Device Internal Clock and Cyclic Movement: Non-Game Apps - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 331

Your rule should match Figure 10-24.
Figure 10-24. Sync the movement rule
Building the Metronome: Laying out the Scene
The layout of the scene is quite easy, as you have positioned your actors using
behaviors. But the order in which you position the actors is important for the
visual aspect.
Position the actors in the center of the scene in the following order, as per
Figure 10-25:
 Pendulum
 Weight
 Metronome
 On
 Off