Pressure-sensitive pen pressure / angle event structure (event.paxis.*)
Defined in <SDL3/SDL_events.h>
typedef struct SDL_PenAxisEvent
{
SDL_EventType type; /**< SDL_EVENT_PEN_AXIS */
Uint32 reserved;
Uint64 timestamp; /**< In nanoseconds, populated using SDL_GetTicksNS() */
SDL_WindowID windowID; /**< The window with pen focus, if any */
SDL_PenID which; /**< The pen instance id */
SDL_PenInputFlags pen_state; /**< Complete pen input state at time of event */
float x; /**< X coordinate, relative to window */
float y; /**< Y coordinate, relative to window */
SDL_PenAxis axis; /**< Axis that has changed */
float value; /**< New value of axis */
} SDL_PenAxisEvent;You might get some of these events even if the pen isn't touching the tablet.
This struct is available since SDL 3.2.0.