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  70. NAME="SDLJOYSTICKGETBALL"
  71. >SDL_JoystickGetBall</A
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  76. NAME="AEN5886"
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  79. >Name</H2
  80. >SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
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  87. >Synopsis</H2
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  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
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  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
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  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
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  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
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  185. >See Also</H2
  186. ><P
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  188. HREF="sdljoysticknumballs.html"
  189. ><TT
  190. CLASS="FUNCTION"
  191. >SDL_JoystickNumBalls</TT
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