add depth scene snapshot example

Author: António Valente

example/ios/Runner/AppDelegate.swift

@@ -1,7 +1,7 @@
 import Flutter
 import UIKit
 
-@UIApplicationMain
+@main
 @objc class AppDelegate: FlutterAppDelegate {
     override func application(
         _ application: UIApplication,

example/lib/main.dart

@@ -17,6 +17,7 @@ import 'package:arkit_plugin_example/network_image_detection.dart';
 import 'package:arkit_plugin_example/occlusion_page.dart';
 import 'package:arkit_plugin_example/physics_page.dart';
 import 'package:arkit_plugin_example/plane_detection_page.dart';
+import 'package:arkit_plugin_example/snapshot_depth_scene.dart';
 import 'package:arkit_plugin_example/snapshot_scene.dart';
 import 'package:arkit_plugin_example/tap_page.dart';
 import 'package:arkit_plugin_example/face_detection_page.dart';
@@ -214,6 +215,13 @@ class MyApp extends StatelessWidget {
         () => Navigator.of(context).push<void>(
             MaterialPageRoute(builder: (c) => CameraPropertiesPage())),
       ),
+      Sample(
+        'Depth Scene Snapshot',
+        'Make a photo of the depth scene using LiDAR',
+        Icons.camera,
+        () => Navigator.of(context).push<void>(
+            MaterialPageRoute(builder: (c) => SnapshotDepthScenePage())),
+      ),
     ];
 
     return Scaffold(

example/lib/snapshot_depth_scene.dart

@@ -0,0 +1,141 @@
+import 'package:arkit_plugin/arkit_plugin.dart';
+import 'package:arkit_plugin_example/util/ar_helper.dart';
+import 'package:flutter/material.dart';
+
+import 'dart:math' as math;
+
+class SnapshotDepthScenePage extends StatefulWidget {
+  @override
+  _SnapshotDepthScenePageState createState() => _SnapshotDepthScenePageState();
+}
+
+class _SnapshotDepthScenePageState extends State<SnapshotDepthScenePage> {
+  late ARKitController arkitController;
+
+  @override
+  void dispose() {
+    arkitController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) => Scaffold(
+      appBar: AppBar(
+        title: const Text('Snapshot'),
+      ),
+      floatingActionButton: FloatingActionButton(
+        child: Icon(Icons.camera_alt),
+        onPressed: () async {
+          try {
+            final data = await arkitController.snapshotWithDepthData();
+            if (data == null) return;
+            final image = data['image']! as MemoryImage;
+            final depthData = (data..remove('image')).map<String, String>(
+              (key, value) => MapEntry(key, value.toString()),
+            );
+            await Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (context) => SnapshotPreview(
+                  imageProvider: image,
+                  depthData: depthData,
+                ),
+              ),
+            );
+          } catch (e) {
+            print(e);
+          }
+        },
+      ),
+      body: Container(
+        child: ARKitSceneView(
+          configuration: ARKitConfiguration.depthTracking,
+          onARKitViewCreated: onARKitViewCreated,
+        ),
+      ));
+
+  void onARKitViewCreated(ARKitController arkitController) {
+    this.arkitController = arkitController;
+    this.arkitController.add(createSphere());
+  }
+}
+
+class SnapshotPreview extends StatelessWidget {
+  const SnapshotPreview({
+    Key? key,
+    required this.imageProvider,
+    required this.depthData,
+  }) : super(key: key);
+
+  final ImageProvider imageProvider;
+  final Map<String, String> depthData;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Image Preview'),
+        actions: [
+          IconButton(
+            icon: Icon(Icons.info),
+            onPressed: () => Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (context) => DepthDataPreview(
+                  depthData: depthData,
+                ),
+              ),
+            ),
+          )
+        ],
+      ),
+      body: Stack(
+        fit: StackFit.expand,
+        children: [
+          Transform.rotate(
+            angle: 90 * math.pi / 180,
+            child: Image(image: imageProvider),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class DepthDataPreview extends StatelessWidget {
+  const DepthDataPreview({
+    Key? key,
+    required this.depthData,
+  }) : super(key: key);
+
+  final Map<String, String> depthData;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Depth Data Preview'),
+      ),
+      body: ListView(
+        children: [
+          ListTile(
+            title: Text('Depth Width'),
+            subtitle: Text(depthData['depthWidth']!),
+          ),
+          ListTile(
+            title: Text('Depth Height'),
+            subtitle: Text(depthData['depthHeight']!),
+          ),
+          ListTile(
+            title: Text('Intrinsics'),
+            subtitle: Text(depthData['intrinsics']!),
+          ),
+          ListTile(
+            title: Text('Depth Map'),
+            subtitle: Text(depthData['depthMap']!),
+          ),
+        ],
+      ),
+    );
+  }
+}