如何在flutter中变换矩形，如本例所示？

import 'package:flutter/material.dart';

class RectangleTransform extends StatefulWidget {
  @override
  _RectangleTransformState createState() => _RectangleTransformState();
}

class _RectangleTransformState extends State<RectangleTransform> {
  double _scale = 1.0;
  double _rotation = 0.0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Rectangle Transformation'),
      ),
      body: Center(
        child: Transform.scale(
          scale: _scale,
          child: Transform.rotate(
            angle: _rotation,
            child: Container(
              width: 200,
              height: 100,
              color: Colors.blue,
            ),
          ),
        ),
      ),
      floatingActionButton: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          FloatingActionButton(
            onPressed: () {
              setState(() {
                _scale = (_scale == 1.0) ? 2.0 : 1.0;
              });
            },
            child: Icon(Icons.zoom_out_map),
          ),
          SizedBox(height: 16),
          FloatingActionButton(
            onPressed: () {
              setState(() {
                _rotation += 0.5;
              });
            },
            child: Icon(Icons.rotate_right),
          ),
        ],
      ),
    );
  }
}