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

       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  nec-
       essary  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.

       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

              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.

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

              Packs  the  graphs allowing a margin of output points around the

       -v     Verbose mode.

       -?     Prints usage information and exit.

       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.

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

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

       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.

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

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

                                  27 May 2010                        GVPACK(1)
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