NAME¶

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

HEADER FILE¶

Defined in SDL3/SDL_joystick.h

SYNOPSIS¶

#include "SDL3/SDL.h"

bool SDL_GetJoystickBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);

DESCRIPTION¶

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.

FUNCTION PARAMETERS¶

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.

RETURN VALUE¶

Returns true on success or false on failure; call

SDL_GetError () for more information.

AVAILABILITY¶

This function is available since SDL 3.1.3.

SEE ALSO¶

•(3), SDL_GetNumJoystickBalls(3)