fix: physics are FPS depended (#316)

* fix: physics are FPS depended

* fix: physics are FPS depended

lib/game/pinball_game.dart

@@ -5,7 +5,6 @@ import 'package:flame/components.dart';
 import 'package:flame/game.dart';
 import 'package:flame/input.dart';
 import 'package:flame_bloc/flame_bloc.dart';
-import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:pinball/game/game.dart';
@@ -14,7 +13,7 @@ import 'package:pinball_components/pinball_components.dart';
 import 'package:pinball_flame/pinball_flame.dart';
 import 'package:pinball_theme/pinball_theme.dart';
 
-class PinballGame extends Forge2DGame
+class PinballGame extends PinballForge2DGame
     with
         FlameBloc,
         HasKeyboardHandlerComponents,

packages/pinball_components/lib/src/components/ball/ball.dart

@@ -12,8 +12,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template ball}
 /// A solid, [BodyType.dynamic] sphere that rolls and bounces around.
 /// {@endtemplate}
-class Ball<T extends Forge2DGame> extends BodyComponent<T>
-    with Layered, InitialPosition, ZIndex {
+class Ball extends BodyComponent with Layered, InitialPosition, ZIndex {
   /// {@macro ball}
   Ball({
     required this.baseColor,

packages/pinball_components/lib/src/components/initial_position.dart

@@ -5,7 +5,7 @@ import 'package:flame_forge2d/flame_forge2d.dart';
 ///
 /// Note: If the [initialPosition] is set after the [BodyComponent] has been
 /// loaded it will have no effect; defaulting to [Vector2.zero].
-mixin InitialPosition<T extends Forge2DGame> on BodyComponent<T> {
+mixin InitialPosition on BodyComponent {
   final Vector2 _initialPosition = Vector2.zero();
 
   set initialPosition(Vector2 value) {

packages/pinball_components/lib/src/components/layer.dart

@@ -9,7 +9,7 @@ import 'package:flutter/material.dart';
 /// ignoring others. This compatibility depends on bit masking operation
 /// between layers. For more information read: https://en.wikipedia.org/wiki/Mask_(computing).
 /// {@endtemplate}
-mixin Layered<T extends Forge2DGame> on BodyComponent<T> {
+mixin Layered on BodyComponent {
   Layer _layer = Layer.all;
 
   /// {@macro layered}

packages/pinball_flame/lib/pinball_flame.dart

@@ -4,5 +4,6 @@ export 'src/component_controller.dart';
 export 'src/contact_behavior.dart';
 export 'src/keyboard_input_controller.dart';
 export 'src/parent_is_a.dart';
+export 'src/pinball_forge2d_game.dart';
 export 'src/sprite_animation.dart';
 export 'src/z_canvas_component.dart';

packages/pinball_flame/lib/src/pinball_forge2d_game.dart

@@ -0,0 +1,44 @@
+import 'dart:math';
+
+import 'package:flame/game.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:flame_forge2d/world_contact_listener.dart';
+
+// NOTE(wolfen): This should be removed when https://github.com/flame-engine/flame/pull/1597 is solved.
+/// {@template pinball_forge2d_game}
+/// A [Game] that uses the Forge2D physics engine.
+/// {@endtemplate}
+class PinballForge2DGame extends FlameGame implements Forge2DGame {
+  /// {@macro pinball_forge2d_game}
+  PinballForge2DGame({
+    required Vector2 gravity,
+  })  : world = World(gravity),
+        super(camera: Camera()) {
+    camera.zoom = Forge2DGame.defaultZoom;
+    world.setContactListener(WorldContactListener());
+  }
+
+  @override
+  final World world;
+
+  @override
+  void update(double dt) {
+    super.update(dt);
+    world.stepDt(min(dt, 1 / 60));
+  }
+
+  @override
+  Vector2 screenToFlameWorld(Vector2 position) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Vector2 screenToWorld(Vector2 position) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Vector2 worldToScreen(Vector2 position) {
+    throw UnimplementedError();
+  }
+}

packages/pinball_flame/test/src/pinball_forge2d_game_test.dart

@@ -0,0 +1,51 @@
+// ignore_for_file: cascade_invocations
+
+import 'package:flame/extensions.dart';
+import 'package:flame_test/flame_test.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball_flame/pinball_flame.dart';
+
+void main() {
+  final flameTester = FlameTester(
+    () => PinballForge2DGame(gravity: Vector2.zero()),
+  );
+
+  group('PinballForge2DGame', () {
+    test('can instantiate', () {
+      expect(
+        () => PinballForge2DGame(gravity: Vector2.zero()),
+        returnsNormally,
+      );
+    });
+
+    flameTester.test(
+      'screenToFlameWorld throws UnimpelementedError',
+      (game) async {
+        expect(
+          () => game.screenToFlameWorld(Vector2.zero()),
+          throwsUnimplementedError,
+        );
+      },
+    );
+
+    flameTester.test(
+      'screenToWorld throws UnimpelementedError',
+      (game) async {
+        expect(
+          () => game.screenToWorld(Vector2.zero()),
+          throwsUnimplementedError,
+        );
+      },
+    );
+
+    flameTester.test(
+      'worldToScreen throws UnimpelementedError',
+      (game) async {
+        expect(
+          () => game.worldToScreen(Vector2.zero()),
+          throwsUnimplementedError,
+        );
+      },
+    );
+  });
+}

test/game/components/controlled_ball_test.dart

@@ -2,7 +2,6 @@
 
 import 'package:bloc_test/bloc_test.dart';
 import 'package:flame/extensions.dart';
-import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
@@ -15,7 +14,7 @@ import '../../helpers/helpers.dart';
 // TODO(allisonryan0002): remove once
 // https://github.com/flame-engine/flame/pull/1520 is merged
 class _WrappedBallController extends BallController {
-  _WrappedBallController(Ball<Forge2DGame> ball, this._gameRef) : super(ball);
+  _WrappedBallController(Ball ball, this._gameRef) : super(ball);
 
   final PinballGame _gameRef;