GVPACK
Section: User Commands (1)
Updated: 27 May 2010
Page Index
NAME
gvpack  merge and pack disjoint graphs
SYNOPSIS
gvpack
[
nguv?
]
[
mmargin
]
[
arrayopts
]
[
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 toplevel 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 rowmajor 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 columnmajor 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 nonnegative 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 nonzero 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 noncluster
subgraphs.
AUTHORS
Emden R. Gansner <
erg@research.att.com>
SEE ALSO
gvpr(1),
dot(1),
neato(1),
twopi(1),
ccomps(1),
libpack(3)