCTYPE html >

<html>

<head>

</head>

<body>

    <canvas id="clock" width=" 500" height=" 500">

您的浏览器暂时不支持canvas标签，无法看到时钟！

</canvas>

    <script type="text/javascript">

        var clock = document.getElementById("clock");

        var cxt = clock.getContext('2d');

        function drawClock() {

            cxt.clearRect(0, 0, 500, 500);

            var now = new Date();

            var sec = now.getSeconds();

            var mi = now.getMinutes();

            var hour = now.getHours();

            hour = hour > 12 ? hour - 12 : hour;

            hour = hour + mi / 60;

            //画表盘

            cxt.lineWidth = 13;

            cxt.strokeStyle = "blue";

            cxt.beginPath();

            cxt.arc(250, 250, 200, 0, 360, false);

            cxt.closePath();

            cxt.stroke();

            //刻度

            //时刻度

            for (var i = 0; i < 12; i++) {

                cxt.save();

                //设置时针刻度的粗细

                cxt.lineWidth = 7;

                //设置时针刻度的颜色

                cxt.strokeStyle = "#000";

                //先设置0,0点

                cxt.translate(250, 250);

                cxt.rotate(i * 30 * Math.PI / 180); //角度*Math/180=弧度

                cxt.beginPath();

                cxt.moveTo(0, -170);

                cxt.lineTo(0, -190);

                cxt.closePath();

                cxt.stroke();

                cxt.restore();

            }

            //秒刻度

            for (var i = 0; i < 60; i++) {

                cxt.save();

                cxt.lineWidth = 3;

                cxt.strokeStyle = "#000";

                cxt.translate(250, 250);

                cxt.rotate(i * 6 * Math.PI / 180);

                cxt.beginPath();

                cxt.moveTo(0, -180);

                cxt.lineTo(0, -190);

                cxt.closePath();

                cxt.stroke();

                cxt.restore();

            }

            //时针

            cxt.save();

            cxt.lineWidth = 7;

            cxt.strokeStyle = "#000";

            cxt.translate(250, 250);

            cxt.rotate(hour * 30 * Math.PI / 180);

            cxt.beginPath();

            cxt.moveTo(0, -140);

            cxt.lineTo(0, 10);

            cxt.closePath();

            cxt.stroke();

            cxt.restore();

            //分针

            cxt.save();

            cxt.lineWidth = 5;

            cxt.strokeStyle = "#000";

            cxt.translate(250, 250);

            cxt.rotate(mi * 6 * Math.PI / 180);

            cxt.beginPath();

            cxt.moveTo(0, -160);

            cxt.lineTo(0, 15);

            cxt.closePath();

            cxt.stroke();

            cxt.restore();

            //秒针

            cxt.save();

            cxt.lineWidth = 3;

            cxt.strokeStyle = "red";

            cxt.translate(250, 250);

            cxt.rotate(sec * 6 * Math.PI / 180);

            cxt.beginPath();

            cxt.moveTo(0, -170);

            cxt.lineTo(0, 20);

            cxt.closePath();

            cxt.stroke();

            //画出时针，分针，秒针的交叉点

            cxt.beginPath();

            cxt.arc(0, 0, 5, 0, 360, false);

            cxt.closePath();

            cxt.fillStyle = "gray";

            cxt.fill();

            cxt.stroke();

            //画出时针，分针，秒针的交叉点

            cxt.beginPath();

            cxt.arc(0, -140, 3, 0, 360, false);

            cxt.closePath();

            cxt.fillStyle = "gray";

            cxt.fill();

            cxt.stroke();

            cxt.restore();

        }

        drawClock();

        window.setInterval(drawClock, 1000);

    </script>

</body>

</html>

相关文章