Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetaxis.html @ 622:e6d751de784a
Attempt #3: Fixed boolean logic bug that caused all HID joysticks to be
rejected on MacOSX/Darwin. Works now. No, really this time. --ryan.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 22 May 2003 20:42:37 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_JoystickGetAxis</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_JoystickUpdate" | |
| 17 HREF="sdljoystickupdate.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_JoystickGetHat" | |
| 20 HREF="sdljoystickgethat.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="sdljoystickupdate.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="sdljoystickgethat.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="SDLJOYSTICKGETAXIS" | |
| 71 >SDL_JoystickGetAxis</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN5932" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_JoystickGetAxis -- Get the current state of an axis</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN5935" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN5936" |
| 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 >Sint16 <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_JoystickGetAxis</B | |
| 105 ></CODE | |
| 106 >(SDL_Joystick *joystick, int axis);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN5942" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 ><TT | |
| 121 CLASS="FUNCTION" | |
| 122 >SDL_JoystickGetAxis</TT | |
| 123 > returns the current state of the given <TT | |
| 124 CLASS="PARAMETER" | |
| 125 ><I | |
| 126 >axis</I | |
| 127 ></TT | |
| 128 > on the given <TT | |
| 129 CLASS="PARAMETER" | |
| 130 ><I | |
| 131 >joystick</I | |
| 132 ></TT | |
| 133 >.</P | |
| 134 ><P | |
| 135 >On most modern joysticks the X axis is usually represented by <TT | |
| 136 CLASS="PARAMETER" | |
| 137 ><I | |
| 138 >axis</I | |
| 139 ></TT | |
| 140 > 0 and the Y axis by <TT | |
| 141 CLASS="PARAMETER" | |
| 142 ><I | |
| 143 >axis</I | |
| 144 ></TT | |
| 145 > 1. The value returned by <TT | |
| 146 CLASS="FUNCTION" | |
| 147 >SDL_JoystickGetAxis</TT | |
| 148 > is a signed integer (-32768 to 32768) representing the current position of the <TT | |
| 149 CLASS="PARAMETER" | |
| 150 ><I | |
| 151 >axis</I | |
| 152 ></TT | |
| 153 >, 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 | |
| 154 ></DIV | |
| 155 ><DIV | |
| 156 CLASS="REFSECT1" | |
| 157 ><A | |
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158 NAME="AEN5953" |
| 0 | 159 ></A |
| 160 ><H2 | |
| 161 >Return Value</H2 | |
| 162 ><P | |
| 163 >Returns a 16-bit signed integer representing the current position of the <TT | |
| 164 CLASS="PARAMETER" | |
| 165 ><I | |
| 166 >axis</I | |
| 167 ></TT | |
| 168 >.</P | |
| 169 ></DIV | |
| 170 ><DIV | |
| 171 CLASS="REFSECT1" | |
| 172 ><A | |
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173 NAME="AEN5957" |
| 0 | 174 ></A |
| 175 ><H2 | |
| 176 >Examples</H2 | |
| 177 ><P | |
| 178 ><PRE | |
| 179 CLASS="PROGRAMLISTING" | |
| 180 >Sint16 x_move, y_move; | |
| 181 SDL_Joystick *joy1; | |
| 182 . | |
| 183 . | |
| 184 x_move=SDL_JoystickGetAxis(joy1, 0); | |
| 185 y_move=SDL_JoystickGetAxis(joy1, 1);</PRE | |
| 186 ></P | |
| 187 ></DIV | |
| 188 ><DIV | |
| 189 CLASS="REFSECT1" | |
| 190 ><A | |
|
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191 NAME="AEN5961" |
| 0 | 192 ></A |
| 193 ><H2 | |
| 194 >See Also</H2 | |
| 195 ><P | |
| 196 ><A | |
| 197 HREF="sdljoysticknumaxes.html" | |
| 198 ><TT | |
| 199 CLASS="FUNCTION" | |
| 200 >SDL_JoystickNumAxes</TT | |
| 201 ></A | |
| 202 ></P | |
| 203 ></DIV | |
| 204 ><DIV | |
| 205 CLASS="NAVFOOTER" | |
| 206 ><HR | |
| 207 ALIGN="LEFT" | |
| 208 WIDTH="100%"><TABLE | |
| 209 WIDTH="100%" | |
| 210 BORDER="0" | |
| 211 CELLPADDING="0" | |
| 212 CELLSPACING="0" | |
| 213 ><TR | |
| 214 ><TD | |
| 215 WIDTH="33%" | |
| 216 ALIGN="left" | |
| 217 VALIGN="top" | |
| 218 ><A | |
| 219 HREF="sdljoystickupdate.html" | |
| 220 >Prev</A | |
| 221 ></TD | |
| 222 ><TD | |
| 223 WIDTH="34%" | |
| 224 ALIGN="center" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="index.html" | |
| 228 >Home</A | |
| 229 ></TD | |
| 230 ><TD | |
| 231 WIDTH="33%" | |
| 232 ALIGN="right" | |
| 233 VALIGN="top" | |
| 234 ><A | |
| 235 HREF="sdljoystickgethat.html" | |
| 236 >Next</A | |
| 237 ></TD | |
| 238 ></TR | |
| 239 ><TR | |
| 240 ><TD | |
| 241 WIDTH="33%" | |
| 242 ALIGN="left" | |
| 243 VALIGN="top" | |
| 244 >SDL_JoystickUpdate</TD | |
| 245 ><TD | |
| 246 WIDTH="34%" | |
| 247 ALIGN="center" | |
| 248 VALIGN="top" | |
| 249 ><A | |
| 250 HREF="joystick.html" | |
| 251 >Up</A | |
| 252 ></TD | |
| 253 ><TD | |
| 254 WIDTH="33%" | |
| 255 ALIGN="right" | |
| 256 VALIGN="top" | |
| 257 >SDL_JoystickGetHat</TD | |
| 258 ></TR | |
| 259 ></TABLE | |
| 260 ></DIV | |
| 261 ></BODY | |
| 262 ></HTML | |
| 263 > |