如何使用flutter绘制此形状

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

class CustomShape extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: ShapePainter(),
    );
  }
}

class ShapePainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    // 在canvas上绘制形状
    // 使用canvas的绘图方法绘制所需的形状，例如绘制线条、矩形、圆形等
  }

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

class ShapePainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint()
      ..color = Colors.blue
      ..strokeWidth = 2.0
      ..style = PaintingStyle.fill;

    // 绘制一个矩形
    Rect rect = Rect.fromLTWH(50, 50, 200, 100);
    canvas.drawRect(rect, paint);

    // 绘制一个圆形
    Offset center = Offset(200, 200);
    canvas.drawCircle(center, 50, paint);

    // 绘制其他形状，如线条、多边形等
  }

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Custom Shape'),
        ),
        body: Center(
          child: CustomShape(),
        ),
      ),
    );
  }
}