visual analog scale (VAS)

[lncs]

I think it would be easy to conceptulize if you think about a child's flip book, the main difrence being this could scroll either up or down depending on the the arrow key that is pressed.

If this is imposble to do in DirectRt, how would it look (accepting a screen refresh bettween frames) if you had unique trial for each frame.

I have attached 11 images that could be used to make a proof of concept.