draw-font man page on Inferno

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DRAW-FONT(2)							  DRAW-FONT(2)

NAME
       Font - character images for Unicode text

SYNOPSIS
       include	 "draw.m";
       draw := load Draw Draw->PATH;

       Font: adt
       {
	   name:    string;
	   height:  int;
	   ascent:  int;
	   display: ref Display;

	   open:    fn(d: ref Display, file:  string):	      ref Font;
	   build:   fn(d: ref Display, name, desc: string):   ref Font;
	   width:   fn(f: self ref Font, str: string):	      int;
       };

DESCRIPTION
       The  Font  type	defines	 the  appearance  of characters drawn with the
       Image.text primitive (see draw-image(2)).  Fonts are usually read  from
       files and are selected based on their size, their style, the portion of
       Unicode space they represent, and so on.

       Fonts are built from a series of subfonts that define  contiguous  por‐
       tions  of  the  Unicode character space, such as the ASCII or the Greek
       alphabet.  Font files are textual descriptions  of  the	allocation  of
       characters in the various regions of the Unicode space; see font(6) for
       the format.  Subfonts are not visible from Limbo.

       A default font, named *default*, is always available.

       The type incorporates:

       ascent, height
		 These define the vertical sizes of the font, in pixels.   The
		 ascent is the distance from the font baseline to the top of a
		 line of text; height gives the interline  spacing,  that  is,
		 the distance from one baseline to the next.

       name	 This  field  identifies the font, either the name of the file
		 from which the font was read, or "*default*" for the  default
		 font.

       display	 Tells on which display the font resides.

       open(d, file)
		 The open method creates a Font by reading the contents of the
		 named file.  Fonts are cached, so an open request may	return
		 a  pointer  to	 an existing Font, without rereading the file.
		 The name "*default*" always describes a defined font.	 Fonts
		 are  created for an instance of a Display object, even though
		 the creation functions are in type Font.

       build(d, name, desc)
		 Build creates a Font object by reading the  description  from
		 the  string desc rather than a file.  Name specifies the name
		 of the font to be created.

       f.width( str )
		 The width method returns the width in pixels that  str	 would
		 occupy if drawn by Image.text in the Font f.

								  DRAW-FONT(2)
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