1 .TH "SDL_JoyBallEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference"
3 SDL_JoyBallEvent \- Joystick trackball motion event structure
4 .SH "STRUCTURE DEFINITION"
12 } SDL_JoyBallEvent;\fR
18 \fBSDL_JOYBALLMOTION\fP
24 Joystick trackball index
26 \fBxrel\fR, \fByrel\fR
27 The relative motion in the X/Y direction
30 \fBSDL_JoyBallEvent\fR is a member of the \fI\fBSDL_Event\fR\fR union and is used when an event of type \fBSDL_JOYBALLMOTION\fP is reported\&.
32 A \fBSDL_JOYBALLMOTION\fP event occurs when a user moves a trackball on the joystick\&. The field \fBwhich\fR is the index of the joystick that reported the event and \fBball\fR is the index of the trackball (for a more detailed explaination see the \fIJoystick section\fR)\&. 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 \fBxrel\fR and \fByrel\fR\&.
35 \fI\fBSDL_Event\fR\fR, \fIJoystick Functions\fR, \fI\fBSDL_JoystickEventState\fP\fR, \fI\fBSDL_JoystickGetBall\fP\fR
36 .\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59