Mercurial > sdl-ios-xcode
comparison docs/man3/SDL_JoystickGetBall.3 @ 0:74212992fb08
Initial revision
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Thu, 26 Apr 2001 16:45:43 +0000 |
| parents | |
| children | 55f1f1b3e27d |
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| -1:000000000000 | 0:74212992fb08 |
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| 1 .TH "SDL_JoystickGetBall" "3" "Mon 12 Mar 2001, 01:03" "SDL" "SDL API Reference" | |
| 2 .SH "NAME" | |
| 3 SDL_JoystickGetBall\- Get relative trackball motion | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBint \fBSDL_JoystickGetBall\fP\fR(\fBSDL_Joystick *joystick, int ball, int *dx, int *dy\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
| 11 Get the \fBball\fR axis change\&. | |
| 12 .PP | |
| 13 Trackballs can only return relative motion since the last call to \fBSDL_JoystickGetBall\fP, these motion deltas a placed into \fBdx\fR and \fBdy\fR\&. | |
| 14 .SH "RETURN VALUE" | |
| 15 .PP | |
| 16 Returns \fB0\fR on success or \fB-1\fR on failure | |
| 17 .SH "EXAMPLES" | |
| 18 .PP | |
| 19 .PP | |
| 20 .nf | |
| 21 \f(CWint delta_x, delta_y; | |
| 22 SDL_Joystick *joy; | |
| 23 \&. | |
| 24 \&. | |
| 25 \&. | |
| 26 SDL_JoystickUpdate(); | |
| 27 if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1) | |
| 28 printf("TrackBall Read Error! | |
| 29 "); | |
| 30 printf("Trackball Delta- X:%d, Y:%d | |
| 31 ", delta_x, delta_y);\fR | |
| 32 .fi | |
| 33 .PP | |
| 34 .SH "SEE ALSO" | |
| 35 .PP | |
| 36 \fI\fBSDL_JoystickNumBalls\fP\fR | |
| 37 ...\" created by instant / docbook-to-man, Mon 12 Mar 2001, 01:03 |