DragonFly On-Line Manual Pages

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 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_JoystickGet-
       Ball

SDL			    Tue 11 Sep 2001, 22:59	   SDL_JoyBallEvent(3)