64.canvas画一个表（1） 

<!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');

        function setCanvasStrokeStyle() {

        }

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

        function drawHours() {
            let rad = 2 * Math.PI / 12
            for (let i = 1; i <= 12; i++) {
                ctx.save();
                ctx.beginPath();
                ctx.translate(centerX, centerY);
                ctx.rotate(rad * 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() {
            let rad = 2 * Math.PI / 60
            for (let i = 1; i <= 60; i++) {
                ctx.save();
                ctx.beginPath();
                ctx.translate(centerX, centerY);
                ctx.rotate(rad * 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()

            }
        }
        // 画时针 分针 秒针
        function drawTimeLine() {
            ctx.beginPath();
            ctx.arc(centerX, centerY, 20, 0, Math.PI * 2, true);
            ctx.fillStyle = "orange";
            ctx.fill();
            // 时针
            ctx.save()
            ctx.beginPath();
            ctx.lineWidth = 10;
            ctx.translate(centerX, centerY);
            ctx.rotate(Math.PI / 4)
            ctx.translate(-centerX, -centerY);
            ctx.moveTo(centerX, centerY);
            ctx.lineTo(centerX, centerY - r + 148);
            ctx.stroke();
            ctx.restore()
                // 分针
            ctx.save()

            ctx.beginPath();
            ctx.translate(centerX, centerY);
            ctx.rotate(Math.PI / 2)
            ctx.translate(-centerX, -centerY);
            ctx.lineWidth = 6;
            ctx.moveTo(centerX, centerY);
            ctx.lineTo(centerX, centerY - r + 108);
            ctx.stroke();
            ctx.restore()

            // 秒针
            ctx.beginPath();
            ctx.lineWidth = 4;
            ctx.moveTo(centerX, centerY);
            ctx.lineTo(centerX, centerY - r + 68);
            ctx.stroke();

        }
        drawClock();
        drawHours();
        drawMinutes();
        drawTimeLine();
    </script>
</body>

</html>

　　

posted @ 2019-05-15 22:04  famCc  阅读(312)  评论(0)    收藏  举报