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NAME    [Toc]    [Back]

       grn - groff preprocessor for gremlin files

SYNOPSIS    [Toc]    [Back]

       grn [ -Cv ] [ -Tdev ] [ -Mdir ] [ -Fdir ] [ file...  ]

       It  is  possible to have whitespace between a command line
       option and its parameter.

DESCRIPTION    [Toc]    [Back]

       grn is a preprocessor for including  gremlin  pictures  in
       groff  input.   grn  writes to standard output, processing
       only input lines between two that start with .GS and  .GE.
       Those  lines must contain grn commands (see below).  These
       commands request a gremlin file, and the picture  in  that
       file  is  converted  and placed in the troff input stream.
       The .GS request may be followed by a C, L, or R to center,
       left,  or right justify the whole gremlin picture (default
       justification is center).  If no file  is  mentioned,  the
       standard  input  is  read.  At the end of the picture, the
       position on the page is the bottom of the gremlin picture.
       If  the  grn  entry  is ended with .GF instead of .GE, the
       position is left at the top of the picture.

       Please note that currently only the -me macro package  has
       support for .GS, .GE, and .GF.

       The following command-line options are understood:

       -Tdev  Prepare output for printer dev.  The default device
              is ps.  See groff(1) for acceptable devices.

       -Mdir  Set the library to directory  dir.   If  a  gremlin
              file  cannot be found in the current directory, dir
              is prepended to the filename for a second try.  The
              default library directory is /usr/share/tmac.

       -Fdir  Search  dir for subdirectories devname (name is the
              name of the device) for the DESC  file  before  the
              normal /usr/share/groff_font.

       -C     Recognize  .GS  and .GE (resp.  .GF) even when followed
 by a character other than space or newline.

       -v     Print the version number.

GRN COMMANDS    [Toc]    [Back]

       Each input line between .GS and .GE may have one grn  command.
  Commands consist of one or two strings separated by
       white space, the first string being the  command  and  the
       second  its  operand.  Commands may be upper or lower case
       and abbreviated down to one character.

       Commands that affect a picture's environment (those listed
       before default, see below) are only in effect for the current
 picture: The  environment  is  reinitialized  to  the
       defaults  at  the start of the next picture.  The commands
       are as follows:

       1 N
       2 N
       3 N
       4 N    Set gremlin's text size number 1 (2, 3, or 4) to  N
              points.   The default is 12 (resp. 16, 24, and 36).

       roman f
       italics f
       bold f
       special f
              Set the roman (italics, bold, or special)  font  to
              troff's  font  f  (either  a  name or number).  The
              default is R (resp. I, B, and S).

       l f
       stipple f
              Set the stipple font  to  troff's  stipple  font  f
              (name  or  number).   The  command  stipple  may be
              abbreviated down as far as `st' (to avoid confusion
              with  special).   There  is no default for stipples
              (unless one is set by the default command), and  it
              is  illegal to include a gremlin picture with polygons
 without specifying a stipple font.

       x N
       scale N
              Magnify the picture (in  addition  to  any  default
              magnification) by N, a floating point number larger
              than zero.  The command scale  may  be  abbreviated
              down to `sc'.

       narrow N
       medium N
       thick N
              Set the thickness of gremlin's narrow (resp. medium
              and thick) lines to N times 0.15pt (this value  can
              be  changed  at  compile time).  The default is 1.0
              (resp. 3.0 and 5.0), which  corresponds  to  0.15pt
              (resp.  0.45pt  and  0.75pt).  A thickness value of
              zero selects the smallest available line thickness.
              Negative values cause the line thickness to be proportional
 to the current point size.

       pointscale <off/on>
              Scale text to match the picture.  Gremlin  text  is
              usually  printed  in  the point size specified with
              the commands 1, 2, 3, or 4 regardless of any  scaling
  factors  in  the  picture.  Setting pointscale
              will cause the point sizes to scale with  the  picture
  (within  troff's limitations, of course).  An
              operand of anything but off will turn text  scaling

              Reset  the picture environment defaults to the settings
 in the current picture.  This is meant to  be
              used as a global parameter setting mechanism at the
              beginning of the troff input file, but can be  used
              at any time to reset the default settings.

       width N
              Forces the picture to be N inches wide.  This overrides
 any scaling factors present in the same  picture.
  `width 0' is ignored.

       height N
              Forces  picture  to  be  N  inches high, overriding
              other  scaling  factors.   If  both   `width'   and
              `height'  are specified the tighter constraint will
              determine the scale of  the  picture.   Height  and
              width  commands  are  not saved with a default command.
  They will, however, affect point size  scaling
 if that option is set.

       file name
              Get picture from gremlin file name located the current
 directory (or in the  library  directory;  see
              the  -M  option  above).   If two file commands are
              given, the second one overrides the first.  If name
              doesn't  exist,  an  error  message is reported and
              processing continues from the .GE line.

NOTES ABOUT GROFF    [Toc]    [Back]

       Since grn is a preprocessor, it doesn't know about current
       indents,  point  sizes,  margins,  number  registers, etc.
       Consequently, no troff input can be placed between the .GS
       and  .GE requests.  However, gremlin text is now processed
       by troff, so anything legal in  a  single  line  of  troff
       input  is  legal  in  a  line of gremlin text (barring `.'
       directives at the beginning of a line).  Thus, it is  possible
 to have equations within a gremlin figure by including
 in the gremlin file eqn expressions enclosed by previously
 defined delimiters (e.g.  $$).

       When  using grn along with other preprocessors, it is best
       to run tbl before grn, pic, and/or ideal  to  avoid  overworking
 tbl.  Eqn should always be run last.

       A  picture  is considered an entity, but that doesn't stop
       troff from trying to break it up if it falls off  the  end
       of  a  page.   Placing  the picture between `keeps' in -me
       macros will ensure proper placement.

       grn uses troff's number registers g1 through g9  and  sets
       registers g1 and g2 to the width and height of the gremlin
       figure (in device units) before entering the  .GS  request
       (this is for those who want to rewrite these macros).

GREMLIN FILE FORMAT    [Toc]    [Back]

       There  exist two distinct gremlin file formats, the original
 format from the AED graphic terminal version, and  the
       SUN  or  X11 version.  An extension to the SUN/X11 version
       allowing reference points with negative coordinates is not
       compatible  with  the  AED  version.  As long as a gremlin
       file does not contain negative coordinates, either  format
       will  be  read  correctly  by either version of gremlin or
       grn.  The other difference to the SUN/X11  format  is  the
       use  of  names  for picture objects (e.g., POLYGON, CURVE)
       instead of numbers.  Files representing the  same  picture
       are shown in Table 1 in each format.

                 sungremlinfile        gremlinfile
                 0 240.00 128.00       0 240.00 128.00
                 CENTCENT              2
                 240.00 128.00         240.00 128.00
                 185.00 120.00         185.00 120.00
                 240.00 120.00         240.00 120.00
                 296.00 120.00         296.00 120.00
                 *                     -1.00 -1.00
                 2 3                   2 3
                 10 A Triangle         10 A Triangle
                 POLYGON               6
                 224.00 416.00         224.00 416.00
                 96.00 160.00          96.00 160.00

                 384.00 160.00         384.00 160.00
                 *                     -1.00 -1.00
                 5 1                   5 1
                 0                     0
                 -1                    -1

                        Table 1. File examples

       o      The first line of each gremlin file contains either
              the string gremlinfile (AED version) or sungremlin-
              file (SUN/X11)

       o      The  second  line  of the file contains an orientation,
 and x and y values for a  positioning  point,
              separated  by spaces.  The orientation, either 0 or
              1, is ignored by the SUN/X11 version.  0 means that
              gremlin  will  display  things in horizontal format
              (drawing area wider than  it  is  tall,  with  menu
              across  top).   1  means  that gremlin will display
              things in vertical format (drawing area taller than
              it  is  wide, with menu on left side).  x and y are
              floating point values giving a positioning point to
              be  used  when this file is read into another file.
              The stuff on this line really isn't all that important;
 a value of ``1 0.00 0.00'' is suggested.

       o      The  rest of the file consists of zero or more element
 specifications.  After the last element specification
 is a line containing the string ``-1''.


       o      The  first  line  of each element contains a single
              decimal number giving the type of the element  (AED
              version)  or its ASCII name (SUN/X11 version).  See
              Table 2.

                gremlin File Format - Object Type Specification

            AED Number   SUN/X11 Name           Description
                 0       BOTLEFT        bottom-left-justified text
                 1       BOTRIGHT       bottom-right-justified text
                 2       CENTCENT       center-justified text
                 3       VECTOR         vector
                 4       ARC            arc
                 5       CURVE          curve
                 6       POLYGON        polygon
                10       TOPLEFT        top-left-justified text
                11       TOPCENT        top-center-justified text
                12       TOPRIGHT       top-right-justified text
                13       CENTLEFT       left-center-justified text
                14       CENTRIGHT      right-center-justified text
                15       BOTCENT        bottom-center-justified text

                                    Table 2.
                      Type Specifications in gremlin Files

       o      After the object type comes a  variable  number  of
              lines,  each specifying a point used to display the
              element.  Each line contains an x-coordinate and  a
              y-coordinate in floating point format, separated by
              spaces.  The list of points is terminated by a line
              containing  the  string ``-1.0 -1.0'' (AED version)
              or a single asterisk, ``*'' (SUN/X11 version).

       o      After the points comes a line containing two  decimal
  values, giving the brush and size for the element.
  The brush  determines  the  style  in  which
              things  are  drawn.   For vectors, arcs, and curves
              there are six legal brush values:

                        1 -       thin dotted lines
                        2 -       thin dot-dashed lines
                        3 -       thick solid lines
                        4 -       thin dashed lines
                        5 -       thin solid lines
                        6 -       medium solid lines

              For polygons, one more  value,  0,  is  legal.   It
              specifies  a polygon with an invisible border.  For
              text, the brush selects a font as follows:

                      1 -       roman (R font in groff)
                      2 -       italics (I font in groff)
                      3 -       bold (B font in groff)
                      4 -       special (S font in groff)

              If you're using grn to run  your  pictures  through
              groff, the font is really just a starting font: The
              text string can contain formatting  sequences  like
              ``\fI''  or  ``\d''  which  may change the font (as
              well as do many other things).  For text, the  size
              field  is  a  decimal  value  between  1 and 4.  It
              selects the size of the font in which the text will
              be  drawn.  For polygons, this size field is interpreted
 as a stipple  number  to  fill  the  polygon
              with.   The  number is used to index into a stipple
              font at print time.

       o      The last line of each element  contains  a  decimal
              number  and  a string of characters, separated by a
              single space.  The number is a count of the  number
              of  characters  in the string.  This information is
              only used for text elements, and contains the  text
              string.   There can be spaces inside the text.  For
              arcs, curves, and vectors, this line of the element
              contains the string ``0''.


       gremlin was designed for AEDs, and its coordinates reflect
       the AED coordinate space.  For vertical pictures, x-values
       range  116  to 511, and y-values from 0 to 483.  For horizontal
 pictures, x-values range from 0 to 511 and y-values
       range  from  0  to  367.   Although you needn't absolutely
       stick to this range, you'll get best  results  if  you  at
       least stay in this vicinity.  Also, point lists are terminated
 by a point of (-1, -1), so you  shouldn't  ever  use
       negative  coordinates.   gremlin  writes  out  coordinates
       using format ``%f1.2''; it's probably a good idea  to  use
       the same format if you want to modify the grn code.

       There  is  no longer a restriction on the range of coordinates
 used to create objects in  the  SUN/X11  version  of
       gremlin.   However,  files  with negative coordinates will
       cause problems if displayed on the AED.

FILES    [Toc]    [Back]

              Device description file for device name.

SEE ALSO    [Toc]    [Back]

       gremlin(1), groff(1), pic(1), ideal(1)

HISTORY    [Toc]    [Back]

       David Slattengren and Barry Roitblat  wrote  the  original
       Berkeley grn.

       Daniel  Senderowicz  and  Werner  Lemberg  modified it for

Groff Version 1.16.1      April 8, 2001                    GRN(1)
[ Back ]
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