yValueMapper property

@override ChartIndexedValueMapper<num>? yValueMapper

Maps the field name, which will be considered as y-values.

Defaults to null

Widget build(BuildContext context) {
   return Container(
       child: SfPyramidChart(
           series: PyramidSeries<ChartData, String>(
               dataSource: <ChartData>[
                  ChartData('USA', 10),
                  ChartData('China', 11),
                  ChartData('Russia', 9),
                  ChartData('Germany', 10),
               ],
               yValueMapper: (ChartData data, _) => data.yVal,
             )],
       ));
}
class ChartData {
  ChartData(this.xVal, this.yVal);
  final String xVal;
  final int yVal;
}

Implementation

@override
final ChartIndexedValueMapper<num>? yValueMapper;