Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetball.html @ 571:8e3ce997621c
Date: Thu, 16 Jan 2003 13:48:31 +0200
From: "Mike Gorchak"
Subject: All QNX patches
whole patches concerning QNX. Almost all code has been rewritten by Julian
and me. Added initial support for hw overlays in QNX and many many others
fixes.
P.S. This patches has been reviewed by Dave Rempel from QSSL and included in
SDL 1.2.5 distribution, which coming on 3rd party CD for newest 6.2.1
version of QNX, which will be available soon.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Jan 2003 01:38:37 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_JoystickGetBall</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Joystick" | |
| 14 HREF="joystick.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_JoystickGetButton" | |
| 17 HREF="sdljoystickgetbutton.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_JoystickClose" | |
| 20 HREF="sdljoystickclose.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdljoystickgetbutton.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdljoystickclose.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLJOYSTICKGETBALL" | |
| 71 >SDL_JoystickGetBall</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN6045" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_JoystickGetBall -- Get relative trackball motion</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN6048" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN6049" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h"</PRE | |
| 98 ><P | |
| 99 ><CODE | |
| 100 ><CODE | |
| 101 CLASS="FUNCDEF" | |
| 102 >int <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_JoystickGetBall</B | |
| 105 ></CODE | |
| 106 >(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
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115 NAME="AEN6055" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Get the <TT | |
| 121 CLASS="PARAMETER" | |
| 122 ><I | |
| 123 >ball</I | |
| 124 ></TT | |
| 125 > axis change.</P | |
| 126 ><P | |
| 127 >Trackballs can only return relative motion since the last call to <TT | |
| 128 CLASS="FUNCTION" | |
| 129 >SDL_JoystickGetBall</TT | |
| 130 >, these motion deltas a placed into <TT | |
| 131 CLASS="PARAMETER" | |
| 132 ><I | |
| 133 >dx</I | |
| 134 ></TT | |
| 135 > and <TT | |
| 136 CLASS="PARAMETER" | |
| 137 ><I | |
| 138 >dy</I | |
| 139 ></TT | |
| 140 >.</P | |
| 141 ></DIV | |
| 142 ><DIV | |
| 143 CLASS="REFSECT1" | |
| 144 ><A | |
|
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145 NAME="AEN6063" |
| 0 | 146 ></A |
| 147 ><H2 | |
| 148 >Return Value</H2 | |
| 149 ><P | |
| 150 >Returns <SPAN | |
| 151 CLASS="RETURNVALUE" | |
| 152 >0</SPAN | |
| 153 > on success or <SPAN | |
| 154 CLASS="RETURNVALUE" | |
| 155 >-1</SPAN | |
| 156 > on failure</P | |
| 157 ></DIV | |
| 158 ><DIV | |
| 159 CLASS="REFSECT1" | |
| 160 ><A | |
|
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161 NAME="AEN6068" |
| 0 | 162 ></A |
| 163 ><H2 | |
| 164 >Examples</H2 | |
| 165 ><P | |
| 166 ><PRE | |
| 167 CLASS="PROGRAMLISTING" | |
| 168 >int delta_x, delta_y; | |
| 169 SDL_Joystick *joy; | |
| 170 . | |
| 171 . | |
| 172 . | |
| 173 SDL_JoystickUpdate(); | |
| 174 if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1) | |
| 175 printf("TrackBall Read Error!\n"); | |
| 176 printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</PRE | |
| 177 ></P | |
| 178 ></DIV | |
| 179 ><DIV | |
| 180 CLASS="REFSECT1" | |
| 181 ><A | |
|
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182 NAME="AEN6072" |
| 0 | 183 ></A |
| 184 ><H2 | |
| 185 >See Also</H2 | |
| 186 ><P | |
| 187 ><A | |
| 188 HREF="sdljoysticknumballs.html" | |
| 189 ><TT | |
| 190 CLASS="FUNCTION" | |
| 191 >SDL_JoystickNumBalls</TT | |
| 192 ></A | |
| 193 ></P | |
| 194 ></DIV | |
| 195 ><DIV | |
| 196 CLASS="NAVFOOTER" | |
| 197 ><HR | |
| 198 ALIGN="LEFT" | |
| 199 WIDTH="100%"><TABLE | |
| 200 WIDTH="100%" | |
| 201 BORDER="0" | |
| 202 CELLPADDING="0" | |
| 203 CELLSPACING="0" | |
| 204 ><TR | |
| 205 ><TD | |
| 206 WIDTH="33%" | |
| 207 ALIGN="left" | |
| 208 VALIGN="top" | |
| 209 ><A | |
| 210 HREF="sdljoystickgetbutton.html" | |
| 211 >Prev</A | |
| 212 ></TD | |
| 213 ><TD | |
| 214 WIDTH="34%" | |
| 215 ALIGN="center" | |
| 216 VALIGN="top" | |
| 217 ><A | |
| 218 HREF="index.html" | |
| 219 >Home</A | |
| 220 ></TD | |
| 221 ><TD | |
| 222 WIDTH="33%" | |
| 223 ALIGN="right" | |
| 224 VALIGN="top" | |
| 225 ><A | |
| 226 HREF="sdljoystickclose.html" | |
| 227 >Next</A | |
| 228 ></TD | |
| 229 ></TR | |
| 230 ><TR | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="left" | |
| 234 VALIGN="top" | |
| 235 >SDL_JoystickGetButton</TD | |
| 236 ><TD | |
| 237 WIDTH="34%" | |
| 238 ALIGN="center" | |
| 239 VALIGN="top" | |
| 240 ><A | |
| 241 HREF="joystick.html" | |
| 242 >Up</A | |
| 243 ></TD | |
| 244 ><TD | |
| 245 WIDTH="33%" | |
| 246 ALIGN="right" | |
| 247 VALIGN="top" | |
| 248 >SDL_JoystickClose</TD | |
| 249 ></TR | |
| 250 ></TABLE | |
| 251 ></DIV | |
| 252 ></BODY | |
| 253 ></HTML | |
| 254 > |