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feat: Add animated satellite/signal background to GitHub Pages

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Canvas-based animation with orbiting satellite dots, signal pulse rings,
drifting particles, and a faint grid overlay. Uses the accent cyan color
at very low opacity to stay subtle. Particles brighten near the cursor.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-16 22:58:09 +00:00
parent 5e2fb4c2d2
commit 08fe224cb3
2 changed files with 243 additions and 0 deletions
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docs/index.html
+227
View File
@@ -11,6 +11,7 @@
<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet"> <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
</head> </head>
<body> <body>
<canvas id="bg-canvas"></canvas>
<nav class="navbar"> <nav class="navbar">
<div class="nav-container"> <div class="nav-container">
<a href="#" class="nav-logo">iNTERCEPT</a> <a href="#" class="nav-logo">iNTERCEPT</a>
@@ -492,5 +493,231 @@ docker compose up -d</code></pre>
window.addEventListener('resize', () => { buildIndicators(); updateArrows(); }); window.addEventListener('resize', () => { buildIndicators(); updateArrows(); });
})(); })();
</script> </script>
<script>
// Animated satellite & signal background
(function() {
const canvas = document.getElementById('bg-canvas');
const ctx = canvas.getContext('2d');
let w, h, dpr;
let orbits = [];
let pulses = [];
let particles = [];
let mouse = { x: -1000, y: -1000 };
function resize() {
dpr = Math.min(window.devicePixelRatio || 1, 2);
w = window.innerWidth;
h = document.documentElement.scrollHeight;
canvas.width = w * dpr;
canvas.height = h * dpr;
canvas.style.width = w + 'px';
canvas.style.height = h + 'px';
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
// Orbital paths with satellites
function createOrbits() {
orbits = [];
const count = Math.max(4, Math.floor(w / 300));
for (let i = 0; i < count; i++) {
const cx = Math.random() * w;
const cy = Math.random() * h;
const rx = 120 + Math.random() * 280;
const ry = 40 + Math.random() * 100;
const tilt = (Math.random() - 0.5) * 1.2;
const speed = (0.0002 + Math.random() * 0.0004) * (Math.random() > 0.5 ? 1 : -1);
const sats = [];
const satCount = 1 + Math.floor(Math.random() * 2);
for (let j = 0; j < satCount; j++) {
sats.push({ angle: Math.random() * Math.PI * 2, pulseTimer: 0 });
}
orbits.push({ cx, cy, rx, ry, tilt, speed, sats });
}
}
// Floating signal particles (tiny dots drifting upward)
function createParticles() {
particles = [];
const count = Math.max(30, Math.floor((w * h) / 25000));
for (let i = 0; i < count; i++) {
particles.push({
x: Math.random() * w,
y: Math.random() * h,
vy: -(0.08 + Math.random() * 0.15),
vx: (Math.random() - 0.5) * 0.1,
size: 0.5 + Math.random() * 1.2,
alpha: 0.1 + Math.random() * 0.25,
flicker: Math.random() * Math.PI * 2,
});
}
}
function spawnPulse(x, y) {
pulses.push({ x, y, r: 2, maxR: 50 + Math.random() * 40, alpha: 0.35 });
}
function drawOrbitPath(orbit) {
ctx.save();
ctx.translate(orbit.cx, orbit.cy);
ctx.rotate(orbit.tilt);
ctx.beginPath();
ctx.ellipse(0, 0, orbit.rx, orbit.ry, 0, 0, Math.PI * 2);
ctx.strokeStyle = 'rgba(0, 212, 170, 0.04)';
ctx.lineWidth = 1;
ctx.stroke();
ctx.restore();
}
function drawSatellite(orbit, sat, dt) {
sat.angle += orbit.speed * dt;
const cos = Math.cos(orbit.tilt);
const sin = Math.sin(orbit.tilt);
const ex = orbit.rx * Math.cos(sat.angle);
const ey = orbit.ry * Math.sin(sat.angle);
const sx = orbit.cx + ex * cos - ey * sin;
const sy = orbit.cy + ex * sin + ey * cos;
// Satellite dot
ctx.beginPath();
ctx.arc(sx, sy, 2, 0, Math.PI * 2);
ctx.fillStyle = 'rgba(0, 212, 170, 0.7)';
ctx.fill();
// Faint glow
ctx.beginPath();
ctx.arc(sx, sy, 6, 0, Math.PI * 2);
const g = ctx.createRadialGradient(sx, sy, 0, sx, sy, 6);
g.addColorStop(0, 'rgba(0, 212, 170, 0.15)');
g.addColorStop(1, 'rgba(0, 212, 170, 0)');
ctx.fillStyle = g;
ctx.fill();
// Periodic signal pulse
sat.pulseTimer += dt;
if (sat.pulseTimer > 3000 + Math.random() * 500) {
sat.pulseTimer = 0;
spawnPulse(sx, sy);
}
}
function drawPulses(dt) {
for (let i = pulses.length - 1; i >= 0; i--) {
const p = pulses[i];
p.r += dt * 0.025;
p.alpha = 0.35 * (1 - p.r / p.maxR);
if (p.r >= p.maxR) { pulses.splice(i, 1); continue; }
ctx.beginPath();
ctx.arc(p.x, p.y, p.r, 0, Math.PI * 2);
ctx.strokeStyle = `rgba(0, 212, 170, ${p.alpha})`;
ctx.lineWidth = 1;
ctx.stroke();
// Second ring
if (p.r > 12) {
ctx.beginPath();
ctx.arc(p.x, p.y, p.r * 0.6, 0, Math.PI * 2);
ctx.strokeStyle = `rgba(0, 136, 255, ${p.alpha * 0.5})`;
ctx.stroke();
}
}
}
function drawParticles(dt, time) {
for (const p of particles) {
p.y += p.vy * dt * 0.06;
p.x += p.vx * dt * 0.06;
p.flicker += dt * 0.002;
if (p.y < -10) { p.y = h + 10; p.x = Math.random() * w; }
if (p.x < -10) p.x = w + 10;
if (p.x > w + 10) p.x = -10;
const flick = p.alpha * (0.6 + 0.4 * Math.sin(p.flicker));
// Mouse interaction - subtle brighten
const dx = p.x - mouse.x;
const dy = p.y - mouse.y;
const dist = Math.sqrt(dx * dx + dy * dy);
const boost = dist < 150 ? 0.3 * (1 - dist / 150) : 0;
ctx.beginPath();
ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
ctx.fillStyle = `rgba(0, 212, 170, ${Math.min(flick + boost, 0.6)})`;
ctx.fill();
}
}
// Faint grid lines (signal grid)
function drawGrid(time) {
ctx.strokeStyle = 'rgba(0, 212, 170, 0.015)';
ctx.lineWidth = 1;
const spacing = 120;
const offset = (time * 0.005) % spacing;
for (let x = -spacing + offset; x < w + spacing; x += spacing) {
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, h);
ctx.stroke();
}
for (let y = -spacing + offset * 0.7; y < h + spacing; y += spacing) {
ctx.beginPath();
ctx.moveTo(0, y);
ctx.lineTo(w, y);
ctx.stroke();
}
}
let last = 0;
function animate(now) {
const dt = last ? Math.min(now - last, 50) : 16;
last = now;
ctx.clearRect(0, 0, w, h);
drawGrid(now);
for (const orbit of orbits) {
drawOrbitPath(orbit);
for (const sat of orbit.sats) {
drawSatellite(orbit, sat, dt);
}
}
drawPulses(dt);
drawParticles(dt, now);
requestAnimationFrame(animate);
}
// Track mouse for particle interaction
document.addEventListener('mousemove', (e) => {
mouse.x = e.clientX;
mouse.y = e.clientY + window.scrollY;
});
// Resize handling
let resizeTimer;
function handleResize() {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(() => {
resize();
createOrbits();
createParticles();
}, 200);
}
// Keep canvas height synced with document
const ro = new ResizeObserver(() => { handleResize(); });
ro.observe(document.documentElement);
window.addEventListener('resize', handleResize);
resize();
createOrbits();
createParticles();
requestAnimationFrame(animate);
})();
</script>
</body> </body>
</html> </html>
docs/style.css
+16
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@@ -17,6 +17,22 @@
--gradient-end: #0088ff; --gradient-end: #0088ff;
} }
/* Animated background canvas */
#bg-canvas {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 0;
pointer-events: none;
}
body > *:not(#bg-canvas) {
position: relative;
z-index: 1;
}
* { * {
margin: 0; margin: 0;
padding: 0; padding: 0;