JS+ Html 画布实现的时钟
效果图:
闲来无聊做了一个网页的时钟,效果模拟传统时钟的运行方式,
运用了html 的画布实现指针,背景图片引用了网络图片。
具体原理:
首先将时钟分为四个不同区域,对每个区域计算cos,sin 来确实指针顶点位置。在通过画布来绘画出指针。
通过setInterval 每秒刷新指针位置实现 传统机械表针的动态跳动。
本人是JS开发程序员,从业1年多。闲来无聊的简单页面,
欢迎大家提问,或者建议。共同进步
代码部分,直接复制HTML 文件中即可查看效果:
<!DOCTYPE html><html><head><meta charset=utf-8><title>clock</title></head><body style="color:green; <!--background-image:url('/upload/b/f0/bf0d97dcee487096548e6edbc89d4963_thumb.png');--> background-size:100%; background-repeat: no-repeat; background-attachment:fixed"><div style="width: 900px; height: 900px; margin-top: 50px; margin-left: 50px;"><div style="position: absolute; left:119px;top: 193px; width: 900px; height: 900px; background-image:url('/upload/b/f0/bf0d97dcee487096548e6edbc89d4963_thumb.png'); background-repeat: no-repeat; z-index: -1;"></div><canvas id="t" width="800" height="800"></canvas><div style="position: absolute; left:118px;top: 464px; width: 100px; height: 200px; background-color: white; background-repeat: no-repeat; z-index: 10;"></div></div><script language="javascript">var s = setInterval(moveI, 1000);function moveI() {var c = document.getElementById("t");var pc = c.getContext("2d");c.height = c.height;//秒pc.lineWidth = 3;pc.strokeStyle = 'rgba(255,0,0,0.8)';var now = new Date();var sindex = getxy(150, now.getSeconds());pc.moveTo(400, 400);pc.lineTo(sindex.x, sindex.y);pc.stroke();pc.beginPath();//分pc.lineWidth = 7;pc.strokeStyle = 'rgba(50,50,50,0.8)';var mindex = getxy(120, now.getMinutes() + (now.getSeconds() / 60));pc.moveTo(400, 400);pc.lineTo(mindex.x, mindex.y);pc.stroke();pc.beginPath();//时pc.lineWidth = 10;pc.strokeStyle = 'rgba(0,0,0,0.8)';var hindex = getxy(80, ((now.getHours() > 12 ? now.getHours() - 12 : now.getHours()) + (now.getMinutes() / 60)) * 5);pc.moveTo(400, 400);pc.lineTo(hindex.x, hindex.y);pc.stroke();};function getxy(r, t) {//计算分区 0,1,2,3var a = parseInt(t / 15);//分区角度t = t - 15 * a;var y;var x;//基于分区的坐标计算switch (a) {case 0:y = r - (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));x = r + (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));break;case 1:y = r + (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));x = r + (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));break;case 2:y = r + (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));x = r - (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));break;case 3:y = r - (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));x = r - (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));break;default:break;}y = (400 - r) + y;x = (400 - r) + x;return {'x': x,'y': y};};</script></body></html>
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