Provide a reset or recenter function

[ebabcock1]

While the parameter autoReturnToCenter=false is handy for preserving the joystick position, I would like the ability to force the joystick to return to center, or even to a specific position. I am using a joystick to control multiple robot joints, one at a time (as there isn't enough real estate to display multiple joysticks), and would like to restore the joystick position after switching the joint the joystick is controlling.

I would like to see a function (or more) called reset(), returnToCenter(), or setPosition(x,y) that would set the joystick to the initial (center) position or a specific position. I would call such a function when switching controls.

Since the joystick position is read-only, there is no way to change it. I could destroy the joystick and recreate it, but that seems wasteful, I could also use hidden elements for multiple joysticks, but just complicates the user interface.