Move sprite in parallel with rotated sprite (p2)

[keke]

Using P2 Physics, what's the best way to move a sprite, similar to sprite.body.moveRight, sprite.body.moveLeft but in parallel with another sprite that has a rotation (which constantly changes). 

I want to be able to move the purple line up and down along the yellow line, in parallel and at a fixed distance while they both rotate.

Anya ideas?

 

Thanks