Get the current state of an axis control on a joystick.
Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick,int axis);
|joystick||an SDL_Joystick structure containing joystick information|
|axis||the axis to query; the axis indices start at index 0|
Returns a 16-bit signed integer representing the current position of the axis or 0 on failure; call SDL_GetError() for more information.
SDL makes no promises about what part of the joystick any given axis refers to. Your game should have some sort of configuration UI to let users specify what each axis should be bound to. Alternately, SDL's higher-level Game Controller API makes a great effort to apply order to this lower-level interface, so you know that a specific axis is the "left thumb stick," etc.
The value returned by SDL_JoystickGetAxis() is a signed integer (-32768 to 32767) representing the current position of the axis. It may be necessary to impose certain tolerances on these values to account for jitter.
This function is available since SDL 2.0.0.