Ink splashes should start at the touch point

sky/examples/game/lib/game_box.dart

 part of game;
 
 const double _steeringThreshold = 20.0;
 const double _steeringMax = 50.0;
 
 class GameBox extends SpriteBox {
 
   GameBox(GameWorld game) : super(game, SpriteBoxTransformMode.letterbox);
 
   GameWorld get _gameWorld => this.rootNode;
 
   // Handle pointers
   int _firstPointer = -1;
   int _secondPointer = -1;
   Vector2 _firstPointerDownPos;
 
-  void handleEvent(Event event) {
+  void handleEvent(Event event, BoxHitTestData data) {
     if (event is PointerEvent) {
       Vector2 pointerPos = new Vector2(event.x, event.y);
       int pointer = event.pointer;
 
       switch (event.type) {
         case 'pointerdown':
           if (_firstPointer == -1) {
             // Assign the first pointer
             _firstPointer = pointer;
             _firstPointerDownPos = pointerPos;
@@ skipping 34 matching lines @@
             _gameWorld.controlThrust(null);
           }
           break;
         default:
           break;
       }
     }
   }
 
 }