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Hour 8. Using Motion Tween to Animate > Task: Make an Animation Finish Where It...

Task: Make an Animation Finish Where It Starts

1.
In a new file, draw a circle.

2.
Select the circle and convert it to a symbol (select Insert, Convert to Symbol or press F8). Call it Yo-Yo, leave the default Movie Clip behavior, and click OK.

3.
Position the yo-yo in its starting position, near the top of the screen.

4.
Click the Timeline on frame 10 and insert a keyframe (select Insert, Keyframe or press F6).

5.
Before you move anything, click the Timeline on frame 20 and insert another keyframe. At this point you should have three identical keyframes.

6.
Now position the red current frame marker on frame 10 and move the yo-yo down to the bottom of the stage. (Clicking the keyframe in frame 10 not only moves the current frame marker but also selects all the onstage contents of this frame.)

7.
Now we only need to set Motion Tween for frame 1 (which specifies how to tween to frame 10) and for frame 10 (which specifies how to tween to frame 20). You can use the right-click method if you want. To set tweening for two keyframes (1 and 10) at the same time, click the keyframe in frame 1, hold Shift, and then click the keyframe in frame 10. Access the Properties panel and you can set tweening for both keyframes (see Figure 8.8). Select Motion.

Figure 8.8. The Properties panel affects every keyframe selected.


8.
Select Control, Test Movie (or press Ctrl+Enter). Save the animation; we'll add to it in a minute.

Let's step back and consider what we did. We made sure the first and last keyframes were identical before editing the middle keyframe. It's very common in animation to establish the ending keyframes first before editing the initial frames. We did it here so that the first and last keyframes contained Yo-Yo in the same position; in Hour 21 there's a whole section dedicated to this technique.


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