font man page on HP-UX

Man page or keyword search:  
man Server   10987 pages
apropos Keyword Search (all sections)
Output format
HP-UX logo
[printable version]

Font(3)		      User Contributed Perl Documentation	       Font(3)

       font - Create and inspect fonts.

	$widget->Font(option?, arg, arg, ...?)

	$font->Option?(arg, arg, ...)?

       The Font method 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:

       $widget->fontActual(font?, -option?)
	   Returns information about the actual attributes that are obtained
	   when font is used on $font'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 DESCRIPTION"
	   below.  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(-option??=>value, -option=>value, ...?)
	   Query or modify the desired attributes for $font.  If no -option is
	   specified, returns a list describing all the options and their val‐
	   ues 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 method modifies the
	   given named font to have the given values; in this case, all wid‐
	   gets using that font will redisplay themselves using the new
	   attributes for the font.  See "FONT OPTIONS" below for a list of
	   the possible attributes.

	   Note: the above behaviour differs in detail to configure on wid‐
	   gets, images etc.

       $font = $widget->Font(-option=>value, ...>?)
       $font = $widget->fontCreate(?fontname??, -option=>value, ...>?)
	   Creates a new font object and returns a reference to it.  fontname
	   specifies the name for the font; if it is omitted, then Tk gener‐
	   ates 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.

	   Note: the created font is not shared between widgets of different

       $widget->fontDelete(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 fontCreate, the
	   widgets will use the new named font and redisplay themselves using
	   the new attributes of that font.

	   The return value is a list of the case-insensitive names of all
	   font families that exist on $widget's display.

       $widget->fontMeasure(font, text)
	   Measures the amount of space the string text would use in the given
	   font when displayed in $widget.  font is a font description; see
	   "FONT DESCRIPTION" below.  The return value is the total width in
	   pixels of text, not including the extra pixels used by highly
	   exagerrated characters such as cursive ``f''.  If the string con‐
	   tains newlines or tabs, those characters are not expanded or
	   treated specially when measuring the string.

       $widget->fontMetrics(font?, -option?)
	   Returns information about the metrics (the font-specific data), for
	   font when it is used on $widget's display.  font is a font descrip‐
	   tion; see "FONT DESCRIPTION" below.	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.

	   The return value is a list of all font objects that are currently
	   defined for $widget's MainWindow.

       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 fontCreate method.
	   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 matter
	   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

       [1a] $font
	   A font object created using the Font method. This is essentially
	   the same as using a named font. The object is a reference to the
	   name, and carries additional information e.g. which MainWindow it
	   relates to in an manner peculiar to perl/Tk.

       [3] systemfont
	   The platform-specific name of a font, interpreted by the graphics
	   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 fam‐
	   ily 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-fam‐
	   ing-width-charset-encoding.	The ``*'' character may be used to
	   skip individual 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 short‐
	   est valid XLFD is simply ``*'', signifying all fields as defaults.
	   Any fields that were skipped are given default values.  For compat‐
	   ibility, an XLFD always chooses a font of the specified pixel size
	   (not point size); although this interpretation is not strictly cor‐
	   rect, all existing applications using XLFDs assumed that one
	   ``point'' was in fact one pixel and would display incorrectly (gen‐
	   erally 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 defin‐
	   ing 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.

       The following options are used by the metrics/fontMetrics method to
       query font-specific data determined when the font was created.  These
       properties are for the whole font itself and not for individual charac‐
       ters drawn in that font.	 In the following definitions, the ``base‐
       line'' of a font is the horizontal line where the bottom of most let‐
       ters line up; certain letters, such as lower-case ``g'' stick below the

	   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.  ($font-<gt>ascent is provided for compati‐

	   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.  ($font-<gt>descent is provided for compati‐

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

	   Returns a boolean flag that is ``1'' if this is a fixed-width font,
	   where each normal character is the 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 charac‐
	   ters are not included when calculating this value.

       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

       -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 fami‐
	   lies 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 positive
	   number, it is interpreted as a size in points.  If size is a nega‐
	   tive 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-depen‐
	   dent default size will be chosen.

	   The original Tcl/Tk authors believe sizes should normally be speci‐
	   fied in points so the application will remain the same ruler size
	   on the screen, even when changing screen resolutions or moving
	   scripts across platforms. While this is an admirable goal it does
	   not work as well in practice as they hoped.	The mapping between
	   points and  pixels is set when the application starts, based on
	   alleged properties of the installed monitor, but it can be overrid‐
	   den by calling the  scaling command. However this can be problem‐
	   atic when system has no way of telling if (say) an 11" or 22" moni‐
	   tor is attached, also if it can tell then some monitor sizes may
	   result in poorer quality scaled fonts being used rather than a
	   "tuned" bitmap font.	 In addition specifying pixels is useful in
	   certain circumstances such as when a piece of text must line up
	   with respect to a fixed-size bitmap.

	   At present the Tcl/Tk scheme is used unchanged, with "point" size
	   being returned by actual (as an integer), and used internally. Sug‐
	   gestions for work-rounds to undesirable behaviour welcome.

       -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

       -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.

       The following named system fonts are supported:

       X Windows:
	   All valid X font names, including those listed by xlsfonts(1), are

       MS Windows:
	    system	 ansi	    device
	    systemfixed	 ansifixed  oemfixed

	    system	 application

       In prior versions of perl/Tk the $widget->Font method was a perl wrap‐
       per on the original "[4] X-font names (XLFD)" style as described above
       (which was the only form supported by versions of core tk prior to ver‐
       sion tk8.0).  This module is provided in its original form (it has just
       been renamed) via:

	use Tk::X11Font;

       However the methods of the old scheme have been mimiced as closely as
       possible with the new scheme. It is intended that code should work
       without modification, except for the case of using :

	 @names = $font->Name;

       i.e. the Name method in an array/list context. This now returns one
       element on all platforms (as it did on Win32), while previously on X
       systems it returned a list of fonts that matched an under-specified

       Briefly the methods supported for compatibilty are as follows:

       $newfont = $font->Clone(-option=>value, ...>?)
	   Returns a new font object $newfont related to the original $font by
	   changing the values of the specified -options.

       $font->Family - maps to -family
       $font->Weight - maps to -weight
       $font->Slant - maps to -slant
       $font->Pixel and Point - map to -size

       New code should use $font->configure to achieve same effect as last
       four items above.

       Foundry, Swidth, Adstyle, Xres, Yres, Space, Avgwidth, Registry, Encod‐
	   Are all ignored if set, and return '*' if queried.

	   Returns the name of a named font, or a string representation of an
	   unnamed font. Using $font in a scalar context does the same. Note
	   this is distinctly different from behaviour of X11Font's Name in a
	   list context.

	   Returns a XLFD string for the font based on actual values, and some
	   heuristics to map Tk's forms to the "standard" X conventions.




perl v5.8.8			  2004-02-28			       Font(3)

List of man pages available for HP-UX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net