Stroke reveal? Similar effect in Synfig?

Hey,

I have a few lines I want to mask reveal so my question:

I was wondering if there is a ‘stroke reveal’ type effect. Say if i draw a line with the Spline Tool and then set a parameter for the stroke to move along that spline? Sort of like 0 - 100% ?

Cheers

Have you seen this?
wiki.synfig.org/Doc:Write_On
It is a little outdated (version 0.63.00) but it should still working with any later version.
-G