generateDefaultNodeColorMap function

Map<String, Color> generateDefaultNodeColorMap(List<SankeyNode> nodes)

Generates a default node color map for a list of SankeyNode objects

Each node's displayLabel is used to assign a color from defaultNodeColors in sequence (cycling through the palette). This is useful as a convenience method when no custom node colors are provided.

Returns a Map with the node's display label as key and the assigned Color as value

Implementation

Map<String, Color> generateDefaultNodeColorMap(List<SankeyNode> nodes) {
  final Map<String, Color> colorMap = {};
  for (int i = 0; i < nodes.length; i++) {
    final label = nodes[i].displayLabel;
    if (!colorMap.containsKey(label)) {
      colorMap[label] = defaultNodeColors[i % defaultNodeColors.length];
    }
  }
  return colorMap;
}