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>SDL_JoyBallEvent< /TITLE
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>SDL Library Documentation< /TH
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>< A
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>SDL_JoyBallEvent< /H1
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>< DIV
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>< A
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>< /A
>< H2
>Name< /H2
>SDL_JoyBallEvent -- Joystick trackball motion event structure< /DIV
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>< A
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NAME="AEN4399"
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>< /A
>< H2
>Structure Definition< /H2
>< PRE
CLASS="PROGRAMLISTING"
>typedef struct{
Uint8 type;
Uint8 which;
Uint8 ball;
Sint16 xrel, yrel;
} SDL_JoyBallEvent;< /PRE
>< /DIV
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>< A
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>< H2
>Structure Data< /H2
>< DIV
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>< TT
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>< I
>type< /I
>< /TT
>< /TD
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>< TT
CLASS="LITERAL"
>SDL_JOYBALLMOTION< /TT
>< /TD
>< /TR
>< TR
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>< TT
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>< I
>which< /I
>< /TT
>< /TD
>< TD
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>Joystick device index< /TD
>< /TR
>< TR
>< TD
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>< TT
CLASS="STRUCTFIELD"
>< I
>ball< /I
>< /TT
>< /TD
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>Joystick trackball index< /TD
>< /TR
>< TR
>< TD
ALIGN="LEFT"
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>< TT
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>< I
>xrel< /I
>< /TT
>, < TT
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>< I
>yrel< /I
>< /TT
>< /TD
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>The relative motion in the X/Y direction< /TD
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>< P
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>< A
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NAME="AEN4425"
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>< /A
>< H2
>Description< /H2
>< P
>< SPAN
CLASS="STRUCTNAME"
>SDL_JoyBallEvent< /SPAN
> is a member of the < A
HREF="sdlevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
>< /A
> union and is used when an event of type < TT
CLASS="LITERAL"
>SDL_JOYBALLMOTION< /TT
> is reported.< /P
>< P
>A < TT
CLASS="LITERAL"
>SDL_JOYBALLMOTION< /TT
> event occurs when a user moves a trackball on the joystick. The field < TT
CLASS="STRUCTFIELD"
>< I
>which< /I
>< /TT
> is the index of the joystick that reported the event and < TT
CLASS="STRUCTFIELD"
>< I
>ball< /I
>< /TT
> is the index of the trackball (for a more detailed explaination see the < A
HREF="joystick.html"
>Joystick section< /A
>). 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 < TT
CLASS="STRUCTFIELD"
>< I
>xrel< /I
>< /TT
> and < TT
CLASS="STRUCTFIELD"
>< I
>yrel< /I
>< /TT
>.< /P
>< /DIV
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>< A
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>< /A
>< H2
>See Also< /H2
>< P
>< A
HREF="sdlevent.html"
>< SPAN
CLASS="STRUCTNAME"
>SDL_Event< /SPAN
>< /A
>,
< A
HREF="joystick.html"
>Joystick Functions< /A
>,
< A
HREF="sdljoystickeventstate.html"
>< TT
CLASS="FUNCTION"
>SDL_JoystickEventState< /TT
>< /A
>,
< A
HREF="sdljoystickgetball.html"
>< TT
CLASS="FUNCTION"
>SDL_JoystickGetBall< /TT
>< /A
>< /P
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