Page 79 - Learn To Program With Scratch

Dancing on Stage

DanceOnStage In this section, you’ll animate a Dancer sprite on the Stage. This appli-
.sb2 cation is illustrated in Figure 3-10, and the complete script is saved as
DanceOnStage.sb2. We’ll build the whole scene right here—follow along
to see how it works!

The Ball sprite changes its color like a
disco ball.
The Board sprite also changes color to
simulate the spotlights.
The Dancer sprite will dance on the Stage
to music.

The SpotLight sprite will follow the
dancer as he moves around.
Stage background

Figure 3-10: The Dance Party application in action .

First, start a new project. If Scratch is not already running, all you
have to do is start it—this will automatically create a new project for you.
Otherwise, select New from the File menu. In both cases, you’ll have a new
project that contains the default Cat sprite.
The backdrop that you’ll use in this application is the party room
from the Indoors category. Import this backdrop and delete the default
white backdrop, which you won’t need. The Stage should now look like
Figure 3-11.

Later, we’ll grab this part of
the Stage and create the
Ball sprite from it.

We’ll also grab this part of
the Stage and create the
Board sprite from it.

Figure 3-11: We’ll turn some sections of the party-room backdrop into sprites later .

Examine Figures 3-10 and 3-11 carefully and notice how the Ball and
Board sprites look like parts of the backdrop. As you’ll see in a moment,
these two sprites were actually created from that image and placed on the
Stage to cover the sections they came from. Creating the two sprites this
way lets us change their color and make the Stage more realistic.

Looks and Sound 57

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