1) take the center of a major swing 2) mesure back and 3) project it forward.
Observe how price is acting/reaction at the R-Lines.
This is the same principle like: "If you push to a wall, the wall is pushing back."
On my new Blog-Post for registered FreeFTG members, I'm going into details about this technique that stem from Newtons 3rd law of motion, and adapted to the charts by Dr. W. Babson, who made a fortune and started the Babson Collage.
It pays out to know more then just common trading knowledge...