lengthUnit property

Calculates the needle pointer length either in logical pixel or radius factor.

Using GaugeSizeUnit, needle pointer length is calculated.

Defaults to GaugeSizeUnit.factor.

Also refer GaugeSizeUnit.

Widget build(BuildContext context) {
   return Container(
       child: SfRadialGauge(
         axes:<RadialAxis>[RadialAxis
         ( pointers: <GaugePointer>[
            NeedlePointer( needleLength: 30,
            lengthUnit: GaugeSizeUnit.logicalPixel
          )])]
       ));
}