import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: const MyHomePage());
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Custom Paint widget with 3.29.0 :'),
            CustomPaint(painter: MyCustomPainter(), size: const Size(100, 100)),
          ],
        ),
      ),
    );
  }
}

class MyCustomPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    double radius = size.longestSide / 2 - 15.0;

    final center = Offset(size.longestSide / 2, size.longestSide / 2);

    canvas.drawCircle(center, radius, Paint()..color = Colors.grey);

    TextPainter painter = TextPainter(textDirection: TextDirection.ltr);
    painter.text = TextSpan(
      text: "test",
      style: TextStyle(
        fontSize: radius * 2 / 3,
        color: Colors.black,
      ),
    );
    painter.layout();
    canvas.save();
    final offset = Offset(
      center.dx - painter.width / 2,
      center.dy - painter.height / 2,
    );
    final pivot = painter.size.center(offset);
    canvas.translate(pivot.dx, pivot.dy);
    canvas.rotate(pi);
    canvas.translate(-pivot.dx, -pivot.dy);
    painter.paint(canvas, offset);
    canvas.restore();
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return false;
  }
}