forked from KolibriOS/kolibrios
254 lines
3.2 KiB
HTML
254 lines
3.2 KiB
HTML
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<HTML
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><HEAD
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><TITLE
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>SDL_JoystickGetBall</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_JoystickGetButton"
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HREF="sdljoystickgetbutton.html"><LINK
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REL="NEXT"
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TITLE="SDL_JoystickClose"
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HREF="sdljoystickclose.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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BORDER="0"
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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="sdljoystickgetbutton.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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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="sdljoystickclose.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="SDLJOYSTICKGETBALL"
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>SDL_JoystickGetBall</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="AEN5886"
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></A
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><H2
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>Name</H2
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>SDL_JoystickGetBall -- Get relative trackball motion</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN5889"
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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="AEN5890"
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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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>int <B
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CLASS="FSFUNC"
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>SDL_JoystickGetBall</B
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></CODE
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>(SDL_Joystick *joystick, int ball, int *dx, int *dy);</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="AEN5896"
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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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>Get the <TT
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CLASS="PARAMETER"
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><I
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>ball</I
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></TT
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> axis change.</P
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><P
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>Trackballs can only return relative motion since the last call to <TT
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CLASS="FUNCTION"
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>SDL_JoystickGetBall</TT
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>, these motion deltas a placed into <TT
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CLASS="PARAMETER"
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><I
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>dx</I
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></TT
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> and <TT
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CLASS="PARAMETER"
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><I
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>dy</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="AEN5904"
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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 <SPAN
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CLASS="RETURNVALUE"
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>0</SPAN
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> on success or <SPAN
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CLASS="RETURNVALUE"
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>-1</SPAN
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> on failure</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="AEN5909"
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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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>int delta_x, delta_y;
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SDL_Joystick *joy;
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.
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.
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.
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SDL_JoystickUpdate();
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if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1)
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printf("TrackBall Read Error!\n");
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printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</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="AEN5913"
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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="sdljoysticknumballs.html"
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><TT
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CLASS="FUNCTION"
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>SDL_JoystickNumBalls</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="sdljoystickgetbutton.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="sdljoystickclose.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_JoystickGetButton</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_JoystickClose</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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></HTML
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>
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