maxwellbo.github.io/folding_cards.html at master · MaxwellBo/maxwellbo.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Folding Cards</title>
  <script src="https://cdn.tailwindcss.com"></script>
  <style>
    .foldingCardGroup {
      display: flex;
      justify-content: center;
      align-items: center;
      perspective: 400px;
      perspective-origin: center;
      width: var(--reqWidth);
    }

    .foldingCard1,
    .foldingCard2 {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 200px;
      width: 200px;
      background-color: rgba(255, 254, 125, 0.5);
      border: 1px solid rgba(255, 254, 125, 0.5);
      min-width: 200px;
    }

    .foldingCard1 {
      transform: rotateY(var(--negrotation));
      transform-origin: right;
    }

    .foldingCard2 {
      transform: rotateY(var(--rotation));
      transform-origin: left;
    }

    .simple-card {
      background: white;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }
  </style>
  <script type="module">
    import { h, render } from 'https://cdn.skypack.dev/preact';
    import { useState, useEffect, useRef } from 'https://cdn.skypack.dev/preact/hooks';
    import htm from 'https://cdn.skypack.dev/htm';

    const html = htm.bind(h);

    const FoldingCards = ({ dimensions = { width: window.innerWidth, height: window.innerHeight } }) => {
      const [rotation, setRotation] = useState(0);
      const card1Ref = useRef(null);
      const requiredWidthOfCard = dimensions.width / 8;

      useEffect(() => {
        if (card1Ref.current) {
          const width = card1Ref.current.getBoundingClientRect().width;
          if (width - requiredWidthOfCard > 2) {
            setRotation(rotation + 0.1);
          } else if (width - requiredWidthOfCard < -2) {
            setRotation(Math.max(rotation - 0.1, 0));
          }
        }
      }, [card1Ref.current, requiredWidthOfCard, rotation]);

      const cardWidth = card1Ref.current?.getBoundingClientRect().width || 140;

      return html`
        <div class="p-4">
          <div class="flex items-center justify-center"
               style=${{
          '--reqWidth': `${cardWidth * 2}px`,
          '--rotation': `${rotation}deg`,
          '--negrotation': `${-1 * rotation}deg`,
          width: dimensions.width,
          height: dimensions.height,
          backgroundColor: 'rgba(0,0,0,0.5)'
        }}>
            ${Array.from({ length: 3 }).map((_, index) => html`
              <div key=${index} class="foldingCardGroup">
                <div ref=${index === 0 ? card1Ref : null} class="foldingCard1">
                  <div class="simple-card">Card ${5 + index * 2}</div>
                </div>
                <div class="foldingCard2">
                  <div class="simple-card">Card ${1 + index * 2 + 1}</div>
                </div>
              </div>
            `)}
          </div>
        </div>
      `;
    };

    // Render the app
    render(html`<${FoldingCards} />`, document.getElementById('app'));
  </script>
</head>

<body>
  <div id="app"></div>
</body>

</html>