Page 59 - Learn To Program With Scratch

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Note:
Drag the when space
key pressed block from
the Events palette and
then select the desired
key from the drop-down
menu.

Figure 2-17: The scripts for the Player sprite

When the player clicks the green flag, this sprite moves to (–30,–30) u
and points to the right v. The other four scripts respond to the arrow keys.
When an arrow key is pressed, the corresponding script changes the sprite’s
direction w, plays a short sound (using the play sound block x from the
Sound palette), and moves the sprite 60 steps y. The sprite bounces off the
Stage’s edge z if needed. Because 60 steps correspond to 1 square on the
grid of Figure 2-16, each time you press an arrow key, the Player sprite moves
1 square.

n o t e Have you noticed that the four arrow-handling scripts in Figure 2-17 are almost iden-
tical? In Chapter 4, you’ll learn how to avoid duplicating code this way.

Go ahead and test this part of the game. You should be able to move the
Player sprite around the Stage using the arrow keys on your keyboard. Once
you have that working, we’ll move on to the Gold sprite, whose script is shown
in Figure 2-18.

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Figure 2-18: The script for the Gold sprite

Motion and Drawing 37

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