borderRadius property

Customizes the corners of the waterfall.

Each corner can be customized with a desired value or with a single value.

Defaults to Radius.zero.

Widget build(BuildContext context) {
  return SfCartesianChart(
    series: <WaterfallSeries<SalesData, num>>[
      WaterfallSeries<SalesData, num>(
        borderRadius: BorderRadius.circular(5),
      ),
    ],
  );
}