✨ New Features #

• Gradient link rendering - Links now use LinearGradient shaders for smooth color transitions between source and target nodes
• Texture overlay - Added showTexture parameter for subtle texture patterns on links, enhancing visual depth
• Node selection callback - New onNodeSelected(SankeyNode?) callback provides the full node object on tap
• Display label fallback - SankeyNode.displayLabel getter returns label or falls back to id.toString()

🛠 Enhancements #

• HSL-based selection borders - Selected nodes display contrasting borders using intelligent HSL color manipulation
• Clearer field names - Renamed node position fields from x0/x1/y0/y1 to left/right/top/bottom
• Efficient hit testing - Added SankeyNode.contains(Offset) method for cleaner tap detection
• Subtle node borders - Unselected nodes show subtle white borders for better visual definition
• Repaint fix - shouldRepaint now correctly triggers for selectedNodeId, showLabels, and showTexture changes
• Responsive example - Example app uses LayoutBuilder to adapt to screen size

⚠️ Breaking Changes #

• Removed deprecated onNodeTap(int?) callback — use onNodeSelected(SankeyNode?) instead

🔧 Internal #

• Migrated deprecated withOpacity() calls to withAlpha()
• Type safety - SankeyLink.source and SankeyLink.target are now strongly typed as SankeyNode
• Consistent naming - Renamed Sankey layout bounds from x0/y0/x1/y1 to leftBound/topBound/rightBound/bottomBound
• Widget tests - Added comprehensive tests for SankeyDiagramWidget, node detection, and color mapping

Contributor: @jheyne — gradient rendering implementation

✨ New Features #

• Label toggle - Added showLabels boolean parameter to InteractiveSankeyPainter to show/hide node labels
• Exposed showLabels through buildInteractiveSankeyPainter() and SankeyDiagramWidget

🛠 Enhancements #

• Label rendering respects the showLabels flag during painting
• Improved flexibility for minimal or uncluttered diagram visuals

Contributor: @pese-git — showLabels feature

🎉 Initial Release #

• Fully featured Sankey layout engine adapted from d3-sankey
• Customizable node width, padding, and alignment
• Interactive node selection with tap detection
• Test fixture parity with d3's energy.json example

Contributors #

A huge thank you to our community contributors: