how to let cursor move with the changing curve, but its Y axis stays the same?

[huangd2]

for instance, each time i do data acquisition, the curve changes, it will always cross y=1 at  one point.  i need to show this point automaticly each time finish acquisition, in order to show its x value.

Many thanks!!!   ^.^

[Weiyuan]

Right click the waveform graph in block diagram -> create -> Property node -> cursor -> cursor position -> Cursor Posx

Because you know the curve, you can specifiy the Cursor PosY also.

[huangd2]

Thank you! but...seems somewhere wrong with my program, PosY of the cursor is still not fixed....