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Tk_FontId(3)			      Tk Library Procedures			     Tk_FontId(3)

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NAME
       Tk_FontId, Tk_GetFontMetrics, Tk_PostscriptFontName - accessor functions for fonts

SYNOPSIS
       #include <tk.h>

       Font
       Tk_FontId(tkfont)

       Tk_GetFontMetrics(tkfont, fmPtr)

       int
       Tk_PostscriptFontName(tkfont, dsPtr)

ARGUMENTS
       Tk_Font tkfont (in)		   Opaque  font  token	being  queried.   Must	have been
					   returned by a previous call to Tk_GetFont.

       Tk_FontMetrics *fmPtr (out)	   Pointer to structure in which  the  font  metrics  for
					   tkfont  will  be stored. See DATA STRUCTURES below for
					   details.

       Tcl_DString *dsPtr (out) 	   Pointer to an initialized  Tcl_DString  to  which  the
					   name of the Postscript font that corresponds to tkfont
					   will be appended.
_________________________________________________________________

DESCRIPTION
       Given a tkfont, Tk_FontId returns the token that should	be  selected  into  an	XGCValues
       structure  in  order  to construct a graphics context that can be used to draw text in the
       specified font.

       Tk_GetFontMetrics computes the ascent, descent, and linespace of the tkfont in pixels  and
       stores  those  values  in  the structure pointer to by fmPtr.  These values can be used in
       computations such as to space multiple lines of text, to align the baselines  of  text  in
       different  fonts,  and  to vertically align text in a given region.  See the documentation
       for the font command for definitions of the terms ascent, descent, and linespace, used  in
       font metrics.

       Tk_PostscriptFontName  maps a tkfont to the corresponding Postscript font name that should
       be used when printing.  The return value is the size in points of the tkfont and the Post-
       script  font  name  is appended to dsPtr.  DsPtr must refer to an initialized Tcl_DString.
       Given a "reasonable" Postscript printer, the following screen font families  should  print
       correctly:

	      Avant  Garde,  Arial, Bookman, Courier, Courier New, Geneva, Helvetica, Monaco, New
	      Century Schoolbook, New York,  Palatino,	Symbol,  Times,  Times	New  Roman,  Zapf
	      Chancery, and Zapf Dingbats.

       Any  other font families may not print correctly because the computed Postscript font name
       may be incorrect or not exist on the printer.

DATA STRUCTURES
       The Tk_FontMetrics data structure is used by Tk_GetFontMetrics to return information about
       a font and is defined as follows:
	      typedef struct Tk_FontMetrics {
		  int ascent;
		  int descent;
		  int linespace;
	      } Tk_FontMetrics;

       The ascent field is the amount in pixels that the tallest letter sticks up above the base-
       line, plus any extra blank space added by the designer of the font.

       The descent is the largest amount in pixels that any letter  sticks  below  the	baseline,
       plus any extra blank space added by the designer of the font.

       The  linespace  is  the sum of the ascent and descent.  How far apart two lines of text in
       the same font should be placed so that none of the characters in one line overlap  any  of
       the characters in the other line.

SEE ALSO
       font(n), MeasureChar(3)

KEYWORDS
       font, measurement, Postscript

Tk					       8.0				     Tk_FontId(3)
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