any_sparklines

• Added a configurable eps threshold to pie layout and data-bounds computations.
• Fixed lint warnings for unbraced if statements.

• Breaking: unit-aware visual lengths

  • ThicknessData.size, ThicknessOverride.size, marker radius, and chart/data-point border radius now use ILengthValue.
  • Added Px, Vw, Vh, Dx, and Dy; viewport units follow CSS percentage semantics (Vw(1) is 1%).
  • Added deferred cross-unit interpolation and support for custom length implementations through ILengthContext.

• Breaking: simplified layouts

  • Removed RelativeDimension, RelativeLayout.relativeTo, and IChartLayout.transformScalar().
  • ChartTransform no longer accepts an IChartLayout; it resolves lengths from its dimensions and path matrix.
  • Layouts now transform plot coordinates only; each visual value owns its sizing policy.
  • Pie auto-bounds are derived from data geometry and no longer include visual thickness, borders, corners, or markers.

• LineData

  • Added LineData.scatter(points: ...) for marker-only x/y plots without connected lines or area fills.
  • Added ScatterLineData; scatter rendering is selected through lineType and can be changed with copyWith(lineType: ...).
  • Single-point line and scatter data now render their point marker.

• Breaking: custom line types

  • ILineTypeData now requires drawLine and minPoints so renderers can determine whether and when to draw connected geometry.

• DataPoint and DataPointPipeline

  • Added DataPoint.z as an interpolated third dimension that does not affect layout bounds.
  • Added direct Object? point keys for selecting pipeline transformations; keys retain the source value at t <= 0 and adopt the destination value afterward during interpolation.
  • Removed IDataPointMeta and replaced DataPointMeta with the value-based DataPointKey, retaining its id, string key, and label fields.
  • Added rescaleZ() with shared automatic bounds, optional clamping, and target-midpoint handling for equal z values.
  • Added scatterZ() with optional key/predicate filtering and z-interpolated StylesInterval/ExtentsInterval metadata.
  • Added optional groupingStep to stack(). When provided, nearby x values are grouped into rounded buckets of that size; the default remains exact x matching.
  • Added optional z ordering to sort().

• Visual lengths

  • Added Vmin and Vmax for percentages of the shorter and longer logical viewport dimensions.

• Chart insets and point fitting

  • Added reusable ChartInsets with optional left, top, right, and bottom ILengthValues for global widget padding and local per-chart padding.
  • Added ChartInsets.all(), ChartInsets.horizontal(), and ChartInsets.vertical() convenience constructors.
  • Added CircleDataPointStyle.extent for a symmetric point extent matching the circle radius.
  • ChartInsets implements IDataPointExtent and can be stored in DataPoint.data for automatic, position-aware visual overflow fitting around (x, fy).
  • Global padding, local padding, and point overflow are combined once from the preliminary transform without changing source data or layout bounds.
  • Charts sharing a layout receive one aligned inset transform; over-constrained axes collapse to the weighted position between their opposing insets.

• Seat maps

  • Added SeatKey with an optional database/display label and value identity based on area, row, and column.
  • Added SeatSelector with OR-set label, row, column, and nullable-area filters plus OR-of-AND tag groups.
  • Added deferred SeatsBuilder actions for fluent row and column geometry with labels, horizontal and vertical gaps, skipped slots, z values, tags, areas, and point metadata.
  • Added nestable record()/repeat() blocks and reusable saveRecord() action templates for replaying seat-layout sequences during build().
  • Added saveState(), saveOnlyState(), and restoreState() for deferred gap, area, tag, and data snapshots.
  • Added ISeatLabelBuilder, default NullLabels, and exact-consumption ListLabels with end-of-build validation.
  • Added DataPointPipeline.seats() for fixed style and optional extent decoration using selectors, predicates, and exact seat keys.

• Breaking: custom chart data

  • Replaced ChartPadding with ChartInsets without a compatibility alias.
  • IDataPointExtent now extends IDataPointData so custom extents can be stored directly in point metadata.
  • ISparklinesData now implements Iterable<DataPoint> and requires padding and supportsPointExtents.
  • BetweenLineData iterates its from points followed by its to points but disables point-extent fitting.

Migration

• Improved pubspec.yaml
• Fixed lint warnings

• DataPointPipeline
  • stack({ offset?, spacing? }) — Added offset to set the initial stacked base for each x (default 0.0).

• DataPointPipeline
  • sort({ x?, y?, fy? }) — Sort input by x, y, and/or fy. Each flag: true = ascending, false = descending. If all null, sorts by x ascending.
  • aggregate({ function?, window? }) — Aggregate dy over a window ending at each point. DataAggregation: sum, avg, min, max, median, std. window: null = cumulative from start, N = last N elements. Updates dy and fy per point.

• rescale — Rescale now transforms full intervals [y..fy] from source to target bounds; both y and fy are mapped, and dy is set to fy - y. Non-finite currentMin/currentMax are derived from input interval bounds.

• Added rescale to DataPointPipeline

• Added trailingSpacing and spacingDeg to DataPointPipeline

• Made the radius and thickness properties in PieData uniform by default, consistent with LineData and BarData
  • Use RelativeLayout(.., relativeTo: RelativeDimension.width) to make them relative again

• Fixed CircleArcBuilder for angles >= 2 * pi

• Fixed LayoutData min/max assert

• Fixed drawing DataPoints in CircleDataPointRenderer

• Added ChartFlip — none, vertically, horizontally, both. Flip charts around axes; available on all chart data types via ISparklinesData.flip.

• Renaming
  • LineChart.points => line
  • PieChart.points => pies
• Added IDataPointBorder and DataPointBorder
• Refactoring

• DataPoint
  • added IDataPointData
    • DataPointMeta
    • ThresholdPoints
  • migrated everything to DataPoint.data
• DataPointPipeline
  • refactored
  • tests

• DataPoint
  • added dx
  • removed getYorDy
• DataPointPipeline
  • fixes and tests
• PieData
  • renamed space to dx
  • added padAngle

• Initial release