     
     
     
+    
 }

    
    
    func zombieHitSheep(sheep: SKSpriteNode) {
        sheep.removeFromParent()
        
        runAction(sheepCollisionSound)
    }
    
    

    var lastUpdateTime: NSTimeInterval = 0
    var dt: NSTimeInterval = 0
    let zombieMovePointsPerSec: CGFloat = 480.0
    let catMovePointsPerSec:CGFloat = 480.0

    var velocity = CGPointZero
    let playableRect: CGRect
    var lastTouchLocation: CGPoint?
