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70 | WIDTH="100%"></DIV |
71 | ><H1 |
72 | ><A |
73 | NAME="SDLJOYBALLEVENT" |
74 | ></A |
75 | >SDL_JoyBallEvent</H1 |
76 | ><DIV |
77 | CLASS="REFNAMEDIV" |
78 | ><A |
79 | NAME="AEN4396" |
80 | ></A |
81 | ><H2 |
82 | >Name</H2 |
83 | >SDL_JoyBallEvent -- Joystick trackball motion event structure</DIV |
84 | ><DIV |
85 | CLASS="REFSECT1" |
86 | ><A |
87 | NAME="AEN4399" |
88 | ></A |
89 | ><H2 |
90 | >Structure Definition</H2 |
91 | ><PRE |
92 | CLASS="PROGRAMLISTING" |
93 | >typedef struct{ |
94 | Uint8 type; |
95 | Uint8 which; |
96 | Uint8 ball; |
97 | Sint16 xrel, yrel; |
98 | } SDL_JoyBallEvent;</PRE |
99 | ></DIV |
100 | ><DIV |
101 | CLASS="REFSECT1" |
102 | ><A |
103 | NAME="AEN4402" |
104 | ></A |
105 | ><H2 |
106 | >Structure Data</H2 |
107 | ><DIV |
108 | CLASS="INFORMALTABLE" |
109 | ><A |
110 | NAME="AEN4404" |
111 | ></A |
112 | ><P |
113 | ></P |
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117 | ><TBODY |
118 | ><TR |
119 | ><TD |
120 | ALIGN="LEFT" |
121 | VALIGN="TOP" |
122 | ><TT |
123 | CLASS="STRUCTFIELD" |
124 | ><I |
125 | >type</I |
126 | ></TT |
127 | ></TD |
128 | ><TD |
129 | ALIGN="LEFT" |
130 | VALIGN="TOP" |
131 | ><TT |
132 | CLASS="LITERAL" |
133 | >SDL_JOYBALLMOTION</TT |
134 | ></TD |
135 | ></TR |
136 | ><TR |
137 | ><TD |
138 | ALIGN="LEFT" |
139 | VALIGN="TOP" |
140 | ><TT |
141 | CLASS="STRUCTFIELD" |
142 | ><I |
143 | >which</I |
144 | ></TT |
145 | ></TD |
146 | ><TD |
147 | ALIGN="LEFT" |
148 | VALIGN="TOP" |
149 | >Joystick device index</TD |
150 | ></TR |
151 | ><TR |
152 | ><TD |
153 | ALIGN="LEFT" |
154 | VALIGN="TOP" |
155 | ><TT |
156 | CLASS="STRUCTFIELD" |
157 | ><I |
158 | >ball</I |
159 | ></TT |
160 | ></TD |
161 | ><TD |
162 | ALIGN="LEFT" |
163 | VALIGN="TOP" |
164 | >Joystick trackball index</TD |
165 | ></TR |
166 | ><TR |
167 | ><TD |
168 | ALIGN="LEFT" |
169 | VALIGN="TOP" |
170 | ><TT |
171 | CLASS="STRUCTFIELD" |
172 | ><I |
173 | >xrel</I |
174 | ></TT |
175 | >, <TT |
176 | CLASS="STRUCTFIELD" |
177 | ><I |
178 | >yrel</I |
179 | ></TT |
180 | ></TD |
181 | ><TD |
182 | ALIGN="LEFT" |
183 | VALIGN="TOP" |
184 | >The relative motion in the X/Y direction</TD |
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187 | ></TABLE |
188 | ><P |
189 | ></P |
190 | ></DIV |
191 | ></DIV |
192 | ><DIV |
193 | CLASS="REFSECT1" |
194 | ><A |
195 | NAME="AEN4425" |
196 | ></A |
197 | ><H2 |
198 | >Description</H2 |
199 | ><P |
200 | ><SPAN |
201 | CLASS="STRUCTNAME" |
202 | >SDL_JoyBallEvent</SPAN |
203 | > is a member of the <A |
204 | HREF="sdlevent.html" |
205 | ><SPAN |
206 | CLASS="STRUCTNAME" |
207 | >SDL_Event</SPAN |
208 | ></A |
209 | > union and is used when an event of type <TT |
210 | CLASS="LITERAL" |
211 | >SDL_JOYBALLMOTION</TT |
212 | > is reported.</P |
213 | ><P |
214 | >A <TT |
215 | CLASS="LITERAL" |
216 | >SDL_JOYBALLMOTION</TT |
217 | > event occurs when a user moves a trackball on the joystick. The field <TT |
218 | CLASS="STRUCTFIELD" |
219 | ><I |
220 | >which</I |
221 | ></TT |
222 | > is the index of the joystick that reported the event and <TT |
223 | CLASS="STRUCTFIELD" |
224 | ><I |
225 | >ball</I |
226 | ></TT |
227 | > is the index of the trackball (for a more detailed explaination see the <A |
228 | HREF="joystick.html" |
229 | >Joystick section</A |
230 | >). Trackballs only return relative motion, this is the change in position on the ball since it was last polled (last cycle of the event loop) and it is stored in <TT |
231 | CLASS="STRUCTFIELD" |
232 | ><I |
233 | >xrel</I |
234 | ></TT |
235 | > and <TT |
236 | CLASS="STRUCTFIELD" |
237 | ><I |
238 | >yrel</I |
239 | ></TT |
240 | >.</P |
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242 | ><DIV |
243 | CLASS="REFSECT1" |
244 | ><A |
245 | NAME="AEN4439" |
246 | ></A |
247 | ><H2 |
248 | >See Also</H2 |
249 | ><P |
250 | ><A |
251 | HREF="sdlevent.html" |
252 | ><SPAN |
253 | CLASS="STRUCTNAME" |
254 | >SDL_Event</SPAN |
255 | ></A |
256 | >, |
257 | <A |
258 | HREF="joystick.html" |
259 | >Joystick Functions</A |
260 | >, |
261 | <A |
262 | HREF="sdljoystickeventstate.html" |
263 | ><TT |
264 | CLASS="FUNCTION" |
265 | >SDL_JoystickEventState</TT |
266 | ></A |
267 | >, |
268 | <A |
269 | HREF="sdljoystickgetball.html" |
270 | ><TT |
271 | CLASS="FUNCTION" |
272 | >SDL_JoystickGetBall</TT |
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