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Hour 14. Animate with Timelines > Control Layer Properties with Timelines

Control Layer Properties with Timelines

So far this hour you have manipulated the positioning of layers with a timeline. You can manipulate other layer attributes too. What if you wanted a number of layers to appear over a period of time? You create a timeline, add keyframes, and change the visibility attribute when a keyframe is selected. To create a timeline that changes layer visibility over time:

  1. Create five layers and line them up on the page. Name them sequentially, like L1, L2, L3, L4, and L5. All of the layers' visibility should be set to visible (or default).

  2. Drag each layer into its own channel in the Timeline inspector as shown in Figure 14.16.

    Figure 14.16. All five layers reside in their own channels in the Timeline inspector.

  3. Drag the end keyframes so that the animation bar in a channel is five frames longer than the animation bar in the channel above it. The Timeline inspector should look like Figure 14.17.

    Figure 14.17. Each animation bar is five frames longer than the animation bar in the previous channel.

  4. Position the playback head on the first frame. Open the Layer palette and hide all of the layers (click in the eye column until there is a closed eye).

  5. Make sure you select Autoplay and then preview the timeline in the browser.


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