Hi Peter,
with stick control,is it possible to know and work with X,Y coordinates of the joystick ?
Thanks for your help.

I found !
I used this code to kown the exact position of the joystick :
void   mouseDragged (){
                  int posx = mouseX;
                  int posy = mouseY;
                   println(posx +"  "+ posy); // to see the value
//to do something with posx and posy
}