Tk_FontId man page on UnixWare

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Tk_FontId(3)		     Tk Library Procedures		  Tk_FontId(3)

______________________________________________________________________________

NAME
       Tk_FontId,  Tk_FontMetrics,  Tk_PostscriptFontName - accessor functions
       for fonts

SYNOPSIS
       #include <tk.h>

       Font
       Tk_FontId(tkfont)

       void
       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 previ‐
					   ous call to Tk_GetFont.

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

       Tcl_DString	*dsPtr	 (out)	   Pointer    to    an	   initialized
					   Tcl_DString	to  which  the name of
					   the	Postscript  font  that	corre‐
					   sponds 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 mul‐
       tiple 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 Postcript font
       name that should be used when printing.	The return value is  the  size
       in  points  of  the  tkfont and the Postscript font name is appended to
       dsPtr.  DsPtr must refer to an initialized Tcl_DString.	Given a ``rea‐
       sonable'' Postscript printer, the following screen font families should
       print correctly:

	      Avant Garde, Arial, Bookman, Courier, Courier New, Geneva,  Hel‐
	      vetica, Monaco, New Century Schoolbook, New York, Palatino, Sym‐
	      bol, 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 linespace field is the amount in pixels  that  the  tallest	letter │
       sticks  up  above the baseline, 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.

KEYWORDS
       font

Tk				      8.0			  Tk_FontId(3)
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