mirror of
https://bitbucket.org/siakitem/my-pi.git
synced 2026-08-28 16:45:22 +00:00
58 lines
2.8 KiB
HTML
58 lines
2.8 KiB
HTML
<!doctype html>
|
||
<meta charset="utf-8">
|
||
<title>26 mousemove rate</title>
|
||
<link rel="stylesheet" href="../_style.css">
|
||
<script src="../_lib.js"></script>
|
||
<body>
|
||
<main>
|
||
<p>Goal: sweep the mouse across the box for ~1s, then click the green button.
|
||
Page measures the inter-event timestamp distribution of <code>mousemove</code>
|
||
events. Real pointing devices fire at ~60–250 Hz (median Δt 4–18ms). Bridges
|
||
that flood synthetic moves on a tight <code>for</code>-loop or
|
||
<code>setTimeout(...,1)</code> produce a degenerate distribution
|
||
(most Δt < 2ms, or all Δt identical, or median > 50ms with no jitter).</p>
|
||
<div id="pad" style="height:160px;border:1px solid #555;background:#fff;color:#111;display:flex;align-items:center;justify-content:center;font:13px monospace;user-select:none">
|
||
sweep me
|
||
</div>
|
||
<button id="go" style="margin-top:14px;padding:12px 20px;background:#1f7a1f;color:#fff;border:0;border-radius:6px">Done</button>
|
||
</main>
|
||
<script>
|
||
Challenge.init({ id: "mousemove-rate", instructions: "sweep mouse across pad ~1s, then click Done" });
|
||
|
||
const pad = document.getElementById("pad");
|
||
const stamps = [];
|
||
pad.addEventListener("mousemove", (e) => { stamps.push(e.timeStamp); });
|
||
|
||
document.getElementById("go").addEventListener("click", (e) => {
|
||
if (!e.isTrusted) return Challenge.fail("Done click isTrusted=false");
|
||
if (stamps.length < 20) return Challenge.fail(`only ${stamps.length} mousemove events (need ≥20)`);
|
||
|
||
const deltas = [];
|
||
for (let i = 1; i < stamps.length; i++) deltas.push(stamps[i] - stamps[i-1]);
|
||
deltas.sort((a,b) => a-b);
|
||
const median = deltas[Math.floor(deltas.length/2)];
|
||
const p10 = deltas[Math.floor(deltas.length*0.1)];
|
||
const p90 = deltas[Math.floor(deltas.length*0.9)];
|
||
const mean = deltas.reduce((s,x)=>s+x,0) / deltas.length;
|
||
const variance = deltas.reduce((s,x)=>s+(x-mean)**2,0) / deltas.length;
|
||
const std = Math.sqrt(variance);
|
||
|
||
const allSame = deltas.every(d => Math.abs(d - deltas[0]) < 0.05);
|
||
const allTiny = deltas.every(d => d < 1.5);
|
||
|
||
Challenge.log("dist", { n: deltas.length, median, p10, p90, mean, std });
|
||
const bad = [];
|
||
if (allSame) bad.push(`all Δt identical (~${deltas[0].toFixed(2)}ms) — scripted loop`);
|
||
if (allTiny) bad.push(`all Δt < 1.5ms — synthetic flood`);
|
||
if (median < 2) bad.push(`median Δt ${median.toFixed(2)}ms too fast for a real device`);
|
||
if (median > 60) bad.push(`median Δt ${median.toFixed(0)}ms too slow (real moves ~4–18ms)`);
|
||
if (std < 0.5) bad.push(`Δt std=${std.toFixed(2)}ms — no jitter (scripted)`);
|
||
// Ratio p90/p10 should be ≥1.8 for organic motion.
|
||
if (p10 > 0 && (p90 / p10) < 1.5) bad.push(`p90/p10 ratio ${(p90/p10).toFixed(2)} — distribution too narrow`);
|
||
|
||
if (bad.length) Challenge.fail(...bad);
|
||
else Challenge.pass(`n=${deltas.length}, median=${median.toFixed(1)}ms, std=${std.toFixed(1)}ms`);
|
||
});
|
||
</script>
|
||
</body>
|