Man page - sdl_getjoystickball(3)

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Manual

SDL_GetJoystickBall(3) SDL3 FUNCTIONS SDL_GetJoystickBall(3)

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

Defined in SDL3/SDL_joystick.h

#include "SDL3/SDL.h"
bool SDL_GetJoystickBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);

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.

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.

Returns true on success or false on failure; call

SDL_GetError () for more information.

This function is available since SDL 3.2.0.

•(3), SDL_GetNumJoystickBalls(3)

SDL 3.2.10 Simple Directmedia Layer