Is there a way to make keynote "draw" a line over a period of time. In some cases I can "fake" it using a wipe but if the line double backs on itself, it is not what I would like. Suggestions? Enhancement request?

Question

I can fake what I need if the path is something like:
But if the path doubles back on itself, such as:
The wipe does not have the desired effect.  I would think the appropriate name for what I want would be "Draw".  I want the line to be drawn from one end to the other in a specified amount of time.

Answer 1

create 2 draw shapes showing as a single coloured line;
one that shows the line from the starting point at the left to the furthest point it extends to the right
the second line starts from the end point of line 1 to the furthest  point it extends to the left
add a wipe to line 1, wiping from left to right
add a wipe to line 2, wiping from  right to left,  which automatically builds after build 1, with no delay
when played back it will look like a single wipe