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goshuin.html
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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>Virtual Goshuin (御朱印)</title>
<style>
.goshuin-book {
display: flex;
perspective: 1000px;
transform-style: preserve-3d;
}
.goshuin-page {
height: 300px;
background: white;
border: 1px solid #ddd;
transform-origin: left center;
transform-style: preserve-3d;
max-width: 200px;
}
.goshuin-page img {
width: 100%;
height: 100%;
object-fit: cover;
}
</style>
</head>
<body>
<div class="goshuin-book">
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+1" alt="Goshuin page 1">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+2" alt="Goshuin page 2">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+3" alt="Goshuin page 3">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+4" alt="Goshuin page 4">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+5" alt="Goshuin page 5">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+6" alt="Goshuin page 6">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+7" alt="Goshuin page 7">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+8" alt="Goshuin page 8">
</div>
<div class="goshuin-page">
<img src="https://placehold.co/200x300/e4e4e4/666666?text=Goshuin+9" alt="Goshuin page 9">
</div>
</div>
<script>
const maxWidth = 200; // Maximum width of a single page
const minAngle = 2; // Minimum rotation when fully expanded
const maxAngle = 45; // Maximum rotation when fully compressed
function updateRotations() {
const pages = document.querySelectorAll('.goshuin-page');
const firstPage = pages[0];
const currentWidth = firstPage.offsetWidth;
// Calculate rotation angle based on current width
// As width decreases from maxWidth to smaller values, angle increases
const ratio = Math.min(Math.max(currentWidth / maxWidth, 0.2), 1);
const baseAngle = (1 - ratio) * (maxAngle - minAngle) + minAngle;
pages.forEach((page, index) => {
// Alternate between positive and negative angles
const direction = index % 2 === 0 ? 1 : -1;
page.style.transform = `rotateY(${baseAngle * direction}deg)`;
});
}
// Update rotations on load and resize
window.addEventListener('load', updateRotations);
window.addEventListener('resize', updateRotations);
// Create a ResizeObserver to watch for container width changes
const observer = new ResizeObserver(updateRotations);
observer.observe(document.querySelector('.goshuin-book'));
</script>
</body>
</html>