/**
 Designated initializer for puzzle animation and it's subclasses
 
 - parameter viewToAnimate: view to render into pieces
 - parameter configuration: animation configuration
 
 - returns: newly created animation instance
 */
init(viewToAnimate: UIView, configuration: PuzzleAnimationConfiguration = PuzzleAnimationConfiguration())

/**
 *  Defines the structure that contains configurable parameters for puzzle animation
*/
struct PuzzleAnimationConfiguration {

  /// Defines the animation velocity. Higher velocity less animation duration
  var animationVelocity: NSTimeInterval = 1

  /// Defines the delay between each piece in piece's group animation
  var pieceAnimationDelay: PuzzleAnimationDelay = defaultForwardPieceAnimationDelay

  /// Defines the delay between each group of pieces animation
  var pieceGroupAnimationDelay: PuzzleAnimationDelay = defaultForwardPieceGroupAnimationDelay

  /// Defines the animation piece's scale
  var animationScale: Double = 2.5

  /// Each piece represents square and this value represents the number of pixels of square side
  var pieceSide: CGFloat = 40
}

/// Called when animation completed, stoped or failed
/// @note You can set it any time even during the animation
public var animationCompletion: PuzzleAnimationCompletion?

/**
 Starts the animation. Makes view to animate hidden
*/
public func start()
    
/**
 Stops the animation. Removes all pieces from superview. Makes view to animate visible
 */
public func stop()