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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Scroll Abberations</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
display: flex;
flex-direction: row;
flex-wrap: wrap;
align-content: center;
}
.abberation {
position: relative;
flex: 1 0 30%;
margin: 20px;
text-align: center;
}
.abberation img {
max-height: calc(100vh - 100px);
}
.abberation img:first-child {
position: absolute;
}
.abberation:nth-child(2) img {
max-height: 50vh;
}
.abberation:nth-child(3) img {
max-height: 20vh;
}
</style>
</head>
<body>
<section class="abberation">
<img src="autotrace-swirl.svg">
<img src="potrace-swirl.svg">
</section>
<section class="abberation">
<img src="autotrace-swirl.svg">
<img src="potrace-swirl.svg">
</section>
<section class="abberation">
<img src="autotrace-swirl.svg">
<img src="potrace-swirl.svg">
</section>
<script>
document.addEventListener('wheel', function (e) {
var max = 2, min = -2;
document.querySelectorAll('.abberation img:first-child').forEach(function (img) {
var delta = 0;
if (e.deltaY > 0) {
delta = Math.random() * .02;
} else if (e.deltaY < 0) {
delta = -1 * Math.random() * .02;
}
var rot = ('rotation' in img.dataset) ? parseFloat(img.dataset.rotation) + delta : 0;
if (rot > max) { rot = min; }
else if (rot < min) { rot = max; }
img.style.transform = 'rotate('+rot.toString(10)+'deg)';
img.dataset.rotation = rot;
});
});
</script>
</body>
</html>