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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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-1:000000000000 0:74212992fb08
1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_JoystickGetBall</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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
76 NAME="AEN5811"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN5814"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN5815"
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
115 NAME="AEN5821"
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
145 NAME="AEN5829"
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
161 NAME="AEN5834"
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, &#38;delta_x, &#38;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
182 NAME="AEN5838"
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 >