SDL_JoyBallEvent — Joystick trackball motion event structure
| typedef | struct { | |||
| Uint8 |
type; |
|||
| Uint8 |
which; |
|||
| Uint8 |
ball; |
|||
| Sint16 |
xrel, |
|||
yrel; |
||||
| } SDL_JoyBallEvent; | ||||
typeSDL_JOYBALLMOTION
whichJoystick device index
ballJoystick trackball index
xrel, yrelThe 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(3), Joystick Functions, SDL_JoystickEventState(3), SDL_JoystickGetBall(3)
| COPYRIGHT |
|---|
|
This manual page is taken from the SDL library, licensed under GNU LGPL. |