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FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
font
 
font(n) 		     Tk Built-In Commands		       font(n)



NAME
       font - Create and inspect fonts.

SYNOPSIS
       font option ?arg arg ...?

DESCRIPTION
       The  font  command  provides several facilities for dealing with fonts,
       such as defining named fonts and inspecting the actual attributes of  a
       font.  The command has several different forms, determined by the first
       argument.  The following forms are currently supported:

       font actual font ?-displayof window? ?option?
	      Returns  information  about  the	actual	attributes  that   are
	      obtained	when  font  is	used  on  window's display; the actual
	      attributes obtained may differ from the attributes requested due
	      to  platform-dependant  limitations, such as the availability of
	      font families and pointsizes.  font is a font  description;  see
	      FONT  DESCRIPTIONS below.  If the window argument is omitted, it
	      defaults to the main window.  If option  is  specified,  returns
	      the  value of that attribute; if it is omitted, the return value
	      is a list of all the attributes  and  their  values.   See  FONT
	      OPTIONS below for a list of the possible attributes.

       font configure fontname ?option? ?value option value ...?
	      Query or modify the desired attributes for the named font called
	      fontname.  If no option is specified, returns a list  describing
	      all  the	options  and  their  values for fontname.  If a single
	      option is specified with no  value,  then  returns  the  current
	      value  of that attribute.  If one or more option-value pairs are
	      specified, then the command modifies the	given  named  font  to
	      have the given values; in this case, all widgets using that font
	      will redisplay themselves using the new attributes for the font.
	      See FONT OPTIONS below for a list of the possible attributes.

       font create ?fontname? ?option value ...?
	      Creates  a new named font and returns its name.  fontname speci-
	      fies the name for the font; if it is omitted, then Tk  generates
	      a  new name of the form fontx, where x is an integer.  There may
	      be any number of option-value pairs, which provide  the  desired
	      attributes for the new named font.  See FONT OPTIONS below for a
	      list of the possible attributes.

       font delete fontname ?fontname ...?
	      Delete the specified named fonts.  If there  are	widgets  using
	      the  named  font, the named font won't actually be deleted until
	      all the instances are released.  Those widgets will continue  to
	      display  using  the  last known values for the named font.  If a
	      deleted named font is subsequently recreated with  another  call
	      to  font	create,  the  widgets  will use the new named font and
	      redisplay themselves using the new attributes of that font.

       font families ?-displayof window?
	      The return value is a list of the case-insensitive names of  all
	      font  families  that  exist  on window's display.  If the window
	      argument is omitted, it defaults to the main window.

       font measure font ?-displayof window? text
	      Measures the amount of space the string text would  use  in  the
	      given  font  when  displayed in window.  font is a font descrip-
	      tion; see FONT DESCRIPTIONS below.  If the  window  argument  is
	      omitted,	it  defaults  to the main window.  The return value is
	      the total width in pixels of text, not including the extra  pix-
	      els used by highly exaggerated characters such as cursive ``f''.
	      If the string contains newlines or tabs,	those  characters  are
	      not expanded or treated specially when measuring the string.

       font metrics font ?-displayof window? ?option?
	      Returns  information about the metrics (the font-specific data),
	      for font when it is used on window's display.  font  is  a  font
	      description;  see  FONT DESCRIPTIONS below.  If the window argu-
	      ment is omitted, it defaults to the main window.	If  option  is
	      specified,  returns  the value of that metric; if it is omitted,
	      the return value is a list of all the metrics and their  values.
	      See FONT METRICS below for a list of the possible metrics.

       font names
	      The  return value is a list of all the named fonts that are cur-
	      rently defined.

FONT DESCRIPTION
       The following formats are accepted as a font description anywhere  font
       is  specified as an argument above; these same forms are also permitted
       when specifying the -font option for widgets.

       [1] fontname
	      The name of a named font, created using the font create command.
	      When a widget uses a named font, it is guaranteed that this will
	      never cause an error, as long as the named font exists, no  mat-
	      ter  what  potentially  invalid or meaningless set of attributes
	      the named font has.  If the named font cannot be displayed  with
	      exactly  the specified attributes, some other close font will be
	      substituted automatically.

       [2] systemfont
	      The platform-specific name of a font, interpreted by the	graph-
	      ics  server.  This also includes, under X, an XLFD (see [4]) for
	      which a single ``*'' character was used to elide more  than  one
	      field  in  the middle of the name.  See PLATFORM-SPECIFIC issues
	      for a list of the system fonts.

       [3] family ?size? ?style? ?style ...?
	      A properly formed list whose first element is the  desired  font
	      family  and  whose  optional second element is the desired size.
	      The interpretation of the size attribute follows the same  rules
	      described  for  -size  in  FONT  OPTIONS	below.	Any additional
	      optional arguments following the size are font styles.  Possible
	      values for the style arguments are as follows:
	      normal	  bold	      roman	 italic underline   overstrike

       [4] X-font names (XLFD)
	      A Unix-centric font name	of  the  form  -foundry-family-weight-
	      slant-setwidth-addstyle-pixel-point-resx-resy-spacing-width-
	      charset-encoding.  The ``*'' character may be used to skip indi-
	      vidual  fields that the user does not care about.  There must be
	      exactly one ``*'' for each field skipped, except that a ``*'' at
	      the  end	of  the  XLFD skips any remaining fields; the shortest
	      valid XLFD is simply ``*'', signifying all fields  as  defaults.
	      Any fields that were skipped are given default values.  For com-
	      patibility, an XLFD always chooses a font of the specified pixel
	      size  (not  point  size);  although  this  interpretation is not
	      strictly correct, all existing applications using XLFDs  assumed
	      that  one  ``point''  was  in  fact  one pixel and would display
	      incorrectly (generally larger) if the  correct  size  font  were
	      actually used.

       [5] option value ?option value ...?
	      A  properly  formed  list of option-value pairs that specify the
	      desired attributes of the font, in the  same  format  used  when
	      defining a named font; see FONT OPTIONS below.

       When  font  description	font is used, the system attempts to parse the
       description according to each of the above five	rules,	in  the  order
       specified.   Cases [1] and [2] must match the name of an existing named
       font or of a system font.  Cases [3], [4], and [5] are accepted on  all
       platforms  and the closest available font will be used.	In some situa-
       tions it may not be possible to find any close  font  (e.g.,  the  font
       family  was  a  garbage	value);  in  that  case, some system-dependant
       default font is chosen.	If the font description does not match any  of
       the above patterns, an error is generated.

FONT METRICS
       The  following  options	are  used by the font metrics command to query
       font-specific data determined when the font was created.  These proper-
       ties  are  for  the whole font itself and not for individual characters
       drawn in that font.  In the following definitions, the ``baseline''  of
       a font is the horizontal line where the bottom of most letters line up;
       certain letters, such as lower-case ``g'' stick below the baseline.

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

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

       -linespace
	      Returns how far apart vertically in pixels  two  lines  of  text
	      using the same font should be placed so that none of the charac-
	      ters in one line overlap any of  the  characters	in  the  other
	      line.   This  is generally the sum of the ascent above the base-
	      line line plus the descent below the baseline.

       -fixed
	      Returns a boolean flag that is ``1'' if this  is	a  fixed-width
	      font,  where  each normal character is the same width as all the
	      other characters, or is ``0'' if this is a proportionally-spaced
	      font,  where  individual	characters have different widths.  The
	      widths of control characters, tab  characters,  and  other  non-
	      printing	characters  are  not  included	when  calculating this
	      value.

FONT OPTIONS
       The following options are supported on all platforms, and are used when
       constructing  a named font or when specifying a font using style [5] as
       above:

       -family name
	      The case-insensitive font family name.  Tk guarantees to support
	      the  font  families  named  Courier (a monospaced ``typewriter''
	      font), Times (a serifed ``newspaper'' font),  and  Helvetica  (a
	      sans-serif ``European'' font).  The most closely matching native
	      font family will automatically be substituted when  one  of  the
	      above font families is used.  The name may also be the name of a
	      native, platform-specific font family; in that case it will work
	      as  desired  on  one  platform  but may not display correctly on
	      other platforms.	If the family is unspecified or  unrecognized,
	      a platform-specific default font will be chosen.

       -size size
	      The  desired  size of the font.  If the size argument is a posi-
	      tive number, it is interpreted as a size in points.  If size  is
	      a  negative  number, its absolute value is interpreted as a size
	      in pixels.  If a font cannot be displayed at the specified size,
	      a nearby size will be chosen.  If size is unspecified or zero, a
	      platform-dependent default size will be chosen.

	      Sizes should normally be specified in points so the  application
	      will  remain the same ruler size on the screen, even when chang-
	      ing screen resolutions or moving scripts across platforms.  How-
	      ever,  specifying pixels is useful in certain circumstances such
	      as when a piece of text must line up with respect  to  a	fixed-
	      size  bitmap.  The mapping between points and pixels is set when
	      the application starts, based on	properties  of	the  installed
	      monitor, but it can be overridden by calling the tk scaling com-
	      mand.

       -weight weight
	      The nominal thickness of the characters in the font.  The  value
	      normal  specifies  a  normal weight font, while bold specifies a
	      bold font.  The closest available weight to  the	one  specified
	      will be chosen.  The default weight is normal.

       -slant slant
	      The  amount the characters in the font are slanted away from the
	      vertical.  Valid values for slant are roman and italic.  A roman
	      font  is	the  normal,  upright  appearance  of a font, while an
	      italic font is one that is tilted some number  of  degrees  from
	      upright.	 The closest available slant to the one specified will
	      be chosen.  The default slant is roman.

       -underline boolean
	      The value is a boolean flag that specifies whether characters in
	      this font should be underlined.  The default value for underline
	      is false.

       -overstrike boolean
	      The value is a boolean flag that specifies whether a  horizontal
	      line  should  be	drawn through the middle of characters in this
	      font.  The default value for overstrike is false.

PLATFORM-SPECIFIC ISSUES
       The following named system fonts are supported:

	      X Windows:
		     All valid X font names, including those  listed  by  xls-
		     fonts(1), are available.

	      MS Windows:
		     system	 ansi	     device	     systemfixed ansi-
		     fixed   oemfixed

	      Macintosh:
		     system	 application

EXAMPLE
       Fill a text widget with lots of font demonstrators, one for every  font
       family  installed  on your system: pack [text .t -wrap none] -fill both
       -expand 1 set count 0 set tabwidth 0 foreach family [lsort  -dictionary
       [font families]] {
	   .t tag configure f[incr count] -font [list $family 10]
	   .t insert end ${family}:\t {} \
		   "This is a simple sampler\n" f$count
	   set w [font measure [.t cget -font] ${family}:]
	   if {$w+5 > $tabwidth} {
	       set tabwidth [expr {$w+5}]
	       .t configure -tabs $tabwidth
	   } }


SEE ALSO
       options(n)


KEYWORDS
       font



Tk				      8.0			       font(n)
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