xtal_dataview 0.5.0

A comprehensive Flutter charting library with Area, Bar, Column, Heatmap, Sunburst, Dual-Axes, and Horizontal Bar charts. Features interactive tooltips, smooth animations, and customizable themes.

0.5.0

• Add showValueLabels and valueLabelFormatter parameters to BarChart, ColumnChart, and DualAxesChart for displaying aggregate values above bars.
  • ColumnChart stacked mode shows the total sum above each stack.
  • DualAxesChart supports per-axis formatters (leftValueLabelFormatter / rightValueLabelFormatter).
  • New barValueLabelStyle theme property for styling vertical bar value labels.
• Add SunburstCenterDisplayMode enum to SunburstChart for toggling center display between nameAndValue (default) and valueOnly.
• Add yAxisLabelAlignment parameter to HeatmapChart for controlling Y-axis label text alignment (TextAlign.left / center / right).
• Fix HeatmapChart Y-axis labels being truncated: left padding now dynamically adjusts to fit the widest label.

0.4.0

• Update default color system to a unified design palette.
  • Sunburst chart: replace 21-color palette with a curated 12-color palette (Blue, Red, Neon Mint, Gray, Purple, Amber, Teal, Pink, Sky, Coral, Violet, Gold).
  • Heatmap chart: upgrade default gradient from 2-stop to 9-step Blue scale for smoother color distribution.
  • Calendar heatmap: align Sunday/Saturday colors with the new Red/Blue palette.
• Make tooltip value fontWeight controllable via tooltipValueStyle theme property (previously hardcoded to bold in each chart).

0.3.7

• Add missing CrossAxisAlignment.stretch to legend layout Column/Row in ColumnChart (same fix applied to SunburstChart in 0.3.6).
• Add showColorLegend parameter to HeatmapChart to toggle the gradient color legend bar (default true).

0.3.6

• Remove LayoutBuilder from all 8 chart widgets for significantly improved resize performance.
• Fix SunburstChart not rendering when showLegend is enabled (missing CrossAxisAlignment.stretch on internal Column/Row).
• Add resize performance test page to example app with width/height sliders and performance overlay toggle.

0.3.5

• Add topPadding parameter to all chart widgets to control the space above the chart drawing area (default 0). Previously, a hardcoded 16px top padding was always applied.

0.3.4

• Add rotateXAxisLabels parameter to ColumnChart and DualAxesChart for vertical (-90°) X-axis label display.

0.3.3

• Add showAllXAxisLabels parameter to ColumnChart and DualAxesChart for disabling automatic label thinning.

0.3.2

• Make CalendarHeatmap responsive: automatically adapts to bounded height constraints using LayoutBuilder instead of requiring a fixed minimum height.

0.3.1

• Add showAllXAxisLabels parameter to BarChart for disabling automatic label thinning.

0.3.0

• BREAKING: Rename package from crystal_charts to xtal_dataview. Update your imports to package:xtal_dataview/xtal_dataview.dart.
• Add unit, unitPosition, valueScale, useThousandsSeparator parameters to SunburstChart.
• Add centerBackButtonColor, centerLabelStyle, centerValueStyle parameters to SunburstChart for center back button customization.

0.2.1

• Add legend support (showLegend, legendPosition) to ColumnChart.
• Add dynamic Y-axis label width to ColumnChart (no more truncation with …).
• Fix SunburstChart unnecessary re-animation by adding value equality (==/hashCode) to ChartTreeNode.
• Dismiss tooltip when tapping outside the chart area on all chart types.

0.2.0

• Add tap-based tooltip and highlight for all chart types on iOS/touch devices.
• Fix BarChart hit test accuracy by passing full layout parameters (yScale, unit, valueScale, etc.).
• Add TextDecoration.none to tooltip text styles to prevent unwanted underlines on iOS.

0.1.3

• Add dynamic axis label sizing and X-axis label rotation for BarChart.

0.1.2

• Change calendar heatmap month selector labels from English abbreviations (Jan–Dec) to numeric (1–12).

0.1.1

• Fix axis title and axis label overlap on all chart types.
• Fix axis labels wrapping to multiple lines (enforce single-line rendering).
• Fix DualAxes right Y-axis title overlapping with labels.
• Increase axis title padding (20px → 24px) and X-axis title offset (22px → 26px).

0.1.0

• Initial release.
• Area Chart — Gradient-filled area chart with smooth curve support.
• Bar Chart — Grouped vertical bar chart.
• Column Chart — Column chart with grouping and stacking support.
• Dual Axes Chart — Dual-axis chart with independent left/right Y axes (line / area / column).
• Heatmap Chart — Category-by-category heatmap with color scale legend.
• Horizontal Bar Chart — Horizontal bar chart.
• Sunburst Chart — Sunburst chart with drill-down support.
• Calendar Heatmap — High-performance calendar heatmap based on Canvas (CustomPainter).
• Common features: Hover tooltips, animations, customizable themes (light/dark), value formatter (unit, scaling, thousands separator).