feat: made Baseboard use InitialPosition

lib/game/components/baseboard.dart

@@ -6,13 +6,11 @@ import 'package:pinball/game/game.dart';
 /// {@template baseboard}
 /// Straight, angled board piece to corral the [Ball] towards the [Flipper]s.
 /// {@endtemplate}
-class Baseboard extends BodyComponent {
+class Baseboard extends BodyComponent with InitialPosition {
   /// {@macro baseboard}
   Baseboard({
     required BoardSide side,
-    required Vector2 position,
-  })  : _side = side,
-        _position = position;
+  }) : _side = side;
 
   /// The width of the [Baseboard].
   static const width = 10.0;
@@ -20,9 +18,6 @@ class Baseboard extends BodyComponent {
   /// The height of the [Baseboard].
   static const height = 2.0;
 
-  /// The position of the [Baseboard] body.
-  final Vector2 _position;
-
   /// Whether the [Baseboard] is on the left or right side of the board.
   final BoardSide _side;
 
@@ -63,7 +58,7 @@ class Baseboard extends BodyComponent {
     const angle = math.pi / 7;
 
     final bodyDef = BodyDef()
-      ..position = _position
+      ..position = initialPosition
       ..type = BodyType.static
       ..angle = _side.isLeft ? -angle : angle;
 

lib/game/components/board.dart

@@ -61,14 +61,12 @@ class _BottomGroupSide extends Component {
       side: _side,
       position: _position,
     );
-    final baseboard = Baseboard(
-      side: _side,
-      position: _position +
+    final baseboard = Baseboard(side: _side)
+      ..initialPosition = _position +
           Vector2(
             (Flipper.width * direction) - direction,
             Flipper.height,
-          ),
-    );
+          );
     final slingShot = SlingShot(
       side: _side,
       position: _position +

test/game/components/baseboard_test.dart

@@ -15,13 +15,12 @@ void main() {
       (game) async {
         await game.ready();
         final leftBaseboard = Baseboard(
-          position: Vector2.zero(),
           side: BoardSide.left,
-        );
+        )..initialPosition = Vector2.zero();
         final rightBaseboard = Baseboard(
-          position: Vector2.zero(),
           side: BoardSide.right,
-        );
+        )..initialPosition = Vector2.zero();
+
         await game.ensureAddAll([leftBaseboard, rightBaseboard]);
 
         expect(game.contains(leftBaseboard), isTrue);
@@ -35,13 +34,13 @@ void main() {
         (game) async {
           final position = Vector2.all(10);
           final baseboard = Baseboard(
-            position: position,
             side: BoardSide.left,
-          );
+          )..initialPosition = position;
+
           await game.ensureAdd(baseboard);
           game.contains(baseboard);
 
-          expect(baseboard.body.position, position);
+          expect(baseboard.body.position, equals(position));
         },
       );
 
@@ -49,9 +48,9 @@ void main() {
         'is static',
         (game) async {
           final baseboard = Baseboard(
-            position: Vector2.zero(),
             side: BoardSide.left,
-          );
+          )..initialPosition = Vector2.zero();
+
           await game.ensureAdd(baseboard);
 
           expect(baseboard.body.bodyType, equals(BodyType.static));
@@ -62,13 +61,11 @@ void main() {
         'is at an angle',
         (game) async {
           final leftBaseboard = Baseboard(
-            position: Vector2.zero(),
             side: BoardSide.left,
-          );
+          )..initialPosition = Vector2.zero();
           final rightBaseboard = Baseboard(
-            position: Vector2.zero(),
             side: BoardSide.right,
-          );
+          )..initialPosition = Vector2.zero();
           await game.ensureAddAll([leftBaseboard, rightBaseboard]);
 
           expect(leftBaseboard.body.angle, isNegative);
@@ -82,9 +79,8 @@ void main() {
         'has three',
         (game) async {
           final baseboard = Baseboard(
-            position: Vector2.zero(),
             side: BoardSide.left,
-          );
+          )..initialPosition = Vector2.zero();
           await game.ensureAdd(baseboard);
 
           expect(baseboard.body.fixtures.length, equals(3));