Manual Pages for UNIX Operating System command usage for man SDL_JoyBallEvent

SDL API Reference                             SDL_JoyBallEvent(3)



NAME
     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  track-
     ball  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  relative  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            Last change: Tue 11 Sep 2001, 22:59              1