onMarkerRender property Null safety

ChartMarkerRenderCallback? onMarkerRender
final

Occurs when the marker is rendered. Here, you can get the marker pointIndex shape, height and width of data markers.

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
              onMarkerRender: (MarkerRenderArgs markerargs)
           {
             if(markerargs.pointIndex==2)
             {
             markerargs.markerHeight=20.0;
             markerargs.markerWidth=20.0;
             markerargs.shape=DataMarkerType.triangle;
             }
           },
       ));
}

Implementation

final ChartMarkerRenderCallback? onMarkerRender;