I have been looking around everywhere for a way to do this. Essentially I would like to be able to control the speed of a null using a slider.
Something similar to:
But something that works. I realise that I may have to calculate all the position values before the current time in order to calculate the new position...but I have no idea how to work that out.
I should add that I would like to be able to ramp the speed....
Any further reading, advice or links would be much appreciated.