rojohound Thanks for the response,Ah the third point is probably what I'm missing...
I am trying to calculate the trajectory of a missile/artillery
I have the projectiles origin x,and the target x,the "ceiling" of the curve may have to be squashed down to keep it in the constraints of the layout,but if that is not possible I could probably work around that..
Your equation may help, however I am unsure how to calculate that third point...
Maths and algebra are not my strong point...
Again thanks...