feat: Make Viewfinder and Viewport comply with CoordinateTransform in…

…terface (#2872)

Make `Viewfinder` and `Viewport` comply with `CoordinateTransform`
interface; they already perform the coordinate transform operation but
didn't technically implement then interface.

packages/flame/lib/src/camera/viewfinder.dart

@@ -1,9 +1,7 @@
 import 'dart:math';
 
+import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
-import 'package:flame/src/anchor.dart';
-import 'package:flame/src/camera/camera_component.dart';
-import 'package:flame/src/components/core/component.dart';
 import 'package:flame/src/effects/provider_interfaces.dart';
 import 'package:flame/src/game/transform2d.dart';
 import 'package:meta/meta.dart';
@@ -18,7 +16,12 @@ import 'package:meta/meta.dart';
 /// If you add children to the [Viewfinder] they will appear like HUDs i.e.
 /// statically in front of the world.
 class Viewfinder extends Component
-    implements AnchorProvider, AngleProvider, PositionProvider, ScaleProvider {
+    implements
+        AnchorProvider,
+        AngleProvider,
+        PositionProvider,
+        ScaleProvider,
+        CoordinateTransform {
   /// Transform matrix used by the viewfinder.
   final Transform2D transform = Transform2D();
 
@@ -180,6 +183,16 @@ class Viewfinder extends Component
     }
   }
 
+  @override
+  Vector2 parentToLocal(Vector2 point) {
+    return globalToLocal(point);
+  }
+
+  @override
+  Vector2 localToParent(Vector2 point) {
+    return localToGlobal(point);
+  }
+
   @override
   void onGameResize(Vector2 size) {
     _updateZoom();

packages/flame/lib/src/camera/viewport.dart

@@ -1,9 +1,7 @@
+import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
 import 'package:flame/game.dart';
-import 'package:flame/src/anchor.dart';
-import 'package:flame/src/camera/camera_component.dart';
 import 'package:flame/src/camera/viewports/fixed_resolution_viewport.dart';
-import 'package:flame/src/components/core/component.dart';
 import 'package:flame/src/effects/provider_interfaces.dart';
 import 'package:meta/meta.dart';
 
@@ -21,7 +19,11 @@ import 'package:meta/meta.dart';
 /// A viewport establishes its own local coordinate system, with the origin at
 /// the top left corner of the viewport's bounding box.
 abstract class Viewport extends Component
-    implements AnchorProvider, PositionProvider, SizeProvider {
+    implements
+        AnchorProvider,
+        PositionProvider,
+        SizeProvider,
+        CoordinateTransform {
   Viewport({super.children});
 
   final Vector2 _size = Vector2.zero();
@@ -148,6 +150,16 @@ abstract class Viewport extends Component
     return (output?..setValues(x, y)) ?? Vector2(x, y);
   }
 
+  @override
+  Vector2 parentToLocal(Vector2 point) {
+    return globalToLocal(point);
+  }
+
+  @override
+  Vector2 localToParent(Vector2 point) {
+    return localToGlobal(point);
+  }
+
   void transformCanvas(Canvas canvas) {
     canvas.transform2D(transform);
   }