JS+Canvas绘制时钟效果

来源：动视网责编：小OO 时间：2020-11-27 20:25:31

JS+Canvas绘制时钟效果

1.clock.html。<；，canvas.height/2)；//初始化画布 context.save()；context.clearRect(0，0，canvas.width，canvas.height)；context.translate(canvas.width/2，0)；context.lineTo(radius-10，0)；} context.stroke()；context.restore()；context.save()；//分钟刻度 context.lineWidth=2；context.beginPath()；for(var i=0；i<；60；i++){ if(。i%5==0){ context.moveTo(radius-15，0，0。

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导读1.clock.html。<；，canvas.height/2)；//初始化画布 context.save()；context.clearRect(0，0，canvas.width，canvas.height)；context.translate(canvas.width/2，0)；context.lineTo(radius-10，0)；} context.stroke()；context.restore()；context.save()；//分钟刻度 context.lineWidth=2；context.beginPath()；for(var i=0；i<；60；i++){ if(。i%5==0){ context.moveTo(radius-15，0，0。

本文实例为大家分享了使用canvas绘制时钟的具体代码，供大家参考，具体内容如下

1. clock.html

<!doctype html>
<html>
 <head>
 <meta charset="UTF-8">
 <meta name="Description" content="">
 <title>canvas时钟</title>
 </head>
 <body>
 <canvas id="canvas" width="300" height="300"></canvas>
 <script>
 var canvas=document.getElementById("canvas");
 var context=canvas.getContext('2d');
 //draw();
 function draw(){
 //得到当前系统的时分秒
 var now=new Date();
 var sec=now.getSeconds();
 var min=now.getMinutes();
 var hour=now.getHours();
 hour>=12&&(hour=hour-12);
 
 
 var radius = Math.min(canvas.width/2,canvas.height/2);
 //初始化画布
 context.save();
 context.clearRect(0,0,canvas.width,canvas.height);
 context.translate(canvas.width/2,canvas.height/2); 
 context.rotate(-Math.PI/2);
 context.save();
 
 //表框
 
 
 //小时刻度
 context.strokeStyle="black";
 context.fillStyle="black";
 context.lineWidth=3;
 context.lineCap="round";
 context.beginPath();
 for(var i=0;i<12;i++){
 context.rotate(Math.PI/6);
 context.moveTo(radius-30,0);
 context.lineTo(radius-10,0);
 
 }
 context.stroke();
 context.restore();
 context.save();
 
 //分钟刻度
 context.lineWidth=2;
 context.beginPath();
 for(var i=0;i<60;i++){
 if(!i%5==0){
 context.moveTo(radius-15,0);
 context.lineTo(radius-10,0);
 }
 context.rotate(Math.PI/30);
 }
 context.stroke();
 context.restore();
 context.save();
 
 //画上时针
 
 context.rotate((Math.PI/6)*hour+(Math.PI/360)*min+(Math.PI/21600)*sec);
 context.lineWidth=6;
 context.beginPath();
 context.moveTo(-10,0);
 context.lineTo(radius*0.5,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.rotate((Math.PI/30)*min+(Math.PI/1800)*sec);
 context.strokeStyle="#29A8DE";
 context.lineWidth=4;
 context.lineCap="butt";
 context.beginPath();
 context.moveTo(-20,0);
 context.lineTo(radius*0.7,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.rotate(sec*Math.PI/30);
 context.strokeStyle="red";
 context.lineWidth=2;
 context.lineCap="butt";
 context.beginPath();
 context.moveTo(-30,0);
 context.lineTo(radius*0.9,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.lineWidth=4;
 context.strokeStyle="gray";
 context.beginPath();
 context.arc(0,0,radius,0,Math.PI*2,true);
 context.stroke();
 context.restore();
 
 
 context.restore();
 }
 
 window.onload=function(){
 setInterval(draw,1000)
 }
 </script>
 </body>
</html>

2. JavaScript代码

<script>
 var canvas=document.getElementById("canvas");
 var context=canvas.getContext('2d');
 //draw();
 function draw(){
 //得到当前系统的时分秒
 var now=new Date();
 var sec=now.getSeconds();
 var min=now.getMinutes();
 var hour=now.getHours();
 hour>=12&&(hour=hour-12);
 
 
 var radius = Math.min(canvas.width/2,canvas.height/2);
 //初始化画布
 context.save();
 context.clearRect(0,0,canvas.width,canvas.height);
 context.translate(canvas.width/2,canvas.height/2); 
 context.rotate(-Math.PI/2);
 context.save();
 
 //表框
 
 
 //小时刻度
 context.strokeStyle="black";
 context.fillStyle="black";
 context.lineWidth=3;
 context.lineCap="round";
 context.beginPath();
 for(var i=0;i<12;i++){
 context.rotate(Math.PI/6);
 context.moveTo(radius-30,0);
 context.lineTo(radius-10,0);
 
 }
 context.stroke();
 context.restore();
 context.save();
 
 //分钟刻度
 context.lineWidth=2;
 context.beginPath();
 for(var i=0;i<60;i++){
 if(!i%5==0){
 context.moveTo(radius-15,0);
 context.lineTo(radius-10,0);
 }
 context.rotate(Math.PI/30);
 }
 context.stroke();
 context.restore();
 context.save();
 
 //画上时针
 
 context.rotate((Math.PI/6)*hour+(Math.PI/360)*min+(Math.PI/21600)*sec);
 context.lineWidth=6;
 context.beginPath();
 context.moveTo(-10,0);
 context.lineTo(radius*0.5,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.rotate((Math.PI/30)*min+(Math.PI/1800)*sec);
 context.strokeStyle="#29A8DE";
 context.lineWidth=4;
 context.lineCap="butt";
 context.beginPath();
 context.moveTo(-20,0);
 context.lineTo(radius*0.7,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.rotate(sec*Math.PI/30);
 context.strokeStyle="red";
 context.lineWidth=2;
 context.lineCap="butt";
 context.beginPath();
 context.moveTo(-30,0);
 context.lineTo(radius*0.9,0);
 context.stroke();
 context.restore();
 context.save();
 
 context.lineWidth=4;
 context.strokeStyle="gray";
 context.beginPath();
 context.arc(0,0,radius,0,Math.PI*2,true);
 context.stroke();
 context.restore();
 
 
 context.restore();
 }
 
 window.onload=function(){
 setInterval(draw,1000)
 }
 </script>

JS+Canvas绘制时钟效果

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标签： js 时钟绘制

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