graph.dart

class ExponentialCurve extends StatefulWidget {
  final List<charts.Series<DataPoint, int>> lst;
  ExponentialCurve(this.lst);

  @override
  _ExponentialCurveState createState() => _ExponentialCurveState();
}

class _ExponentialCurveState extends State<ExponentialCurve> {

  @override
  Widget build(BuildContext context) {
    return RepaintBoundary(child: charts.LineChart(this.widget.lst, animate: true,));
  }
}