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A free derivative of BSD Unix, 1992BSD, was released in 1992 and led to the NetBSD and FreeBSD projects.
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sdl_joyballevent(3) [opensolaris man page]

SDL_JoyBallEvent(3)						 SDL API Reference					       SDL_JoyBallEvent(3)

SDL_JoyBallEvent - Joystick trackball motion event structure STRUCTURE DEFINITION
typedef struct{ Uint8 type; Uint8 which; Uint8 ball; Sint16 xrel, yrel; } SDL_JoyBallEvent; STRUCTURE DATA
type SDL_JOYBALLMOTION which Joystick device index ball Joystick trackball index xrel, yrel The relative motion in the X/Y direction DESCRIPTION
SDL_JoyBallEvent is a member of the SDL_Event union and is used when an event of type SDL_JOYBALLMOTION is reported. A SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick. The field which is the index of the joystick that reported the event and ball is the index of the trackball (for a more detailed explaination see the Joystick section). Trackballs only return rela- tive motion, this is the change in position on the ball since it was last polled (last cycle of the event loop) and it is stored in xrel and yrel. SEE ALSO
SDL_Event, Joystick Functions, SDL_JoystickEventState, SDL_JoystickGetBall SDL
Tue 11 Sep 2001, 22:59 SDL_JoyBallEvent(3)

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