263 lines
3.5 KiB
HTML
263 lines
3.5 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>SDL_JoystickGetAxis</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Joystick"
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HREF="joystick.html"><LINK
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REL="PREVIOUS"
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TITLE="SDL_JoystickUpdate"
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HREF="sdljoystickupdate.html"><LINK
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REL="NEXT"
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TITLE="SDL_JoystickGetHat"
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HREF="sdljoystickgethat.html"></HEAD
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><BODY
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CLASS="REFENTRY"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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WIDTH="100%"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sdljoystickupdate.html"
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>Prev</A
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="sdljoystickgethat.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="SDLJOYSTICKGETAXIS"
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>SDL_JoystickGetAxis</A
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN5773"
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></A
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><H2
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>Name</H2
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>SDL_JoystickGetAxis -- Get the current state of an axis</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN5776"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN5777"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>Sint16 <B
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CLASS="FSFUNC"
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>SDL_JoystickGetAxis</B
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></CODE
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>(SDL_Joystick *joystick, int axis);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN5783"
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></A
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><H2
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>Description</H2
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><P
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><TT
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CLASS="FUNCTION"
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>SDL_JoystickGetAxis</TT
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> returns the current state of the given <TT
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CLASS="PARAMETER"
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><I
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>axis</I
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></TT
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> on the given <TT
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CLASS="PARAMETER"
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><I
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>joystick</I
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></TT
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>.</P
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><P
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>On most modern joysticks the X axis is usually represented by <TT
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CLASS="PARAMETER"
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><I
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>axis</I
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></TT
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> 0 and the Y axis by <TT
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CLASS="PARAMETER"
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><I
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>axis</I
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></TT
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> 1. The value returned by <TT
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CLASS="FUNCTION"
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>SDL_JoystickGetAxis</TT
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> is a signed integer (-32768 to 32768) representing the current position of the <TT
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CLASS="PARAMETER"
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><I
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>axis</I
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></TT
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>, 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
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN5794"
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></A
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><H2
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>Return Value</H2
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><P
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>Returns a 16-bit signed integer representing the current position of the <TT
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CLASS="PARAMETER"
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><I
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>axis</I
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></TT
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>.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN5798"
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></A
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><H2
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>Examples</H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>Sint16 x_move, y_move;
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SDL_Joystick *joy1;
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.
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.
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x_move=SDL_JoystickGetAxis(joy1, 0);
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y_move=SDL_JoystickGetAxis(joy1, 1);</PRE
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></P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN5802"
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></A
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><H2
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>See Also</H2
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><P
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><A
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HREF="sdljoysticknumaxes.html"
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><TT
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CLASS="FUNCTION"
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>SDL_JoystickNumAxes</TT
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></A
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></P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="sdljoystickupdate.html"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="sdljoystickgethat.html"
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>Next</A
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></TD
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></TR
|
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><TR
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
|
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>SDL_JoystickUpdate</TD
|
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><TD
|
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WIDTH="34%"
|
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ALIGN="center"
|
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VALIGN="top"
|
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><A
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HREF="joystick.html"
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>Up</A
|
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></TD
|
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><TD
|
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WIDTH="33%"
|
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ALIGN="right"
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VALIGN="top"
|
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>SDL_JoystickGetHat</TD
|
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></TR
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></TABLE
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></DIV
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></BODY
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> |