html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no"/>
<title>canvas clock </title>
<style type ="text/css">
div {
text-align:center;
margin-top:250px;
}
#clock {
border:1px solid #ccc;
}
</style>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no"/>
<title>canvas clock </title>
<style type ="text/css">
div {
text-align:center;
margin-top:250px;
}
#clock {
border:1px solid #ccc;
}
</style>
</head>
<body>
<div>
<canvas id ="clock" height ="200px" width ="200px"></canvas>
</div>
<script type ="text/javascript" src ="clock.js"></script>
</body>
</html>
<div>
<canvas id ="clock" height ="200px" width ="200px"></canvas>
</div>
<script type ="text/javascript" src ="clock.js"></script>
</body>
</html>
js
var dom = document.getElementById('clock');
var ctx = dom.getContext('2d');
var width = ctx.canvas.width;
var height = ctx.canvas.height;
var r = width / 2;
var rem = width / 200;
var ctx = dom.getContext('2d');
var width = ctx.canvas.width;
var height = ctx.canvas.height;
var r = width / 2;
var rem = width / 200;
function drawBackgroud() {
ctx.save();
ctx.translate(r, r);
ctx.beginPath();
ctx.lineWidth = 10*rem;
ctx.arc(0, 0, r - 5 * rem, 0, 2 * Math.PI, false);
ctx.stroke();
var hourNumbers = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2];
ctx.font = 18*rem + 'px Arial';
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
hourNumbers.forEach(function (number, i) {
var rad = 2 * Math.PI / 12 * i;
var x = Math.cos(rad) * (r - 30 * rem);
var y = Math.sin(rad) * (r - 30 * rem);
ctx.fillText(number,x,y);
});
for (var i = 0; i < 60; i++) {
var rad = 2 * Math.PI / 60 * i;
var x = Math.cos(rad) * (r - 18 * rem);
var y = Math.sin(rad) * (r - 18 * rem);
ctx.beginPath();
if (i % 5 === 0) {
ctx.fillStyle = '#000';
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
}
else {
ctx.fillStyle = '#ccc';
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
}
var x = Math.cos(rad) * (r - 30 * rem);
var y = Math.sin(rad) * (r - 30 * rem);
ctx.fillText(number,x,y);
});
for (var i = 0; i < 60; i++) {
var rad = 2 * Math.PI / 60 * i;
var x = Math.cos(rad) * (r - 18 * rem);
var y = Math.sin(rad) * (r - 18 * rem);
ctx.beginPath();
if (i % 5 === 0) {
ctx.fillStyle = '#000';
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
}
else {
ctx.fillStyle = '#ccc';
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
}
ctx.fill();
}
}
function drawHour(hour,minute) {
ctx.save();
ctx.beginPath();
var rad = 2 * Math.PI / 12 * hour;
var mrad = 2 * Math.PI / 12 / 60 * minute;
ctx.rotate(rad + mrad);
ctx.lineWidth = 6 * rem;
ctx.lineCap = 'round';
ctx.moveTo(0, 10);
ctx.lineTo(0, -r / 2);
ctx.stroke();
ctx.restore();
}
}
}
function drawHour(hour,minute) {
ctx.save();
ctx.beginPath();
var rad = 2 * Math.PI / 12 * hour;
var mrad = 2 * Math.PI / 12 / 60 * minute;
ctx.rotate(rad + mrad);
ctx.lineWidth = 6 * rem;
ctx.lineCap = 'round';
ctx.moveTo(0, 10);
ctx.lineTo(0, -r / 2);
ctx.stroke();
ctx.restore();
}
function drawMinute(minute) {
ctx.save();
ctx.beginPath();
var rad = 2 * Math.PI / 60 * minute;
ctx.rotate(rad);
ctx.lineWidth = 3 * rem;
ctx.lineCap = 'round';
ctx.moveTo(0, 10 * rem);
ctx.lineTo(0, -r + 30 * rem);
ctx.stroke();
ctx.restore();
}
ctx.save();
ctx.beginPath();
var rad = 2 * Math.PI / 60 * minute;
ctx.rotate(rad);
ctx.lineWidth = 3 * rem;
ctx.lineCap = 'round';
ctx.moveTo(0, 10 * rem);
ctx.lineTo(0, -r + 30 * rem);
ctx.stroke();
ctx.restore();
}
function drawSecond(second) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = '#c14543';
var rad = 2 * Math.PI / 60 * second;
ctx.rotate(rad);
ctx.moveTo(-2 * rem, 20 * rem);
ctx.lineTo(2 * rem, 20 * rem);
ctx.lineTo(1 * rem, -r + 18 * rem);
ctx.lineTo(-1 * rem, -r + 18 * rem);
ctx.fill();
ctx.restore();
}
function drawDot() {
ctx.beginPath();
ctx.fillStyle = '#fff';
ctx.arc(0, 0, 3 * rem, 0, 2 * Math.PI, false);
ctx.fill();
ctx.save();
ctx.beginPath();
ctx.fillStyle = '#c14543';
var rad = 2 * Math.PI / 60 * second;
ctx.rotate(rad);
ctx.moveTo(-2 * rem, 20 * rem);
ctx.lineTo(2 * rem, 20 * rem);
ctx.lineTo(1 * rem, -r + 18 * rem);
ctx.lineTo(-1 * rem, -r + 18 * rem);
ctx.fill();
ctx.restore();
}
function drawDot() {
ctx.beginPath();
ctx.fillStyle = '#fff';
ctx.arc(0, 0, 3 * rem, 0, 2 * Math.PI, false);
ctx.fill();
}
function draw() {
ctx.clearRect(0,0,width,height);
var now = new Date();
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
drawBackgroud();
drawHour(hour, minute);
drawMinute(minute);
drawSecond(second);
drawDot();
ctx.restore();
}
setInterval(draw, 1000);