Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetaxis.html @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 28 Jun 2003 21:52:26 +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 > |