feat: multiplier controller

lib/game/components/controlled_multiplier.dart

@@ -1,6 +1,7 @@
+import 'dart:math' as math;
 import 'package:flame/components.dart';
+import 'package:flame_bloc/flame_bloc.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';
 
@@ -10,40 +11,85 @@ import 'package:pinball_flame/pinball_flame.dart';
 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,
-            ),
-          ],
-        );
+  MultipliersGroup() : super() {
+    controller = _MultipliersController(this);
+  }
+
+  late final Multiplier _x2multiplier;
+
+  late final Multiplier _x3multiplier;
+
+  late final Multiplier _x4multiplier;
+
+  late final Multiplier _x5multiplier;
+
+  late final Multiplier _x6multiplier;
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+
+    _x2multiplier = Multiplier(
+      value: 2,
+      position: Vector2(-19.5, -2),
+      rotation: -15 * math.pi / 180,
+    );
+
+    _x3multiplier = Multiplier(
+      value: 3,
+      position: Vector2(13, -9.5),
+      rotation: 15 * math.pi / 180,
+    );
+
+    _x4multiplier = Multiplier(
+      value: 4,
+      position: Vector2(0, -21),
+    );
+
+    _x5multiplier = Multiplier(
+      value: 5,
+      position: Vector2(-8.5, -28),
+      rotation: -3 * math.pi / 180,
+    );
+
+    _x6multiplier = Multiplier(
+      value: 6,
+      position: Vector2(10, -31),
+      rotation: 8 * math.pi / 180,
+    );
+
+    await addAll([
+      _x2multiplier,
+      _x3multiplier,
+      _x4multiplier,
+      _x5multiplier,
+      _x6multiplier,
+    ]);
+  }
 }
 
 class _MultipliersController extends ComponentController<MultipliersGroup>
-    with HasGameRef<PinballGame> {
+    with BlocComponent<GameBloc, GameState>, HasGameRef<PinballGame> {
   _MultipliersController(MultipliersGroup multipliersGroup)
       : super(multipliersGroup);
+
+  @override
+  bool listenWhen(GameState? previousState, GameState newState) {
+    // TODO(ruimiguel): use here GameState.multiplier when merged
+    // https://github.com/VGVentures/pinball/pull/213.
+    return previousState?.score != newState.score;
+  }
+
+  @override
+  void onNewState(GameState state) {
+    // TODO(ruimiguel): use here GameState.multiplier when merged
+    // https://github.com/VGVentures/pinball/pull/213.
+    final currentMultiplier = state.score.bitLength % 6 + 1;
+
+    component._x2multiplier.toggle(currentMultiplier);
+    component._x3multiplier.toggle(currentMultiplier);
+    component._x4multiplier.toggle(currentMultiplier);
+    component._x5multiplier.toggle(currentMultiplier);
+    component._x6multiplier.toggle(currentMultiplier);
+  }
 }

lib/game/pinball_game.dart

@@ -55,6 +55,7 @@ class PinballGame extends Forge2DGame
     final launcher = Launcher();
     unawaited(addFromBlueprint(launcher));
     unawaited(add(Board()));
+    unawaited(add(MultipliersGroup()));
     unawaited(add(AlienZone()));
     await addFromBlueprint(SparkyFireZone());
     unawaited(addFromBlueprint(Slingshots()));