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SDL Wiki


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Get the ball axis change since the last poll.


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

Function Parameters


the SDL_Joystick to query


the ball index to query; ball indices start at index 0


stores the difference in the x axis position since the last poll


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.

Code Examples

int delta_x, delta_y;
SDL_Joystick *joy;
if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1)
  printf("TrackBall Read Error!\n");
printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);

CategoryAPI, CategoryJoystick, CategoryDraft

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