场景就是普通的Widget，我们来看下GameScene类的定义：

class GameScene extends StatefulWidget {
  final int map;

  GameScene({this.map = 1});

  @override
  _GameSceneState createState() => _GameSceneState();
}

class _GameSceneState extends State with TickerProviderStateMixin {
  
  /// 创建主场景
  _GameSceneState();

  /// 初始化状态
  @override
  void initState() {
    super.initState();

    /// 强制横屏
    SystemChrome.setPreferredOrientations(
        [DeviceOrientation.landscapeLeft, DeviceOrientation.landscapeRight]);

  }

  
  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(builder: (context, constraints) {
      return Stack(fit: StackFit.expand, children:[
        
        Positioned(
          left: 20,
          top: MediaQuery.of(context).padding.top + 20,
          child: Text(
            "Devilf",
            style: TextStyle(
              color: Colors.white,
              fontSize: 14,
            ),
          ),
        ),
       
      ]);
    });
  }
}

在main.dart其中这个场景：

main() async {
  /// 游戏场景
  GameScene gameScene = GameScene();

  /// 运行游戏
  runApp(MyApp(gameScene));
}

/// 主控件
class MyApp extends StatelessWidget {
  GameScene _gameScene;

  MyApp(this._gameScene);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Devilf',
      theme: ThemeData(
        primarySwatch: Colors.deepOrange,
      ),
      home: Scaffold(
        body: _gameScene,
      ),
    );
  }
}