SDL_!JoyBallEvent?
NAME STRUCTURE DEFINITION STRUCTURE DATA DESCRIPTION SEE ALSO
SDL_!JoyBallEvent?- Joystick trackball motion event structure
typedef struct{ Uint8 type; Uint8 which; Uint8 ball; Sint16 xrel, yrel; } SDL_!JoyBallEvent?;
type SDL_JOYBALLMOTION
which Joystick device index
ball Joystick trackball index
xrel, yrel The relative motion in the X/Y direction
SDL_!JoyBallEvent? is a member of the SDL_Event union and is used when an event of type SDL_JOYBALLMOTION is reported.
A SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick. The field which is the index of the joystick that reported the event and ball is the index of the trackball (for a more detailed explaination see the Joystick section). Trackballs only return relative motion, this is the change in position on the ball since it was last polled (last cycle of the event loop) and it is stored in xrel and yrel.
SDL_Event, Joystick Functions, SDL_!JoystickEventState?, SDL_!JoystickGetBall?
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