Unfold
Unfolds a shape step by step to a straight line.
To animate a unfolding (or folding) of your paths, simply link the "completion" parameter to a slider and keyframe it from 0 to 100 (or 100 to 0).
With the "Gradually" parameter you can control is the entire shape should unfold at once or make the process directional and start the folding on one end of the path.
Examples
Download at aescripts.com