canvas Drawing Dial Clock

  • 2021-07-13 04:21:04
  • OfStack

Without saying much, please look at the code:


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>canvas Draw the dial </title>
</head>
<body>
 <canvas id='box' width="500" height="500" >
  Your browser does not support canvas
 </canvas>
 <script>
 var box = document.getElementById('box');
 var cxt = box.getContext('2d');
 //  The clock moves 
 var timer = null;
 function clock(){
 var date = new Date();
 var h = date.getHours();
 h = h + h/60;
 h = h>12? h-12:h;
 var m = date.getMinutes();
 var s = date.getSeconds();
 //  Clear canvas 
 cxt.clearRect(0,0,500,500); 
 //  Draw a dial 
 cxt.strokeStyle = '#f0f';
 cxt.lineWidth = 6;
 cxt.beginPath();
 cxt.arc(250,250,100,0,2*Math.PI);
 cxt.stroke();
 //  Draw a clock scale 
 for(var i=0; i<12; i++){
 cxt.save();
 cxt.translate(250,250);
 cxt.rotate(30*i*Math.PI/180);
 cxt.lineWidth = 3;
 cxt.beginPath();
 cxt.moveTo(0,-80);
 cxt.lineTo(0,-92);
 cxt.stroke();
 cxt.restore();
 }
 // Draw a minute scale 
 for(var i=0; i<60; i++){
 cxt.save();
 cxt.translate(250,250);
 cxt.rotate(6*i*Math.PI/180);
 cxt.lineWidth = 2;
 cxt.beginPath();
 cxt.moveTo(0,-86);
 cxt.lineTo(0,-92);
 cxt.stroke();
 cxt.restore();
 }
 //  Draw an hour hand 
 cxt.save();
 cxt.lineWidth = 5;
 cxt.translate(250,250);
 cxt.rotate(h*30*Math.PI/180);
 cxt.beginPath();
 cxt.moveTo(0,6);
 cxt.lineTo(0,-40);
 cxt.stroke();
 cxt.restore();
 //  Draw a minute hand 
 cxt.save();
 cxt.lineWidth = 3;
 cxt.translate(250,250);
 cxt.rotate(m*6*Math.PI/180);
 cxt.beginPath();
 cxt.moveTo(0,8);
 cxt.lineTo(0,-60);
 cxt.stroke();
 cxt.restore();
 //  Draw a second hand 
 cxt.save();
 cxt.lineWidth = 1;
 cxt.translate(250,250);
 cxt.rotate(s*6*Math.PI/180);
 cxt.beginPath();
 cxt.moveTo(0,10);
 cxt.lineTo(0,-75);
 cxt.stroke();
 cxt.restore();
 //  The small circle in the center of the painting is fixed 3 Root needle 
 cxt.save();
 cxt.beginPath();
 cxt.fillStyle = '#0f0';
 cxt.lineWidth = 2;
 cxt.translate(250,250);
 cxt.arc(0,0,2,0,360,false);
 cxt.stroke();
 cxt.fill();
 cxt.restore();
 //  Draw the garden on the second hand 
 cxt.save();
 cxt.fillStyle = '#f00';
 cxt.lineWidth = 2;
 cxt.translate(250,250);
 cxt.rotate(s*6*Math.PI/180);
 cxt.beginPath();
 cxt.arc(0,-60,2,0,360,false);
 cxt.stroke();
 cxt.fill();
 cxt.restore();
 }
 clock();
 timer = setInterval(clock,1000);
 </script>
</body>
</html>

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