Thanks chrisbobs, your catapult project is helping me alot.
I've been trying to add a launch guide upon dragging the pole back. The guide is a long, straight arrow sprite that should stretch out further when the catapult is drawn further back.
Been tweaking the position/angle/width of the 'elastic' sprite just to test, but I still can't arrive at the right formula.
Can I get some help on like arriving at a solution?