(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_TouchFingerEvent

Touch finger event structure (event.tfinger.*)

Header File

Syntax

typedef struct SDL_TouchFingerEvent
{
    SDL_EventType type; /**< SDL_EVENT_FINGER_MOTION or SDL_EVENT_FINGER_DOWN or SDL_EVENT_FINGER_UP */
    Uint32 reserved;
    Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
    SDL_TouchID touchID; /**< The touch device id */
    SDL_FingerID fingerID;
    float x;            /**< Normalized in the range 0...1 */
    float y;            /**< Normalized in the range 0...1 */
    float dx;           /**< Normalized in the range -1...1 */
    float dy;           /**< Normalized in the range -1...1 */
    float pressure;     /**< Normalized in the range 0...1 */
    SDL_WindowID windowID; /**< The window underneath the finger, if any */
} SDL_TouchFingerEvent;

Remarks

Coordinates in this event are normalized. x and y are normalized to a range between 0.0f and 1.0f, relative to the window, so (0,0) is the top left and (1,1) is the bottom right. Delta coordinates dx and dy are normalized in the ranges of -1.0f (traversed all the way from the bottom or right to all the way up or left) to 1.0f (traversed all the way from the top or left to all the way down or right).

Note that while the coordinates are normalized, they are not clamped, which means in some circumstances you can get a value outside of this range. For example, a renderer using logical presentation might give a negative value when the touch is in the letterboxing. Some platforms might report a touch outside of the window, which will also be outside of the range.

Version

This struct is available since SDL 3.1.3.

CategoryAPI, CategoryAPIStruct, CategoryEvents

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