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SDL_JoystickGetBall(3)		SDL API Reference	  SDL_JoystickGetBall(3)

NAME
     SDL_JoystickGetBall - Get relative trackball motion

SYNOPSIS
     #include "SDL.h"

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

DESCRIPTION
     Get the ball axis change.

     Trackballs can only return relative motion since the last call to	SDL_Joy-
     stickGetBall, these motion deltas a placed into dx and dy.

RETURN VALUE
     Returns 0 on success or -1 on failure

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

SEE ALSO
     SDL_JoystickNumBalls

SDL			     Tue 11 Sep 2001, 23:00	  SDL_JoystickGetBall(3)

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<https://man.freebsd.org/cgi/man.cgi?query=SDL_JoystickGetBall&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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