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Resize or Combine Flash CS5 Tween Spans

If you want a tween in Adobe Flash Creative Suite 5 to have a longer or shorter duration or to have more time for additional keyframes and motion, you can expand the number of frames in a tween span.

By default, the length of each new tween span is based on the frame rate. A frame rate of 24 frames per second (fps) creates a 24-frame tween span every time, a frame rate of 30 fps creates a 30-frame tween span, and so on.

Change the Length of Tween Spans in Flash CS5

Alter the length of your animations by placing starting and ending keyframes closer together or farther apart. To expand or trim a tween span, follow these steps:

  1. Locate and select a tween span on the Timeline and select the last frame in the span.

  2. Move the cursor over the last frame of the span until a double-arrow icon appears.

  3. Click and drag left or right to trim or lengthen the span, respectively.

If you resize a tween span after animation already has been created, existing keyframes shift from their original positions on the Timeline, which causes certain animations to begin or end at different times than you originally intended.

Join Multiple Tween Spans in Flash CS5

The beauty of the Adobe Flash Creative Suite 5 tween engine is that you no longer need to create several tweens or keyframes to have lots of different Flash motion changes. You can create several different movements, transformations, and color effects sequentially within a single tween span.

You may, on occasion, end up with two or more tween spans back-to-back, especially if you copy and paste tween spans. You can, however, easily join or combine tweens into a single span for easier editing and tweaking.

Follow these steps to join multiple tween spans:

  1. While holding down the Shift key, click and select two or more consecutive tween spans on a single layer.

  2. Right-click (Windows) or Control-click (Mac) any selected tween and then choose Join Motions from the contextual menu that appears.

    The tween spans are joined as one. You can now edit the tween span as a whole directly on the Timeline or by using the Motion Editor.

You can undo joined motion by choosing Split Motion from the Timeline’s contextual menu.

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