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annotate docs/man3/SDL_JoyBallEvent.3 @ 4159:a1b03ba2fcd0 SDL-1.2

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:25:42 +0000
parents 4e3b250c950e
children 1238da4a7112
rev   line source
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1 .TH "SDL_JoyBallEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_JoyBallEvent \- Joystick trackball motion event structure
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4 .SH "STRUCTURE DEFINITION"
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5 .PP
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6 .nf
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7 \f(CWtypedef struct{
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8 Uint8 type;
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9 Uint8 which;
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10 Uint8 ball;
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11 Sint16 xrel, yrel;
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12 } SDL_JoyBallEvent;\fR
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13 .fi
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14 .PP
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15 .SH "STRUCTURE DATA"
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16 .TP 20
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17 \fBtype\fR
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18 \fBSDL_JOYBALLMOTION\fP
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19 .TP 20
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20 \fBwhich\fR
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21 Joystick device index
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22 .TP 20
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23 \fBball\fR
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24 Joystick trackball index
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25 .TP 20
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26 \fBxrel\fR, \fByrel\fR
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27 The relative motion in the X/Y direction
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28 .SH "DESCRIPTION"
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29 .PP
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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\&.
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31 .PP
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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\&.
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33 .SH "SEE ALSO"
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34 .PP
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35 \fI\fBSDL_Event\fR\fR, \fIJoystick Functions\fR, \fI\fBSDL_JoystickEventState\fP\fR, \fI\fBSDL_JoystickGetBall\fP\fR
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36 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59