SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Get the ball axis change since the last poll.


int SDL_JoystickGetBall(SDL_Joystick *joystick,
                        int ball, int *dx, int *dy);

Function Parameters

joystick the SDL_Joystick to query
ball the ball index to query; ball indices start at index 0
dx stores the difference in the x axis position since the last poll
dy stores the difference in the y axis position since the last poll

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


Trackballs can only return relative motion since the last call to SDL_JoystickGetBall(), these motion deltas are placed into dx and dy.

Most joysticks do not have trackballs.


This function is available since SDL 2.0.0.


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