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Is it possible in keynote 09 to stretch a line through an animation without making it more broadly?

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I would do the animation of the line as a Magic Move. To do that, start with the line on a slide. In the Slide Navigator, duplicate the slide. On the second slide, adjust the length of the line (and position if you wish). Select the first slide in the Slide Navigator and apply the Magic Move transition.

I like using Magic Moves for things like this because it makes it easier to deal with multiple elements on the slide.

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If the line ends at the edge of the screen, easy: make the line the full width needed, put most of it off-screen and animate in with a move.

If the line doesn't go all the way to the edge, you'll need to do a similar thing, but with some fakery. Remove the line and take a screenshot of the area between where the line starts and the edge of the screen. Make the line the full width needed and replace to where it should be initially, leaving the tail trailing off-screen. Then, put the screenshot of the background back on the slide atop the line to hide the line's tail.

If you have other animating objects over where the line's tail is, make sure the line and the fake background are below them so they don't intermittently disappear. With many objects it can be tricky, but definitely doable!

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Or just create another two lines (or anu other object) with the same color as the background and place them at the beginning and end of the to be animated line (up to the edge) (instead of making a screenshot). Might also not work in any case, but is probably a bit easier to do (also considering other changes that might be done to the slide). –  Felix May 5 '11 at 17:14
    
@Felix That works, too, unless you have a pattern or image as background. –  CajunLuke May 5 '11 at 18:30
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