SDL_!JoyBallEvent?

SDL_!JoyBallEvent?

NAME STRUCTURE DEFINITION STRUCTURE DATA DESCRIPTION SEE ALSO

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?