getrootcrd.3

linux系统下的音频通信

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'\" Copyright (c) 1990 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\" SCCS: @(#) GetRootCrd.3 1.9 96/03/26 18:12:16
'\" 
.so man.macros
.TH Tk_GetRootCoords 3 "" Tk "Tk Library Procedures"
.BS
.SH NAME
Tk_GetRootCoords \- Compute root-window coordinates of window
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
\fBTk_GetRootCoords\fR(\fItkwin, xPtr, yPtr\fR)
.SH ARGUMENTS
.AS Tk_Window tkwin
.AP Tk_Window tkwin in
Token for window.
.AP int *xPtr out
Pointer to location in which to store root-window x-coordinate
corresponding to left edge of \fItkwin\fR's border.
.AP int *yPtr out
Pointer to location in which to store root-window y-coordinate
corresponding to top edge of \fItkwin\fR's border.
.BE

.SH DESCRIPTION
.PP
This procedure scans through the structural information maintained
by Tk to compute the root-window coordinates corresponding to
the upper-left corner of \fItkwin\fR's border.  If \fItkwin\fR has
no border, then \fBTk_GetRootCoords\fR returns the root-window
coordinates corresponding to location (0,0) in \fItkwin\fR.
\fBTk_GetRootCoords\fR is relatively efficient, since it doesn't have to
communicate with the X server.

.SH KEYWORDS
coordinates, root window