Posted in Javascript onSeptember 05, 2020
本文实例为大家分享了javascript canvas实现简易时钟的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>钟表</title>
<script type="text/javascript">
window.onload=function(){
//1.获取画布
var canvas=document.getElementById("canvas");
//2.获取上下文对象（获取画笔）
var cx=canvas.getContext("2d");
//3.设置画笔样式
function clock(){
cx.fillStyle="tomato";
//4.绘制图形
//绘制表盘
cx.beginPath(); //绘制圆形
cx.arc(300,300,200,0,Math.PI*2);//设置圆 arc（x,y,r,begin,end,c）;x,y:圆的圆的圆心坐标 r：圆的半径 begin，end：开始角度和结束角度；Math.PI=180 Math.PI/180=1度 c：是否按照逆时针进行绘制true：按照逆时 false：顺时针
cx.closePath();//关闭路径
cx.fill();//
//绘制时刻度
cx.lineWidth=2;
cx.strokeStyle="black";
for(var i=0;i<12;i++){
cx.save();
cx.translate(300,300);//形移
cx.rotate(i*(Math.PI/6));
cx.beginPath();
cx.moveTo(0,-180);
cx.lineTo(0,-200);
cx.stroke();
cx.closePath();
cx.fillStyle="black";//绘制数字
cx.font="16px blod";
cx.rotate(Math.PI/6);
cx.fillText(i+1,-6,-220);//文字
cx.restore();
}
//绘制分刻度
for(var i=0;i<60;i++){
cx.save();
cx.translate(300,300);
cx.rotate(i*(Math.PI/30));
cx.beginPath();
cx.moveTo(0,-190);
cx.lineTo(0,-200);
cx.stroke();
cx.closePath();
cx.restore();
}
//获取当前时间
var today=new Date();
var hour=today.getHours();
var min=today.getMinutes();
var sec=today.getSeconds();
hour=hour+min/60;
//绘制时针
cx.lineWidth=4;
cx.save();
cx.translate(300,300);
cx.beginPath();
cx.rotate(hour*(Math.PI/6));//旋转
cx.moveTo(0,10);
cx.lineTo(0,-130);
cx.closePath();
cx.stroke();
cx.restore(); //回滚
//绘制分针
cx.lineWidth=2;
cx.save();
cx.translate(300,300);
cx.beginPath();
cx.rotate(min*(Math.PI/30));
cx.moveTo(0,10);
cx.lineTo(0,-160);
cx.closePath();
cx.stroke();
cx.restore(); //回滚
//绘制秒针
cx.lineWidth=1;
cx.strokeStyle="black";
cx.save();
cx.translate(300,300);
cx.beginPath();
cx.rotate(sec*(Math.PI/30));
cx.moveTo(0,10);
cx.lineTo(0,-160);
cx.closePath();
cx.stroke();
cx.restore();
//绘制交叉处
cx.fillStyle='#ccc';
cx.strokeStyle="red";
cx.save();
cx.translate(300,300);
cx.beginPath();
cx.beginPath();
cx.arc(0,0,4,0,Math.PI*2);
cx.closePath();
cx.fill();
cx.closePath();
cx.stroke();
cx.restore();
setTimeout(clock,1000);
}
// setInterval(clock,1000);
clock();
}
</script>
</head>
<body>
<canvas id="canvas" width="1300px" height="600px" style="background-color: #ccc;"></canvas>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持三水点靠木。
javascript canvas实现简易时钟例子
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肥羊7崽声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。
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