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diff docs/html/sdljoystickgetball.html @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children 55f1f1b3e27d
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+++ b/docs/html/sdljoystickgetball.html	Thu Apr 26 16:45:43 2001 +0000
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+<HTML
+><HEAD
+><TITLE
+>SDL_JoystickGetBall</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.61
+"><LINK
+REL="HOME"
+TITLE="SDL Library Documentation"
+HREF="index.html"><LINK
+REL="UP"
+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
+CLASS="REFENTRY"
+BGCOLOR="#FFF8DC"
+TEXT="#000000"
+LINK="#0000ee"
+VLINK="#551a8b"
+ALINK="#ff0000"
+><DIV
+CLASS="NAVHEADER"
+><TABLE
+WIDTH="100%"
+BORDER="0"
+CELLPADDING="0"
+CELLSPACING="0"
+><TR
+><TH
+COLSPAN="3"
+ALIGN="center"
+>SDL Library Documentation</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="sdljoystickgetbutton.html"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+></TD
+><TD
+WIDTH="10%"
+ALIGN="right"
+VALIGN="bottom"
+><A
+HREF="sdljoystickclose.html"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><H1
+><A
+NAME="SDLJOYSTICKGETBALL"
+>SDL_JoystickGetBall</A
+></H1
+><DIV
+CLASS="REFNAMEDIV"
+><A
+NAME="AEN5811"
+></A
+><H2
+>Name</H2
+>SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
+><DIV
+CLASS="REFSYNOPSISDIV"
+><A
+NAME="AEN5814"
+></A
+><H2
+>Synopsis</H2
+><DIV
+CLASS="FUNCSYNOPSIS"
+><A
+NAME="AEN5815"
+></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="AEN5821"
+></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="AEN5829"
+></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="AEN5834"
+></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="AEN5838"
+></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
+WIDTH="100%"
+BORDER="0"
+CELLPADDING="0"
+CELLSPACING="0"
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+><A
+HREF="sdljoystickgetbutton.html"
+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="index.html"
+>Home</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+><A
+HREF="sdljoystickclose.html"
+>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"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>SDL_JoystickClose</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
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