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