68 lines
2.7 KiB
Markdown
68 lines
2.7 KiB
Markdown
# Backgammon Clock
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A two-player match clock with **simple delay you can actually see**. Reserve time
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plus a fixed number of free seconds each turn that never carry over — the
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Backgammon Galaxy control. Defaults to 3:00 + 15s.
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Plain HTML, CSS and JavaScript. No frameworks, no fonts, no images, no network.
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## Getting it onto your phone
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Chrome will only offer a real install over HTTPS, so the file needs a host.
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GitHub Pages is free and takes about two minutes:
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1. Create a new public repository, e.g. `bgclock`.
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2. Upload all six files to the root: `index.html`, `manifest.webmanifest`,
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`sw.js`, `icon-192.png`, `icon-512.png`, `icon-maskable-512.png`.
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3. **Settings → Pages → Source: Deploy from a branch → `main` / `(root)` → Save.**
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4. Wait a minute, then open `https://<you>.github.io/bgclock/` in Chrome on Android.
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5. Chrome menu (⋮) → **Add to Home screen** → **Install**.
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Open it from the home-screen icon and it runs fullscreen with no browser
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chrome, offline, with the screen kept awake while a game is on.
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If you're using a different path than `/bgclock/`, edit the `"id"` field in
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`manifest.webmanifest` to match, or just delete that line.
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To try it before hosting, open `index.html` in any browser — everything works
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except installation and the service worker.
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## Using it
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- **Tap your own half** to end your turn and start your opponent's clock.
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At the start, whoever taps first sets the *other* player going.
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- The waiting player's taps are ignored, so a stray hand won't stop the clock.
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- The bar under the big time is the delay draining. When it empties you get a
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soft tick and your reserve starts moving. That's the moment worth hearing.
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- **Reset** returns to the starting position. **Pause** freezes mid-turn and
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resumes exactly where it stopped, delay included.
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Backgammon clocks pause between games, and after a cocked die the delay is
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normally restarted — use pause and reset for those.
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## Settings
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| Setting | Range | Default |
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| --- | --- | --- |
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| Time | 0:15 – 99:00 | 3:00 |
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| Delay | 0 – 60 s | 15 s |
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| Colour | Sage, Brass, Slate, Teal, Plum | Sage |
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| Sound | on / off | on |
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Brass is the colour in the chess.com app, if you want the exact original look.
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Changing time or delay resets the clock. Settings are remembered on the device.
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## Sounds
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All three are generated with the Web Audio API, so there are no audio files to
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download and nothing to attribute.
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- **Turn change** — a soft rising fifth with an octave partial, marimba-like.
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- **Delay expiry** — a single quiet 300 Hz tick, deliberately easy to miss unless
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you're listening for it.
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- **Time out** — a falling triad, loud and unambiguous.
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## Licence
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Do whatever you like with it.
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