getBall method
Get the ball axis change since the last poll.
Implementation
Point<int> getBall(final int ball) {
sdl.checkReturnValue(
sdl.sdl.SDL_JoystickGetBall(handle, ball, sdl.xPointer, sdl.yPointer),
);
return Point(sdl.xPointer.value, sdl.yPointer.value);
}