Star Wars with Blockly - Hour of Code: Events

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Well, hello, my name is Charita Carter. I'm
a senior creative producer here at Walt Disney

Imagineering. I'm responsible for leading
teams that actually produce the attractions

that our guests get to experience. We are
always looking for ways that we can improve

and make a better experience for our guests
and technology is at the heart of that.

Congratulations, you did it! You programmed
BB-8. Now I think we're ready for something

harder. Let's go for it. Now that you've learned
the basics of programming, we're going to

back in time to build your own game, starring
R2-D2 and C3PO. To make a game, we need to

learn about something that game programmers
use every day: they're called events.

Events tell your program to listen or wait
for when something happens and then when it

does, it performs an action. Some examples
of events are listening for a mouse click,

an arrow button or a tap on the screen. Here
we're going to make R2-D2 move up to deliver

a message to a rebel pilot and then move down
to the other rebel pilot.

We'll use events to make him move. When the
player uses the up/down arrow keys, or the

up/down buttons. We use the when up event
block and attach the go up block to it. When

the player presses the up arrow key, the code
attached to the when up block is run. And

we'll do the same thing to make R2-D2 move
down.

Now instead of writing all the code to control
our droid in advance, we can let R2-D2 react

to button press events that move him around
the screen. Step by step, your game is getting

more interactive.