Flutter for Beginners

Defining a widget

The RadialChart widget is very similar to the PieChart widget defined before, with the same parameters and the same fundamental objective. The only thing we need to take a look at here is its build() method:

// part of radial_chart.dart RadialChart widget  @override  Widget build(BuildContext context) {    return Row(      children: <Widget>[        Expanded(          child: CustomPaint(            painter: RadialChartPainter(              values,              colors,              Theme.of(context).textTheme.display1,              Directionality.of(context),            ),          ),        ),      ],    );  }

As you can see, the difference is in the value passed to the painter property of the CustomPaint widget. Here, we use a new RadialChartPainter class that has its own paint() implementation. Besides the values and colors, we pass two additional ...