ncurses-5.7/man/curs_getyx.3x

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.\" $Id: curs_getyx.3x,v 1.16 2007/05/12 16:34:49 tom Exp $
.TH curs_getyx 3X ""
.SH NAME
\fBgetyx\fR,
\fBgetparyx\fR,
\fBgetbegyx\fR,
\fBgetmaxyx\fR - get \fBcurses\fR cursor and window coordinates
.SH SYNOPSIS
\fB#include <curses.h>\fR
.sp
\fBvoid getyx(WINDOW *win, int y, int x);\fR
.br
\fBvoid getparyx(WINDOW *win, int y, int x);\fR
.br
\fBvoid getbegyx(WINDOW *win, int y, int x);\fR
.br
\fBvoid getmaxyx(WINDOW *win, int y, int x);\fR
.br
.SH DESCRIPTION
The \fBgetyx\fR macro places the current cursor position of the given window in
the two integer variables \fIy\fR and \fIx\fR.
.PP
If \fIwin\fR is a subwindow, the \fBgetparyx\fR macro places the beginning
coordinates of the subwindow relative to the parent window into two integer
variables \fIy\fR and \fIx\fR.
Otherwise, \fB-1\fR is placed into \fIy\fR and \fIx\fR.
.PP
Like \fBgetyx\fR, the \fBgetbegyx\fR and \fBgetmaxyx\fR macros store
the current beginning coordinates and size of the specified window.
.SH RETURN VALUE
The return values of these macros are undefined (i.e.,
they should not be used as the right-hand side of assignment statements).
.SH NOTES
All of these interfaces are macros.
A "\fB&\fR" is not necessary before the variables \fIy\fR and \fIx\fR.
.SH PORTABILITY
The
\fBgetyx\fR,
\fBgetparyx\fR,
\fBgetbegyx\fR and
\fBgetmaxyx\fR
macros are described in the XSI Curses standard, Issue 4.
.PP
This implementation also provides functions
\fBgetbegx\fR,
\fBgetbegy\fR,
\fBgetcurx\fR,
\fBgetcury\fR,
\fBgetmaxx\fR,
\fBgetmaxy\fR,
\fBgetparx\fR and
\fBgetpary\fR
for compatibility with older versions of curses.
.PP
Although X/Open Curses does not address this,
many implementations provide members of the WINDOW structure
containing values corresponding to these macros.
For best portability, do not rely on using the data in WINDOW,
since some implementations make WINDOW opaque (do not allow
direct use of its members).
.PP
Besides the problem of opaque structures,
the data stored in like-named members may not have like-values in
different implementations.
For example, the WINDOW._maxx and WINDOW._maxy values in ncurses
have (at least since release 1.8.1) differed by one from some
other implementations.
The difference is hidden by means of the macro \fBgetmaxyx\fP.
.SH SEE ALSO
\fBcurses\fR(3X),
\fBcurs_legacy\fR(3X),
\fBcurs_opaque\fR(3X)
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