chore: half sweeping angle

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

@@ -196,8 +196,8 @@ class _FlipperJoint extends RevoluteJoint {
     lock();
   }
 
-  /// The total angle of the arc motion.
+  /// Half the angle of the arc motion.
-  static const _sweepingAngle = 1.222;
+  static const _halfSweepingAngle = 0.611;
 
   final BoardSide side;
 
@@ -206,7 +206,7 @@ class _FlipperJoint extends RevoluteJoint {
   /// The joint is locked when initialized in order to force the [Flipper]
   /// at its resting position.
   void lock() {
-    const angle = _sweepingAngle / 2;
+    const angle = _halfSweepingAngle;
     setLimits(
       -angle * side.direction,
       -angle * side.direction,
@@ -215,7 +215,7 @@ class _FlipperJoint extends RevoluteJoint {
 
   /// Unlocks the [Flipper] from its resting position.
   void unlock() {
-    const angle = _sweepingAngle / 2;
+    const angle = _halfSweepingAngle;
     setLimits(-angle, angle);
   }
 }