38 lines
994 B
Groff
38 lines
994 B
Groff
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.TH "SDL_JoystickGetBall" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
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.SH "NAME"
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SDL_JoystickGetBall \- Get relative trackball motion
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.SH "SYNOPSIS"
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.PP
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\fB#include "SDL\&.h"
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.sp
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\fBint \fBSDL_JoystickGetBall\fP\fR(\fBSDL_Joystick *joystick, int ball, int *dx, int *dy\fR);
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.SH "DESCRIPTION"
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.PP
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Get the \fBball\fR axis change\&.
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.PP
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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\&.
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.SH "RETURN VALUE"
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.PP
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Returns \fB0\fR on success or \fB-1\fR on failure
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.SH "EXAMPLES"
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.PP
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.PP
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.nf
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\f(CWint delta_x, delta_y;
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SDL_Joystick *joy;
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\&.
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\&.
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\&.
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SDL_JoystickUpdate();
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if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1)
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printf("TrackBall Read Error!
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");
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printf("Trackball Delta- X:%d, Y:%d
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", delta_x, delta_y);\fR
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.fi
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.PP
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.SH "SEE ALSO"
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.PP
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\fI\fBSDL_JoystickNumBalls\fP\fR
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00
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