This repository has been archived by the owner on Oct 9, 2019. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 1.9k
/
canvas-grad.html
77 lines (70 loc) · 2.02 KB
/
canvas-grad.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8 />
<title>Canvas Gradient</title>
<style>
body {
background: #000;
}
canvas {
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<canvas height="600" width="600"></canvas>
<script>
var canvas = document.getElementsByTagName('canvas')[0],
ctx = null,
grad = null,
body = document.getElementsByTagName('body')[0],
color = 255;
if (canvas.getContext('2d')) {
ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, 600, 600);
ctx.save();
// Create radial gradient
grad = ctx.createRadialGradient(0,0,0,0,0,600);
grad.addColorStop(0, '#000');
grad.addColorStop(1, 'rgb(' + color + ', ' + color + ', ' + color + ')');
// assign gradients to fill
ctx.fillStyle = grad;
// draw 600x600 fill
ctx.fillRect(0,0,600,600);
ctx.save();
body.onmousemove = function (event) {
var width = window.innerWidth,
height = window.innerHeight,
x = event.clientX,
y = event.clientY,
rx = 600 * x / width,
ry = 600 * y / height;
var xc = ~~(256 * x / width);
var yc = ~~(256 * y / height);
grad = ctx.createRadialGradient(rx, ry, 0, rx, ry, 600);
grad.addColorStop(0, '#000');
grad.addColorStop(1, ['rgb(', xc, ', ', (255 - xc), ', ', yc, ')'].join(''));
// ctx.restore();
ctx.fillStyle = grad;
ctx.fillRect(0,0,600,600);
// ctx.save();
};
}
</script>
<a href="http://github.com/remy/html5demos"><img style="position: absolute; top: 0; left: 0; border: 0;" src="http://s3.amazonaws.com/github/ribbons/forkme_left_darkblue_121621.png" alt="Fork me on GitHub" /></a>
<script>
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script>
try {
var pageTracker = _gat._getTracker("UA-1656750-18");
pageTracker._trackPageview();
} catch(err) {}</script>
</body>
</html>