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GVPACK(1)										GVPACK(1)

       gvpack - merge and pack disjoint graphs

       gvpack  [  -nguv?   ]  [ -mmargin ] [ -array[_flags][n] ] [ -ooutfile ] [ -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 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.

       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.

	      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" or "u".  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.  The "u" flag indicates
	      that the insertion order is based on the sortv attribute attached to each graph.

	      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 parts.

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

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

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

       -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 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.

       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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