73 lines
2.8 KiB
JavaScript
73 lines
2.8 KiB
JavaScript
(() => {
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const body = document.body;
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// Mobiles Menü
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const burger = document.querySelector('.burger');
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if (burger) {
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burger.addEventListener('click', () => {
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const open = body.classList.toggle('menu-open');
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burger.setAttribute('aria-expanded', open);
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});
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document.querySelectorAll('.nav a').forEach(a =>
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a.addEventListener('click', () => {
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body.classList.remove('menu-open');
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burger.setAttribute('aria-expanded', 'false');
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})
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);
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}
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// Startseite: Header einblenden, sobald der Hero verlassen wird
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const hero = document.querySelector('.hero');
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if (body.classList.contains('is-home') && hero) {
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new IntersectionObserver(([e]) => body.classList.toggle('scrolled', !e.isIntersecting), {
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rootMargin: '-120px 0px 0px 0px'
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}).observe(hero);
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}
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// Ring um das Logo-Siegel: Kreis + die vier Kachel-Lücken, Übergänge mit Radius f abgerundet
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const seal = document.querySelector('.seal');
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const joint = document.querySelector('.seal-joint');
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if (seal && joint) {
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const drawJoint = () => {
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const gap = parseFloat(getComputedStyle(seal.parentElement).columnGap) || 14;
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const h = gap / 2; // halbe Lückenbreite
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const R = seal.offsetWidth / 2 + gap; // Außenradius des Rings
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const f = 18; // Radius der Rundung
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const yd = Math.sqrt((R + f) ** 2 - (h + f) ** 2);
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const k = R / (R + f);
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const L = Math.ceil(R + f + 2); // Arme reichen bis zum Rand der Fläche
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const rot = ([x, y], n) => { for (let i = 0; i < n; i++) [x, y] = [-y, x]; return [x + L, y + L]; };
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const pt = (p, n) => rot(p, n).map(v => v.toFixed(2)).join(' ');
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let d = `M${pt([-(h + f) * k, -yd * k], 0)}`;
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for (let n = 0; n < 4; n++) {
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d += ` A${f} ${f} 0 0 0 ${pt([-h, -yd], n)}`
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+ ` L${pt([-h, -L], n)} L${pt([h, -L], n)} L${pt([h, -yd], n)}`
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+ ` A${f} ${f} 0 0 0 ${pt([(h + f) * k, -yd * k], n)}`
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+ ` A${R} ${R} 0 0 1 ${pt([-(h + f) * k, -yd * k], n + 1)}`;
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}
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joint.setAttribute('width', 2 * L);
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joint.setAttribute('height', 2 * L);
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joint.setAttribute('viewBox', `0 0 ${2 * L} ${2 * L}`);
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joint.firstElementChild.setAttribute('d', d + ' Z');
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};
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drawJoint();
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addEventListener('resize', drawJoint);
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}
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// Elemente beim Scrollen einblenden
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const items = document.querySelectorAll('.reveal');
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if ('IntersectionObserver' in window) {
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const io = new IntersectionObserver(entries => {
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entries.forEach(e => {
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if (e.isIntersecting) {
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e.target.classList.add('in');
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io.unobserve(e.target);
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}
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});
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}, { threshold: 0.12, rootMargin: '0px 0px -40px 0px' });
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items.forEach(el => io.observe(el));
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} else {
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items.forEach(el => el.classList.add('in'));
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}
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})();
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