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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.
#
#
=head1 NAME
Tk_GetAnchor, Tk_NameOfAnchor - translate between strings and anchor positions
=for category C Programming
=head1 SYNOPSIS
B<#include E<lt>tk.hE<gt>>
int
B<Tk_GetAnchor(>I<interp, string, anchorPtr>B<)>
char *
B<Tk_NameOfAnchor(>I<anchor>B<)>
=head1 ARGUMENTS
=over 4
=item Tcl_Interp *interp (in)
Interpreter to use for error reporting.
=item char *string (in)
String containing name of anchor point: one of ``n'', ``ne'', ``e'', ``se'',
``s'', ``sw'', ``w'', ``nw'', or ``center''.
=item int *anchorPtr (out)
Pointer to location in which to store anchor position corresponding to
I<string>.
=item Tk_Anchor anchor (in)
Anchor position, e.g. B<TCL_ANCHOR_CENTER>.
=back
=head1 DESCRIPTION
B<Tk_GetAnchor> places in I<*anchorPtr> an anchor position
(enumerated type B<Tk_Anchor>)
corresponding to I<string>, which will be one of
B<TK_ANCHOR_N>, B<TK_ANCHOR_NE>, B<TK_ANCHOR_E>, B<TK_ANCHOR_SE>,
B<TK_ANCHOR_S>, B<TK_ANCHOR_SW>, B<TK_ANCHOR_W>, B<TK_ANCHOR_NW>,
or B<TK_ANCHOR_CENTER>.
Anchor positions are typically used for indicating a point on an object
that will be used to position that object, e.g. B<TK_ANCHOR_N> means
position the top center point of the object at a particular place.
Under normal circumstances the return value is B<TCL_OK> and
I<interp> is unused.
If I<string> doesn't contain a valid anchor position
or an abbreviation of one of these names, then an error message is
stored in I<interp-E<gt>result>, B<TCL_ERROR> is returned, and
I<*anchorPtr> is unmodified.
B<Tk_NameOfAnchor> is the logical inverse of B<Tk_GetAnchor>.
Given an anchor position such as B<TK_ANCHOR_N> it returns a
statically-allocated string corresponding to I<anchor>.
If I<anchor> isn't a legal anchor value, then
``unknown anchor position'' is returned.
=head1 KEYWORDS
anchor position
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