b9ee5ddfa3
- RealtimeChart composable with Canvas-based rendering - TieredBuffer: 3-tier ring buffer (5min full-rate, 10min @10Hz, 45min @1Hz) for 1h data support with ~5MB footprint - LodDecimator: MEAN / MIN_MAX / MIN_MAX(default) / LTTB render-time decimation - AxisRenderer: X/Y axis with INSIDE/BESIDE/HIDDEN label modes, T0-relative timestamps, scientific notation - SignalRenderer: clipRect-bounded path rendering with LoD - ChartTheme: Material3-compatible dynamic theming (light/dark) - package: dev.dtrentin.chart Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
53 lines
2.3 KiB
Markdown
53 lines
2.3 KiB
Markdown
# v0.2.0 — Bug Fix + Polish
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## Milestone Goal
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Fix axis visibility, add Material3 theme support, dynamic X-window, and scratch-array optimization.
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## Bugs (from user, 2026-05-20)
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1. Axis not visible — AxisRenderer draws only lines, no text labels
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2. X-axis length not dynamically adjustable from UI
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3. Chart colors must follow Material3 theme (primary, onPrimary, surface, etc.)
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4. Signal colors user-decided (already in SignalConfig.color — document + default fix)
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## Deferred from v0.1.0
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- LodDecimator scratch array allocation per frame
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- Double snapshot per frame in RealtimeChart
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## Phases
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| Phase | Name | Status |
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|-------|------|--------|
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| 1 | Material3 ChartTheme factory | Not started |
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| 2 | Axis text labels (TextMeasurer) | Not started |
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| 3 | Dynamic xWindowSeconds param | Not started |
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| 4 | LodDecimator scratch optimization | Not started |
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## Phase Details
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### Phase 1: Material3 ChartTheme factory
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File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/model/ChartTheme.kt`
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Add `@Composable fun rememberMaterialChartTheme(): ChartTheme` that reads from `MaterialTheme.colorScheme`:
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- `backgroundColor = colorScheme.surface`
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- `gridColor = colorScheme.outlineVariant.copy(alpha = 0.4f)`
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- `axisColor = colorScheme.outline`
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- `labelColor = colorScheme.onSurface`
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- Add `labelColor: Color` field to ChartTheme (for axis text)
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Signal colors remain in SignalConfig.color — user-decided.
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### Phase 2: Axis text labels
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File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/render/AxisRenderer.kt`
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- Add TextMeasurer param to drawXAxis / drawYAxis
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- Draw tick values as text at each grid line
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- Add padding (left ~48dp for Y labels, bottom ~24dp for X labels) — canvas inset via Modifier or internal inset
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ChartTheme needs `labelColor: Color` (Phase 1 prereq).
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### Phase 3: Dynamic xWindowSeconds
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File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/RealtimeChart.kt`
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Add `xWindowSeconds: Float = state.config.xWindowSeconds` parameter.
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Caller can pass `by remember { mutableStateOf(10f) }` and wire a Slider.
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### Phase 4: LodDecimator scratch optimization
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File: `chart-realtime/src/commonMain/kotlin/eu/henesis/chart/buffer/LodDecimator.kt`
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Fix TODO: pass pre-allocated `colMin`, `colMax`, `colHit` arrays as params.
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RealtimeChart pre-allocates and passes them.
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