Sets the transparency of the virtual joystick on screen. The virtual joystick is composed of two parts the inner movable part, and the outer static part. Alpha1 sets the transparency of the outer part in the range 0-255 with 255 being fully opaque. Alpha2 sets the transparency of the inner part in the range 0-255.
SetVirtualJoystickAlpha( index, alpha1, alpha2 )
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