Page 81 - Learn To Program With Scratch

Click the Upload sprite from file button (above the Sprite List) and
select the image you just saved. This creates a new sprite whose costume is
the same as the backdrop image. Name this sprite Ball and edit its costume
in the Paint Editor to remove everything but the colorful ball depicted in
Figure 3-14 (left). Be sure to paint the space around the ball with transpar-
ent color. Next, place the Ball sprite on the Stage exactly over the spot in the
backdrop where you took it from so that it looks like part of the image (see
Figure 3-11).

Figure 3-14: The costume for the Ball sprite as it
appears in the Paint Editor and its script

Figure 3-14 also shows the script you should add to the Ball sprite. It
changes the sprite’s color effect continuously to give the illusion that the
small circles are actually changing color.
Create the Board sprite the same way you created the Ball sprite.
Figure 3-15 shows how this sprite should appear in the Paint Editor (left)
and the script you’ll need to animate it (right). I’ve added some colors to
the costume (compare to Figure 3-11) to make the change color effect
command effective.

Figure 3-15: The Board sprite and its script

Because the Board sprite overlaps with the Dancer, the script sends the
Board two layers to the back so the Dancer will always be in the front. You
can do the same thing by selecting the Dancer sprite and clicking the go to
front block from the Looks palette.
The last sprite in this application is the SpotLight sprite. Figure 3-16
shows how this sprite appears in the Paint Editor, as well as the script you
need to create. The center of the image is at the tip of the cone shape,
which represents a light beam.

Looks and Sound 59

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