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+<HTML
+><HEAD
+><TITLE
+>SDL_JoystickGetBall</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
+"><LINK
+REL="HOME"
+TITLE="SDL Library Documentation"
+HREF="index.html"><LINK
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+TITLE="Joystick"
+HREF="joystick.html"><LINK
+REL="PREVIOUS"
+TITLE="SDL_JoystickGetButton"
+HREF="sdljoystickgetbutton.html"><LINK
+REL="NEXT"
+TITLE="SDL_JoystickClose"
+HREF="sdljoystickclose.html"></HEAD
+><BODY
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+>SDL Library Documentation</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
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+><A
+HREF="sdljoystickgetbutton.html"
+ACCESSKEY="P"
+>Prev</A
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+><A
+HREF="sdljoystickclose.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><H1
+><A
+NAME="SDLJOYSTICKGETBALL"
+></A
+>SDL_JoystickGetBall</H1
+><DIV
+CLASS="REFNAMEDIV"
+><A
+NAME="AEN6433"
+></A
+><H2
+>Name</H2
+>SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
+><DIV
+CLASS="REFSYNOPSISDIV"
+><A
+NAME="AEN6436"
+></A
+><H2
+>Synopsis</H2
+><DIV
+CLASS="FUNCSYNOPSIS"
+><A
+NAME="AEN6437"
+></A
+><P
+></P
+><PRE
+CLASS="FUNCSYNOPSISINFO"
+>#include "SDL.h"</PRE
+><P
+><CODE
+><CODE
+CLASS="FUNCDEF"
+>int <B
+CLASS="FSFUNC"
+>SDL_JoystickGetBall</B
+></CODE
+>(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE
+></P
+><P
+></P
+></DIV
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN6443"
+></A
+><H2
+>Description</H2
+><P
+>Get the <TT
+CLASS="PARAMETER"
+><I
+>ball</I
+></TT
+> axis change.</P
+><P
+>Trackballs can only return relative motion since the last call to <TT
+CLASS="FUNCTION"
+>SDL_JoystickGetBall</TT
+>, these motion deltas a placed into <TT
+CLASS="PARAMETER"
+><I
+>dx</I
+></TT
+> and <TT
+CLASS="PARAMETER"
+><I
+>dy</I
+></TT
+>.</P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN6451"
+></A
+><H2
+>Return Value</H2
+><P
+>Returns <SPAN
+CLASS="RETURNVALUE"
+>0</SPAN
+> on success or <SPAN
+CLASS="RETURNVALUE"
+>-1</SPAN
+> on failure</P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN6456"
+></A
+><H2
+>Examples</H2
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>int delta_x, delta_y;
+SDL_Joystick *joy;
+.
+.
+.
+SDL_JoystickUpdate();
+if(SDL_JoystickGetBall(joy, 0, &#38;delta_x, &#38;delta_y)==-1)
+  printf("TrackBall Read Error!\n");
+printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</PRE
+></P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN6460"
+></A
+><H2
+>See Also</H2
+><P
+><A
+HREF="sdljoysticknumballs.html"
+><TT
+CLASS="FUNCTION"
+>SDL_JoystickNumBalls</TT
+></A
+></P
+></DIV
+><DIV
+CLASS="NAVFOOTER"
+><HR
+ALIGN="LEFT"
+WIDTH="100%"><TABLE
+SUMMARY="Footer navigation table"
+WIDTH="100%"
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+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+><A
+HREF="sdljoystickgetbutton.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="index.html"
+ACCESSKEY="H"
+>Home</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+><A
+HREF="sdljoystickclose.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>SDL_JoystickGetButton</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="joystick.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>SDL_JoystickClose</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
+\ No newline at end of file