Adding Actions and Animations - Beginning Swift Games Development for iOS - page 79

-((playerNode!.position.y - 180.0)/8));
backgroundStarsNode!.position
= CGPointMake(backgroundStarsNode!.position.x,
-((playerNode!.position.y - 180.0)/6))
self.foregroundNode!.position
= CGPointMake(self.foregroundNode!.position.x,
-(self.playerNode!.position.y - 180.0));
}
}
Notice the bolded section of the modified update() method. With these two lines I am
moving the stars relative to the playerNode , but I am moving them at a slightly slower
rate than the backgroundNode . This gives the illusion that the back-
groundStarsNode is closer to the viewport of the scene. Make this change to the up-
date() method and run the application again. When the game is first launched, you will
see a scene that looks like Figure 5-4 .