1. Event-driven programming
Chapter 5 covers event-driven programming.
Events are user or condition driven and so each event defines a triggering event and an event-handler (a method)
Fall 2009
ACS Ron McFadyen

2. Event-driven programming
Documenting events in storyboards
e.g. Flight simulator program in Chapter 5
Event trigger: spacebar pressed
Event trigger: up arrow pressed
Response:
Roll biplane
Response:
Move biplane forward
Alice programming: a method is executed when event occurs
Fall 2009
ACS Ron McFadyen

3. Event-driven programming
Think of the Alice system having a loop where it continually checks for the occurrence of an event.
When an event occurs the Alice system invokes the event-handler defined for the event.
Fall 2009
ACS Ron McFadyen

4. Event-driven programming
With Alice we can define events in the upper right window:
Fall 2009
ACS Ron McFadyen

5. Event-driven programming
Next we’ll examine the examples of the text:
Air-show flight simulator
Saving people
Greek tragedy
Fall 2009
ACS Ron McFadyen