backgroundImage property Null safety

ImageProvider<Object>? backgroundImage

The background image of the RadialAxis. Changing the image will set the background to the new image.

The backgroundImage applied for the RadialAxis boundary.

This property is a type of ImageProvider. Therefore, you can set the following types of image on this.

Defaults to null.

Widget build(BuildContext context) {
   return Container(
       child: SfRadialGauge(
          backgroundImage: AssetImage('images/dark_background.png')


final ImageProvider? backgroundImage;