thejayman77
99c2b12192
- Calibration: still derived in angle space via the 180-degree flip, but now APPLIED in vector space as a reference-orientation rotation (Rodrigues alignment for Surface, Z-rotation for Edge), exact away from zero; tests at 30 degrees, cross-axis, and edge-polarity cases. - Angle relative zero: stores the gravity direction vector; relative reading is the angle between directions, so cross-axis movement is honest. - Edge mode: precise geometry documented (either long edge down, gravity along +/-X), placement-validity guard so e.g. Edge mode never locks on a phone lying flat; UI shows repositioning hints. - Lock/readout coherence: locked label states the tolerance (exit threshold) so the rounded readout can never contradict it; pipeline acceptance tests pin the invariant. - Sensor-vector contract: documented and pinned by SensorContractTest. The suggested negation of gravity/accelerometer fallbacks is NOT applied: per Android SensorEvent docs, a stationary flat device reads +9.81 on Z (the gravity reaction), matching the rotation-vector path as-is. The contract tests prove all paths agree. 38 tests passing. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2.3 KiB
2.3 KiB
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.