Page 85 - Learn To Program With Scratch

We then covered the commands in the Sound palette and explained
how to play audio files, drum sounds, and musical notes. You created a
complete dance scene with commands from both the Looks and the Sound
palettes, and you finished with a bang by making a fireworks animation
application.
In the next chapter, you’ll learn how to coordinate the work among
different sprites using message broadcasting and receiving. You’ll also
learn how to break up a large program into smaller and more manageable
pieces, called procedures. This concept is the key to writing more complex
applications.

Problems

Zebra .sb2 1. Open the application Zebra.sb2, shown below. The application contains
a single sprite (the Zebra), which has three costumes. Write a script that
makes the Zebra move across the Stage and switch among its costumes
to create the illusion of running.

Zebra sprite
has three costumes.

Wolf .sb2 2. Open the application Wolf.sb2, shown below. When you click the green
flag, the Wolf will play the WolfHowl sound, which takes about 4 seconds.
Create a script that changes the Wolf’s costumes in sync with the sound.
(Hint: Insert a wait block with an appropriate time delay after each cos-
tume switch.)

Wolf sprite has
three costumes.

Looks and Sound 63

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