这是来自joystick.c的相关代码块(通过SVN,位于http://svn.seul.org/viewcvs/viewvc.cgi/trunk/src/joystick.c?view=markup&revision=2652&root=PyGame)
value = SDL_JoystickGetHat (joy, _index);
#ifdef DEBUG
printf("SDL_JoystickGetHat value:%d:\n", value);
#endif
if (value & SDL_HAT_UP) {