New video at:
http://www.loriswave.altervista.org/index.php?w=english
I have added a curve option, so you can choise from straight line and curve.
Next step is save and load information of line, color, control tension and bias on single point.
I don't find option for have a line always in front of other object and a sistem for work in 2d like a glas on screen ( like a slider for exemple ), if someone can suggest something I would be very grateful.