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SDL-1.2.2
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sdljoyballevent.html
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<
HTML
><
HEAD
><
TITLE
>SDL_JoyBallEvent<
/
TITLE
><
META
NAME
=
"GENERATOR"
CONTENT
=
"Modular DocBook HTML Stylesheet Version 1.64
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"HOME"
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"SDL Library Documentation"
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TITLE
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"SDL_JoyHatEvent"
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>SDL Library Documentation<
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H1
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A
NAME
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"SDLJOYBALLEVENT"
>SDL_JoyBallEvent<
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><
/
H1
><
DIV
CLASS
=
"REFNAMEDIV"
><
A
NAME
=
"AEN3963"
><
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><
H2
>Name<
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H2
>SDL_JoyBallEvent -- Joystick trackball motion event structure<
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DIV
><
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CLASS
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"REFSECT1"
><
A
NAME
=
"AEN3966"
><
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><
H2
>Structure Definition<
/
H2
><
PRE
CLASS
=
"PROGRAMLISTING"
>typedef struct
{
Uint8
type
;
Uint8 which;
Uint8 ball;
Sint16 xrel, yrel;
}
SDL_JoyBallEvent;<
/
PRE
><
/
DIV
><
DIV
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"REFSECT1"
><
A
NAME
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"AEN3969"
><
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H2
>Structure Data<
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"INFORMALTABLE"
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>type<
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><
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TT
><
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TD
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"LEFT"
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><
TT
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>SDL_JOYBALLMOTION<
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TT
><
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><
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><
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><
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ALIGN
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"LEFT"
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"TOP"
><
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"STRUCTFIELD"
><
I
>which<
/
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><
/
TT
><
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><
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"LEFT"
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>Joystick device index<
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TD
><
/
TR
><
TR
><
TD
ALIGN
=
"LEFT"
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=
"TOP"
><
TT
CLASS
=
"STRUCTFIELD"
><
I
>ball<
/
I
><
/
TT
><
/
TD
><
TD
ALIGN
=
"LEFT"
VALIGN
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"TOP"
>Joystick trackball index<
/
TD
><
/
TR
><
TR
><
TD
ALIGN
=
"LEFT"
VALIGN
=
"TOP"
><
TT
CLASS
=
"STRUCTFIELD"
><
I
>xrel<
/
I
><
/
TT
>, <
TT
CLASS
=
"STRUCTFIELD"
><
I
>yrel<
/
I
><
/
TT
><
/
TD
><
TD
ALIGN
=
"LEFT"
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"TOP"
>The relative motion in the X
/
Y direction<
/
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><
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><
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TBODY
><
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TABLE
><
P
><
/
P
><
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DIV
><
DIV
CLASS
=
"REFSECT1"
><
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NAME
=
"AEN3992"
><
/
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
><
DIV
CLASS
=
"REFSECT1"
><
A
NAME
=
"AEN4006"
><
/
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
><
/
DIV
><
DIV
CLASS
=
"NAVFOOTER"
><
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><
TR
><
TD
WIDTH
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"33%"
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"left"
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"top"
><
A
HREF
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"sdljoyhatevent.html"
>Prev<
/
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><
/
TD
><
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WIDTH
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><
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>Home<
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HREF
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>Next<
/
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><
/
TD
><
/
TR
><
TR
><
TD
WIDTH
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"33%"
ALIGN
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"left"
VALIGN
=
"top"
>SDL_JoyHatEvent<
/
TD
><
TD
WIDTH
=
"34%"
ALIGN
=
"center"
VALIGN
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"top"
><
A
HREF
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"eventstructures.html"
>Up<
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><
/
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WIDTH
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>