SDL_GetJoystickBall - Get the ball axis change since the last poll.

       This function is available since SDL 3.2.0.

       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.

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.

       Defined in SDL3/SDL_joystick.h

       SDL_GetJoystickBall - Get the ball axis change since the last poll.

       Returns true on success or false on failure; call

       SDL_GetError () for more information.

•(3), SDL_GetNumJoystickBalls(3)

Simple Directmedia Layer                           SDL 3.2.10                             SDL_GetJoystickBall(3)

#include"SDL3/SDL.h"boolSDL_GetJoystickBall(SDL_Joystick*joystick,intball,int*dx,int*dy);