PHPIndex

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index.html 
wget 'https://lists2.roe3.org/mdrone/Merry-Christmas/index.html'
View Content 
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>🎄</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://public.codepenassets.com/css/reset-2.0.min.css">
    <link rel="stylesheet" href="./style.css">
  </head>
  <body>
  <div id="fixed-bg">
  <canvas id="c2"></canvas>
  <canvas id="c"></canvas>
</div>
    <script src='https://unpkg.com/gsap@3/dist/gsap.min.js'></script>
<script src='https://assets.codepen.io/721952/perlin.js'></script>
<script src='https://unpkg.com/gsap@3/dist/EasePack.min.js'></script>
<script  src="./script.js"></script>
</body> 
</html>
script.js 
wget 'https://lists2.roe3.org/mdrone/Merry-Christmas/script.js'
View Content 
const arr = []; // tree particles
const c = document.querySelector("#c");
const ctx = c.getContext("2d");
const cw = (c.width = 4000);
const ch = (c.height = 4000);
const T = Math.PI * 2;
const m = { x:cw/2, y:0 };
const xTo = gsap.quickTo(m, "x", {duration:1.5, ease:"expo"})
const yTo = gsap.quickTo(m, "y", {duration:1.5, ease:"expo"})

const arr2 = []; // snow particles
const c2 = document.querySelector("#c2");
const ctx2 = c2.getContext("2d");
c2.width = c2.height = 4000;

c.addEventListener('pointermove', (e)=> {
  const rect = c.getBoundingClientRect();
  const mouseX = e.x - rect.left;
  const mouseY = e.y - rect.top;
  const scaleX = c.width / rect.width;
  const scaleY = c.height / rect.height;
  const scaledMouseX = mouseX * scaleX;
  const scaledMouseY = mouseY * scaleY;
  xTo(scaledMouseX)
  yTo(scaledMouseY)
})

for (let i = 0; i < 999; i++) {
  arr.push({
    i: i,
    cx: cw/2,
    cy: gsap.utils.mapRange(0, 999, 600, 3700, i),
    r: (i<900)?gsap.utils.mapRange(0, 999, 3, 770, i):50, // path radius
    dot: 9, // dot radius
    prog: 0.25,
    s: 1
  });

  const d = 99 // tree spin duration
  arr[i].t = gsap
    .timeline({ repeat: -1 })
    .to(arr[i], { duration: d, prog: "+=1", ease: "slow(0.3, 0.4)" })
    .to(arr[i], { duration: d / 2, s: 0.15, repeat: 1, yoyo: true, ease: "power3.inOut" }, 0)
    .seek(Math.random() * d);
  
  arr2.push({
    x: cw * Math.random(),
    y: -9,
    i: i,
    s: 3 + 5 * Math.random(),
    a: .1 + .5 * Math.random()
  })
  
  arr2[i].t = gsap
    .to(arr2[i], { ease:'none', y:ch, repeat: -1 })
    .seek(Math.random()*99)
    .timeScale(arr2[i].s / 700 );
}

gsap.ticker.add(render);

function render() {
  ctx.clearRect(0, 0, cw, ch);
  ctx2.clearRect(0, 0, cw, ch);
  arr.forEach((c) => drawDot(c));
  arr2.forEach((c) => drawSnow(c));
}

ctx.fillStyle = ctx2.fillStyle = "#fff";
ctx.strokeStyle = "rgba(255,255,255,0.05)";
ctx.globalCompositeOperation = "lighter"

function drawDot(c) {
  const angle = c.prog * T;
  const vs = 0.2; // vertical scale of path
  const x = Math.cos(angle) * c.r + c.cx;
  const y = (Math.sin(angle) * c.r) * vs + c.cy;
  const d = Math.sqrt((x-m.x)**2 + (y-m.y)**2);
  const ms = gsap.utils.clamp(.07, 1, d/cw);
  ctx.beginPath();
  ctx.arc(x, y, c.dot * c.s/2/ms, 0, T);
  ctx.fill();
  ctx.lineWidth = c.dot * c.s * 2/ms;
  ctx.stroke();
}

function drawSnow(c) {
  const ys = gsap.utils.interpolate(1.3, 0.1, c.y/ch)
  ctx2.save();
  
  ctx2.beginPath();
  ctx2.translate(c.x, c.y);
  ctx2.rotate(50*c.t.progress());
  ctx2.arc(
    gsap.utils.interpolate(-55, 55, c.i/999),
    gsap.utils.interpolate(-25, 25, c.i/999),
    c.s * ys, 0, T );
  ctx2.globalAlpha = c.a * ys;
  ctx2.fill();
  ctx2.restore();
}

// intro
gsap.from(arr, {duration:1, dot:0, ease:'back.out(9)', stagger:-0.0009})
gsap.from(m, {duration:1.5, y:ch*1.2, ease:'power2.inOut'})
style.css 
wget 'https://lists2.roe3.org/mdrone/Merry-Christmas/style.css'
View Content 
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background:#000;
}

#fixed-bg {
  position: fixed;
  left:50%;
  top:50%;
  transform:translate(-50%, -50%);
  width:100vw;
  height:100vh;
}

canvas {
  position: absolute;
  top:50%;
  left:50%;
  transform:translate(-50%, -50%);  
  aspect-ratio: 1;
}

#c {
  width: auto;
  height: 100%;
}

#c2 {
  width: 100%;
  height: auto;
}

@media (max-aspect-ratio: 1) {
  #c {
    width: 100%;
    height: auto;
  }
  
  #c2 {
    width: auto;
    height: 100%;
  }
}