Mercurial > sdl-ios-xcode
view docs/html/sdljoystickgetball.html @ 3261:72b542f34739
The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
The linux code appears to be complete and *should* be the base of all Unix and GCC based versions. The macosx and win32 versions
are currently just copies of the dummy code. I will begin working on the windows version as soon as this check in is done. I
need someone to work on the Mac OS X version.
I'm afraid that this check in will break QNX (Sorry!)
author | Bob Pendleton <bob@pendleton.com> |
---|---|
date | Thu, 17 Sep 2009 20:35:12 +0000 |
parents | 355632dca928 |
children |
line wrap: on
line source
<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 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 SUMMARY="Header navigation 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" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><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 -- 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, &delta_x, &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%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><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 >