animated-donut-chart-06

donut-chart-painter.dart

void drawLabels(Canvas canvas, Offset c, double radius, double startAngle,
    double sweepAngle, String label) {
  final r = radius * 0.4;
  final dx = r * cos(startAngle + sweepAngle / 2.0);
  final dy = r * sin(startAngle + sweepAngle / 2.0);
  final position = c + Offset(dx, dy);
  drawTextCentered(canvas, position, label, labelStyle, 100.0, (Size sz) {
    final rect = Rect.fromCenter(
        center: position, width: sz.width + 5, height: sz.height + 5);
    final rrect = RRect.fromRectAndRadius(rect, Radius.circular(5));
    canvas.drawRRect(rrect, midPaint);
  });
}