drafter 0.2.0

A premium, dependency-free Flutter charting library with ~27 chart types, smooth Catmull-Rom curves, soft gradient fills and a left-to-right reveal.

Changelog

0.2.0

Added

• ScatterPlot.values(values: [(x, y), …]) — a values-first convenience constructor matching the line/area/bar charts.
• package:drafter/painting.dart — a dedicated entrypoint for the chart-authoring extension API (ChartRenderer, ChartCanvas, layout math, smooth-graphics helpers), keeping the main drafter.dart namespace focused on charts/data/theme.

Changed (breaking)

• The low-level drawing/layout helpers (smoothPath, trimPath, drawChartText, ChartBounds, RadialLayout, HAlign/VAlign, etc.) are no longer exported from package:drafter/drafter.dart — import package:drafter/painting.dart instead. The everyday chart widgets, data models and theming are unchanged.

Fixed

• BubbleChart no longer crashes (debug assert via a non-finite Offset) when every bubble shares a zero on an axis.
• DrafterThemeColors ==/hashCode now include the palette, so a palette-only theme change correctly repaints the charts.
• colorAt falls back instead of throwing on an empty palette.
• ChartCanvas now picks up a changed duration on rebuild.

Performance

• Static label text is cached (TextPainters are no longer re-shaped every animation frame), the painter repaints off the animation listenable inside a RepaintBoundary, line charts compute path metrics once per frame instead of twice, and the stream graph no longer builds its top spline twice per band.

0.1.0

Initial release — a premium, dependency-free Flutter charting library, a faithful port of the Compose/SwiftUI Drafter charts.

• ~27 chart types across one shared core: line, grouped line, stacked line, area, step line, simple/grouped/stacked bar, histogram, waterfall, pie, donut, radar, polar area, gauge, scatter, bubble, heatmap, funnel, bullet, box plot, treemap, sunburst, sankey, gantt, stream graph and candlestick.
• Renderer architecture: every chart is a pure ChartRenderer drawing into a Canvas, hosted by a thin widget over shared data models, axis/radial math, Catmull-Rom smooth graphics and a left-to-right reveal animation.
• DrafterTheme / DrafterThemeColors for light/dark palettes — a calm, premium color set (no harsh red).
• Built-in semantics: each chart exposes an accessibility label and value.