Hi Everyone!
I have a little bit of trouble with this bit of code.
It's using the Ketai library for touch support, but the problem is just about basic geometry I fear.
A line is drawn following the flick of the finger (x,y being the starting position and px, px being the end position) .
What I am trying to achieve is for the line to ''delete itself'' by moving the starting point towards the end point.
What happens though, is that the line is drawn ''backwards''.
