redhat man page for sdl_joyballevent

SDL_JoyBallEvent(3)						 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 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)