Receipt clipper showing making some cuts in a widget

receipt_clipper.dart

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      darkTheme: ThemeData.dark(),
      theme: ThemeData.light(),
      home: const MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter app'),
      ),
      body: Column(
        children: [
          ClipPath(
            clipper: ReceiptClipper(),
            child: Container(
              padding: const EdgeInsets.all(40),
              alignment: Alignment.topCenter,
              width: 300,
              height: 600,
              decoration: BoxDecoration(
                  color: Theme.of(context).backgroundColor,
                  borderRadius: BorderRadius.circular(12)),
            ),
          )
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          print('Zapp!');
        },
        backgroundColor: Colors.yellow[700],
        child: Icon(
          Icons.bolt,
          color: Colors.black,
        ),
      ),
    );
  }
}

class ReceiptClipper extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    double yPosition = size.height / 3;
    Path path = Path()
      ..moveTo(0, 0)
      ..lineTo(0, yPosition)
      ..quadraticBezierTo(20, yPosition + 15, 0, yPosition + 30)
      ..lineTo(0, size.height)
      ..lineTo(size.width, size.height)
      ..lineTo(size.width, yPosition + 30)
      ..quadraticBezierTo(
          size.width - 20, yPosition + 15, size.width, yPosition)
      ..lineTo(size.width, 0)
      ..close();

    return path;
  }

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) {
    return false;
  }
}