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Up until this point, the motion tweenings that you've constructed are simple stop and go's. They start on the very first key frame, they move to the end key frame where they stop and they move at the same speed throughout the entirety of the animation. Here's an animation that represents what you've learned so far. You have a circle, in this case, moving from the left hand side of the Stage to the right hand side. It moves at the same speed throughout. There's a feature on Flash called the easing that allows you to control how fast or slow Flash moves in and out of key frames.
Now, in my opinion, that's a really important and useful feature because it allows you to make your animations interesting. Things that move at a constant speed really aren't that interesting to look at. Whereas, if you have an animation that slows down, or speeds up it's much more interesting to look at. So, here is a motion tween that I've constructed already because it represents something that you already know how to do. So to get started on this exercise, go ahead and create your own motion tween similar to the one that I have here. Then, simply select the very first key frame of your animation and then in your Properties Inspector, below the Tween Pull Down Menu where you specify to make it a motion tween there is a field for ease.
And there's also a slider next to it. Click on that slider and drag it all the way up to one hundred. When you do that, next to the Easing slider that says Out, this is called an ease out. If you press Return or Enter on your keyboard you can see what effect that has in the animation. On the very first key frame of our animation, an ease out will make the animation start off at normal speed but then slow down as it reaches the next key frame in that animation. So here's what it looks like now.
As you can see, it didn't move at a constant speed throughout the animation, it actually slowed down at the end. Then, go back and select the first key frame again and this time change the Easing slider so that it's all the way down at the bottom - negative one hundred. When you do that and you can see that instead of saying out now says in. This is called an ease in. If I press Return or Enter on my keyboard you can see what effect this has in the animation. It starts off slow and then goes fast as it approaches the next key frame in the animation.
So it does the opposite of what the ease out did. So easing in and out of animations allows you to control and again this doesn't have to be on the very first key frame. You can also apply easing to other key frames in your animation and by doing that, it allows you to be able to alter how fast Flash moves these symbols in and out of key frames in the animation making it much more visually interesting to look at. Another thing to keep in mind if I could back and select that first key frame is that you don't have to set the easing all the way to negative one hundred or all the way up to positive one hundred.
You can also have fine tuning control by setting it anywhere along those two points. So if you only want it to slow down a little bit as it nears the next key frame in the animation, you can set the easing to forty. It doesn't have to be all the way up at one hundred.
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