The event listeners in this game basically turn the movements of the objects on and off. We have already coded the functions that carry out the actions of our game objects to run the level. Now it's time to activate them using certain type of events. As you've noticed from the previous chapter, we can add event listeners to display objects or have them run globally.
Collision events within the physics engine occur through Corona's event listener model. There are three new event types:
"collision": This event includes phases for"began"and"ended", which signify the moments of initial contact and broken contact. These phases exist for both normal two-body collisions and body-sensor collisions. If you do not implement a"collision"listener, this event will not fire."preCollision": An event type that fires right before the objects start to interact. Depending on your game logic, you may wish to detect this event and conditionally override the collision...