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annotate docs/man3/SDL_JoyBallEvent.3 @ 4352:c8bf421431f9 SDL-1.2

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Fixed bug #853 Ludwig Nussel 2009-10-18 05:34:18 PDT src/joystick/linux/SDL_sysjoystick.c has some problems: - test_bit() might break with strict aliasing - test_bit() assumes array is Uint32 but its actually "unsigned long" on 64bit systems sizeof(long) != sizeof(Uint32). - the keybit array is too small - the arrays are unitialized so the number of detected buttons is quite random
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 16:14:57 +0000
parents 1238da4a7112
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rev   line source
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e5bc29de3f0a Updated from the SDL Documentation Project
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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