markerSettings property Null safety

MarkerSettings markerSettings

Indication of data points.

Mark the data point location with symbols for better indication. The shape, color, border, and size of the marker can be customized.

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           series: <LineSeries<ChartData, num>>[
                  LineSeries<ChartData, num>(
                      markerSettings: MarkerSettings(isVisible: true),


final MarkerSettings markerSettings;