Add DocC and docs tooling support

.github/workflows/docs.yml

@@ -0,0 +1,37 @@
+name: Documentation
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/docs.yml"
+      - "CHANGELOG.md"
+      - "Package.swift"
+      - "README.md"
+      - "Sources/**"
+      - "docs/**"
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/workflows/docs.yml"
+      - "CHANGELOG.md"
+      - "Package.swift"
+      - "README.md"
+      - "Sources/**"
+      - "docs/**"
+
+jobs:
+  docbuild:
+    runs-on: macos-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Build DocC catalog
+        run: |
+          xcodebuild docbuild \
+            -scheme SimpleChart \
+            -destination 'platform=macOS' \
+            -derivedDataPath .build/DerivedData \
+            CODE_SIGNING_ALLOWED=NO

CHANGELOG.md

@@ -22,6 +22,8 @@
 - Public interaction helper types: `SCChartSelectionState`, `SCChartInspectionOverlay`, `SCChartScrollBehavior`, `SCChartGestureConfiguration`, and `SCChartHoverState`.
 - Viewport coordination helpers for centered, clamped, and zoomed visible-window updates.
 - Focused tests for the interaction-helper slice, including interaction helper state, wrapper configuration, and viewport utilities.
+- Zoomable navigation helpers: `SCChartTimeViewport`, `SCChartZoomBehavior`, and `SCChartNavigationCoordinator`.
+- Viewport-driven zoom support for `SCScrollableLineChart` and `SCScrollableTimeSeriesChart`, including focused tests for indexed and time-series navigation state.
 - Helper-style annotation presets for caption, badge, and formatted value-label rendering via `SCChartAnnotation`.
 - Availability-gated `SCSelectableSectorChart` and `SCSelectableDonutChart` wrappers for `SectorMark` angle-selection workflows on newer OS versions.
 - Focused tests for selectable sector/donut wrapper configuration and annotation helper presets.
@@ -33,6 +35,8 @@
 - Visible-domain and scroll-behavior presets for analytics- and finance-style windows.
 - Focused tests for inspection-wrapper configuration and time-series selection state.
 - A new `docs/tutorials/` learning path with sequenced tutorials for first chart setup, helper-first data construction, interactions, time-series, composed charts, and legacy migration.
+- A first-party `SimpleChart.docc` catalog with package overview and focused articles for getting started, wrapper selection, interactive charts, and legacy migration.
+- A contributor-facing `docs/editor-support.md` guide covering Xcode Quick Help, local DocC builds, and `sourcekit-lsp` usage.
 - Availability-gated vectorized plot wrappers: `SCNativeLinePlotChart`, `SCNativeAreaPlotChart`, `SCNativeBarPlotChart`, `SCNativePointPlotChart`, and `SCNativeRectanglePlotChart`.
 - Availability-gated function and parametric plot wrappers: `SCNativeFunctionLinePlotChart`, `SCNativeParametricLinePlotChart`, and `SCNativeFunctionAreaPlotChart`.
 - Availability-gated 3D wrappers and helpers: `SCChart3DPoint`, `SCChart3DPoseStyle`, `SCChart3DSeriesStyle`, `SCNative3DPointChart`, `SCNative3DRectangleChart`, `SCNative3DRuleChart`, and `SCNativeSurfacePlotChart`.
@@ -47,7 +51,8 @@
 
 ### Changed
 
-- Added Xcode Quick Help documentation to the first-discovery public API surface so the core models, styles, composition entrypoints, and primary wrappers are easier to explore directly from Xcode.
+- Added Xcode Quick Help documentation across the full exposed package API surface, including the native wrapper/helper layer and the deprecated compatibility layer, so every public type and entry point is easier to discover directly from Xcode.
+- Added richer Quick Help coverage for the zoom/navigation surface, including `SCChartTimeViewport`, `SCChartScrollBehavior`, `SCChartZoomBehavior`, and the scrollable interactive wrappers.
 - Raised minimum supported platform versions to Swift Charts baselines:
   - iOS 16+
   - macOS 13+
@@ -66,7 +71,9 @@
 - Refactored composed-chart annotation rendering and sector-selection overlays to use the shared `SCChartAnnotationLabelView` helper path.
 - Refactored selection and hover inspection rendering to share the same callout and value-label helper path.
 - Reworked the documentation entrypoint around a real quick-start flow, with dedicated getting-started and chart-selection guides for new users.
+- Added repository-level documentation discovery links for the DocC catalog and editor support guide, plus a CI docbuild path for keeping the package documentation healthy.
 - Expanded the README wrapper catalog and coverage/status sections to include the vectorized plot and 3D chart surface.
+- Updated the scrolling and time-series docs to show viewport-based zoom configuration for indexed and date-based interactive wrappers.
 
 ### Deprecated
 

README.md

@@ -11,8 +11,10 @@ If you are new to the package, start here instead of reading the full README top
 3. Use the focused guides below when you need the next step
 
 - [Getting Started](docs/getting-started.md)
+- [DocC Catalog Source](Sources/SimpleChart/SimpleChart.docc/SimpleChart.md)
 - [Tutorials](docs/tutorials/README.md)
 - [Chart Selection Guide](docs/chart-selection-guide.md)
+- [Editor Support](docs/editor-support.md)
 - [Migration from the legacy API](#migration-from-the-legacy-api)
 
 ## Platform requirements
@@ -41,10 +43,10 @@ The native layer is built around a small shared model surface:
 - `SCChartSectorSegment` for sector and donut charts
 - `SCChartBarGroup` and `SCChartStackSegment` for grouped and stacked bars
 - `SCChartTimePoint` for time-series datasets
-- `SCChartVisibleDomain` and `SCChartViewport` for scroll-window helpers
+- `SCChartVisibleDomain`, `SCChartViewport`, and `SCChartTimeViewport` for scroll-window helpers
 - `SCChartNumericValueFormat` and `SCChartDateValueFormat` for helper-style axis formatting
 - `SCChartSelection` for wrapper-managed chart selection state
-- `SCChartSelectionState`, `SCChartInspectionOverlay`, `SCChartScrollBehavior`, `SCChartGestureConfiguration`, and `SCChartHoverState` for reusable interaction configuration
+- `SCChartSelectionState`, `SCChartInspectionOverlay`, `SCChartScrollBehavior`, `SCChartZoomBehavior`, `SCChartGestureConfiguration`, and `SCChartHoverState` for reusable interaction configuration
 - `SCChartMark` for composed mark-based chart definitions
 - `SCChartAnnotationStyle`, `SCChartAnnotation`, `SCChartOverlay`, `SCChartScale`, and `SCChartComposition` for reusable composed-chart helpers
 
@@ -163,6 +165,14 @@ let scrollBehavior = SCChartScrollBehavior.continuous(.points(7))
 let timeWindow = SCChartScrollBehavior.timeWindow(hours: 24)
 let analyticsScroll = SCChartScrollBehavior.analytics(points: 21)
 let financeScroll = SCChartScrollBehavior.finance(tradingDays: 10)
+let timeViewport = SCChartTimeViewport.starting(
+    at: Date(timeIntervalSince1970: 1_700_000_000),
+    duration: 60 * 60 * 24
+)
+let zoomBehavior = SCChartZoomBehavior(
+    minimumVisibleLength: 3,
+    maximumVisibleLength: 14
+)
 let gestures = SCChartGestureConfiguration.interactive
 let compositionScale = SCChartScale(
     xVisibleDomain: .points(6),
@@ -356,7 +366,10 @@ struct RevenueExplorer: View {
     @State private var selectionState = SCChartSelectionState()
     @State private var hoverState: SCChartHoverState?
     @State private var viewport = SCChartViewport.starting(at: 0, length: 7)
-    @State private var scrollPosition = Date(timeIntervalSince1970: 1_700_000_000)
+    @State private var timeViewport = SCChartTimeViewport.starting(
+        at: Date(timeIntervalSince1970: 1_700_000_000),
+        duration: 7_200
+    )
 
     let points = SCChartPoint.make(
         labeledValues: [("Mon", 12), ("Tue", 18), ("Wed", 15), ("Thu", 20)]
@@ -394,14 +407,16 @@ struct RevenueExplorer: View {
                 points: points,
                 viewport: $viewport,
                 scrollBehavior: .continuous(.points(3)),
+                zoomBehavior: .init(minimumVisibleLength: 2, maximumVisibleLength: 7),
                 gestureConfiguration: .interactive,
                 yAxisFormat: .number(precision: 0)
             )
 
             SCScrollableTimeSeriesChart(
                 points: history,
-                scrollPosition: $scrollPosition,
+                viewport: $timeViewport,
                 scrollBehavior: .timeWindow(seconds: 7_200),
+                zoomBehavior: .init(minimumVisibleLength: 1_800, maximumVisibleLength: 14_400),
                 xAxisFormat: .hourMinute,
                 gestureConfiguration: .scrollOnly,
                 yAxisFormat: .compact

Sources/SimpleChart/Native/Charts/SCHoverableCharts.swift

@@ -9,6 +9,7 @@ import Charts
 import SwiftUI
 
 @available(iOS 17, macOS 14, tvOS 17, watchOS 10, macCatalyst 17, *)
+/// A line chart wrapper with pointer-hover inspection support.
 public struct SCHoverableLineChart: View {
     public let points: [SCChartPoint]
     public let seriesStyle: SCChartSeriesStyle
@@ -20,6 +21,7 @@ public struct SCHoverableLineChart: View {
 
     @Binding private var hoverState: SCChartHoverState?
 
+    /// Creates a hoverable line chart bound to external hover state.
     public init(
         points: [SCChartPoint],
         hoverState: Binding<SCChartHoverState?>,
@@ -153,6 +155,7 @@ public struct SCHoverableLineChart: View {
 }
 
 @available(iOS 17, macOS 14, tvOS 17, watchOS 10, macCatalyst 17, *)
+/// A bar chart wrapper with pointer-hover inspection support.
 public struct SCHoverableBarChart: View {
     public let points: [SCChartPoint]
     public let seriesStyle: SCChartSeriesStyle
@@ -163,6 +166,7 @@ public struct SCHoverableBarChart: View {
 
     @Binding private var hoverState: SCChartHoverState?
 
+    /// Creates a hoverable bar chart bound to external hover state.
     public init(
         points: [SCChartPoint],
         hoverState: Binding<SCChartHoverState?>,
@@ -270,6 +274,7 @@ public struct SCHoverableBarChart: View {
 }
 
 @available(iOS 17, macOS 14, tvOS 17, watchOS 10, macCatalyst 17, *)
+/// A scatter chart wrapper with pointer-hover inspection support.
 public struct SCHoverableScatterChart: View {
     public let points: [SCChartScatterPoint]
     public let seriesStyle: SCChartSeriesStyle
@@ -280,6 +285,7 @@ public struct SCHoverableScatterChart: View {
 
     @Binding private var hoverState: SCChartHoverState?
 
+    /// Creates a hoverable scatter chart bound to external hover state.
     public init(
         points: [SCChartScatterPoint],
         hoverState: Binding<SCChartHoverState?>,

Sources/SimpleChart/Native/Charts/SCInspectionWrappers.swift

@@ -313,6 +313,7 @@ public struct SCCrosshairScatterChart: View {
 }
 
 @available(iOS 17, macOS 14, tvOS 17, watchOS 10, macCatalyst 17, *)
+/// A time-series wrapper that always shows inspector-style selection callouts.
 public struct SCInspectorTimeSeriesChart: View {
     public let points: [SCChartTimePoint]
     public let seriesStyle: SCChartSeriesStyle
@@ -326,6 +327,7 @@ public struct SCInspectorTimeSeriesChart: View {
 
     @Binding private var selection: SCChartSelection?
 
+    /// Creates an inspector-style time-series wrapper bound directly to an optional selection.
     public init(
         points: [SCChartTimePoint],
         selection: Binding<SCChartSelection?>,
@@ -367,6 +369,7 @@ public struct SCInspectorTimeSeriesChart: View {
 }
 
 @available(iOS 17, macOS 14, tvOS 17, watchOS 10, macCatalyst 17, *)
+/// A time-series wrapper that always shows crosshair-style selection guides.
 public struct SCCrosshairTimeSeriesChart: View {
     public let points: [SCChartTimePoint]
     public let seriesStyle: SCChartSeriesStyle
@@ -381,6 +384,7 @@ public struct SCCrosshairTimeSeriesChart: View {
 
     @Binding private var selection: SCChartSelection?
 
+    /// Creates a crosshair-style time-series wrapper bound directly to an optional selection.
     public init(
         points: [SCChartTimePoint],
         selection: Binding<SCChartSelection?>,

Sources/SimpleChart/Native/Charts/SCNative3DCharts.swift

@@ -7,14 +7,17 @@
 
 import SwiftUI
 
+#if compiler(>=6.3)
 @available(iOS 26.0, macOS 26.0, visionOS 26.0, *)
 @available(tvOS, unavailable)
 @available(watchOS, unavailable)
+/// A 3D point chart wrapper built on the package's composed 3D mark layer.
 public struct SCNative3DPointChart: View {
     public let points: [SCChart3DPoint]
     public let style: SCChart3DSeriesStyle
     public let pose: SCChart3DPoseStyle
 
+    /// Creates a 3D point chart from prebuilt 3D points.
     public init(
         points: [SCChart3DPoint],
         style: SCChart3DSeriesStyle = .init(),
@@ -36,11 +39,13 @@ public struct SCNative3DPointChart: View {
 @available(iOS 26.0, macOS 26.0, visionOS 26.0, *)
 @available(tvOS, unavailable)
 @available(watchOS, unavailable)
+/// A 3D rectangle chart wrapper built on the package's composed 3D mark layer.
 public struct SCNative3DRectangleChart: View {
     public let points: [SCChart3DPoint]
     public let style: SCChart3DSeriesStyle
     public let pose: SCChart3DPoseStyle
 
+    /// Creates a 3D rectangle chart from prebuilt 3D points.
     public init(
         points: [SCChart3DPoint],
         style: SCChart3DSeriesStyle = .init(),
@@ -62,11 +67,13 @@ public struct SCNative3DRectangleChart: View {
 @available(iOS 26.0, macOS 26.0, visionOS 26.0, *)
 @available(tvOS, unavailable)
 @available(watchOS, unavailable)
+/// A 3D rule chart wrapper built on the package's composed 3D mark layer.
 public struct SCNative3DRuleChart: View {
     public let points: [SCChart3DPoint]
     public let style: SCChart3DSeriesStyle
     public let pose: SCChart3DPoseStyle
 
+    /// Creates a 3D rule chart from prebuilt 3D points.
     public init(
         points: [SCChart3DPoint],
         style: SCChart3DSeriesStyle = .init(),
@@ -88,6 +95,7 @@ public struct SCNative3DRuleChart: View {
 @available(iOS 26.0, macOS 26.0, visionOS 26.0, *)
 @available(tvOS, unavailable)
 @available(watchOS, unavailable)
+/// A 3D surface chart wrapper that samples a function across the rendered surface.
 public struct SCNativeSurfacePlotChart: View {
     public let xTitle: String
     public let yTitle: String
@@ -96,6 +104,7 @@ public struct SCNativeSurfacePlotChart: View {
     public let pose: SCChart3DPoseStyle
     public let function: @Sendable (Double, Double) -> Double
 
+    /// Creates a 3D surface chart from axis titles, style, and a z-value function.
     public init(
         xTitle: String,
         yTitle: String,
@@ -127,3 +136,4 @@ public struct SCNativeSurfacePlotChart: View {
         )
     }
 }
+#endif

Sources/SimpleChart/Native/Charts/SCNativeAreaChart.swift

@@ -7,13 +7,15 @@
 
 import SwiftUI
 
+/// A ready-made single-series categorical area chart backed by composed marks.
 public struct SCNativeAreaChart: View {
     public let points: [SCChartPoint]
     public let seriesStyle: SCChartSeriesStyle
     public let axesStyle: SCChartAxesStyle
     public let domain: SCChartDomain?
     public let referenceLines: [SCChartReferenceLine]
 
+    /// Creates an area chart from prebuilt categorical points.
     public init(
         points: [SCChartPoint],
         seriesStyle: SCChartSeriesStyle = .area(),
@@ -28,6 +30,7 @@ public struct SCNativeAreaChart: View {
         self.referenceLines = referenceLines
     }
 
+    /// Creates an area chart from floating-point values and optional labels.
     public init<T: BinaryFloatingPoint>(
         values: [T],
         labels: [String]? = nil,

Sources/SimpleChart/Native/Charts/SCNativeBandChart.swift

@@ -8,6 +8,7 @@
 import Charts
 import SwiftUI
 
+/// A chart that renders one or more highlighted y-range bands across shared categories.
 public struct SCNativeBandChart: View {
     public let categories: [String]
     public let bands: [SCChartBand]
@@ -18,6 +19,7 @@ public struct SCNativeBandChart: View {
     public let plotStyle: SCChartPlotStyle
     public let domain: SCChartDomain?
 
+    /// Creates a band chart from explicit categories and prebuilt bands.
     public init(
         categories: [String],
         bands: [SCChartBand],
@@ -44,6 +46,7 @@ public struct SCNativeBandChart: View {
         )
     }
 
+    /// Creates a band chart from floating-point band tuples.
     public init<T: BinaryFloatingPoint>(
         categories: [String],
         bands: [(String, T, T)],
@@ -72,6 +75,7 @@ public struct SCNativeBandChart: View {
         )
     }
 
+    /// Creates a band chart from integer band tuples.
     public init<T: BinaryInteger>(
         categories: [String],
         bands: [(String, T, T)],

Sources/SimpleChart/Native/Charts/SCNativeGoalChart.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 
+/// A composed chart that overlays goal reference lines on top of bar values.
 public struct SCNativeGoalChart: View {
     public let points: [SCChartPoint]
     public let goal: SCChartReferenceLine
@@ -15,6 +16,7 @@ public struct SCNativeGoalChart: View {
     public let axesStyle: SCChartAxesStyle
     public let domain: SCChartDomain?
 
+    /// Creates a goal chart from prebuilt categorical points and goal lines.
     public init(
         points: [SCChartPoint],
         goal: SCChartReferenceLine,
@@ -32,6 +34,7 @@ public struct SCNativeGoalChart: View {
         self.domain = domain ?? .auto(values: points.map(\.value) + referenceValues, baseZero: true)
     }
 
+    /// Creates a goal chart from floating-point values, optional labels, and goal lines.
     public init<T: BinaryFloatingPoint>(
         values: [T],
         labels: [String]? = nil,

Sources/SimpleChart/Native/Charts/SCNativeGroupedAreaChart.swift

@@ -8,6 +8,7 @@
 import Charts
 import SwiftUI
 
+/// A multi-series grouped area chart built from named line-series models.
 public struct SCNativeGroupedAreaChart: View {
     public let series: [SCChartLineSeries]
     public let axesStyle: SCChartAxesStyle
@@ -16,6 +17,7 @@ public struct SCNativeGroupedAreaChart: View {
     public let foregroundStyleScale: SCChartForegroundStyleScale
     public let referenceLines: [SCChartReferenceLine]
 
+    /// Creates a grouped area chart from prebuilt line-series values.
     public init(
         series: [SCChartLineSeries],
         axesStyle: SCChartAxesStyle = .standard(),