How to show the picker programmatically?

[freshairfly]

There are a ground of trend plots which have the same x axis, and each of them has a picker (see pic).
picker.jpg

Currently, the pickers work separately for each plot. I want to the pickers display/undisplay simultaneously when the mouse is hovering over any of these trend plots.
I searched the forum, and I didn't find a solution.

Any suggestion is welcome. Thank you in advance.

[Uwe]

Well a picker is a state machine and you would have to synchronize the states ( be careful with ping pong effects ).

So in your case probably:

• activated( true )
• moved
• activated( false )

To synchronize the others:

• begin + append
• move
• end

Looking at qwt_picker.cpp should help.

Uwe