Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetball.html @ 309:2de77f7b7a28
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 11 Mar 2002 17:38:56 +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 > |