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Hour 12. Animating Using Movie Clip and ... > Movie Clip Symbol Behavior

Movie Clip Symbol Behavior

Some people wrongly think that Graphic symbols are only for when the symbol contains a single frame and Movie Clip symbols are only for when you have multiple frames. The differences go much deeper than that. The best approach is to simply always use Movie Clips unless you have a reason to use Graphic symbols (which you'll learn this hour). The first thing to learn is that both Movie Clips and Graphic symbols can contain one or more frames. However, only Movie Clips will automatically loop regardless of where you place instances of that clip.

Here's an example of how Movie Clips will automatically loop: Say you make a Movie Clip of a wheel (a circle with lines for spokes). You can then use an instance of your Wheel symbol inside another Movie Clip called Rotating Wheel—where the Wheel symbol rotates. Then you can create another movie clip that serves as the Car (which includes two instances of the Rotating Wheel symbol). Because the Rotating Wheel is a Movie Clip, the wheels will rotate whether you put them on stage or inside the Car. Finally, the Car symbol can be animated across the screen, and both wheels will rotate the whole time. Don't worry if this is confusing; you'll do a task next to make it clear. Just remember, you can use movie clips even when you don't need multiple frames.


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