<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="clock.css">
<title>Analogue Clock</title>
</head>
<body>
<canvas id="canvas" width="600" height="600"></canvas>
<script src="clock.js"></script>
<h1>Codingthai.com</h1>
</body>
body{
background-color: skyblue;
}
#canvas{
margin-left: 300px;
margin-top: 50px;
}
h1{
color: blue;
margin-left: 550px;
}
//create a canvas object fro HTML element
var canvas = document.getElementById('canvas');
//create a 2d drawing object
var ctx = canvas.getContext('2d');
//calculate the clock radius by using the height
var radius = canvas.height / 2;
//remap the x and y axis to the center of the canvas
ctx.translate(radius, radius);
//reduce clock radius by 90%
radius = radius * 0.90;
setInterval(drawClock, 1000); //run the drawClock function every second.
function drawClock(){
drawFace(ctx, radius);
drawNumbers(ctx, radius);
drawTime(ctx, radius);
}
function drawFace(ctx, radius){
var grad;
//draw white circle for the face
ctx.beginPath();
ctx.arc(0,0,radius,0,2*Math.PI);
ctx.fillStyle = "White";
ctx.fill();
// create a radial gradient (inner, middle, and outer edge of clock)
grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');
//define gradient as stroke style
ctx.strokeStyle = grad;
ctx.lineWidth = radius*0.1;
ctx.stroke();
//draw the center of the clock
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"; //set font at 15% of radius
ctx.textBaseline = "middle"; //set text alignment to middle
ctx.textAlign = "center"; //set text alignment to center
for(num=1; num < 13; num++){ //calculate the print position for each number
ang = num *Math.PI /6;
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();
//hour
hour = hour%12;
//calculate angle of hour hand
hour = (hour*Math.PI/6)+(minute*Math.PI/(6*60))+(second*Math.PI/(360*60));
//make hour hand 50% of canvas's radius
drawHand(ctx, hour, radius*0.5, radius*0.07);
//minute
//calculate angle of minute hand
minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
//make minute hand 80% of canvas's radius
drawHand(ctx, minute, radius*0.8, radius*0.07);
//second
//calculate angle of second hand
second=(second*Math.PI/30);
//make second hand 90% of canvas's radius
drawHand(ctx, second, radius*0.9, radius*0.02);
}
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);
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.