Fixes nits

examples/game/lib/constraint.dart

@@ -8,6 +8,9 @@ abstract class Constraint {
 }
 
 double _dampenRotation(double src, double dst, double dampening) {
+  if (dampening == null)
+    return dst;
+
   double delta = dst - src;
   while (delta > 180.0) delta -= 360;
   while (delta < -180) delta += 360;
@@ -36,9 +39,6 @@ class ConstraintRotationToMovement {
     Offset offset = node.position - _lastPosition;
     double target = degrees(GameMath.atan2(offset.dy, offset.dx)) + baseRotation;
 
-    if (dampening == null)
-      node.rotation = target;
-    else
     node.rotation = _dampenRotation(node.rotation, target, dampening);
   }
 }
@@ -62,9 +62,6 @@ class ConstraintRotationToNode {
 
     double target = degrees(GameMath.atan2(offset.dy, offset.dx)) + baseRotation;
 
-    if (dampening == null)
-      node.rotation = target;
-    else
     node.rotation = _dampenRotation(node.rotation, target, dampening);
   }
 }

examples/game/lib/game_demo_node.dart

@@ -394,7 +394,7 @@ abstract class Asteroid extends Obstacle {
   void setupActions() {
     // Rotate obstacle
     int direction = 1;
-    if (randomDouble() < 0.5) direction = -1;
+    if (randomBool()) direction = -1;
     ActionTween rotate = new ActionTween(
       (a) => _sprt.rotation = a,
       0.0, 360.0 * direction, 5.0 + 5.0 * randomDouble());
@@ -442,21 +442,25 @@ class MovingEnemy extends Obstacle {
   final double _swirlSpacing = 80.0;
 
   _addRandomSquare(List<Offset> offsets, double x, double y) {
-    double xMove = (randomDouble() < 0.5) ? _swirlSpacing : -_swirlSpacing;
-    double yMove = (randomDouble() < 0.5) ? _swirlSpacing : -_swirlSpacing;
-
-    if (randomDouble() < 0.5) {
-      offsets.add(new Offset(x, y));
-      offsets.add(new Offset(xMove + x, y));
-      offsets.add(new Offset(xMove + x, yMove + y));
-      offsets.add(new Offset(x, yMove + y));
-      offsets.add(new Offset(x, y));
+    double xMove = (randomBool()) ? _swirlSpacing : -_swirlSpacing;
+    double yMove = (randomBool()) ? _swirlSpacing : -_swirlSpacing;
+
+    if (randomBool()) {
+      offsets.addAll([
+        new Offset(x, y),
+        new Offset(xMove + x, y),
+        new Offset(xMove + x, yMove + y),
+        new Offset(x, yMove + y),
+        new Offset(x, y)
+      ]);
     } else {
-      offsets.add(new Offset(x, y));
-      offsets.add(new Offset(x, y + yMove));
-      offsets.add(new Offset(xMove + x, yMove + y));
-      offsets.add(new Offset(xMove + x, y));
-      offsets.add(new Offset(x, y));
+      offsets.addAll([
+        new Offset(x, y),
+        new Offset(x, y + yMove),
+        new Offset(xMove + x, yMove + y),
+        new Offset(xMove + x, y),
+        new Offset(x, y)
+      ]);
     }
   }
 

examples/game/lib/util.dart

@@ -17,6 +17,10 @@ int randomInt(int max) {
   return _random.nextInt(max);
 }
 
+bool randomBool() {
+  return _random.nextDouble() < 0.5;
+}
+
 // atan2
 
 class _Atan2Constants {