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 3.2.0.