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| >SDL_JoyBallEvent</H1 |
| ><DIV |
| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN4396" |
| ></A |
| ><H2 |
| >Name</H2 |
| >SDL_JoyBallEvent -- Joystick trackball motion event structure</DIV |
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| CLASS="REFSECT1" |
| ><A |
| NAME="AEN4399" |
| ></A |
| ><H2 |
| >Structure Definition</H2 |
| ><PRE |
| CLASS="PROGRAMLISTING" |
| >typedef struct{ |
| Uint8 type; |
| Uint8 which; |
| Uint8 ball; |
| Sint16 xrel, yrel; |
| } SDL_JoyBallEvent;</PRE |
| ></DIV |
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| ><H2 |
| >Structure Data</H2 |
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| ><TT |
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| ><I |
| >type</I |
| ></TT |
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| ><TT |
| CLASS="LITERAL" |
| >SDL_JOYBALLMOTION</TT |
| ></TD |
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| ><TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >which</I |
| ></TT |
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| >Joystick device index</TD |
| ></TR |
| ><TR |
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| ><TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >ball</I |
| ></TT |
| ></TD |
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| VALIGN="TOP" |
| >Joystick trackball index</TD |
| ></TR |
| ><TR |
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| ALIGN="LEFT" |
| VALIGN="TOP" |
| ><TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >xrel</I |
| ></TT |
| >, <TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >yrel</I |
| ></TT |
| ></TD |
| ><TD |
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| >The relative motion in the X/Y direction</TD |
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| ><A |
| NAME="AEN4425" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| ><SPAN |
| CLASS="STRUCTNAME" |
| >SDL_JoyBallEvent</SPAN |
| > is a member of the <A |
| HREF="sdlevent.html" |
| ><SPAN |
| CLASS="STRUCTNAME" |
| >SDL_Event</SPAN |
| ></A |
| > union and is used when an event of type <TT |
| CLASS="LITERAL" |
| >SDL_JOYBALLMOTION</TT |
| > is reported.</P |
| ><P |
| >A <TT |
| CLASS="LITERAL" |
| >SDL_JOYBALLMOTION</TT |
| > event occurs when a user moves a trackball on the joystick. The field <TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >which</I |
| ></TT |
| > is the index of the joystick that reported the event and <TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >ball</I |
| ></TT |
| > is the index of the trackball (for a more detailed explaination see the <A |
| HREF="joystick.html" |
| >Joystick section</A |
| >). 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 |
| CLASS="STRUCTFIELD" |
| ><I |
| >xrel</I |
| ></TT |
| > and <TT |
| CLASS="STRUCTFIELD" |
| ><I |
| >yrel</I |
| ></TT |
| >.</P |
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| ><H2 |
| >See Also</H2 |
| ><P |
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| HREF="sdlevent.html" |
| ><SPAN |
| CLASS="STRUCTNAME" |
| >SDL_Event</SPAN |
| ></A |
| >, |
| <A |
| HREF="joystick.html" |
| >Joystick Functions</A |
| >, |
| <A |
| HREF="sdljoystickeventstate.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_JoystickEventState</TT |
| ></A |
| >, |
| <A |
| HREF="sdljoystickgetball.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_JoystickGetBall</TT |
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