NAME

       Tk_GetAnchorFromObj,  Tk_GetAnchor, Tk_NameOfAnchor - translate between strings and anchor
       positions

SYNOPSIS

       #include <tk.h>

       int
       Tk_GetAnchorFromObj(interp, objPtr, anchorPtr)

       int
       Tk_GetAnchor(interp, string, anchorPtr)

       const char *
       Tk_NameOfAnchor(anchor)

ARGUMENTS

       Tcl_Interp *interp (in)            Interpreter to use for error reporting, or NULL.

       Tcl_Obj *objPtr (in/out)           String value contains name of anchor point: “n”,  “ne”,
                                          “e”,  “se”, “s”, “sw”, “w”, “nw”, or “center”; internal
                                          rep will be modified to cache corresponding  Tk_Anchor.
                                          In   the   case  of  “center”  on  input,  a  non-empty
                                          abbreviation of it may also be used on input.

       const char *string (in)            Same as objPtr except description of  anchor  point  is
                                          passed as a string.

       int *anchorPtr (out)               Pointer  to  location in which to store anchor position
                                          corresponding to objPtr or string.

       Tk_Anchor anchor (in)              Anchor position, e.g. TCL_ANCHOR_CENTER.
_________________________________________________________________________________________________

DESCRIPTION

       Tk_GetAnchorFromObj places in *anchorPtr an anchor position  (enumerated  type  Tk_Anchor)
       corresponding  to  objPtr's  value.   The result will be one of TK_ANCHOR_N, TK_ANCHOR_NE,
       TK_ANCHOR_E,  TK_ANCHOR_SE,  TK_ANCHOR_S,  TK_ANCHOR_SW,  TK_ANCHOR_W,  TK_ANCHOR_NW,   or
       TK_ANCHOR_CENTER.  Anchor positions are typically used for indicating a point on an object
       that will be used to position the object, e.g. TK_ANCHOR_N means position the  top  center
       point of the object at a particular place.

       Under  normal  circumstances  the  return value is TCL_OK and interp is unused.  If string
       does not contain a valid anchor position  or  an  abbreviation  of  one  of  these  names,
       TCL_ERROR  is  returned,  *anchorPtr  is  unmodified,  and  an  error message is stored in
       interp's result if interp is not NULL.  Tk_GetAnchorFromObj caches information  about  the
       return  value in objPtr, which speeds up future calls to Tk_GetAnchorFromObj with the same
       objPtr.

       Tk_GetAnchor is identical to Tk_GetAnchorFromObj except that the description of the anchor
       is  specified with a string instead of an object.  This prevents Tk_GetAnchor from caching
       the return value, so Tk_GetAnchor is less efficient than Tk_GetAnchorFromObj.

       Tk_NameOfAnchor is the logical inverse of Tk_GetAnchor.  Given an anchor position such  as
       TK_ANCHOR_N  it  returns a statically-allocated string corresponding to anchor.  If anchor
       is not a legal anchor value, then “unknown anchor position” is returned.

KEYWORDS

       anchor position