eb01e75a3f
The pins were drifting east of the actual cities — Paris ended up over Italy and Antananarivo in the Indian Ocean. Linear regression over five calibration frames (visible central longitude at t=0,10,15,18,22) gives LON0~151, rate~-6.0, which I round to 150 and -6. Also expose all knobs as URL params (?lon0=&rate=&cx=&cy=&r=) and add a ?debug=1 overlay that draws the projected sphere outline + equator + 30 deg meridian grid, so the calibration can be eyeballed live. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
313 lines
13 KiB
HTML
313 lines
13 KiB
HTML
<!DOCTYPE html>
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<html lang="fr">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>MVA Global Fret — Bienvenue</title>
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<meta name="description" content="MVA Global Fret — Le pont aérien entre Paris et Antananarivo.">
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<link rel="icon" type="image/png" href="PNG MVA GLOBAL FRET.png">
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<link rel="preconnect" href="https://fonts.googleapis.com">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Poppins:wght@600;700;800&display=swap" rel="stylesheet">
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css">
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<link rel="stylesheet" href="css/parallax.css">
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</head>
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<body class="parallax-body">
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<header class="parallax-header">
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<div class="parallax-logo" aria-label="MVA Global Fret">
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<img src="PNG MVA GLOBAL FRET.png" alt="MVA Global Fret">
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<span>MVA Global Fret</span>
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</div>
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<div class="lang-switcher" role="group" aria-label="Choisir la langue">
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<button data-lang="fr" class="active">FR</button>
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<button data-lang="en">EN</button>
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<button data-lang="mg">MG</button>
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</div>
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</header>
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<main class="stage">
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<video class="layer layer-video" id="earthVideo"
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autoplay loop muted playsinline preload="auto"
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poster="videos/earth-poster.jpg">
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<source src="videos/earth-rotation.mp4" type="video/mp4">
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</video>
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<div class="layer layer-tint"></div>
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<svg class="layer layer-route" id="routeSvg"
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viewBox="0 0 1280 720" preserveAspectRatio="xMidYMid slice"
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xmlns="http://www.w3.org/2000/svg">
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<defs>
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<filter id="redGlow" x="-50%" y="-50%" width="200%" height="200%">
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<feGaussianBlur stdDeviation="6" result="blur"/>
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<feMerge>
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<feMergeNode in="blur"/>
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<feMergeNode in="SourceGraphic"/>
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</feMerge>
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</filter>
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<linearGradient id="redLine" x1="0%" y1="0%" x2="100%" y2="100%">
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<stop offset="0%" stop-color="#ff5b6e" stop-opacity="0.7"/>
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<stop offset="50%" stop-color="#ff2a3d" stop-opacity="1"/>
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<stop offset="100%" stop-color="#ff5b6e" stop-opacity="0.7"/>
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</linearGradient>
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</defs>
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<g id="debugLayer" style="display:none">
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<circle id="dbgEarth" r="0" cx="0" cy="0" fill="none" stroke="#00e5ff" stroke-width="1.5" opacity="0.7"/>
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<path id="dbgEquator" d="" stroke="#ffea00" stroke-width="1" fill="none" opacity="0.7" stroke-dasharray="4 4"/>
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<g id="dbgGrid"></g>
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<text id="dbgLabel" x="20" y="40" fill="#00e5ff" font-family="monospace" font-size="18" font-weight="700"></text>
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</g>
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<g id="routeGroup" opacity="0">
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<path id="routeHalo" d="" stroke="#ff2a3d" stroke-width="9" fill="none" opacity="0.3" filter="url(#redGlow)"/>
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<path id="routeLine" d="" stroke="url(#redLine)" stroke-width="2" fill="none" stroke-linecap="round" filter="url(#redGlow)"/>
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<circle id="pulseDot" r="4" fill="#fff" filter="url(#redGlow)"/>
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<g id="pinParis">
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<circle r="10" fill="#ff2a3d" opacity="0.18"/>
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<circle r="5" fill="#ff2a3d" opacity="0.55" filter="url(#redGlow)"/>
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<circle r="2.5" fill="#fff"/>
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</g>
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<g id="pinTana">
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<circle r="10" fill="#ff2a3d" opacity="0.18"/>
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<circle r="5" fill="#ff2a3d" opacity="0.55" filter="url(#redGlow)"/>
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<circle r="2.5" fill="#fff"/>
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</g>
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</g>
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</svg>
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<a href="accueil.html" class="cta-btn">
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<span class="cta-btn-shine"></span>
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<span data-i18n="intro.ctaBtn">Accéder au site</span>
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<i class="fa-solid fa-arrow-right"></i>
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</a>
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</main>
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<script src="js/translations.js"></script>
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<script>
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/* i18n minimal ------------------------------------------------------- */
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(function () {
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const lang = localStorage.getItem('mva-lang') || 'fr';
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applyLang(lang);
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document.querySelectorAll('.lang-switcher button').forEach(btn => {
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btn.addEventListener('click', () => applyLang(btn.dataset.lang));
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});
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function applyLang(l) {
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document.documentElement.lang = l;
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localStorage.setItem('mva-lang', l);
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document.querySelectorAll('.lang-switcher button').forEach(b =>
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b.classList.toggle('active', b.dataset.lang === l)
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);
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const t = window.translations?.[l];
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if (!t) return;
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document.querySelectorAll('[data-i18n]').forEach(el => {
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const keys = el.dataset.i18n.split('.');
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let v = t;
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for (const k of keys) v = v?.[k];
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if (v != null) el.textContent = v;
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});
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}
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})();
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/* Ligne rouge 3D synchronisée à la rotation de la Terre --------------
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Calibration empirique sur la vidéo earth-rotation.mp4 :
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- Centre de la Terre dans le frame 1280×720 : (640, 360)
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- Rayon visible : 340 px
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- Longitude centrale à t=0 : 150°E
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- Vitesse de rotation : -6°/s (apparent)
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Override en URL : ?lon0=150&rate=-6&debug=1
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-------------------------------------------------------------------- */
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(function () {
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const params = new URLSearchParams(location.search);
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const EARTH_CX = +params.get('cx') || 640;
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const EARTH_CY = +params.get('cy') || 360;
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const EARTH_R = +params.get('r') || 340;
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const LON0 = parseFloat(params.get('lon0') ?? '150');
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const ROT_RATE = parseFloat(params.get('rate') ?? '-6');
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const DEBUG = params.has('debug');
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const PARIS = { lat: 48.85, lon: 2.35 };
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const TANA = { lat: -18.9, lon: 47.5 };
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const video = document.getElementById('earthVideo');
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const routeGroup = document.getElementById('routeGroup');
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const halo = document.getElementById('routeHalo');
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const line = document.getElementById('routeLine');
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const pulseDot = document.getElementById('pulseDot');
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const pinParis = document.getElementById('pinParis');
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const pinTana = document.getElementById('pinTana');
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const DEG = Math.PI / 180;
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// 3D unit-sphere vector (y axis = north pole, rotation around y)
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function toCart(latDeg, lonDeg) {
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const la = latDeg * DEG, lo = lonDeg * DEG;
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return [Math.cos(la) * Math.sin(lo),
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Math.sin(la),
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Math.cos(la) * Math.cos(lo)];
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}
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function rotateY(v, angDeg) {
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const a = angDeg * DEG, c = Math.cos(a), s = Math.sin(a);
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return [v[0]*c + v[2]*s, v[1], -v[0]*s + v[2]*c];
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}
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function project(v) {
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return {
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x: EARTH_CX + v[0] * EARTH_R,
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y: EARTH_CY - v[1] * EARTH_R,
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z: v[2] // > 0 = front side
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};
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}
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// Slerp on great circle
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function slerp(a, b, t) {
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const dot = Math.max(-1, Math.min(1, a[0]*b[0] + a[1]*b[1] + a[2]*b[2]));
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const omega = Math.acos(dot);
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if (omega < 1e-6) return [a[0], a[1], a[2]];
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const s = Math.sin(omega);
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const c1 = Math.sin((1 - t) * omega) / s;
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const c2 = Math.sin(t * omega) / s;
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return [a[0]*c1 + b[0]*c2, a[1]*c1 + b[1]*c2, a[2]*c1 + b[2]*c2];
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}
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const parisVec = toCart(PARIS.lat, PARIS.lon);
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const tanaVec = toCart(TANA.lat, TANA.lon);
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// Pre-compute great-circle samples in original (unrotated) space
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const SAMPLES = 60;
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const arcVecs = [];
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for (let i = 0; i <= SAMPLES; i++) arcVecs.push(slerp(parisVec, tanaVec, i / SAMPLES));
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// Debug overlay : projected sphere outline + equator + longitude grid
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const dbgLayer = document.getElementById('debugLayer');
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const dbgEarth = document.getElementById('dbgEarth');
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const dbgEquator = document.getElementById('dbgEquator');
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const dbgGrid = document.getElementById('dbgGrid');
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const dbgLabel = document.getElementById('dbgLabel');
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if (DEBUG) {
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dbgLayer.style.display = '';
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dbgEarth.setAttribute('cx', EARTH_CX);
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dbgEarth.setAttribute('cy', EARTH_CY);
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dbgEarth.setAttribute('r', EARTH_R);
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}
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function buildArcPath(vecs, rotAngle) {
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let d = '', open = false;
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for (const v of vecs) {
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const p = project(rotateY(v, rotAngle));
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if (p.z > 0) {
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d += (open ? ' L ' : 'M ') + p.x.toFixed(1) + ' ' + p.y.toFixed(1);
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open = true;
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} else { open = false; }
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}
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return d;
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}
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// Pre-compute equator + meridians (every 30°)
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const eqVecs = [];
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for (let i = 0; i <= 180; i++) eqVecs.push(toCart(0, i * 2 - 180));
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const meridianSets = [];
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for (let lon = -180; lon < 180; lon += 30) {
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const set = [];
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for (let lat = -90; lat <= 90; lat += 5) set.push(toCart(lat, lon));
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meridianSets.push(set);
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if (DEBUG) {
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const p = document.createElementNS('http://www.w3.org/2000/svg', 'path');
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p.setAttribute('stroke', '#ffea00');
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p.setAttribute('stroke-width', '0.6');
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p.setAttribute('fill', 'none');
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p.setAttribute('opacity', '0.5');
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p.setAttribute('stroke-dasharray', '3 3');
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p.dataset.lon = lon;
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dbgGrid.appendChild(p);
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}
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}
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function update() {
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// Time source : video.currentTime (loops automatically). Fallback : Date.now()
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const t = (video && !isNaN(video.currentTime)) ? video.currentTime : (performance.now() / 1000);
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// We rotate the world by -(LON0 + ROT_RATE * t) so that the visible
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// central longitude at time t equals (LON0 + ROT_RATE * t).
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const rotAngle = -(LON0 + ROT_RATE * t);
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const pPar = project(rotateY(parisVec, rotAngle));
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const pTan = project(rotateY(tanaVec, rotAngle));
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// Build the visible portion of the arc
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let pathD = '';
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let allPoints = [];
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let visibleCount = 0;
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for (const v of arcVecs) {
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const p = project(rotateY(v, rotAngle));
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allPoints.push(p);
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if (p.z > 0) visibleCount++;
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}
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if (visibleCount === arcVecs.length) {
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// Fully visible → smooth single path
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pathD = 'M ' + allPoints[0].x.toFixed(1) + ' ' + allPoints[0].y.toFixed(1);
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for (let i = 1; i < allPoints.length; i++) {
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pathD += ' L ' + allPoints[i].x.toFixed(1) + ' ' + allPoints[i].y.toFixed(1);
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}
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} else {
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// Partial → only emit the consecutive visible run(s)
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let segOpen = false;
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for (let i = 0; i < allPoints.length; i++) {
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const p = allPoints[i];
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if (p.z > 0) {
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if (!segOpen) {
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pathD += (pathD ? ' M ' : 'M ') + p.x.toFixed(1) + ' ' + p.y.toFixed(1);
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segOpen = true;
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} else {
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pathD += ' L ' + p.x.toFixed(1) + ' ' + p.y.toFixed(1);
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}
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} else {
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segOpen = false;
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}
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}
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}
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line.setAttribute('d', pathD);
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halo.setAttribute('d', pathD);
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// Pin positions + visibility
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pinParis.setAttribute('transform', 'translate(' + pPar.x.toFixed(1) + ' ' + pPar.y.toFixed(1) + ')');
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pinTana .setAttribute('transform', 'translate(' + pTan.x.toFixed(1) + ' ' + pTan.y.toFixed(1) + ')');
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pinParis.style.opacity = pPar.z > 0 ? 1 : 0;
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pinTana .style.opacity = pTan.z > 0 ? 1 : 0;
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// Pulse dot — travels Paris → Tana along visible portion in 3.6s loops
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const pulseT = (t / 3.6) % 1;
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let idx = Math.floor(pulseT * SAMPLES);
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if (idx > SAMPLES) idx = SAMPLES;
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const pPulse = allPoints[idx];
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if (pPulse && pPulse.z > 0) {
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pulseDot.setAttribute('cx', pPulse.x.toFixed(1));
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pulseDot.setAttribute('cy', pPulse.y.toFixed(1));
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pulseDot.style.opacity = Math.min(1, pPulse.z * 2);
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} else {
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pulseDot.style.opacity = 0;
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}
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// Debug overlay update
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if (DEBUG) {
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dbgEquator.setAttribute('d', buildArcPath(eqVecs, rotAngle));
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const meridianPaths = dbgGrid.children;
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for (let i = 0; i < meridianPaths.length; i++) {
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meridianPaths[i].setAttribute('d', buildArcPath(meridianSets[i], rotAngle));
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}
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const central = ((LON0 + ROT_RATE * t) % 360 + 540) % 360 - 180;
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dbgLabel.textContent = 't=' + t.toFixed(1) + 's central=' + central.toFixed(1) + '° rate=' + ROT_RATE + '°/s lon0=' + LON0;
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}
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// Group opacity = fade out when both pins are on the back side
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const visFactor = Math.max(0, Math.min(1, (Math.max(pPar.z, pTan.z) + 0.05) * 4));
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routeGroup.setAttribute('opacity', visFactor.toFixed(2));
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requestAnimationFrame(update);
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}
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requestAnimationFrame(update);
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})();
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</script>
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</body>
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</html>
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