Game controller axis motion event structure (event.caxis.*)
Defined in SDL_events.h
typedef struct SDL_ControllerAxisEvent
{
Uint32 type; /**< SDL_CONTROLLERAXISMOTION */
Uint32 timestamp; /**< In milliseconds, populated using SDL_GetTicks() */
SDL_JoystickID which; /**< The joystick instance id */
Uint8 axis; /**< The controller axis (SDL_GameControllerAxis) */
Uint8 padding1;
Uint8 padding2;
Uint8 padding3;
Sint16 value; /**< The axis value (range: -32768 to 32767) */
Uint16 padding4;
} SDL_ControllerAxisEvent;