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_JoystickGetBall

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