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Man Pages
SDL_JoyBallEvent(3) SDL API Reference SDL_JoyBallEvent(3)

SDL_JoyBallEvent - Joystick trackball motion event structure

typedef struct{
  Uint8 type;
  Uint8 which;
  Uint8 ball;
  Sint16 xrel, yrel;
} SDL_JoyBallEvent;

type
SDL_JOYBALLMOTION
which
Joystick device index
ball
Joystick trackball index
xrel, yrel
The relative motion in the X/Y direction

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.

SDL_Event, Joystick Functions, SDL_JoystickEventState , SDL_JoystickGetBall
Tue 11 Sep 2001, 22:59 SDL

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