child property
A widget, which is to be used as the pointer.
You can set any custom widget as pointer to point a value in the gauge scale.
Defaults to null.
Widget build(BuildContext context) {
   return Container(
       child: SfRadialGauge(
         axes:<RadialAxis>[RadialAxis(
            pointers: <GaugePointer>[WidgetPointer(value: 50,
             widget: Container( height: 30, width: 30,
                  decoration: BoxDecoration(
                    shape: BoxShape.circle,
                    border: Border.all(color: Colors.red)),
                      child: Icon( Icons.check, color: Colors.black ))
            )],
           )]
       ));
}
Implementation
@override
final Widget child;