pointColorMapper property Null safety

ChartIndexedValueMapper<Color>? pointColorMapper
final

Maps the field name, which will be considered as data point color.

Defaults to null.

Widget build(BuildContext context) {
   return Container(
       child: SfCircularChart(
           series: <PieSeries<ChartData, String>>[
             PieSeries<ChartData, String>(
               dataSource: <ChartData>[
                  ChartData('USA', 10, Colors.red),
                  ChartData('China', 11, Colors.green),
                  ChartData('Russia', 9, Colors.blue),
                  ChartData('Germany', 10, Colors.voilet),
               ],
               xValueMapper: (ChartData data, _) => data.xVal,
               yValueMapper: (ChartData data, _) => data.yVal,
               pointColorMapper: (ChartData data, _) => data.pointColor,
             ),
          ],
       )
   );
}
class ChartData {
  ChartData(this.xVal, this.yVal, [this.pointColor]);
  final String xVal;
  final int yVal;
  final Color pointColor;
}

Implementation

@override
final ChartIndexedValueMapper<Color>? pointColorMapper;