Page 272 - Scratch Programming Playground

this duplicated sprite Crab. then, in the Costumes tab, click
the Choose costume from library button, select the crab-a
costume, and click OK. then open the Costume Library again
and select the crab-b costume.
the Crab sprite will still have all the Cat sprite costumes
(Stand, Fall, Walk1, and so on). delete these Cat sprite cos-
tumes, including the hitbox costume. Create a new hitbox
costume that is the right size for the crab. here’s what the
hitbox costume should look like (the crab-a costume has been
placed over it so you can see the relative size, but the costume
is just the black rectangle).

19. Create the Enemy Artificial Intelligence

In games, artificial intelligence (AI) refers to the code that con-
trols the enemies’ movements and how they react to the player.
In the platform game, the aI for the crabs is actually pretty
unintelligent: the crabs will just move around randomly.
In the orange Data category, click
the Make a Variable button and
create a for this sprite only variable
named movement. the movement
variable will store a number repre-
senting the Crab sprite’s movements:
1. Walk left
2. Walk right

246 Chapter 9