Flutter for Beginners

Overriding the paint method

The paint method is responsible for drawing our chart. This is how we define it:

// part of pie_chart.dart file PieChartPainter class  @override  void paint(Canvas canvas, Size size) {    var center = Offset(size.width / 2, size.height / 2);    var radius = (size.width * 0.75) / 2;    Rect chartRect = Rect.fromCircle(      center: center,      radius: radius,    );    int total = values.reduce((a, b) => a + b);    _paintCircle(canvas, total, chartRect);  }

Let's break it down:

1. First, we need to define our pie extensions. With the given size parameter, we can set the center of our chart and the radius, which is half of 75 percent of the available space, (var radius = (size.width * 0.75) / 2;), to preserve some space around the chart.
2. Then, we ...