Get the ball axis change since the last poll.
Defined in <SDL3/SDL_joystick.h>
bool SDL_GetJoystickBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);| SDL_Joystick * | joystick | the SDL_Joystick to query. |
| int | ball | the ball index to query; ball indices start at index 0. |
| int * | dx | stores the difference in the x axis position since the last poll. |
| int * | dy | stores the difference in the y axis position since the last poll. |
(bool) Returns true on success or false on failure; call SDL_GetError() for more information.
Trackballs can only return relative motion since the last call to SDL_GetJoystickBall(), these motion
deltas are placed into dx and dy.
Most joysticks do not have trackballs.
This function is available since SDL 3.2.0.