hansdezwartandClaude Opus 5
632f1ef47d
Android's swipe-up-from-the-bottom is how you leave an app, and the bottom panel owns that edge — .app is 1fr auto 1fr with the bar in the middle, so both panels run to the screen edges. Acting on pointerdown meant starting a swipe home was a finger landing on the clock, and the turn changed before the gesture had even been recognised. The status bar over the top panel has the same problem. Android won't let an app opt out either; setSystemGestureExclusionRects is ignored for the home gesture. So a tap is now a press and a lift in the same place, within 12px. A swipe travels further; a gesture the system claims arrives as pointercancel and never becomes a lift. The clock is still stamped at the press. tap() takes the pointerdown timestamp, which meant dropping elapsed() for now - st.turnAt — elapsed() always measures to the current instant, the one thing that can't be backdated. With the delay forced to 0, holding a finger down 600ms longer charges the outgoing player 1033ms against 1037ms for an instant lift: the same thinking time, not the extra 600. The fullscreen request moved to the lift too, so a swipe can't force it. touch-action:none on .panel means a slow drag ends in a lift we reject rather than a cancel the browser issues on its own account; it changes no pixels. Falls out of it: a hand dragged across a live panel no longer flips the turn, which the README only promised of the waiting player's hand. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
161 lines
7.7 KiB
Markdown
161 lines
7.7 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 + 12s.
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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/` on your phone.
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5. **Android, Chrome:** menu (⋮) → **Add to Home screen** → **Install**.
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**iOS, Safari:** Share (□↑) → **Add to Home Screen** → **Add**. It has to be
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Safari — Chrome and Firefox on iOS can't install a web app.
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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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On iOS a few things behave differently, none of them fatal:
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- **Install from Safari, and play from the home-screen icon.** In a Safari tab
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you lose a strip of the screen to the toolbar, and iOS clears the saved
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settings of a site you haven't visited for a week. The installed app keeps
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its own storage and doesn't get pruned that way.
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- **There's no vibration** — iOS gives web pages no haptics at all, so the
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turn-change buzz is silent there. The sounds still play.
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- **The ringer switch doesn't mute the clock.** The page claims a playback
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audio session so you can hear the delay tick with the phone silenced, which
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in exchange pauses any music you had going. If you'd rather keep the music,
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delete the `navigator.audioSession` line in `index.html`.
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- **Screen wake needs iOS 16.4 or newer.** Below that the screen dims on its
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usual schedule mid-game.
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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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- A tap counts when you **lift** your finger, and only if it didn't move. A swipe
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does nothing, so Android's swipe-up-from-the-bottom and the status-bar pull-down
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work over either half without costing anyone their turn — and a hand dragged
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across the panel won't change it either. The clock still switches at the moment
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you pressed, not when you let go.
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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** starts a whole new match: clocks back to full *and* the score back to
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0–0. It takes two taps: the first arms the button — it lights up and a ring
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unwinds around it — and a second tap within those two seconds does it. One
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stray thumb can't wipe a live match.
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- **Pause** freezes mid-turn and resumes exactly where it stopped, delay
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included. Opening either sheet pauses automatically. The settings sheet leaves
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it paused — everything in there resets the clocks anyway — while the score
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sheet picks the turn back up when you close it, so glancing at the score
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doesn't cost you a tap on play.
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- **Settings are only reachable before a match starts.** Every control in that
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sheet resets both clocks, so the gear disappears the moment the first tap
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starts the clock and comes back after a reset. Its space in the bar is kept
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empty, so nothing else shifts. That means a mistake in the time or delay can
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only be fixed by resetting and starting the match again — deliberately, since
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the alternative is wiping two live clocks by accident. Correcting a clock
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mid-match is what the score sheet is for.
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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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## Matches
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Set **Match** in the settings to the number of points you're playing to — 1, 3,
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5 and up to 29. The time you set is *per point*, so a 5-point match at 2:00 a
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point puts 10:00 on each clock, and the settings sheet shows you that sum.
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Each half reads the state from that player's own side of the board:
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```
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You: 1 out of 5
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Them: 3
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Moves: 7
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```
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So "You" always means whoever is sitting at that end — both players read their
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own score on the top line, and the two halves show mirrored numbers.
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At **1 point** there's no match to keep score of, so the score lines and the
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score-sheet icon all disappear and you get the plain single-game clock with just
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its move count. Set the match to 3 or more and they come back.
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The score sheet is the middle icon in the bar. It's filled in from the phone
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holder's side: **You** is the bottom half, **Them** the far end.
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Nothing in that sheet takes effect until you press **Done**:
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- **Done with nothing changed** leaves everything exactly as it was — same turn,
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same delay part-spent, same move counts — and the clock picks up where it left
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off. Tapping outside the sheet is the same as changing nothing, so a stray tap
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can't restart a game. A pause you set yourself before opening the sheet
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survives; only the sheet's own pause is undone.
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- **Change a score** and the game restarts when you press Done: move counters
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back to zero and the turn back to the first tap, waiting on whoever rolls the
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lower die. The clocks keep whatever they were showing.
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- **Change only a clock** — the sheet also lets you correct either player's time
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to the second — and the game carries on undisturbed and running: same turn,
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same delay position, same moves.
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Shortening the match to fewer points than someone has already won pulls their
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score down to fit.
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## Settings
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At the top of the sheet are three presets — **2m / 12s**, **3m / 12s** and
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**3m / 15s**. Tapping one jumps both timers there and lights it up. Change the
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time or delay by hand and the highlight goes out; land back on a preset's
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numbers and it comes back on.
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| Setting | Range | Default |
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| --- | --- | --- |
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| Match | 1 – 29 points, odd | 1 |
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| Time | 0:15 – 99:00 per point | 3:00 |
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| Delay | 0 – 60 s | 12 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 match, time or delay resets the clocks — the score is left alone, so you
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can fix the delay mid-match without losing where you are.
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Settings **and the match in progress** are kept in `localStorage`, so they
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survive closing the tab, force-quitting the installed app and rebooting the
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phone — the app also asks for persistent storage so they aren't evicted when the
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device runs low on space (Chrome honours that request; Safari ignores it).
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Reopening restores the score, both clocks, the move counts, whose turn it is and
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how much delay was left. The one thing it can't restore is time passing while
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the app was closed, so it comes back paused rather than charging anyone for the
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gap: a crash shouldn't decide a game.
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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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