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.TH SDL_GetJoystickBall 3 "SDL 3.1.0" "SDL" "SDL3 FUNCTIONS"
.SH NAME
SDL_GetJoystickBall \- Get the ball axis change since the last poll\[char46]
.SH SYNOPSIS
.nf
.B #include \(dqSDL3/SDL.h\(dq
.PP
.BI "int SDL_GetJoystickBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);
.fi
.SH DESCRIPTION
Trackballs can only return relative motion since the last call to

.BR SDL_GetJoystickBall
(), these motion deltas are
placed into
.BR dx
and
.BR dy
\[char46]

Most joysticks do not have trackballs\[char46]

.SH FUNCTION PARAMETERS
.TP
.I joystick
the 
.BR SDL_Joystick
 to query
.TP
.I ball
the ball index to query; ball indices start at index 0
.TP
.I dx
stores the difference in the x axis position since the last poll
.TP
.I dy
stores the difference in the y axis position since the last poll
.SH RETURN VALUE
Returns 0 on success or a negative error code on failure; call

.BR SDL_GetError
() for more information\[char46]

.SH AVAILABILITY
This function is available since SDL 3\[char46]0\[char46]0\[char46]

.SH SEE ALSO
.BR SDL_GetNumJoystickBalls (3)