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Chapter 8. Animating with Motion Tweenin... > Understanding Frame and Instance Pro...

Understanding Frame and Instance Properties

There is a difference between frame properties and instance properties. This is a source of initial confusion when dealing with animation tweens (both motion and shape). Because the Property Inspector is context-sensitive, it displays properties for many different objects in Flash depending on which of these objects is selected.

Motion (and shape) tweens are applied to keyframes in the Timeline. Color and Transform effects are applied to instances on the Stage. To view the motion tween properties for a specific frame or keyframe, you must select that frame. It is here that you activate tweening and tell Flash what you are going to tween (such as scale or rotation). This needs to be differentiated from the effects you apply to the instances in the tweened keyframes. These are accessed in the Property Inspector and the Transform panel whenever any instance is selected on the Stage. For example, if you check scale as an option in the tween properties for a keyframe, a change in size only results if the size of one of the instances is changed. Conversely, if you want to tween a change in alpha, you can’t do this by selecting either of the keyframes in a tween; you must select the instance on the Stage and apply the alpha change when the instance properties appear in the Property Inspector.


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