feat(chart): enhance zoom viewport interactions

src/components/core/layout.test.ts

@@ -66,6 +66,7 @@ function layoutForSeries(
     overlayMode: 'single-axis',
     independentTransforms: [transform],
     sharedZoomDomain: sourceSeries.xDomain,
+    yDomains: undefined,
     timeUnit: 'ms',
     rendering,
     hideSecondaryLabels: false,
@@ -75,6 +76,42 @@ function layoutForSeries(
 }
 
 describe('multi-value Y-axis grouping', () => {
+  it('uses a configured visible Y domain for axis and series scales', () => {
+    const source = series('a', 0, 100)
+    const sourceTrack = track([source])
+    const result = buildTrackLayouts({
+      cells: [
+        {
+          slotIndex: 0,
+          row: 0,
+          column: 0,
+          left: 0,
+          top: 0,
+          width: 120,
+          height: 100,
+          plotHeight: 100,
+          cellHeight: 130,
+          xAxisBand: 30,
+          series: sourceTrack,
+        },
+      ],
+      grid: { rowCount: 1, columnCount: 1, showPagination: false },
+      displayMode: 'independent',
+      overlayMode: 'single-axis',
+      independentTransforms: [zoomIdentity],
+      sharedZoomDomain: [0, 1],
+      yDomains: { track: [25, 75] },
+      timeUnit: 'ms',
+      rendering: DEFAULT_WAVEFORM_RENDERING_OPTIONS,
+      hideSecondaryLabels: false,
+      yAxisLabelX: -50,
+      showCompactEmptyTracks: false,
+    })[0]
+
+    expect(result?.yScale.domain()).toEqual([25, 75])
+    expect(result?.seriesPaths[0]?.yScale.domain()).toEqual([25, 75])
+  })
+
   it('keeps every overlaid series on one axis in single-axis mode', () => {
     const groups = buildYAxisSeriesGroups(
       track([series('a', 0, 1), series('b', 10, 20)]),

src/components/core/layout.ts

@@ -190,6 +190,9 @@ export interface BuildTrackLayoutsOptions {
   overlayMode: WaveformOverlayMode
   independentTransforms: ZoomTransform[]
   sharedZoomDomain: [number, number]
+  initialXDomain?: [number, number]
+  initialXDomains?: Record<string, [number, number]>
+  yDomains?: Record<string, [number, number]>
   timeUnit: 's' | 'ms'
   rendering: ResolvedWaveformRenderingOptions
   hideSecondaryLabels: boolean
@@ -226,14 +229,23 @@ export function buildTrackLayouts(options: BuildTrackLayoutsOptions): TrackLayou
     const series = displayTrack.visibleSeries[0] ?? displayTrack.series[0] ?? emptySeries
     const baseXScale =
       options.displayMode === 'independent'
-        ? scaleLinear(displayTrack.xDomain, [0, cell.width])
+        ? scaleLinear(
+            options.initialXDomains?.[displayTrack.id] ??
+              options.initialXDomains?.[series.id] ??
+              displayTrack.xDomain,
+            [0, cell.width],
+          )
         : scaleLinear(options.sharedZoomDomain, [0, cell.width])
     const transform =
       options.displayMode === 'independent'
         ? (options.independentTransforms[index] ?? zoomIdentity)
         : zoomIdentity
     const xScale = transform.rescaleX(baseXScale)
-    const yAxisGroups = buildYAxisSeriesGroups(displayTrack, options.overlayMode)
+    const configuredYDomain = options.yDomains?.[displayTrack.id]
+    const yAxisGroups = buildYAxisSeriesGroups(displayTrack, options.overlayMode).map((group) => ({
+      ...group,
+      domain: configuredYDomain ?? group.domain,
+    }))
     const sideOffsets = { left: 0, right: 0 }
     const yAxes: WaveformYAxisLayout[] = yAxisGroups.map((group) => {
       const scale = scaleLinear(group.domain, [cell.plotHeight, 0]).nice()