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Learn how to use the Motion Tween in Adobe Flash CS3.
Tags:adobe,adobe flash cs3,motion tweens,rules of motion tweens,total training,tutorial
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Now in setting up our animation, we don't want to set key-frames for each particular movement of the car. We are, of course, going to be using a Tween. So let's review the rules of Tweens. Now there are two kinds of Tweens that we can use inside of Flash. In this chapter, we are going to be taking a look at motion tween specifically. Let's set up a Motion Tween for our car.
Now there is only a couple of rules for motion tweens but we have to make sure that these two rules are satisfied otherwise our tween is not going to work. The first one is, what kind of object we are tweening and very specifically, we cannot tween a shape object. Now if I go back to our car, we can even see by the crosshatch here, that we have got a lot of shapes being used in this layer. So we are going to have to package things up. Now the second rule of motion tweens is that we can only have one object per layer. To satisfy that rule, we are going to need to do the same thing. We are going to need to package all these shapes up, so that we have one continuous object that we are working with.
Now you can use a lot of things in Flash and the tween will work but the best thing that we are going to be able to choose here is a symbol. So I am going to select everything in that layer, we are going to go up to Modify>Convert to Symbol. This will be our next most used keyboard shortcut for animating in Flash, F8. Now, of course, we are going to give this symbol a name. I will just call it car, we are going to choose what Type of symbol, I will leave that at Movie clip for right now. We can set a Registration for our symbol as well. We can move this around by just clicking on the boxes and select, for instance, the center box to indicate that the registration point should be in the center.
Now for our particular animation, it's not really going to matter where the registration point is, but you maybe want to be thinking about what it's going to do the object. Specifically, rotation is going to use that registration point as a pivot point for the rotation of the object in your tweens. We will just click OK to finish out that Movie clip symbol. Now we have satisfied all the rules. We have something that's not a shape, preferably a symbol in the layer and we only have one object in the layer.
Now let's go ahead and setup our other layers for the tweens as well. I am going to pick out the shrubs layer. Now as we saw before, this is a Bitmap graphic, it's all little leaves dropped in here in the shape of the shrub that we are going to be using and a transparent background, but if we select that graphic and take a look at in the Properties window, we can see that it's a Bitmap.
Now technically, this layer satisfies the rules what we need for a Motion Tween. We have something that is not a shape and we only have one object in the layer, but I would actually recommend in this case, that we go ahead and make a symbol out of it, anyway. I am going to press F8, I will choose the symbol Type, we will give it a name, I will just call it shrub, we will leave the Registration point in the center and I will click OK.
Now the big reason that I did that is that, with symbols we get extra properties. We can set an Alpha on it, we can set a Tint. With movie clips specifically, we get even more properties, we get Blend modes and we get Filters. With a normal Bitmap, I would get none of these. So what we are basically doing is setting it up, so that if we needed any of those properties later, we are all ready to be able to use them by making this into a symbol right from the very beginning.
Now a lot of people even think of motion tweens this way. The only thing that are going to motion tween is the symbol. That's not a bad way to go about setting up your movie files. Now let's take a look at the buildings layer. The buildings layer, we are going to need to do something because we have got three objects in this layer and we need one object per layer. So once again, F8, we will make a symbol, I will leave it at Movie clip, I will call this one buildings. I will leave the Registration point in the center. Let's take a look at our last layer here, the sky bkgnd.
Once again, we have got that same issue. We have got two objects in the layer, the sky and the mountains. With one click on the layer, I have selected both. So all we have to do is press F8 and we will give that symbol the name background, I will leave it as a Movie clip just like the others and the Registration point in the center. Now we are pretty much ready to start our motion tweens.