65.canvas画一个表（2）

<!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>
    <style>
        body {
            margin: 0;
            padding: 0;
            text-align: center;
        }
    </style>
</head>

<body>
    <canvas id="canvas"></canvas>
    <script>
        let canvasWidth = 600;
        let canvasHeight = 600;
        let centerX = canvasWidth / 2;
        let centerY = canvasHeight / 2;
        let r = canvasWidth / 2 - 4;
        let canvas = document.getElementById('canvas');
        canvas.width = canvasWidth;
        canvas.height = canvasHeight;
        let ctx = canvas.getContext('2d');
        let sRad = Math.PI * 2 / 60;
        let mRad = Math.PI * 2 / 60;
        let hRad = Math.PI * 2 / 12;

        function drawClock() {
            ctx.beginPath();
            ctx.clearRect(0, 0, 1000, 1000);
            ctx.strokeStyle = "orange";
            ctx.lineWidth = 4;
            ctx.arc(centerX, centerY, r, 0, Math.PI * 2, true);
            ctx.stroke()
        }

        function drawHours() {
            for (let i = 1; i <= 12; i++) {
                ctx.save();
                ctx.beginPath();
                ctx.translate(centerX, centerY);
                ctx.rotate(hRad * i)
                ctx.translate(-centerX, -centerY);
                ctx.strokeStyle = "orange";
                ctx.lineWidth = 4;
                ctx.moveTo(centerX, centerY - r);
                ctx.lineTo(centerX, centerY - r + 24);
                ctx.font = "26px Arial";
                ctx.textAlign = "center";
                ctx.fillStyle = "orange";
                ctx.fillText(i, centerX, centerY - r + 54);
                ctx.stroke();
                ctx.restore()

            }
        }

        function drawMinutes() {
            for (let i = 1; i <= 60; i++) {
                ctx.save();
                ctx.beginPath();
                ctx.translate(centerX, centerY);
                ctx.rotate(mRad * i)
                ctx.translate(-centerX, -centerY);
                ctx.strokeStyle = "orange";
                ctx.lineWidth = 2;
                ctx.moveTo(centerX, centerY - r);
                ctx.lineTo(centerX, centerY - r + 16);
                ctx.stroke();
                ctx.restore()

            }
            ctx.beginPath();
            ctx.arc(centerX, centerY, 20, 0, Math.PI * 2, true);
            ctx.fillStyle = "orange";
            ctx.fill();
        }
        // 画时针 分针 秒针
        function drawTimeLine2(rad, lineWidth, offset) {
            // 时针
            ctx.save()
            ctx.beginPath();
            ctx.lineWidth = lineWidth;
            ctx.translate(centerX, centerY);
            ctx.rotate(rad)
            ctx.translate(-centerX, -centerY);
            ctx.moveTo(centerX, centerY);
            ctx.lineTo(centerX, centerY - r + offset);
            ctx.stroke();
            ctx.restore()
        }


        function render() {
            requestAnimationFrame(render);
            drawClock();
            drawHours();
            drawMinutes();
            var timeNow = new Date();
            var h = timeNow.getHours();
            var m = timeNow.getMinutes();
            var s = timeNow.getSeconds();
            var sRadNow = sRad * s;
            var mRadNow = mRad * (m + s / 60);
            var hRadNow = hRad * (h + m / 60 + s / 3600);
            drawTimeLine2(sRadNow, 4, 68);
            drawTimeLine2(mRadNow, 6, 108);
            drawTimeLine2(hRadNow, 10, 148);
        }
        render();
    </script>
</body>

</html>
65.canvas画一个表（2）

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