###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.) # SDL_JoystickSetVirtualAxis Set values on an opened, virtual-joystick's axis. ## Header File Defined in [SDL_joystick.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_joystick.h) ## Syntax ```c int SDL_JoystickSetVirtualAxis(SDL_Joystick *joystick, int axis, Sint16 value); ``` ## Function Parameters | | | | | ------------------------------ | ------------ | ------------------------------------------------- | | [SDL_Joystick](SDL_Joystick) * | **joystick** | the virtual joystick on which to set state. | | int | **axis** | the specific axis on the virtual joystick to set. | | [Sint16](Sint16) | **value** | the new value for the specified axis. | ## Return Value (int) Returns 0 on success, -1 on error. ## Remarks Please note that values set here will not be applied until the next call to [SDL_JoystickUpdate](SDL_JoystickUpdate), which can either be called directly, or can be called indirectly through various other SDL APIs, including, but not limited to the following: [SDL_PollEvent](SDL_PollEvent), [SDL_PumpEvents](SDL_PumpEvents), [SDL_WaitEventTimeout](SDL_WaitEventTimeout), [SDL_WaitEvent](SDL_WaitEvent). Note that when sending trigger axes, you should scale the value to the full range of [Sint16](Sint16). For example, a trigger at rest would have the value of [`SDL_JOYSTICK_AXIS_MIN`](SDL_JOYSTICK_AXIS_MIN). ## Version This function is available since SDL 2.0.14. ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryJoystick](CategoryJoystick)