update example project

example/lib/camera_matrix_overlay.dart

@@ -0,0 +1,51 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_filament/filament_controller.dart';
+
+class CameraMatrixOverlay extends StatefulWidget {
+  final FilamentController controller;
+
+  CameraMatrixOverlay({super.key, required this.controller});
+
+  @override
+  State<StatefulWidget> createState() => _CameraMatrixOverlayState();
+}
+
+class _CameraMatrixOverlayState extends State<CameraMatrixOverlay> {
+  Timer? _cameraTimer;
+  String? _cameraPosition;
+  String? _cameraRotation;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _cameraTimer =
+        Timer.periodic(const Duration(milliseconds: 50), (timer) async {
+      var cameraPosition = await widget.controller.getCameraPosition();
+      var cameraRotation = await widget.controller.getCameraRotation();
+      _cameraPosition = cameraPosition.toString();
+      _cameraRotation = cameraRotation.toString();
+      setState(() {});
+    });
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    _cameraTimer?.cancel();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+        decoration: BoxDecoration(
+            color: Colors.black.withOpacity(0.5),
+            borderRadius: BorderRadius.circular(29)),
+        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 5),
+        child: Text("Camera position : $_cameraPosition $_cameraRotation",
+            style: const TextStyle(color: Colors.white, fontSize: 12)));
+  }
+}