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index.swirl-superslow.html 1.74 KiB
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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>