Game Engine Events

Introductions

Introduce yourselves!

Icebreaker: What’s your favorite Mobile game?

Groupwork

Games are inherently event-driven.

An event is anything that happens that a game object may need to take note of.

1. What are some examples of game engine events?

2. Generally, a game engine must: A) Notify interested game objects, and B) Arrange for those game objects to respond. This is called event handling.

• Consider handling “explosion” events in the below code.

    void Explosion::Update()
     ...
      if (explosion_went_off) then

        // Get list of all Objects in range.
        ObjectList list = WM.getObjectsInRange(radius)

        // Have each object react to explosion.
        ObjectListIterator i(&list)
        for (i.first(); !i.isDone(); i.next())
          
          i.currentObject() -> onExplosion()

        end for
        ...

      end if

• What type of binding is the call to onExplosion() known as? What are it’s properties? To put it another way, when does the binding happen and the event known?

3. What’s the problem with using the binding in #2 for a general purpose game engine?

Hand-in

Submit your answers:

https://wpi.qualtrics.com/jfe/form/SV_2ovpcEWigwwI32K

Make sure to include the names of all group members.

Happy event-ing!

– Mark