feat: dynamic ball size (#113)

* feat: scale ball and add ball asset

* refactor: increase plunger properties

* test: board dimensions

* refactor: store adjusted height

* chore: add todo

lib/game/components/board.dart

@@ -15,8 +15,8 @@ class Board extends Component {
     // TODO(alestiago): adjust positioning once sprites are added.
     final bottomGroup = _BottomGroup(
       position: Vector2(
-        PinballGame.boardBounds.center.dx,
-        PinballGame.boardBounds.bottom + 10,
+        BoardDimensions.bounds.center.dx,
+        BoardDimensions.bounds.bottom + 10,
       ),
       spacing: 2,
     );
@@ -26,8 +26,8 @@ class Board extends Component {
     // TODO(alestiago): adjust positioning to real design.
     final dino = ChromeDino()
       ..initialPosition = Vector2(
-        PinballGame.boardBounds.center.dx + 25,
-        PinballGame.boardBounds.center.dy + 10,
+        BoardDimensions.bounds.center.dx + 25,
+        BoardDimensions.bounds.center.dy + 10,
       );
 
     await addAll([

lib/game/components/jetpack_ramp.dart

@@ -13,8 +13,8 @@ class Jetpack extends Forge2DBlueprint {
   @override
   void build(_) {
     final position = Vector2(
-      PinballGame.boardBounds.left + 40.5,
-      PinballGame.boardBounds.top - 31.5,
+      BoardDimensions.bounds.left + 40.5,
+      BoardDimensions.bounds.top - 31.5,
     );
 
     addAllContactCallback([

lib/game/components/launcher_ramp.dart

@@ -13,8 +13,8 @@ class Launcher extends Forge2DBlueprint {
   @override
   void build(_) {
     final position = Vector2(
-      PinballGame.boardBounds.right - 31.3,
-      PinballGame.boardBounds.bottom + 33,
+      BoardDimensions.bounds.right - 31.3,
+      BoardDimensions.bounds.bottom + 33,
     );
 
     addAllContactCallback([
@@ -67,8 +67,8 @@ class LauncherRamp extends BodyComponent with InitialPosition, Layered {
 
     final rightStraightShape = EdgeShape()
       ..set(
-        startPosition..rotate(PinballGame.boardPerspectiveAngle),
-        endPosition..rotate(PinballGame.boardPerspectiveAngle),
+        startPosition..rotate(BoardDimensions.perspectiveAngle),
+        endPosition..rotate(BoardDimensions.perspectiveAngle),
       );
     final rightStraightFixtureDef = FixtureDef(rightStraightShape);
     fixturesDef.add(rightStraightFixtureDef);

lib/game/components/plunger.dart

@@ -1,7 +1,6 @@
 import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/services.dart';
-import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
 
 /// {@template plunger}
@@ -26,10 +25,10 @@ class Plunger extends BodyComponent with KeyboardHandler, InitialPosition {
         1.35,
         0.5,
         Vector2.zero(),
-        PinballGame.boardPerspectiveAngle,
+        BoardDimensions.perspectiveAngle,
       );
 
-    final fixtureDef = FixtureDef(shape)..density = 20;
+    final fixtureDef = FixtureDef(shape)..density = 80;
 
     final bodyDef = BodyDef()
       ..position = initialPosition
@@ -50,7 +49,7 @@ 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) * 4;
+    final velocity = (initialPosition.y - body.position.y) * 5;
     body.linearVelocity = Vector2(0, velocity);
   }
 
@@ -127,12 +126,12 @@ class PlungerAnchorPrismaticJointDef extends PrismaticJointDef {
       plunger.body,
       anchor.body,
       anchor.body.position,
-      Vector2(18.6, PinballGame.boardBounds.height),
+      Vector2(18.6, BoardDimensions.bounds.height),
     );
     enableLimit = true;
     lowerTranslation = double.negativeInfinity;
     enableMotor = true;
-    motorSpeed = 80;
+    motorSpeed = 1000;
     maxMotorForce = motorSpeed;
     collideConnected = true;
   }

lib/game/components/wall.dart

@@ -3,7 +3,6 @@
 import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:pinball/game/components/components.dart';
-import 'package:pinball/game/pinball_game.dart';
 import 'package:pinball_components/pinball_components.dart';
 
 /// {@template wall}
@@ -42,13 +41,12 @@ class Wall extends BodyComponent {
 
 /// Create top, left, and right [Wall]s for the game board.
 List<Wall> createBoundaries(Forge2DGame game) {
-  final topLeft =
-      PinballGame.boardBounds.topLeft.toVector2() + Vector2(18.6, 0);
-  final bottomRight = PinballGame.boardBounds.bottomRight.toVector2();
+  final topLeft = BoardDimensions.bounds.topLeft.toVector2() + Vector2(18.6, 0);
+  final bottomRight = BoardDimensions.bounds.bottomRight.toVector2();
 
   final topRight =
-      PinballGame.boardBounds.topRight.toVector2() - Vector2(18.6, 0);
-  final bottomLeft = PinballGame.boardBounds.bottomLeft.toVector2();
+      BoardDimensions.bounds.topRight.toVector2() - Vector2(18.6, 0);
+  final bottomLeft = BoardDimensions.bounds.bottomLeft.toVector2();
 
   return [
     Wall(start: topLeft, end: topRight),
@@ -67,8 +65,8 @@ class BottomWall extends Wall {
   /// {@macro bottom_wall}
   BottomWall()
       : super(
-          start: PinballGame.boardBounds.bottomLeft.toVector2(),
-          end: PinballGame.boardBounds.bottomRight.toVector2(),
+          start: BoardDimensions.bounds.bottomLeft.toVector2(),
+          end: BoardDimensions.bounds.bottomRight.toVector2(),
         );
 }
 

lib/game/pinball_game.dart

@@ -1,6 +1,5 @@
 // ignore_for_file: public_member_api_docs
 import 'dart:async';
-import 'dart:math' as math;
 
 import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
@@ -22,15 +21,6 @@ class PinballGame extends Forge2DGame
 
   late final Plunger plunger;
 
-  static final boardSize = Vector2(101.6, 143.8);
-  static final boardBounds = Rect.fromCenter(
-    center: Offset.zero,
-    width: boardSize.x,
-    height: -boardSize.y,
-  );
-  static final boardPerspectiveAngle =
-      -math.atan(18.6 / PinballGame.boardBounds.height);
-
   @override
   void onAttach() {
     super.onAttach();
@@ -80,7 +70,8 @@ class PinballGame extends Forge2DGame
 
   Future<void> _addPlunger() async {
     plunger = Plunger(compressionDistance: 29)
-      ..initialPosition = boardBounds.center.toVector2() + Vector2(41.5, -49);
+      ..initialPosition =
+          BoardDimensions.bounds.center.toVector2() + Vector2(41.5, -49);
     await add(plunger);
   }
 
@@ -88,8 +79,8 @@ class PinballGame extends Forge2DGame
     await add(
       BonusWord(
         position: Vector2(
-          boardBounds.center.dx - 3.07,
-          boardBounds.center.dy - 2.4,
+          BoardDimensions.bounds.center.dx - 3.07,
+          BoardDimensions.bounds.center.dy - 2.4,
         ),
       ),
     );

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

@@ -23,13 +23,14 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
   }
 
   /// The size of the [Ball]
-  static final Vector2 size = Vector2.all(3);
+  static final Vector2 size = Vector2.all(4.5);
 
   /// The base [Color] used to tint this [Ball]
   final Color baseColor;
 
   double _boostTimer = 0;
   static const _boostDuration = 2.0;
+  late SpriteComponent _spriteComponent;
 
   @override
   Future<void> onLoad() async {
@@ -37,9 +38,9 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
     final sprite = await gameRef.loadSprite(Assets.images.ball.keyName);
     final tint = baseColor.withOpacity(0.5);
     await add(
-      SpriteComponent(
+      _spriteComponent = SpriteComponent(
         sprite: sprite,
-        size: size,
+        size: size * 1.15,
         anchor: Anchor.center,
       )..tint(tint),
     );
@@ -88,6 +89,8 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
 
       unawaited(gameRef.add(effect));
     }
+
+    _rescale();
   }
 
   /// Applies a boost on this [Ball].
@@ -95,4 +98,18 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
     body.applyLinearImpulse(impulse);
     _boostTimer = _boostDuration;
   }
+
+  void _rescale() {
+    final boardHeight = BoardDimensions.size.y;
+    const maxShrinkAmount = BoardDimensions.perspectiveShrinkFactor;
+
+    final adjustedYPosition = body.position.y + (boardHeight / 2);
+
+    final scaleFactor = ((boardHeight - adjustedYPosition) /
+            BoardDimensions.shrinkAdjustedHeight) +
+        maxShrinkAmount;
+
+    body.fixtures.first.shape.radius = (size.x / 2) * scaleFactor;
+    _spriteComponent.scale = Vector2.all(scaleFactor);
+  }
 }

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

@@ -0,0 +1,29 @@
+import 'dart:math' as math;
+
+import 'package:flame/extensions.dart';
+
+/// {@template board_dimensions}
+/// Contains various board properties and dimensions for global use.
+/// {@endtemplate}
+// TODO(allisonryan0002): consider alternatives for global dimensions.
+class BoardDimensions {
+  /// Width and height of the board.
+  static final size = Vector2(101.6, 143.8);
+
+  /// [Rect] for easier access to board boundaries.
+  static final bounds = Rect.fromCenter(
+    center: Offset.zero,
+    width: size.x,
+    height: -size.y,
+  );
+
+  /// 3D perspective angle of the board in radians.
+  static final perspectiveAngle = -math.atan(18.6 / bounds.height);
+
+  /// Factor the board shrinks by from the closest point to the farthest.
+  static const perspectiveShrinkFactor = 0.63;
+
+  /// Board height based on the [perspectiveShrinkFactor].
+  static final shrinkAdjustedHeight =
+      (1 / (1 - perspectiveShrinkFactor)) * size.y;
+}

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

@@ -1,4 +1,5 @@
 export 'ball.dart';
+export 'board_dimensions.dart';
 export 'board_side.dart';
 export 'fire_effect.dart';
 export 'flipper.dart';

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(1.5));
+          expect(fixture.shape.radius, equals(2.25));
         },
       );
 

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

@@ -0,0 +1,27 @@
+import 'package:flame/extensions.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball_components/pinball_components.dart';
+
+void main() {
+  group('BoardDimensions', () {
+    test('has size', () {
+      expect(BoardDimensions.size, equals(Vector2(101.6, 143.8)));
+    });
+
+    test('has bounds', () {
+      expect(BoardDimensions.bounds, isNotNull);
+    });
+
+    test('has perspectiveAngle', () {
+      expect(BoardDimensions.perspectiveAngle, isNotNull);
+    });
+
+    test('has perspectiveShrinkFactor', () {
+      expect(BoardDimensions.perspectiveShrinkFactor, equals(0.63));
+    });
+
+    test('has shrinkAdjustedHeight', () {
+      expect(BoardDimensions.shrinkAdjustedHeight, isNotNull);
+    });
+  });
+}