Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_SetJoystickVirtualBall - Generate ball motion on an opened virtual joystick.
HEADER FILE
Defined in SDL3/SDL_joystick.h
SYNOPSIS
#include "SDL3/SDL.h" bool SDL_SetJoystickVirtualBall(SDL_Joystick *joystick, int ball, Sint16 xrel, Sint16 yrel);
DESCRIPTION
Please note that values set here will not be applied until the next call to SDL_UpdateJoysticks , which can either be called directly, or can be called indirectly through various other SDL APIs, including, but not limited to the following: SDL_PollEvent , SDL_PumpEvents , SDL_WaitEventTimeout , SDL_WaitEvent .
FUNCTION PARAMETERS
joystick the virtual joystick on which to set state. ball the index of the ball on the virtual joystick to update. xrel the relative motion on the X axis. yrel the relative motion on the Y axis.
RETURN VALUE
Returns true on success or false on failure; call SDL_GetError () for more information.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_SetJoystickVirtualBall(3)