Outbreak Simulator: Events

Now let's learn about a programming concept
called Events.

An event tells your program to listen for
something to happen, and then react right away.

Some examples of events are: listening for
a mouse click, an arrow button press,

or atap on the screen.

We use events all the time as humans, when
we respond to different signals.

When I'm walking down the street, and see
someone else walking towards me, I check to

make sure I'm wearing my mask correctly.

When we develop a simulation, we create a
series of rules.

For this simulation, we'll code this rule:
When a healthy monster touches a sick monster,

the healthy monster will become sick.

Here is a "when touches" event.

Click the small blue plus sign here, on this
block.

It will show 2 new blocks called Subject,
and Object.

Drag the purple monster block, into the code
below it.

This code is telling the computer that when
a healthy monster meets a sick monster, the

healthy monster will change its costume, to
look like a sick monster.

Click "run" to watch your simulation play
out.

Run your program a few times, and observe
the differences.