/
analog-clocks.html
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/
analog-clocks.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="generator" content="HTML Tidy, see www.w3.org">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/style2.css">
<title>Local and UTC clocks</title>
<style type="text/css">
div.c1 {margin-left: 2em}
div.c2 {text-align: center}
h1.c1 {text-align: center}
table.c1 {}
</style>
</head>
<body>
<h1 class="c1">Analog</h1>
<div class="c2">
<script async defer id='201772115915641' src='http://widgets.worldtimeserver.com/Public.ashx?rid=201772115915641&theme=Analog&action=clock24&wtsid=UTC&hex=000183&city=UTC&size=small'></script>
</div>
<hr>
<div class="c2">
<canvas id="canvas" width="200" height="200" style="background-color:#B0C4DE"></canvas>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var radius = canvas.height / 2;
ctx.translate(radius, radius);
radius = radius * 0.9;
setInterval(drawClock, 1000);
function drawClock() {
drawFace(ctx, radius);
drawNumbers(ctx, radius);
drawTime(ctx, radius);
}
function drawFace(ctx, radius) {
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2 * Math.PI);
ctx.fillStyle = "white";
ctx.fill();
grad = ctx.createRadialGradient(0, 0, radius * 0.95, 0, 0, radius * 1.05);
grad.addColorStop(0, "#333");
grad.addColorStop(0.5, "blue");
grad.addColorStop(1, "#333");
ctx.strokeStyle = grad;
ctx.lineWidth = radius * 0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius * 0.1, 0, 2 * Math.PI);
ctx.fillStyle = "#333";
ctx.fill();
}
function drawNumbers(ctx, radius) {
var ang;
var num;
ctx.font = radius * 0.15 + "px arial";
ctx.textBaseline = "middle";
ctx.textAlign = "center";
for (num = 1; num < 25; num++) {
ang = num * Math.PI / 12;
ctx.rotate(ang);
ctx.translate(0, -radius * 0.85);
ctx.rotate(-ang);
ctx.fillText(num.toString(), 0, 0);
ctx.rotate(ang);
ctx.translate(0, radius * 0.85);
ctx.rotate(-ang);
}
}
function drawTime(ctx, radius) {
var now = new Date();
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
var offset = now.getTimezoneOffset();
//hour
hour = (hour + (offset/60)) % 24; // covert to UTC/GMT
hour =
hour * Math.PI / 12 +
minute * Math.PI / (12 * 60) +
second * Math.PI / (360 * 60);
drawHand(ctx, hour, radius * 0.5, radius * 0.07);
//minute
minute = minute * Math.PI / 30 + second * Math.PI / (30 * 60);
drawHand(ctx, minute, radius * 0.8, radius * 0.07);
// second
ctx.strokeStyle = "red";
second = second * Math.PI / 30;
drawHand(ctx, second, radius * 0.9, radius * 0.02);
ctx.strokeStyle = "#333";
}
function drawHand(ctx, pos, length, width) {
ctx.beginPath();
ctx.lineWidth = width;
ctx.lineCap = "round";
ctx.moveTo(0, 0);
ctx.rotate(pos);
ctx.lineTo(0, -length);
ctx.stroke();
ctx.rotate(-pos);
}
</script>
</div>
<hr>
Revised: Wednesday, July 26, 2017 at 11:44:41 AM (EDT)
</body>
</html>