The mobile product flavor ships both a modern Jetpack Compose + Vico 3.x chart
and the original C++/OpenGL ES 2 / NanoVG renderer. Users can switch between them at runtime.
| Area | Legacy UI (OpenGL/NanoVG) | New UI (Vico/Compose) |
|---|---|---|
| Rendering | C++ NanoVG (OpenGL ES 2) | Kotlin Jetpack Compose + Vico 3.x |
| Theming | Manual C++ colour tables | Material 3 / Material You (dynamicColorScheme) |
| Orientation | Hard-locked landscape | Free rotation (portrait + landscape, user-configurable) |
| Dark mode | C++ invert flag | isSystemInDarkTheme() xor invertColors |
| Gestures | C++ touch callbacks | Vico built-in scroll, fling, pinch-zoom |
| Stats panel | C++ NanoVG overlays | Compose: latest value, trend arrow (↑↑/↑/→/↓/↓↓), TIR 24h |
| Sensor colours | Single colour | Per-sensor palette (blue/green/red/amber) |
| Target bands | C++ drawn lines | Vico HorizontalLine decorations |
| Accessibility | None | contentDescription / semantics on all chart elements |
Open Settings → "Use new chart (Vico)" checkbox:
- Checked (default): Vico/Compose chart, free rotation (portrait + landscape).
- Unchecked: Legacy OpenGL/NanoVG chart, always landscape (original behaviour).
The preference is persisted across app restarts. The activity recreates immediately on toggle.
The WearOS flavor is unchanged — it continues to use the C++/OpenGL/NanoVG renderer.
Both UIs share all non-rendering app logic (NFC, Bluetooth, dialogs, settings, alarms).
GlucoseCurve is always created and acts as a headless helper for menus, NFC callbacks,
and dialogs even when the Vico chart is the active content view.
The runtime switcher is Applic.useVicoChart() / Applic.setUseVicoChart(boolean),
backed by SharedPreferences (key use_vico_chart, default true).