Page 80 - Learn To Program With Scratch

Now we need some background music. Let’s use the medieval1 file
from the Music Loops category. Import this file to the Stage and then
delete the default “pop” sound. Next, add the script in Figure 3-12 to the
Stage. It uses the play sound command along with a wait time that lets the
audio file restart smoothly. The wait time of 9.5 seconds was selected by
experimentation.

Duration of the audio
clip (9.6 seconds)

Figure 3-12: The Stage plays our background music .

Click the green flag to test what you’ve created so far. You should hear
an audio clip repeating continuously. Stop the script when you’re ready, and
we’ll add our dancer.
Replace the costumes of the Cat sprite
with those of the Dancer. Import the dan-a
and dan-b costumes from the People cate-
gory, delete the two Cat costumes, and
change the Cat sprite’s name to Dancer.
The script for the Dancer is shown in
Figure 3-13.
The Dancer moves 20 steps to the right,
changes its costume, moves 20 steps to the
left, and changes its costume again. These
steps are repeated forever to make him
look like he’s really dancing. The script
also changes the fisheye effect slightly
with every step for some variety. Click the
green flag to test this new addition to
the program. You should hear the back-
ground music and see the Dancer moving
left and right on the Stage. Figure 3-13: This script tells the
Now that you have a dancer for your Dancer sprite how to boogie .
party, let’s add some colorful lights with the
Ball, Board, and SpotLight sprites. To create
the Ball sprite, click the thumbnail of the Stage to select it and then select the
Backdrops tab. Right-click the thumbnail of the party room backdrop and
select save to local file from the pop-up menu. This brings up a dialog that
allows you to save the backdrop image locally. Remember where you saved
this image because you’ll import it back in a moment.

58 Chapter 3
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