refactor: simplify ball entering spaceship

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

@@ -17,6 +17,7 @@ class AndroidSpaceship extends Blueprint {
             _SpaceshipSaucerSpriteAnimationComponent()..position = position,
             _LightBeamSpriteComponent()..position = position + Vector2(2.5, 5),
             _AndroidHead()..initialPosition = position + Vector2(0.5, 0.25),
+            _SpaceshipEntrance(),
             _SpaceshipHole(
               outsideLayer: Layer.spaceshipExitRail,
               outsidePriority: RenderPriority.ballOnSpaceshipRail,
@@ -185,6 +186,30 @@ class _AndroidHeadSpriteAnimationComponent extends SpriteAnimationComponent
   }
 }
 
+class _SpaceshipEntrance extends LayerSensor {
+  _SpaceshipEntrance()
+      : super(
+          insideLayer: Layer.spaceship,
+          outsideLayer: Layer.spaceshipEntranceRamp,
+          orientation: LayerEntranceOrientation.up,
+          insidePriority: RenderPriority.ballOnSpaceship,
+          outsidePriority: RenderPriority.ballOnSpaceshipRamp,
+        ) {
+    layer = Layer.spaceship;
+  }
+
+  @override
+  Shape get shape {
+    return PolygonShape()
+      ..setAsBox(
+        2,
+        0.1,
+        Vector2(-27.4, -37.2),
+        -0.12,
+      );
+  }
+}
+
 class _SpaceshipHole extends LayerSensor {
   _SpaceshipHole({required Layer outsideLayer, required int outsidePriority})
       : super(

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

@@ -15,19 +15,7 @@ class SpaceshipRamp extends Blueprint {
   SpaceshipRamp()
       : super(
           components: [
-            _SpaceshipRampOpening(
-              outsidePriority: RenderPriority.ballOnBoard,
-              rotation: math.pi,
-            )
-              ..initialPosition = Vector2(1.7, -19.8)
-              ..layer = Layer.opening,
-            _SpaceshipRampOpening(
-              outsideLayer: Layer.spaceship,
-              outsidePriority: RenderPriority.ballOnSpaceship,
-              rotation: math.pi,
-            )
-              ..initialPosition = Vector2(-13.7, -18.6)
-              ..layer = Layer.spaceshipEntranceRamp,
+            _SpaceshipRampOpening()..initialPosition = Vector2(1.7, -19.8),
             _SpaceshipRampBackground(),
             _SpaceshipRampBoardOpeningSpriteComponent()
               ..position = Vector2(3.4, -39.5),
@@ -343,21 +331,15 @@ class _SpaceshipRampBase extends BodyComponent with InitialPosition, Layered {
 /// {@endtemplate}
 class _SpaceshipRampOpening extends LayerSensor {
   /// {@macro spaceship_ramp_opening}
-  _SpaceshipRampOpening({
-    Layer? outsideLayer,
-    int? outsidePriority,
-    required double rotation,
-  })  : _rotation = rotation,
-        super(
+  _SpaceshipRampOpening()
+      : super(
           insideLayer: Layer.spaceshipEntranceRamp,
-          outsideLayer: outsideLayer,
+          outsideLayer: Layer.opening,
           orientation: LayerEntranceOrientation.down,
           insidePriority: RenderPriority.ballOnSpaceshipRamp,
-          outsidePriority: outsidePriority,
+          outsidePriority: RenderPriority.ballOnBoard,
         );
 
-  final double _rotation;
-
   static final Vector2 _size = Vector2(_SpaceshipRampBackground.width / 3, .1);
 
   @override
@@ -367,7 +349,7 @@ class _SpaceshipRampOpening extends LayerSensor {
         _size.x,
         _size.y,
         initialPosition,
-        _rotation,
+        math.pi,
       );
   }
 }