View Source: SDL_JoyBallEvent(3) - Waikato Linux Users Group

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SDL_!JoyBallEvent
!!!SDL_!JoyBallEvent
NAME
STRUCTURE DEFINITION
STRUCTURE DATA
DESCRIPTION
SEE ALSO
----
!!NAME


SDL_!JoyBallEvent- Joystick trackball motion event structure
!!STRUCTURE DEFINITION


typedef struct{
Uint8 type;
Uint8 which;
Uint8 ball;
Sint16 xrel, yrel;
} SDL_!JoyBallEvent;
!!STRUCTURE DATA


__type SDL_JOYBALLMOTION__


__which__ Joystick device index


__ball__ Joystick trackball index


__xrel__, __yrel__ The relative motion in the X/Y
direction
!!DESCRIPTION


__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__.
!!SEE ALSO


__SDL_Event__, ''Joystick Functions'',
__SDL_!JoystickEventState__,
__SDL_!JoystickGetBall__
----

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Last edited on Monday, June 3, 2002 6:53:44 pm by "perry"

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