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  68. ><H1
  69. ><A
  70. NAME="SDLJOYBALLEVENT"
  71. >SDL_JoyBallEvent</A
  72. ></H1
  73. ><DIV
  74. CLASS="REFNAMEDIV"
  75. ><A
  76. NAME="AEN3963"
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  78. ><H2
  79. >Name</H2
  80. >SDL_JoyBallEvent&nbsp;--&nbsp;Joystick trackball motion event structure</DIV
  81. ><DIV
  82. CLASS="REFSECT1"
  83. ><A
  84. NAME="AEN3966"
  85. ></A
  86. ><H2
  87. >Structure Definition</H2
  88. ><PRE
  89. CLASS="PROGRAMLISTING"
  90. >typedef struct{
  91.   Uint8 type;
  92.   Uint8 which;
  93.   Uint8 ball;
  94.   Sint16 xrel, yrel;
  95. } SDL_JoyBallEvent;</PRE
  96. ></DIV
  97. ><DIV
  98. CLASS="REFSECT1"
  99. ><A
  100. NAME="AEN3969"
  101. ></A
  102. ><H2
  103. >Structure Data</H2
  104. ><DIV
  105. CLASS="INFORMALTABLE"
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  107. NAME="AEN3971"
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  109. ><P
  110. ></P
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  114. ><TBODY
  115. ><TR
  116. ><TD
  117. ALIGN="LEFT"
  118. VALIGN="TOP"
  119. ><TT
  120. CLASS="STRUCTFIELD"
  121. ><I
  122. >type</I
  123. ></TT
  124. ></TD
  125. ><TD
  126. ALIGN="LEFT"
  127. VALIGN="TOP"
  128. ><TT
  129. CLASS="LITERAL"
  130. >SDL_JOYBALLMOTION</TT
  131. ></TD
  132. ></TR
  133. ><TR
  134. ><TD
  135. ALIGN="LEFT"
  136. VALIGN="TOP"
  137. ><TT
  138. CLASS="STRUCTFIELD"
  139. ><I
  140. >which</I
  141. ></TT
  142. ></TD
  143. ><TD
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  146. >Joystick device index</TD
  147. ></TR
  148. ><TR
  149. ><TD
  150. ALIGN="LEFT"
  151. VALIGN="TOP"
  152. ><TT
  153. CLASS="STRUCTFIELD"
  154. ><I
  155. >ball</I
  156. ></TT
  157. ></TD
  158. ><TD
  159. ALIGN="LEFT"
  160. VALIGN="TOP"
  161. >Joystick trackball index</TD
  162. ></TR
  163. ><TR
  164. ><TD
  165. ALIGN="LEFT"
  166. VALIGN="TOP"
  167. ><TT
  168. CLASS="STRUCTFIELD"
  169. ><I
  170. >xrel</I
  171. ></TT
  172. >, <TT
  173. CLASS="STRUCTFIELD"
  174. ><I
  175. >yrel</I
  176. ></TT
  177. ></TD
  178. ><TD
  179. ALIGN="LEFT"
  180. VALIGN="TOP"
  181. >The relative motion in the X/Y direction</TD
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  189. ><DIV
  190. CLASS="REFSECT1"
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  194. ><H2
  195. >Description</H2
  196. ><P
  197. ><SPAN
  198. CLASS="STRUCTNAME"
  199. >SDL_JoyBallEvent</SPAN
  200. > is a member of the <A
  201. HREF="sdlevent.html"
  202. ><SPAN
  203. CLASS="STRUCTNAME"
  204. >SDL_Event</SPAN
  205. ></A
  206. > union and is used when an event of type <TT
  207. CLASS="LITERAL"
  208. >SDL_JOYBALLMOTION</TT
  209. > is reported.</P
  210. ><P
  211. >A <TT
  212. CLASS="LITERAL"
  213. >SDL_JOYBALLMOTION</TT
  214. > event occurs when a user moves a trackball on the joystick. The field <TT
  215. CLASS="STRUCTFIELD"
  216. ><I
  217. >which</I
  218. ></TT
  219. > is the index of the joystick that reported the event and <TT
  220. CLASS="STRUCTFIELD"
  221. ><I
  222. >ball</I
  223. ></TT
  224. > is the index of the trackball (for a more detailed explaination see the <A
  225. HREF="joystick.html"
  226. >Joystick section</A
  227. >). 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
  228. CLASS="STRUCTFIELD"
  229. ><I
  230. >xrel</I
  231. ></TT
  232. > and <TT
  233. CLASS="STRUCTFIELD"
  234. ><I
  235. >yrel</I
  236. ></TT
  237. >.</P
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  239. ><DIV
  240. CLASS="REFSECT1"
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  242. NAME="AEN4006"
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  244. ><H2
  245. >See Also</H2
  246. ><P
  247. ><A
  248. HREF="sdlevent.html"
  249. ><SPAN
  250. CLASS="STRUCTNAME"
  251. >SDL_Event</SPAN
  252. ></A
  253. >,
  254. <A
  255. HREF="joystick.html"
  256. >Joystick Functions</A
  257. >,
  258. <A
  259. HREF="sdljoystickeventstate.html"
  260. ><TT
  261. CLASS="FUNCTION"
  262. >SDL_JoystickEventState</TT
  263. ></A
  264. >,
  265. <A
  266. HREF="sdljoystickgetball.html"
  267. ><TT
  268. CLASS="FUNCTION"
  269. >SDL_JoystickGetBall</TT
  270. ></A
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