refactor: dimension plunger

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 = Plunger(compressionDistance: 29)
-
+      ..initialPosition = Vector2(41.5, -49);
-    plunger.initialPosition = boardBounds.bottomRight.toVector2() +
-        Vector2(
-          -5,
-          10,
-        );
     await add(plunger);
   }