📄 sdljoystickgetaxis.html
字号:
<HTML><HEAD><TITLE>SDL_JoystickGetAxis</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_JoystickUpdate"HREF="sdljoystickupdate.html"><LINKREL="NEXT"TITLE="SDL_JoystickGetHat"HREF="sdljoystickgethat.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="sdljoystickupdate.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdljoystickgethat.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLJOYSTICKGETAXIS"></A>SDL_JoystickGetAxis</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN6320"></A><H2>Name</H2>SDL_JoystickGetAxis -- Get the current state of an axis</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN6323"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN6324"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">Sint16 <BCLASS="FSFUNC">SDL_JoystickGetAxis</B></CODE>(SDL_Joystick *joystick, int axis);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6330"></A><H2>Description</H2><P><TTCLASS="FUNCTION">SDL_JoystickGetAxis</TT> returns the current state of the given <TTCLASS="PARAMETER"><I>axis</I></TT> on the given <TTCLASS="PARAMETER"><I>joystick</I></TT>.</P><P>On most modern joysticks the X axis is usually represented by <TTCLASS="PARAMETER"><I>axis</I></TT> 0 and the Y axis by <TTCLASS="PARAMETER"><I>axis</I></TT> 1. The value returned by <TTCLASS="FUNCTION">SDL_JoystickGetAxis</TT> is a signed integer (-32768 to 32768) representing the current position of the <TTCLASS="PARAMETER"><I>axis</I></TT>, it maybe necessary to impose certain tolerances on these values to account for jitter. It is worth noting that some joysticks use axes 2 and 3 for extra buttons.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6341"></A><H2>Return Value</H2><P>Returns a 16-bit signed integer representing the current position of the <TTCLASS="PARAMETER"><I>axis</I></TT>.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6345"></A><H2>Examples</H2><P><PRECLASS="PROGRAMLISTING">Sint16 x_move, y_move;SDL_Joystick *joy1;..x_move=SDL_JoystickGetAxis(joy1, 0);y_move=SDL_JoystickGetAxis(joy1, 1);</PRE></P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN6349"></A><H2>See Also</H2><P><AHREF="sdljoysticknumaxes.html"><TTCLASS="FUNCTION">SDL_JoystickNumAxes</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="sdljoystickupdate.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="sdljoystickgethat.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_JoystickUpdate</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="joystick.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_JoystickGetHat</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -