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340 lines
4.4 KiB
340 lines
4.4 KiB
<HTML |
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><HEAD |
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>SDL_JoyBallEvent</TITLE |
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
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TITLE="SDL Event Structures." |
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TITLE="SDL_JoyHatEvent" |
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TITLE="SDL_ResizeEvent" |
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>SDL Library Documentation</TH |
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><TD |
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WIDTH="10%" |
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VALIGN="bottom" |
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><A |
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HREF="sdljoyhatevent.html" |
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>Prev</A |
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WIDTH="100%"></DIV |
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><H1 |
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><A |
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NAME="SDLJOYBALLEVENT" |
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></A |
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>SDL_JoyBallEvent</H1 |
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><DIV |
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CLASS="REFNAMEDIV" |
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><A |
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NAME="AEN4396" |
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></A |
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><H2 |
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>Name</H2 |
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>SDL_JoyBallEvent -- Joystick trackball motion event structure</DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN4399" |
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></A |
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><H2 |
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>Structure Definition</H2 |
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><PRE |
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CLASS="PROGRAMLISTING" |
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>typedef struct{ |
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Uint8 type; |
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Uint8 which; |
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Uint8 ball; |
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Sint16 xrel, yrel; |
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} SDL_JoyBallEvent;</PRE |
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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN4402" |
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></A |
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><H2 |
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>Structure Data</H2 |
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><DIV |
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CLASS="INFORMALTABLE" |
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><A |
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NAME="AEN4404" |
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></A |
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><P |
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></P |
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><TBODY |
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><TR |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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><TT |
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CLASS="STRUCTFIELD" |
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><I |
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>type</I |
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></TT |
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></TD |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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><TT |
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CLASS="LITERAL" |
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>SDL_JOYBALLMOTION</TT |
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></TD |
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></TR |
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><TR |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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><TT |
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CLASS="STRUCTFIELD" |
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><I |
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>which</I |
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></TT |
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></TD |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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>Joystick device index</TD |
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></TR |
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><TR |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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><TT |
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CLASS="STRUCTFIELD" |
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><I |
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>ball</I |
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></TT |
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></TD |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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>Joystick trackball index</TD |
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></TR |
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><TR |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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><TT |
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CLASS="STRUCTFIELD" |
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><I |
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>xrel</I |
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></TT |
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>, <TT |
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CLASS="STRUCTFIELD" |
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><I |
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>yrel</I |
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></TT |
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></TD |
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><TD |
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ALIGN="LEFT" |
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VALIGN="TOP" |
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>The relative motion in the X/Y direction</TD |
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></TR |
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></TBODY |
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></TABLE |
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><P |
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></P |
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></DIV |
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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN4425" |
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></A |
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><H2 |
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>Description</H2 |
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><P |
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><SPAN |
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CLASS="STRUCTNAME" |
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>SDL_JoyBallEvent</SPAN |
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> is a member of the <A |
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HREF="sdlevent.html" |
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><SPAN |
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CLASS="STRUCTNAME" |
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>SDL_Event</SPAN |
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></A |
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> union and is used when an event of type <TT |
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CLASS="LITERAL" |
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>SDL_JOYBALLMOTION</TT |
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> is reported.</P |
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><P |
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>A <TT |
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CLASS="LITERAL" |
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>SDL_JOYBALLMOTION</TT |
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> event occurs when a user moves a trackball on the joystick. The field <TT |
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CLASS="STRUCTFIELD" |
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><I |
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>which</I |
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></TT |
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> is the index of the joystick that reported the event and <TT |
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CLASS="STRUCTFIELD" |
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><I |
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>ball</I |
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></TT |
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> is the index of the trackball (for a more detailed explaination see the <A |
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HREF="joystick.html" |
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>Joystick section</A |
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>). 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 |
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CLASS="STRUCTFIELD" |
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><I |
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>xrel</I |
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></TT |
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> and <TT |
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CLASS="STRUCTFIELD" |
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><I |
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>yrel</I |
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></TT |
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>.</P |
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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN4439" |
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></A |
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><H2 |
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>See Also</H2 |
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><P |
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><A |
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HREF="sdlevent.html" |
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><SPAN |
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CLASS="STRUCTNAME" |
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>SDL_Event</SPAN |
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></A |
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>, |
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<A |
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HREF="joystick.html" |
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>Joystick Functions</A |
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>, |
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<A |
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HREF="sdljoystickeventstate.html" |
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><TT |
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CLASS="FUNCTION" |
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>SDL_JoystickEventState</TT |
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></A |
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>, |
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<A |
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HREF="sdljoystickgetball.html" |
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><TT |
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CLASS="FUNCTION" |
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>SDL_JoystickGetBall</TT |
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></A |
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></P |
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CLASS="NAVFOOTER" |
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>Prev</A |
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>Home</A |
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>Next</A |
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></TD |
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><TR |
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><TD |
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WIDTH="33%" |
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ALIGN="left" |
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VALIGN="top" |
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>SDL_JoyHatEvent</TD |
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WIDTH="34%" |
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ALIGN="center" |
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>Up</A |
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> |