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Add twinkling star background effect to the web flasher page

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Ports the same triangle-wave dim/brighten twinkle formula used by
MenuStars on the device to a lightweight, dependency-free canvas
overlay behind the page content, tying the web flasher's look to the
device UI. Star count scales with viewport area (40-160) instead of a
fixed number. The canvas uses z-index:0 (not negative) and
pointer-events:none so it stacks reliably behind .container without
blocking the ESP Web Tools install button or any links.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Eiswolf-BG
2026-08-12 00:36:29 +02:00
parent 370f5fa310
commit 6cd163bd81
1 changed files with 74 additions and 0 deletions
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74
index.html
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@@ -35,6 +35,23 @@
max-width: 450px;
width: 100%;
position: relative;
z-index: 1;
}
/* Twinkling star background (same triangle-wave dim/brighten
formula as menu_stars.cpp/radar_screen.cpp on the device) -
placed as the first element in <body> and given z-index:0
(NOT a negative z-index) so it stacks reliably behind
.container without depending on how the browser paints the
body's own background layer. pointer-events:none keeps the
ESP Web Tools install button and all links fully clickable. */
#star-bg {
position: fixed;
inset: 0;
width: 100%;
height: 100%;
z-index: 0;
pointer-events: none;
}
h1 {
font-size: 22px;
@@ -91,6 +108,7 @@
<script data-goatcounter="https://eiswolf-bg.goatcounter.com/count" async src="//gc.zgo.at/count.js"></script>
</head>
<body>
<canvas id="star-bg"></canvas>
<div class="container">
<h1>EISWOLFS FLIGHTRADAR CYD</h1>
<div class="subtitle">Firmware Flash Utility</div>
@@ -109,5 +127,61 @@
<div class="browser-note">Requires Chrome, Edge, or Opera (Web Serial API)</div>
</div>
<script>
(function () {
// Same triangle-wave dim/brighten twinkle formula (phase 0-255-0) used
// by MenuStars on the device - ties the web flasher's look to the
// device UI. STAR_COUNT scales with viewport area instead of a fixed
// number, so it stays sparse-but-present on both small phones and
// large desktop windows without needing a manual breakpoint.
const canvas = document.getElementById('star-bg');
if (!canvas) return;
const ctx = canvas.getContext('2d');
let stars = [];
function starCountFor(w, h) {
const density = (w * h) / 9000;
return Math.max(40, Math.min(160, Math.round(density)));
}
function resize() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
function initStars() {
const count = starCountFor(canvas.width, canvas.height);
stars = [];
for (let i = 0; i < count; i++) {
stars.push({
x: Math.random() * canvas.width,
y: Math.random() * canvas.height,
phase: Math.random() * 256,
speed: 1 + Math.random() * 2
});
}
}
let resizeTimer = null;
window.addEventListener('resize', () => {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(() => { resize(); initStars(); }, 150);
});
resize();
initStars();
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (const s of stars) {
s.phase = (s.phase + s.speed) % 256;
const bright = s.phase < 128 ? s.phase * 2 : (255 - s.phase) * 2;
ctx.fillStyle = `rgb(0, ${bright}, 0)`;
ctx.fillRect(s.x, s.y, 2, 2);
}
requestAnimationFrame(draw);
}
draw();
})();
</script>
</body>
</html>