hyzp_ybqx-Commit001：代码刚转换好，编译通过

lib/my_flutterPtControl/example/lib/main.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/material.dart';
+import 'package:flutterptcontrol/flutterptcontrol.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatefulWidget {
+  @override
+  _MyAppState createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  final double _outerRadius = 99;
+  final double _innerRadius = 99 / 2;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: Text('云台方向按钮widget'),
+        ),
+        body: Center(
+          child: SizedBox(
+            width: 2 * _outerRadius,
+            height: 2 * _outerRadius,
+            child: PtControlWidget(
+                innerRadius: _innerRadius,
+                outerRadius: _outerRadius,
+                callback: (status) {
+                  print('status = $status');
+                }),
+          ),
+        ),
+      ),
+    );
+  }
+}