feat: multipliers controller

lib/game/components/components.dart

@@ -3,6 +3,7 @@ export 'board.dart';
 export 'camera_controller.dart';
 export 'controlled_ball.dart';
 export 'controlled_flipper.dart';
+export 'controlled_multiplier.dart';
 export 'controlled_plunger.dart';
 export 'flutter_forest.dart';
 export 'game_flow_controller.dart';

lib/game/components/controlled_multiplier.dart

@@ -0,0 +1,49 @@
+import 'package:flame/components.dart';
+import 'package:pinball/game/game.dart';
+import 'package:pinball/game/pinball_game.dart';
+import 'package:pinball_components/pinball_components.dart';
+import 'package:pinball_flame/pinball_flame.dart';
+
+/// {@template multipliers_group_component}
+/// A [SpriteGroupComponent] for the multiplier over the board.
+/// {@endtemplate}
+class MultipliersGroup extends Component
+    with Controls<_MultipliersController>, HasGameRef<PinballGame> {
+  /// {@macro multipliers_group_component}
+  MultipliersGroup()
+      : super(
+          children: [
+            MultiplierSpriteGroupComponent(
+              position: Vector2(-20, 0),
+              onAssetPath: Assets.images.multiplier.x2.active.keyName,
+              offAssetPath: Assets.images.multiplier.x2.inactive.keyName,
+            ),
+            MultiplierSpriteGroupComponent(
+              position: Vector2(20, -5),
+              onAssetPath: Assets.images.multiplier.x3.active.keyName,
+              offAssetPath: Assets.images.multiplier.x3.inactive.keyName,
+            ),
+            MultiplierSpriteGroupComponent(
+              position: Vector2(0, -15),
+              onAssetPath: Assets.images.multiplier.x4.active.keyName,
+              offAssetPath: Assets.images.multiplier.x4.inactive.keyName,
+            ),
+            MultiplierSpriteGroupComponent(
+              position: Vector2(-10, -25),
+              onAssetPath: Assets.images.multiplier.x5.active.keyName,
+              offAssetPath: Assets.images.multiplier.x5.inactive.keyName,
+            ),
+            MultiplierSpriteGroupComponent(
+              position: Vector2(10, -35),
+              onAssetPath: Assets.images.multiplier.x6.active.keyName,
+              offAssetPath: Assets.images.multiplier.x6.inactive.keyName,
+            ),
+          ],
+        );
+}
+
+class _MultipliersController extends ComponentController<MultipliersGroup>
+    with HasGameRef<PinballGame> {
+  _MultipliersController(MultipliersGroup multipliersGroup)
+      : super(multipliersGroup);
+}