[orangekid]

quoted from post #47 to explain how this works.




Just tested on the touch pro. Works.

But, there are limitations.
It can only detect motion of the second point pressed.
If both are pressed at nearly the exact time, it does not work.
If you do move the first finger pressed, the position of the second point is not calculted correctly. I don't really see a way to calculate it correctly, since it isn't really detecting both pressed points.

It's detecting the 2 points were pressed in a very short amount of time.
So, it uses the coordinates of the 1st press, and the registered point of the second press, to calculate where the second finger is based on the first point.

If you draw a line between the 2, the registered point is half way.
So the algorithm is pretty simple.
Something like:

2 * (2nd registerd point(xM,yM) - 1st press (x1,y1) ) + (x1, y1) = (x2,y2)

where (x1,y1) is actual position of finger 1
where (x2,y2) is actual position of finger 2
where (xM,yM) is actual position regsitered when the 2nd finger is added.