forked from KolibriOS/kolibrios
254 lines
3.2 KiB
HTML
254 lines
3.2 KiB
HTML
<HTML
|
|
><HEAD
|
|
><TITLE
|
|
>SDL_JoystickGetBall</TITLE
|
|
><META
|
|
NAME="GENERATOR"
|
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
|
|
"><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="AEN5886"
|
|
></A
|
|
><H2
|
|
>Name</H2
|
|
>SDL_JoystickGetBall -- Get relative trackball motion</DIV
|
|
><DIV
|
|
CLASS="REFSYNOPSISDIV"
|
|
><A
|
|
NAME="AEN5889"
|
|
></A
|
|
><H2
|
|
>Synopsis</H2
|
|
><DIV
|
|
CLASS="FUNCSYNOPSIS"
|
|
><A
|
|
NAME="AEN5890"
|
|
></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="AEN5896"
|
|
></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="AEN5904"
|
|
></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="AEN5909"
|
|
></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="AEN5913"
|
|
></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
|
|
> |