Spline Tool Line Drawer

I have a basic spline actor set up with repeating black planes - I want to be able to have these triggered and added by a touch event (drawing on the screen with a finger) in which the spline would appear.

Basically, I’m designing a game where drawing with a line tool is necessary, can anyone help me with this?

Blueprint: http://blueprintue.com/view/8xtdV6Bv/