78b8ebeb7d
Replace REQUIREMENTS.md as source of truth with the pm-board yaml. Drop README friction-scalar lies. Include pending HUD frontend work.
82 lines
3.3 KiB
Markdown
82 lines
3.3 KiB
Markdown
## curltastic
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A multiplayer 2D curling game for mobile browser. Any number of clients can join a room, pick **Team 1** or **Team 2** freely, and throw when it is that team's turn (solo pass-and-play or remote opponents). Default palette: Team 1 red, Team 2 yellow.
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Product must-haves and decided hows live in `.pm/board.yaml`.
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- **Backend** — Rust, Axum, WebSocket, Rapier2D physics (server-authoritative, 120 Hz).
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- **Frontend** — TypeScript, Vite, Canvas2D, portrait-first touch UI.
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### Run locally
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1. Install Rust via [rustup](https://rustup.rs/) (if not already installed).
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2. Start the backend:
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```bash
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cd backend
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cargo run --release
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# listens on 0.0.0.0:3000
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```
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3. Start the frontend dev server:
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```bash
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cd frontend
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npm install
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npm run dev
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# opens on 0.0.0.0:5173 by default
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```
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4. Open one or more browser tabs to the same room URL, e.g.:
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```
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http://localhost:5173/?room=DEMO1
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```
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Use the team dropdown to switch between Team 1 and Team 2 anytime. Use *Copy share link* to invite another device.
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### Controls
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- On your team's turn, drag on solid ice to place the broom (aim is **not** limited to the house).
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- Otherwise, drag to pan (default framing shows house + sidelines; pan up toward the hog line).
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- Team dropdown: free switch mid-game (solo: throw for Team 1, switch, throw for Team 2).
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- Weight slider: draws 1–10 then takeouts hack, board, control, normal, peel. Curl buttons.
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- Tap **THROW**. Anyone joined as the current turn team may throw.
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- Parallel multi-stone trajectories; rotation θ comes from physics.
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- Skeuomorphic 2×8 stones-left HUD; end-of-end overlay with scoreboard (player dismisses).
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### Physics (high level)
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- Discrete weight labels map to calibrated release speeds (m/s) on the server.
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- Ice friction µ(v) table (interpolated) on the server; linear and angular damping share the table.
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- Curl: initial |ω| = 5 rot / 14 s; lateral continuous model (clockwise → right).
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- Stone–stone contacts are **nearly elastic** (`STONE_RESTITUTION = 0.9`) so takeouts launch both rocks along the impact line instead of plastic-sticking.
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- Back line and sidelines are **not** colliders — touch → out of play after sim.
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- Stone ids: `{ team, n }` with n = 1…8 per team per end.
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- Foot-derived radii use `FEET_TO_METERS = 0.3048`.
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### Architecture / protocol
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- WebSocket JSON, snake_case tags.
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- `game_state` includes totals, hammer, turn_team, **scoreboard** (per end: hammer, team1 pts, team2 pts), **stones_remaining**, stones.
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- `trajectories` message: `{ stones: [{ stone_id, rotation, team, trajectory: [[x,y,theta], ...] }] }` sampled at 40 Hz from 120 Hz sim (`t = index / 40`).
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- No room-full limit; no `end_scored` message (scoreboard replaces it).
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### E2E tests
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With the backend running (`cargo run --release` on :3000):
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```bash
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cd e2e
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npm install -g ws # or npm install ws
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node e2e_test.cjs
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node e2e_score.cjs
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node e2e_persistence.cjs
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node e2e_multi_client.cjs
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node e2e_end_score.cjs # full end → scoreboard entry + next end
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node collision_trajectory_qa.cjs
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node load_test.cjs # optional concurrent rooms
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```
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Unit tests: `cd backend && cargo test`, `cd frontend && npm test`.
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### Limitations
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- No accounts, persistence, anti-cheat, replay log, or turn timer.
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- Sweeping not implemented.
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- Stones past back/sideline/hog rules are removed from play after simulation.
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