refactor: dimension and position `Plunger` (#96)

* refactor: dimension plunger

* refactor: adjust launch ramp and ball size

* refactor: use board center for positioning

Co-authored-by: Erick <erickzanardoo@gmail.com>

lib/game/components/launcher_ramp.dart

@@ -27,33 +27,30 @@ class LauncherRamp extends Component with HasGameRef<PinballGame> {
       RampOpeningBallContactCallback<_LauncherRampOpening>(),
     );
 
-    final launcherRampRotation =
-        -math.atan(18.6 / PinballGame.boardBounds.height);
-
     final straightPath = Pathway.straight(
       color: const Color.fromARGB(255, 34, 255, 0),
-      start: position + Vector2(-1.2, 10),
-      end: position + Vector2(-1.2, 117),
-      width: 5,
-      rotation: launcherRampRotation,
+      start: position + Vector2(-4.5, -10),
+      end: position + Vector2(-4.5, 117),
+      width: 4,
+      rotation: PinballGame.boardPerspectiveAngle,
     )
       ..initialPosition = position
       ..layer = layer;
 
     final curvedPath = Pathway.arc(
       color: const Color.fromARGB(255, 251, 255, 0),
-      center: position + Vector2(-2.8, 87.2),
+      center: position + Vector2(-7, 87.2),
       radius: 16.3,
       angle: math.pi / 2,
-      width: 5,
+      width: 4,
       rotation: 3 * math.pi / 2,
     )..layer = layer;
 
     final leftOpening = _LauncherRampOpening(rotation: math.pi / 2)
-      ..initialPosition = position + Vector2(-11.8, 66.3)
+      ..initialPosition = position + Vector2(-13.8, 66.7)
       ..layer = Layer.opening;
     final rightOpening = _LauncherRampOpening(rotation: 0)
-      ..initialPosition = position + Vector2(-4.9, 59.4)
+      ..initialPosition = position + Vector2(-6.8, 59.4)
       ..layer = Layer.opening;
 
     await addAll([
@@ -81,9 +78,9 @@ class _LauncherRampOpening extends RampOpening {
 
   final double _rotation;
 
-  // TODO(ruialonso): Avoid magic number 3, should be propotional to
+  // TODO(ruialonso): Avoid magic number 2.5, should be propotional to
   // [JetpackRamp].
-  static final Vector2 _size = Vector2(3, .1);
+  static final Vector2 _size = Vector2(2.5, .1);
 
   @override
   Shape get shape => PolygonShape()

lib/game/components/plunger.dart

@@ -21,9 +21,15 @@ class Plunger extends BodyComponent with KeyboardHandler, InitialPosition {
 
   @override
   Body createBody() {
-    final shape = PolygonShape()..setAsBoxXY(2, 0.75);
+    final shape = PolygonShape()
+      ..setAsBox(
+        1.35,
+        0.5,
+        Vector2.zero(),
+        PinballGame.boardPerspectiveAngle,
+      );
 
-    final fixtureDef = FixtureDef(shape)..density = 5;
+    final fixtureDef = FixtureDef(shape)..density = 20;
 
     final bodyDef = BodyDef()
       ..position = initialPosition
@@ -36,7 +42,7 @@ class Plunger extends BodyComponent with KeyboardHandler, InitialPosition {
 
   /// Set a constant downward velocity on the [Plunger].
   void _pull() {
-    body.linearVelocity = Vector2(0, -3);
+    body.linearVelocity = Vector2(0, -7);
   }
 
   /// Set an upward velocity on the [Plunger].
@@ -44,7 +50,7 @@ class Plunger extends BodyComponent with KeyboardHandler, InitialPosition {
   /// The velocity's magnitude depends on how far the [Plunger] has been pulled
   /// from its original [initialPosition].
   void _release() {
-    final velocity = (initialPosition.y - body.position.y) * 9;
+    final velocity = (initialPosition.y - body.position.y) * 4;
     body.linearVelocity = Vector2(0, velocity);
   }
 
@@ -121,12 +127,12 @@ class PlungerAnchorPrismaticJointDef extends PrismaticJointDef {
       plunger.body,
       anchor.body,
       anchor.body.position,
-      Vector2(0, -1),
+      Vector2(18.6, PinballGame.boardBounds.height),
     );
     enableLimit = true;
     lowerTranslation = double.negativeInfinity;
     enableMotor = true;
-    motorSpeed = 50;
+    motorSpeed = 80;
     maxMotorForce = motorSpeed;
     collideConnected = true;
   }

lib/game/pinball_game.dart

@@ -1,5 +1,7 @@
 // ignore_for_file: public_member_api_docs
 import 'dart:async';
+import 'dart:math' as math;
+
 import 'package:flame/extensions.dart';
 import 'package:flame/input.dart';
 import 'package:flame_bloc/flame_bloc.dart';
@@ -24,6 +26,8 @@ class PinballGame extends Forge2DGame
     width: boardSize.x,
     height: -boardSize.y,
   );
+  static final boardPerspectiveAngle =
+      -math.atan(18.6 / PinballGame.boardBounds.height);
 
   @override
   void onAttach() {
@@ -60,13 +64,8 @@ class PinballGame extends Forge2DGame
   }
 
   Future<void> _addPlunger() async {
-    plunger = Plunger(compressionDistance: 2);
-
-    plunger.initialPosition = boardBounds.bottomRight.toVector2() +
-        Vector2(
-          -5,
-          10,
-        );
+    plunger = Plunger(compressionDistance: 29)
+      ..initialPosition = boardBounds.center.toVector2() + Vector2(41.5, -49);
     await add(plunger);
   }
 

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

@@ -22,7 +22,7 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
   }
 
   /// The size of the [Ball]
-  final Vector2 size = Vector2.all(2);
+  final Vector2 size = Vector2.all(3);
 
   /// The base [Color] used to tint this [Ball]
   final Color baseColor;

packages/pinball_components/test/src/components/ball_test.dart

@@ -86,7 +86,7 @@ void main() {
 
           final fixture = ball.body.fixtures[0];
           expect(fixture.shape.shapeType, equals(ShapeType.circle));
-          expect(fixture.shape.radius, equals(1));
+          expect(fixture.shape.radius, equals(1.5));
         },
       );