feat: defined BallScalingBehavior

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

@@ -6,6 +6,7 @@ import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/widgets.dart';
 import 'package:pinball_components/pinball_components.dart';
+import 'package:pinball_components/src/components/ball/behaviors/ball_scaling_behavior.dart';
 import 'package:pinball_flame/pinball_flame.dart';
 
 /// {@template ball}
@@ -20,6 +21,7 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
           renderBody: false,
           children: [
             _BallSpriteComponent()..tint(baseColor.withOpacity(0.5)),
+            BallScalingBehavior(),
           ],
         ) {
     // TODO(ruimiguel): while developing Ball can be launched by clicking mouse,
@@ -81,26 +83,9 @@ class Ball<T extends Forge2DGame> extends BodyComponent<T>
   void update(double dt) {
     super.update(dt);
 
-    _rescaleSize();
     _setPositionalGravity();
   }
 
-  void _rescaleSize() {
-    final boardHeight = BoardDimensions.bounds.height;
-    const maxShrinkValue = BoardDimensions.perspectiveShrinkFactor;
-
-    final standardizedYPosition = body.position.y + (boardHeight / 2);
-
-    final scaleFactor = maxShrinkValue +
-        ((standardizedYPosition / boardHeight) * (1 - maxShrinkValue));
-
-    body.fixtures.first.shape.radius = (size.x / 2) * scaleFactor;
-
-    // TODO(alestiago): Revisit and see if there's a better way to do this.
-    final spriteComponent = firstChild<_BallSpriteComponent>();
-    spriteComponent?.scale = Vector2.all(scaleFactor);
-  }
-
   void _setPositionalGravity() {
     final defaultGravity = gameRef.world.gravity.y;
     final maxXDeviationFromCenter = BoardDimensions.bounds.width / 2;

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

@@ -0,0 +1,21 @@
+import 'package:flame/components.dart';
+import 'package:pinball_components/pinball_components.dart';
+import 'package:pinball_flame/pinball_flame.dart';
+
+/// Scales the ball body and sprite accordingly to the board's perspective.
+class BallScalingBehavior extends Component with ParentIsA<Ball> {
+  @override
+  void update(double dt) {
+    super.update(dt);
+    final boardHeight = BoardDimensions.bounds.height;
+    const maxShrinkValue = BoardDimensions.perspectiveShrinkFactor;
+
+    final standardizedYPosition = parent.body.position.y + (boardHeight / 2);
+    final scaleFactor = maxShrinkValue +
+        ((standardizedYPosition / boardHeight) * (1 - maxShrinkValue));
+
+    parent.body.fixtures.first.shape.radius = (Ball.size.x / 2) * scaleFactor;
+
+    parent.firstChild<SpriteComponent>()!.scale = Vector2.all(scaleFactor);
+  }
+}

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

@@ -0,0 +1 @@
+export 'ball_scaling_behavior.dart';

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

@@ -2,7 +2,7 @@ export 'android_animatronic.dart';
 export 'android_bumper/android_bumper.dart';
 export 'android_spaceship/android_spaceship.dart';
 export 'backboard/backboard.dart';
-export 'ball.dart';
+export 'ball/ball.dart';
 export 'baseboard.dart';
 export 'board_background_sprite_component.dart';
 export 'board_dimensions.dart';