Fixed CameraPreview aspect ratio

Probably will be changed in future, is it currently relies on the `ResolutionPreset` being tied with aspect ratio

.vscode/launch.json

@@ -5,12 +5,26 @@
     "version": "0.2.0",
     "configurations": [
         {
-            "name": "dev",
+            "name": "dev (android)",
             "request": "launch",
             "type": "dart",
             "args": [
                 "--flavor",
                 "dev",
+                "--dart-define",
+                "cameraPreviewAspectRatio=2/3",
+            ],
+            "program": "${workspaceFolder}/lib/main.dart",
+        },
+        {
+            "name": "dev (ios)",
+            "request": "launch",
+            "type": "dart",
+            "args": [
+                "--flavor",
+                "dev",
+                "--dart-define",
+                "cameraPreviewAspectRatio=3/4",
             ],
             "program": "${workspaceFolder}/lib/main.dart",
         },
@@ -21,16 +35,32 @@
             "args": [
                 "--flavor",
                 "dev",
+                "--dart-define",
+                "cameraPreviewAspectRatio=3/4",
             ],
             "program": "${workspaceFolder}/lib/main_mock.dart",
         },
         {
-            "name": "prod",
+            "name": "prod (android)",
             "request": "launch",
             "type": "dart",
             "args": [
                 "--flavor",
                 "prod",
+                "--dart-define",
+                "cameraPreviewAspectRatio=2/3",
+            ],
+            "program": "${workspaceFolder}/lib/main.dart",
+        },
+        {
+            "name": "prod (ios)",
+            "request": "launch",
+            "type": "dart",
+            "args": [
+                "--flavor",
+                "prod",
+                "--dart-define",
+                "cameraPreviewAspectRatio=3/4",
             ],
             "program": "${workspaceFolder}/lib/main.dart",
         },

README.md

@@ -12,3 +12,10 @@ Some time ago I've started developing the [Material Lightmeter](https://play.goo
 But as the existing repo contained some sensitive data, that I've pushed due to lack of experience, I had to make a new one. And if creating a new repo, why not rewrite the app from scratch?)
 
 Without further delay behold my new Lightmeter app inspired by Material You (a.k.a. M3)
+
+## Build
+
+```
+flutter build apk --flavor dev --dart-define cameraPreviewAspectRatio=2/3
+flutter build apk --flavor dev --dart-define cameraPreviewAspectRatio=2/3 
+```

lib/platform_config.dart

@@ -0,0 +1,6 @@
+class PlatformConfig {
+  static double get cameraPreviewAspectRatio {
+    final rational = const String.fromEnvironment('cameraPreviewAspectRatio', defaultValue: "3/4").split('/');
+    return int.parse(rational[0]) / int.parse(rational[1]);
+  }
+}

lib/screens/metering/components/topbar/components/widget_camera_preview.dart

@@ -2,6 +2,7 @@ import 'package:camera/camera.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:lightmeter/platform_config.dart';
 import 'package:lightmeter/screens/metering/ev_source/camera/bloc_camera.dart';
 import 'package:lightmeter/screens/metering/ev_source/camera/state_camera.dart';
 
@@ -11,25 +12,27 @@ class CameraView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return AspectRatio(
-      aspectRatio: 3 / 4,
-      child: BlocBuilder<CameraBloc, CameraState>(
-        buildWhen: (previous, current) => current is CameraInitializedState,
-        builder: (context, state) {
-          if (state is CameraInitializedState) {
-            final value = state.controller.value;
-            return ValueListenableBuilder<CameraValue>(
-              valueListenable: state.controller,
-              builder: (_, __, ___) => AspectRatio(
-                aspectRatio: _isLandscape(value) ? value.aspectRatio : (1 / value.aspectRatio),
-                child: RotatedBox(
-                  quarterTurns: _getQuarterTurns(value),
-                  child: state.controller.buildPreview(),
+      aspectRatio: PlatformConfig.cameraPreviewAspectRatio,
+      child: Center(
+        child: BlocBuilder<CameraBloc, CameraState>(
+          buildWhen: (previous, current) => current is CameraInitializedState,
+          builder: (context, state) {
+            if (state is CameraInitializedState) {
+              final value = state.controller.value;
+              return ValueListenableBuilder<CameraValue>(
+                valueListenable: state.controller,
+                builder: (_, __, ___) => AspectRatio(
+                  aspectRatio: _isLandscape(value) ? value.aspectRatio : (1 / value.aspectRatio),
+                  child: RotatedBox(
+                    quarterTurns: _getQuarterTurns(value),
+                    child: state.controller.buildPreview(),
+                  ),
                 ),
-              ),
-            );
-          }
-          return const ColoredBox(color: Colors.black);
-        },
+              );
+            }
+            return const ColoredBox(color: Colors.black);
+          },
+        ),
       ),
     );
   }