很多博客都一个圆形时钟摆件，看起来很炫。今天我借助HTML5和Canvas为大家实现一款会动的圆形时钟。
在学习本文之前，你需要对HTML5和Canvas有一定的基础知识。本案例的代码非常精简，总代码100行左右。下面我们先看看该时钟动画的运行效果。
下面是该案例的实现源码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML5 Canvas 圆形时钟动画|：www.xttblog.com</title>
<style type="text/css">
#myCanvas{
display: block;
margin:10px auto;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="400" height="400"></canvas>
<script type="text/javascript">
var myCanvas = document.getElementById('myCanvas');
var c = myCanvas.getContext('2d');
function clock(){
c.clearRect(0,0,400,400);
var data = new Date();
var sec =data.getSeconds();
var min =data.getMinutes();
var hour=data.getHours();
//：www.xttblog.com
c.save();
c.translate(200,200);
c.rotate(-Math.PI/2);
//：www.xttblog.com
//分钟刻度线
for(var i=0;i<60;i++){ //画12个刻度线
c.beginPath();
c.strokeStyle = "#f00";
c.lineWidth = 5 ;
c.moveTo(117,0);
c.lineTo(120,0);
c.stroke();
c.rotate(Math.PI/30); //每个6deg画一个时钟刻度线
c.closePath();
}
//：www.xttblog.com
//时钟刻度线
for(var i=0;i<12;i++){ //画12个刻度线
c.beginPath();
c.strokeStyle = "#000";
c.lineWidth = 8 ;
c.moveTo(100,0);
c.lineTo(120,0);
c.stroke();
c.rotate(Math.PI/6); //每个30deg画一个时钟刻度线
c.closePath();
}
//外表盘
c.beginPath();
c.strokeStyle = "pink";
c.arc(0,0,145,0,Math.PI*2);
c.lineWidth = 12 ;
c.stroke();
c.closePath();
//：www.xttblog.com
//画时针
hour = hour>12?hour-12:hour;
//console.log(hour);
c.beginPath();
c.save();
c.rotate(Math.PI/6*hour+Math.PI/6*min/60+Math.PI/6*sec/3600);
c.strokeStyle = "yellowgreen";
c.lineWidth = 4 ;
c.moveTo(-20,0);
c.lineTo(50,0);
c.stroke();
c.restore();
c.closePath();
//：www.xttblog.com
//画分针
//console.log(min);
c.beginPath();
c.save();
c.rotate(Math.PI/30*min+Math.PI/30*sec/60);
c.strokeStyle = "springgreen";
c.lineWidth = 3 ;
c.moveTo(-30,0);
c.lineTo(70,0);
c.stroke();
c.restore();
c.closePath();
//画秒针
c.beginPath();
c.save();
c.rotate(Math.PI/30*sec);
c.strokeStyle = "red";
c.lineWidth = 2 ;
c.moveTo(-40,0);
c.lineTo(120,0);
c.stroke();
c.restore();
c.closePath();
c.restore();
}
clock();
setInterval(clock,1000);
</script>
</body>
</html>
喜欢的朋友可以自行的将源码保存到文件中运行看看效果。
： » HTML5+Canvas实现一款圆形时钟动画特效
原创文章，作者：Carrie001128，如若转载，请注明出处：https://blog.ytso.com/tech/aiops/251344.html