OptionalextraOptionalhighlightsuse GamepadDisplayJoystick.extraData with a custom DisplayGamepadConfig.joystickDisplayFunction instead, see the custom gamepads example/demo
OptionalxAxis index (as returned by the browser gamepad api) to track for the horizontal movement of the display joystick see standardGpadAxesMap
OptionalyAxis index (as returned by the browser gamepad api) to track for the vertical movement of the display joystick see standardGpadAxesMap
optional, for your own use