Libnetpbm PPM Drawing Function Manual(3)		     Library Functions Manual			  Libnetpbm PPM Drawing Function Manual(3)

       Table Of Contents <#toc>

NAME

       libnetpbm_draw - Libnetpbm PPM Drawing Function Manual

DESCRIPTION

       This  reference manual covers functions in the libnetpbm library for drawing images, using the PPM image format and the libnetpbm in-memory
       image formats.

       We actually have very little information here; this is mainly a framework for adding documentation later if someone becomes  interested	in
       this facility.

The Functions
       The functions are all declared in the ppmdraw.h header file.

   ppmd_point_drawproc
   ppmd_setlinetype
   ppmd_setlineclip
   ppmd_line
   ppmd_spline3
   ppmd_polyspline
   ppmd_circle
   ppmd_filledrectangle
   ppmd_fill_drawproc
   ppmd_fill
   ppmd_text
   ppmd_text_box
Fonts
       The  ppmd_text  and ppmd_text_box functions use fonts.  You control the fonts using functions described in this section.  There is one font
       that comes with Netpbm, called 'standard'.  It is built into the function library and is the default font.  You can create additional fonts
       and use them instead.

       In  a  program that uses Netpbm drawing facilities, there is a 'current font.' all drawing of text uses the current font.  When the program
       starts, the current font is 'standard'; you can change it after that by calling the ppmd_set_font function.

       Other than a built-in font, a font lives in file in a format special to Netpbm called Ppmdfont.	The file typically has a name that ends in
       '.ppmdfont'.

       Use the ppmddumpfont program to dump the contents of a Ppmdfont file in human readable format.

       Use  the  ppmdmkfont program to generate the 'standard' font as a Ppmdfont file.  You don't normally need to do this, because 'standard' is
       built into libnetpbm.

       Use the ppmdcfont program to turn a Ppmdfont file into a C source file that you can compile into a program as a built-in font.	Though	we
       don't  give  full  instructions here on how to do that, libnetpbm's built-in 'standard' font is a good example.	In Netpbm source code, you
       will find the C source file standardppmdfont.c, which was generated from the file standard.ppmdfont by ppmdcfont.  You simply use a pointer
       to the structure that the C file defines as a font handle, just like one you would get from ppmd_read_font.

Font File Format
       The font file starts with the characters 'ppmdfont' (without the quotation marks) in ASCII.

       The  rest  of  the format is not yet documented, but it generally describes, for each code point, a sequence of straight line plotting com-
       mands to form the glyph for the indicated character.  I.e. it is a vector, not raster, font.

Font Control Functions
       These functions are declared in the header file ppmdfont.h.

   ppmd_read_font
       This function associates a Ppmdfont file, which you identify by naming the Ppmdfont file, with a handle that you can use  to  identify  the
       font to other functions.  Technically, this function reads the font into memory.

   ppmd_free_font
       This  function releases the handle that you get from ppmd_read_font.  It frees resources associated with it; you can't use the handle after
       this.

   ppmd_get_font
       This function returns the handle of the currently selected font.

   ppmd_set_font
       This function sets the currently selected font.	You identify the font to which to set it with a handle such as you get from ppmd_read_font
       or ppmd_get_font.

netpbm documentation						  September 2005			  Libnetpbm PPM Drawing Function Manual(3)