refactor: used size instead of width and height (#69)

lib/game/components/board.dart

@@ -94,7 +94,7 @@ class _BottomGroup extends Component {
 
   @override
   Future<void> onLoad() async {
-    final spacing = this.spacing + Flipper.width / 2;
+    final spacing = this.spacing + Flipper.size.x / 2;
     final rightSide = _BottomGroupSide(
       side: BoardSide.right,
       position: position + Vector2(spacing, 0),
@@ -135,15 +135,15 @@ class _BottomGroupSide extends Component {
     final baseboard = Baseboard(side: _side)
       ..initialPosition = _position +
           Vector2(
-            (Flipper.width * direction) - direction,
+            (Flipper.size.x * direction) - direction,
-            Flipper.height,
+            Flipper.size.y,
           );
     final slingShot = SlingShot(
       side: _side,
     )..initialPosition = _position +
         Vector2(
-          (Flipper.width) * direction,
+          (Flipper.size.x) * direction,
-          Flipper.height + SlingShot.size.y,
+          Flipper.size.y + SlingShot.size.y,
         );
 
     await addAll([flipper, baseboard, slingShot]);

lib/game/components/flipper.dart

@@ -58,11 +58,8 @@ class Flipper extends BodyComponent with KeyboardHandler, InitialPosition {
   /// Sprite is preloaded by [PinballGameAssetsX].
   static const spritePath = 'components/flipper.png';
 
-  /// The width of the [Flipper].
+  /// The size of the [Flipper].
-  static const width = 12.0;
+  static final size = Vector2(12, 2.8);
-
-  /// The height of the [Flipper].
-  static const height = 2.8;
 
   /// The speed required to move the [Flipper] to its highest position.
   ///
@@ -97,7 +94,7 @@ class Flipper extends BodyComponent with KeyboardHandler, InitialPosition {
     final sprite = await gameRef.loadSprite(spritePath);
     final spriteComponent = SpriteComponent(
       sprite: sprite,
-      size: Vector2(width, height),
+      size: size,
       anchor: Anchor.center,
     );
 
@@ -134,21 +131,21 @@ class Flipper extends BodyComponent with KeyboardHandler, InitialPosition {
     final fixturesDef = <FixtureDef>[];
     final isLeft = side.isLeft;
 
-    final bigCircleShape = CircleShape()..radius = height / 2;
+    final bigCircleShape = CircleShape()..radius = 1.75;
     bigCircleShape.position.setValues(
       isLeft
-          ? -(width / 2) + bigCircleShape.radius
+          ? -(size.x / 2) + bigCircleShape.radius
-          : (width / 2) - bigCircleShape.radius,
+          : (size.x / 2) - bigCircleShape.radius,
       0,
     );
     final bigCircleFixtureDef = FixtureDef(bigCircleShape);
     fixturesDef.add(bigCircleFixtureDef);
 
-    final smallCircleShape = CircleShape()..radius = bigCircleShape.radius / 2;
+    final smallCircleShape = CircleShape()..radius = 0.9;
     smallCircleShape.position.setValues(
       isLeft
-          ? (width / 2) - smallCircleShape.radius
+          ? (size.x / 2) - smallCircleShape.radius
-          : -(width / 2) + smallCircleShape.radius,
+          : -(size.x / 2) + smallCircleShape.radius,
       0,
     );
     final smallCircleFixtureDef = FixtureDef(smallCircleShape);
@@ -227,8 +224,8 @@ class FlipperAnchor extends JointAnchor {
   }) {
     initialPosition = Vector2(
       flipper.side.isLeft
-          ? flipper.body.position.x - Flipper.width / 2
+          ? flipper.body.position.x - Flipper.size.x / 2
-          : flipper.body.position.x + Flipper.width / 2,
+          : flipper.body.position.x + Flipper.size.x / 2,
       flipper.body.position.y,
     );
   }

test/game/components/flipper_test.dart

@@ -282,7 +282,7 @@ void main() {
         final flipperAnchor = FlipperAnchor(flipper: flipper);
         await game.ensureAdd(flipperAnchor);
 
-        expect(flipperAnchor.body.position.x, equals(-Flipper.width / 2));
+        expect(flipperAnchor.body.position.x, equals(-Flipper.size.x / 2));
       },
     );
 
@@ -297,7 +297,7 @@ void main() {
         final flipperAnchor = FlipperAnchor(flipper: flipper);
         await game.ensureAdd(flipperAnchor);
 
-        expect(flipperAnchor.body.position.x, equals(Flipper.width / 2));
+        expect(flipperAnchor.body.position.x, equals(Flipper.size.x / 2));
       },
     );
   });