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  71 ><H1
  72 ><A
  73 NAME="SDLJOYBALLEVENT"
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  75 >SDL_JoyBallEvent</H1
  76 ><DIV
  77 CLASS="REFNAMEDIV"
  78 ><A
  79 NAME="AEN4396"
  80 ></A
  81 ><H2
  82 >Name</H2
  83 >SDL_JoyBallEvent&nbsp;--&nbsp;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
 114 ><TABLE
 115 BORDER="0"
 116 CLASS="CALSTABLE"
 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
 185 ></TR
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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
 241 ></DIV
 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
 273 ></A
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