auto bgPic = Sprite :: create( "StartGameBg.jpg" );             bgPic ->setContentSize ( Size( 800.0f , 1246.0f));             bgPic ->setPosition ( Vec2( visibleSize .width / 2 , - bgPic -> getContentSize(). height /2 + visibleSize . height));             this -> addChild( bgPic );             FiniteTimeAction * moveAction = EaseExponentialInOut:: create (MoveTo :: create( 6.0f , Vec2 (visibleSize . width / 2 ,bgPic -> getContentSize(). height / 2)));             bgPic ->runAction ( Sequence:: create (                         moveAction ,                         CallFunc ::create ( CC_CALLBACK_0( GameStartScene ::buttonLogin , this )),                         nullptr ));