# v0.2.0 — Bug Fix + Polish

## Milestone Goal
Fix axis visibility, add Material3 theme support, dynamic X-window, and scratch-array optimization.

## Bugs (from user, 2026-05-20)
1. Axis not visible — AxisRenderer draws only lines, no text labels
2. X-axis length not dynamically adjustable from UI
3. Chart colors must follow Material3 theme (primary, onPrimary, surface, etc.)
4. Signal colors user-decided (already in SignalConfig.color — document + default fix)

## Deferred from v0.1.0
- LodDecimator scratch array allocation per frame
- Double snapshot per frame in RealtimeChart

## Phases

| Phase | Name | Status |
|-------|------|--------|
| 1 | Material3 ChartTheme factory | Not started |
| 2 | Axis text labels (TextMeasurer) | Not started |
| 3 | Dynamic xWindowSeconds param | Not started |
| 4 | LodDecimator scratch optimization | Not started |

## Phase Details

### Phase 1: Material3 ChartTheme factory
File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/model/ChartTheme.kt`
Add `@Composable fun rememberMaterialChartTheme(): ChartTheme` that reads from `MaterialTheme.colorScheme`:
- `backgroundColor = colorScheme.surface`
- `gridColor = colorScheme.outlineVariant.copy(alpha = 0.4f)`
- `axisColor = colorScheme.outline`
- `labelColor = colorScheme.onSurface`
- Add `labelColor: Color` field to ChartTheme (for axis text)
Signal colors remain in SignalConfig.color — user-decided.

### Phase 2: Axis text labels
File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/render/AxisRenderer.kt`
- Add TextMeasurer param to drawXAxis / drawYAxis
- Draw tick values as text at each grid line
- Add padding (left ~48dp for Y labels, bottom ~24dp for X labels) — canvas inset via Modifier or internal inset

ChartTheme needs `labelColor: Color` (Phase 1 prereq).

### Phase 3: Dynamic xWindowSeconds
File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/RealtimeChart.kt`
Add `xWindowSeconds: Float = state.config.xWindowSeconds` parameter.
Caller can pass `by remember { mutableStateOf(10f) }` and wire a Slider.

### Phase 4: LodDecimator scratch optimization
File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/buffer/LodDecimator.kt`
Fix TODO: pass pre-allocated `colMin`, `colMax`, `colHit` arrays as params.
RealtimeChart pre-allocates and passes them.