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)