NAME

       gvpack - merge and pack disjoint graphs

SYNOPSIS

       gvpack  [  -nguv?   ]  [ -mmargin ] [ -array[_flags][n] ] [ -ooutfile ] [ -sgraph_name ] [
       -Gname=value ] [ files ]

DESCRIPTION

       gvpack reads in a stream of graphs, combines the graphs into a single layout, and produces
       a  single  graph serving as the union of the input graphs. The input graphs must be in dot
       format, and must have all necessary layout information. Acceptable input  is  produced  by
       applying a Graphviz layout program, such as dot or neato, with no -T flag.

       By  default,  the  packing is done at the cluster level. Thus, parts of one graph will not
       intrude into any top‐level clusters or overlap any nodes or edges of another.

       The output of gvpack can be used to produce concrete output by applying neato -s -n2  with
       the desired -T flag.

OPTIONS

       The following options are supported:

       -g     Combines the graphs at the graph level. This uses more space, but prevents parts of
              one graph from occurring between parts of another.

       -array[_flags][n]
              Combines the graphs at the graph level, placing them in an array.  By default,  the
              layout is done in row-major order. The number of columns used is roughly the square
              root of the number of graphs. If the optional integer n is supplied, this indicates
              the number of columns to use.

       If optional flags are supplied, these consist of an underscore followed
              by any of the letters "c", "t", "b", "l", "r", "u" or "i".  If "c" is supplied, the
              graphs are packed in column-major order, in which case a  final  integer  specifies
              the  number  of  rows.   The  flags "t", "b", "l", "r" indicate that components are
              aligned along the top, bottom,  left  or  right,  respectively.   By  default,  the
              insertion  order  is determined by sorting the graphs by size, largest to smallest.
              If the "u" flag is set, the graphs are sorted based  on  the  non-negative  integer
              sortv  attribute attached to each graph.  The "i" flag indicates that no sorting is
              done, with the graphs inserted in input order.

       -Gname=value
              Specifies attributes to be added to the resulting union graph.  For  example,  this
              can be used to specify a graph label.

       -mmargin
              Packs the graphs allowing a margin of output points around the parts.

       -n     Combines the graphs at the node level. Clusters are ignored in the packing.

       -ooutput
              Prints output to the file output. If not given, gvpack uses stdout.

       -sgraph_name
              Use graph_name as the name of the root graph. By default, "root" is used.

       -u     Don't pack the graphs. Just combine them into a single graph.

       -v     Verbose mode.

       -?     Prints usage information and exit.

OPERANDS

       The following operand is supported:

       files   Names  of files containing 1 or more graphs in dot format.  If no files operand is
               specified, the standard input will be used.

RETURN CODES

       gvpack returns 0 if there were no problems, and non‐zero otherwise.

EXAMPLES

       ccomps -x abc.gv | dot | gvpack | neato -s -n2 -Tps
       This pipeline decomposes the graph in abc.gv into its connected components, lays out  each
       using dot, packs them all together again, and produces the final drawing in PostScript. Of
       course, there is nothing to prevent one from using different layouts for each component.

BUGS

       All the input graphs must be directed or undirected.

       An input graph should not have a label, since this will  be  used  in  its  layout.  Since
       gvpack ignores root graph labels, resulting layout may contain some extra space.

       gvpack unsets the bounding box attribute of all non‐cluster subgraphs.

AUTHORS

       Emden R. Gansner <erg@research.att.com>

SEE ALSO

       gvpr(1), dot(1), neato(1), twopi(1), ccomps(1), libpack(3)

                                           27 May 2010                                  GVPACK(1)