refactor: placed drop ramp below spaceship, fixed position and layers

lib/game/components/spaceship.dart

@@ -31,7 +31,9 @@ class Spaceship extends Forge2DBlueprint {
       SpaceshipEntrance()..initialPosition = position,
       SpaceshipBridge()..initialPosition = position,
       SpaceshipBridgeTop()..initialPosition = position + Vector2(0, 5.5),
-      SpaceshipHole()..initialPosition = position - Vector2(5, 4),
+      SpaceshipHole(
+        onExitLayer: Layer.spaceship_drop,
+      )..initialPosition = position - Vector2(5, 4),
       SpaceshipHole()..initialPosition = position - Vector2(-5, 4),
       SpaceshipWall()..initialPosition = position,
     ]);
@@ -211,26 +213,20 @@ class SpaceshipEntrance extends RampOpening {
 /// A sensor [BodyComponent] responsible for sending the [Ball]
 /// back to the board.
 /// {@endtemplate}
-class SpaceshipHole extends BodyComponent with InitialPosition, Layered {
+class SpaceshipHole extends RampOpening {
   /// {@macro spaceship_hole}
-  SpaceshipHole() {
+  SpaceshipHole({Layer? onExitLayer})
+      : super(
+          pathwayLayer: Layer.spaceship,
+          outsideLayer: onExitLayer,
+          orientation: RampOrientation.up,
+        ) {
     layer = Layer.spaceship;
   }
 
   @override
-  Body createBody() {
-    renderBody = false;
-    final circleShape = CircleShape()..radius = Spaceship.radius / 40;
-
-    final bodyDef = BodyDef()
-      ..userData = this
-      ..position = initialPosition
-      ..type = BodyType.static;
-
-    return world.createBody(bodyDef)
-      ..createFixture(
-        FixtureDef(circleShape)..isSensor = true,
-      );
+  Shape get shape {
+    return CircleShape()..radius = Spaceship.radius / 40;
   }
 }
 
@@ -321,6 +317,6 @@ class SpaceshipHoleBallContactCallback
     ball
       ..priority = 1
       ..gameRef.reorderChildren()
-      ..layer = Layer.board;
+      ..layer = hole.outsideLayer;
   }
 }

lib/game/components/spaceship_drop_ramp.dart

@@ -10,18 +10,17 @@ class SpaceshipDropRamp extends Forge2DBlueprint {
   @override
   void build() {
     final position = Vector2(
-      PinballGame.boardBounds.left + 23,
-      PinballGame.boardBounds.center.dy + 25,
+      PinballGame.boardBounds.left + 22,
+      PinballGame.boardBounds.center.dy + 27,
     );
 
     addAllContactCallback([
-      SpaceshipHoleBallContactCallback(),
-      SpaceshipEntranceBallContactCallback(),
+      SpaceshipDropHoleBallContactCallback(),
     ]);
 
     final curvedPath = Pathway.bezierCurve(
-      color: Color.fromARGB(255, 226, 226, 218),
-      width: 5,
+      color: const Color.fromARGB(255, 226, 226, 218),
+      width: 4,
       rotation: 230 * math.pi / 180,
       controlPoints: [
         Vector2(0, 0),
@@ -31,42 +30,67 @@ class SpaceshipDropRamp extends Forge2DBlueprint {
       ],
     )..layer = Layer.spaceship_drop;
 
+    final curvedEntrance = Pathway.arc(
+      color: const Color.fromARGB(255, 226, 226, 218),
+      center: position,
+      radius: 4,
+      angle: math.pi / 2,
+      width: 5,
+      rotation: 218 * math.pi / 180,
+      singleWall: true,
+    )..layer = Layer.spaceship_drop;
+
+    final curvedExit = Pathway.arc(
+      color: const Color.fromARGB(255, 226, 226, 218),
+      center: position,
+      radius: 4,
+      angle: math.pi / 2,
+      width: 5,
+      rotation: 36 * math.pi / 180,
+      singleWall: true,
+    )..layer = Layer.spaceship_drop;
+
     addAll([
       curvedPath..initialPosition = position,
+      curvedEntrance..initialPosition = position + Vector2(26.5, -30),
+      curvedExit..initialPosition = position + Vector2(29, -66.5),
+      SpaceshipDropHole()..initialPosition = position + Vector2(0, -42),
     ]);
   }
 }
 
-class SpaceshipRampEntrance extends RampOpening {
-  /// {@macro spaceship_ramp_entrance}
-  SpaceshipRampEntrance()
+/// {@template spaceship_drop_hole}
+/// A sensor [BodyComponent] responsible for sending the [Ball]
+/// back to the board.
+/// {@endtemplate}
+class SpaceshipDropHole extends RampOpening {
+  /// {@macro spaceship_drop_hole}
+  SpaceshipDropHole()
       : super(
           pathwayLayer: Layer.spaceship_drop,
-          orientation: RampOrientation.up,
+          orientation: RampOrientation.down,
         ) {
     layer = Layer.spaceship_drop;
   }
 
   @override
   Shape get shape {
-    const radius = Spaceship.radius * 2;
-    return PolygonShape();
+    return CircleShape()..radius = Spaceship.radius / 40;
   }
 }
 
-class SpaceshipRampExit extends RampOpening {
-  /// {@macro spaceship_ramp_entrance}
-  SpaceshipRampExit()
-      : super(
-          pathwayLayer: Layer.spaceship_drop,
-          orientation: RampOrientation.down,
-        ) {
-    layer = Layer.spaceship_drop;
-  }
-
+/// [ContactCallback] that handles the contact between the [Ball]
+/// and a [SpaceshipDropHole].
+///
+/// It resets the [Ball] priority and filter data so it will "be back" on the
+/// board.
+class SpaceshipDropHoleBallContactCallback
+    extends ContactCallback<SpaceshipDropHole, Ball> {
   @override
-  Shape get shape {
-    const radius = Spaceship.radius * 2;
-    return PolygonShape();
+  void begin(SpaceshipDropHole hole, Ball ball, _) {
+    ball
+      ..priority = 1
+      ..gameRef.reorderChildren()
+      ..layer = hole.outsideLayer;
   }
 }