📄 sdljoystickgetball.html

📁 VC5.6.7的一个扩展库。跟DirectX的功能差不多。
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<HTML><HEAD><TITLE>SDL_JoystickGetBall</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Joystick"HREF="joystick.html"><LINKREL="PREVIOUS"TITLE="SDL_JoystickGetButton"HREF="sdljoystickgetbutton.html"><LINKREL="NEXT"TITLE="SDL_JoystickClose"HREF="sdljoystickclose.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdljoystickgetbutton.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdljoystickclose.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLJOYSTICKGETBALL"></A>SDL_JoystickGetBall</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN6433"></A><H2>Name</H2>SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN6436"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN6437"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">int <BCLASS="FSFUNC">SDL_JoystickGetBall</B></CODE>(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6443"></A><H2>Description</H2><P>Get the <TTCLASS="PARAMETER"><I>ball</I></TT> axis change.</P><P>Trackballs can only return relative motion since the last call to <TTCLASS="FUNCTION">SDL_JoystickGetBall</TT>, these motion deltas a placed into <TTCLASS="PARAMETER"><I>dx</I></TT> and <TTCLASS="PARAMETER"><I>dy</I></TT>.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6451"></A><H2>Return Value</H2><P>Returns <SPANCLASS="RETURNVALUE">0</SPAN> on success or <SPANCLASS="RETURNVALUE">-1</SPAN> on failure</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6456"></A><H2>Examples</H2><P><PRECLASS="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><DIVCLASS="REFSECT1"><ANAME="AEN6460"></A><H2>See Also</H2><P><AHREF="sdljoysticknumballs.html"><TTCLASS="FUNCTION">SDL_JoystickNumBalls</TT></A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdljoystickgetbutton.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdljoystickclose.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_JoystickGetButton</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="joystick.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_JoystickClose</TD></TR></TABLE></DIV></BODY></HTML>
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