HTML5 Clocks

For our new lesson I have prepared nice pure HTML5 clocks. This is pretty easy script, but it is very easy and impressive (as usual). Of course – anything necessary will be at canvas object.

Here are our demo and downloadable package:

Live Demo
download in package

Ok, download the source files and lets start coding !


Step 1. HTML

This is markup of our clocks. Here it is.

index.html

01 <!DOCTYPE html>
02 <html lang="en" >
03     <head>
04         <meta charset="utf-8" />
05         <title>HTML5 Clocks | Script Tutorials</title>
06         <link href="css/main.css" rel="stylesheet" type="text/css" />
07         <script src="http://code.jquery.com/jquery-latest.min.js"></script>
08         <script src="js/script.js"></script>
09     </head>
10     <body>
11         <header>
12             <h2>HTML5 Clocks</h2>
13             <a href="http://www.script-tutorials.com/html5-clocks/" class="stuts">Back to original tutorial on <span>Script Tutorials</span></a>
14         </header>
15         <div class="clocks">
16             <canvas id="canvas" width="500" height="500"></canvas>
17         </div>
18     </body>
19 </html>

Step 2. CSS

Here are all required stylesheets

css/main.css

1 .clocks {
2     height500px;
3     margin25px auto;
4     positionrelative;
5     width500px;
6 }

Step 3. JS

js/script.js

01 // inner variables
02 var canvas, ctx;
03 var clockRadius = 250;
04 var clockImage;
05
06 // draw functions :
07 function clear() { // clear canvas function
08     ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
09 }
10
11 function drawScene() { // main drawScene function
12     clear(); // clear canvas
13
14     // get current time
15     var date = new Date();
16     var hours = date.getHours();
17     var minutes = date.getMinutes();
18     var seconds = date.getSeconds();
19     hours = hours > 12 ? hours - 12 : hours;
20     var hour = hours + minutes / 60;
21     var minute = minutes + seconds / 60;
22
23     // save current context
24     ctx.save();
25
26     // draw clock image (as background)
27     ctx.drawImage(clockImage, 0, 0, 500, 500);
28
29     ctx.translate(canvas.width / 2, canvas.height / 2);
30     ctx.beginPath();
31
32     // draw numbers
33     ctx.font = '36px Arial';
34     ctx.fillStyle = '#000';
35     ctx.textAlign = 'center';
36     ctx.textBaseline = 'middle';
37     for (var n = 1; n <= 12; n++) {
38         var theta = (n - 3) * (Math.PI * 2) / 12;
39         var x = clockRadius * 0.7 * Math.cos(theta);
40         var y = clockRadius * 0.7 * Math.sin(theta);
41         ctx.fillText(n, x, y);
42     }
43
44     // draw hour
45     ctx.save();
46     var theta = (hour - 3) * 2 * Math.PI / 12;
47     ctx.rotate(theta);
48     ctx.beginPath();
49     ctx.moveTo(-15, -5);
50     ctx.lineTo(-15, 5);
51     ctx.lineTo(clockRadius * 0.5, 1);
52     ctx.lineTo(clockRadius * 0.5, -1);
53     ctx.fill();
54     ctx.restore();
55
56     // draw minute
57     ctx.save();
58     var theta = (minute - 15) * 2 * Math.PI / 60;
59     ctx.rotate(theta);
60     ctx.beginPath();
61     ctx.moveTo(-15, -4);
62     ctx.lineTo(-15, 4);
63     ctx.lineTo(clockRadius * 0.8, 1);
64     ctx.lineTo(clockRadius * 0.8, -1);
65     ctx.fill();
66     ctx.restore();
67
68     // draw second
69     ctx.save();
70     var theta = (seconds - 15) * 2 * Math.PI / 60;
71     ctx.rotate(theta);
72     ctx.beginPath();
73     ctx.moveTo(-15, -3);
74     ctx.lineTo(-15, 3);
75     ctx.lineTo(clockRadius * 0.9, 1);
76     ctx.lineTo(clockRadius * 0.9, -1);
77     ctx.fillStyle = '#0f0';
78     ctx.fill();
79     ctx.restore();
80
81     ctx.restore();
82 }
83
84 // initialization
85 $(function(){
86     canvas = document.getElementById('canvas');
87     ctx = canvas.getContext('2d');
88
89     // var width = canvas.width;
90     // var height = canvas.height;
91
92 clockImage = new Image();
93 clockImage.src = 'images/cface.png';
94
95     setInterval(drawScene, 1000); // loop drawScene
96 });

I have defined main timer to redraw scene. Each step (tick) script defines current time, and draw clock arrows (hour arrow, minute arrow and second arrow).


Live Demo
download in package

Conclusion

Hope that today’s html5 clocks was impressive for you as always. We have made another one nice html5 tutorial. I will be glad to see your thanks and comments. Good luck!