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annotate docs/html/sdljoystickgetaxis.html @ 2173:26233707bc94
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 11 Jul 2007 14:51:49 +0000 |
parents | 355632dca928 |
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rev | line source |
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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 1.76b+ |
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 | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="sdljoystickupdate.html" | |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdljoystickgethat.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLJOYSTICKGETAXIS" | |
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74 ></A |
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75 >SDL_JoystickGetAxis</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN6320" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_JoystickGetAxis -- Get the current state of an axis</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN6323" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN6324" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h"</PRE | |
101 ><P | |
102 ><CODE | |
103 ><CODE | |
104 CLASS="FUNCDEF" | |
105 >Sint16 <B | |
106 CLASS="FSFUNC" | |
107 >SDL_JoystickGetAxis</B | |
108 ></CODE | |
109 >(SDL_Joystick *joystick, int axis);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN6330" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 ><TT | |
124 CLASS="FUNCTION" | |
125 >SDL_JoystickGetAxis</TT | |
126 > returns the current state of the given <TT | |
127 CLASS="PARAMETER" | |
128 ><I | |
129 >axis</I | |
130 ></TT | |
131 > on the given <TT | |
132 CLASS="PARAMETER" | |
133 ><I | |
134 >joystick</I | |
135 ></TT | |
136 >.</P | |
137 ><P | |
138 >On most modern joysticks the X axis is usually represented by <TT | |
139 CLASS="PARAMETER" | |
140 ><I | |
141 >axis</I | |
142 ></TT | |
143 > 0 and the Y axis by <TT | |
144 CLASS="PARAMETER" | |
145 ><I | |
146 >axis</I | |
147 ></TT | |
148 > 1. The value returned by <TT | |
149 CLASS="FUNCTION" | |
150 >SDL_JoystickGetAxis</TT | |
151 > is a signed integer (-32768 to 32768) representing the current position of the <TT | |
152 CLASS="PARAMETER" | |
153 ><I | |
154 >axis</I | |
155 ></TT | |
156 >, 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 | |
157 ></DIV | |
158 ><DIV | |
159 CLASS="REFSECT1" | |
160 ><A | |
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161 NAME="AEN6341" |
0 | 162 ></A |
163 ><H2 | |
164 >Return Value</H2 | |
165 ><P | |
166 >Returns a 16-bit signed integer representing the current position of the <TT | |
167 CLASS="PARAMETER" | |
168 ><I | |
169 >axis</I | |
170 ></TT | |
171 >.</P | |
172 ></DIV | |
173 ><DIV | |
174 CLASS="REFSECT1" | |
175 ><A | |
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176 NAME="AEN6345" |
0 | 177 ></A |
178 ><H2 | |
179 >Examples</H2 | |
180 ><P | |
181 ><PRE | |
182 CLASS="PROGRAMLISTING" | |
183 >Sint16 x_move, y_move; | |
184 SDL_Joystick *joy1; | |
185 . | |
186 . | |
187 x_move=SDL_JoystickGetAxis(joy1, 0); | |
188 y_move=SDL_JoystickGetAxis(joy1, 1);</PRE | |
189 ></P | |
190 ></DIV | |
191 ><DIV | |
192 CLASS="REFSECT1" | |
193 ><A | |
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194 NAME="AEN6349" |
0 | 195 ></A |
196 ><H2 | |
197 >See Also</H2 | |
198 ><P | |
199 ><A | |
200 HREF="sdljoysticknumaxes.html" | |
201 ><TT | |
202 CLASS="FUNCTION" | |
203 >SDL_JoystickNumAxes</TT | |
204 ></A | |
205 ></P | |
206 ></DIV | |
207 ><DIV | |
208 CLASS="NAVFOOTER" | |
209 ><HR | |
210 ALIGN="LEFT" | |
211 WIDTH="100%"><TABLE | |
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212 SUMMARY="Footer navigation table" |
0 | 213 WIDTH="100%" |
214 BORDER="0" | |
215 CELLPADDING="0" | |
216 CELLSPACING="0" | |
217 ><TR | |
218 ><TD | |
219 WIDTH="33%" | |
220 ALIGN="left" | |
221 VALIGN="top" | |
222 ><A | |
223 HREF="sdljoystickupdate.html" | |
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224 ACCESSKEY="P" |
0 | 225 >Prev</A |
226 ></TD | |
227 ><TD | |
228 WIDTH="34%" | |
229 ALIGN="center" | |
230 VALIGN="top" | |
231 ><A | |
232 HREF="index.html" | |
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233 ACCESSKEY="H" |
0 | 234 >Home</A |
235 ></TD | |
236 ><TD | |
237 WIDTH="33%" | |
238 ALIGN="right" | |
239 VALIGN="top" | |
240 ><A | |
241 HREF="sdljoystickgethat.html" | |
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242 ACCESSKEY="N" |
0 | 243 >Next</A |
244 ></TD | |
245 ></TR | |
246 ><TR | |
247 ><TD | |
248 WIDTH="33%" | |
249 ALIGN="left" | |
250 VALIGN="top" | |
251 >SDL_JoystickUpdate</TD | |
252 ><TD | |
253 WIDTH="34%" | |
254 ALIGN="center" | |
255 VALIGN="top" | |
256 ><A | |
257 HREF="joystick.html" | |
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258 ACCESSKEY="U" |
0 | 259 >Up</A |
260 ></TD | |
261 ><TD | |
262 WIDTH="33%" | |
263 ALIGN="right" | |
264 VALIGN="top" | |
265 >SDL_JoystickGetHat</TD | |
266 ></TR | |
267 ></TABLE | |
268 ></DIV | |
269 ></BODY | |
270 ></HTML | |
271 > |