thejayman77
d3854ac402
- SurfaceCalibrationScreen: two-sample guided flow from the Level header. Captures read SensorSource.gravity directly - stored calibration is never applied to either sample. Exact 180-degree same-plane guidance, clear-saved-calibration action, Surface persistence only. - SettlingDetector (core/sensors, shared): 1.0 deg/s enter, 0.3 deg/s exit held 500 ms; mid-band movement resets the quiet dwell without leaving Settling (audit finding 1). - StableSurfaceCapture (core/sensors): continuous 1.5 s settled window with the 5-degree calibration-surface guard; restarts on motion. - SurfaceCalibrationValidation (core/sensors): 3-degree bound on the combined two-axis bias magnitude, unit-tested both sides of the boundary (audit finding 2). - Lock feedback suppression is structural: the calibration route removes LevelScreen from composition, cancelling its sensor collection. 50 tests passing. Audited-by: Claude (2 findings raised and resolved) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
On the Level
Offline-first Android pocket toolset: a trustworthy level, angle meter, and calibrated screen ruler (Pro). Kotlin + Jetpack Compose, single module, no backend.
- BRIEF.md — the authoritative v1 product & technical brief
- AUDIT.md — audit of the brief; the amendments it lists are incorporated
- resources/ — concept board (visual direction)
Building
Open in Android Studio, or:
./gradlew assembleDebug # build
./gradlew testDebugUnitTest # measurement-math unit tests
Scaffold status
The project skeleton follows BRIEF.md §Sensor and measurement architecture. Implemented and tested:
core/sensors— sensor selection (game rotation vector → gravity → low-passed accelerometer), device-frame gravity stream, and the pure measurement math: orientation mapping, two-sample per-mode calibration (derived in angle space, applied in vector space so it stays correct away from zero), EMA smoothing, lock hysteresis/dwell/debounce, display deadband, placement validity, and the sensor-vector contract (all sources emit device-frame world-up; flat = +9.81 on Z, pinned bySensorContractTest). All unit-tested.core/settings— DataStore preferences and per-mode calibration persistence.core/billing— entitlement interface with a stub (free-tier) implementation.feature/level,feature/angle— live numeric scaffolds wired to the real sensor pipeline, with manual Surface|Edge selection, placement-validity hints, lock state (locked label states the tolerance so it can never contradict the rounded readout), and directional hold-to-zero (vector reference, not magnitude subtraction).feature/ruler,feature/tools— static placeholders.
Not yet implemented (deliberately — see TODO markers):
- The tactile vial visuals and the spring-animated display value (value 3 of 3 in the brief); scaffold screens render the deadbanded stable value directly.
- Guided calibration flow UI (math and persistence are done).
- Edge-mode readout counter-rotation on the portrait-locked activity.
- Play Billing implementation of
ProEntitlementRepository. - Screen ruler measurement UI and per-display scale persistence.
- Audio cue, reduced-motion behaviors, preferences UI.