graph-easy man page

graph-easy — render/convert graphs in/from various formats

Synopsis

Convert between graph formats and layout/render graphs:

graph-easy [options] [inputfile [outputfile]]
echo "[ Bonn ] - car -> [ Berlin ]" | graph-easy
graph-easy --input=graph.dot --as_ascii
graph-easy --html --output=mygraph.html graph.txt
graph-easy graph.txt graph.svg
graph-easy graph.txt --as_dot | dot -Tpng -o graph.png
graph-easy graph.txt --png
graph-easy graph.vcg --dot
graph-easy graph.dot --gdl
graph-easy graph.dot --graphml

Arguments

Here are the most important options, more are listed in the full documentation:

--help
Print the full documentation, not just this short overview.
--input

Specify the input file name. Example:

graph-easy --input=input.txt

The format will be auto-detected, override it with --from.

--output

Specify the output file name. Example:

graph-easy --output=output.txt input.txt
--as

Specify the output format. Example:

graph-easy --as=ascii input.txt

Valid formats are:

ascii       ASCII art rendering
boxart      Unicode Boxart rendering
html        HTML
svg         Scalable Vector Graphics
graphviz    the DOT language
dot         alias for "graphviz"
txt         Graph::Easy text
vcg         VCG (Visualizing Compiler Graphs - a subset of GDL) text
gdl         GDL (Graph Description Language) text
graphml     GraphML

In addition, the following formats are understood and piped through the program specified with the --renderer option (default: dot):

bmp         Windows bitmap
gif         GIF
hpgl        HP-GL/2 vector graphic
jpg         JPEG
pcl         PCL printer language
pdf         PDF
png         PNG
ps          Postscript
ps2         Postscript with PDF notations (see graphviz documentation)
tga         Targa bitmap
tif         TIFF bitmap

The default format will be determined by the output filename extension, and is "ascii", if the output filename was not set.

You can also use ONE argument of the form "--as_ascii" or "--ascii".

--from

Specify the input format. Valid formats are:

graphviz    the DOT language
txt         Graph::Easy text
vcg         VCG text
gdl         GDL (Graph Description Language) text

If not specified, the input format is auto-detected.

You can also use ONE argument of the form "--from_dot", etc.

--renderer
The external program (default: "dot") used to render the output formats like "png", "jpg" etc. Some choices are "neato", "twopi", "fdp" or "circo".
--parse

Input will only be parsed, without any output generation. Useful in combination with "--debug=1" or "--stats". Example:

graph-easy input.txt --parse --debug=1
--stats

Write various statistics about the input graph to STDERR. Best used in combination with "--parse":

graph-easy input.txt --parse --stats
--timeout

Set the timeout in seconds for the Graph::Easy layouter that generates ASCII, HTML, SVG or boxart output. If the layout does not finish in this time, it will be aborted. Example:

graph-easy input.txt --timeout=500

Conversion to DOT, VCG/GDL, GraphML or plain text ignores the timeout.

The default is 240 seconds (4 minutes).

--verbose
Write info regarding the conversion process to STDERR.

Description

"graph-easy" reads a description of a graph (a connected network of nodes and edges, not a pie chart :-) and then converts this to the desired output format.

By default, the input will be read from STDIN, and the output will go to STDOUT. The input is expected to be encoded in UTF-8, the output will also be UTF-8.

It understands the following formats as input:

Graph::Easy  http://bloodgate.com/perl/graph/manual/
DOT          http://www.graphviz.org/
VCG          http://rw4.cs.uni-sb.de/~sander/html/gsvcg1.html
GDL          http://www.aisee.com/

The formats are automatically detected, regardless of the input file name, but you can also explicitly declare your input to be in one specific format.

The output can be a dump of the graph in one of the following formats:

Graph::Easy  http://bloodgate.com/perl/graph/manual/
DOT          http://www.graphviz.org/
VCG          http://rw4.cs.uni-sb.de/~sander/html/gsvcg1.html
GDL          http://www.aisee.com/
GraphML      http://graphml.graphdrawing.org/

In addition, "Graph::Easy" can also create layouts of graphs in one of the following output formats:

HTML   SVG   ASCII   BOXART

Note that for SVG output, you need to install the module Graph::Easy::As_svg first.

As a shortcut, you can also specify the output format as 'png', this will cause "graph-easy" to pipe the input in graphviz format to the "dot" program to create a PNG file in one step. The following two examples are equivalent:

graph-easy graph.txt --dot | dot -Tpng -o graph.png
graph-easy graph.txt --png

Other Arguments

"graph-easy" supports a few more arguments in addition to the ones from above:

--version
Write version info and exit.
--debug=N

Set the debug level (1..3). Warning, this will generate huge amounts of hard to understand output on STDERR. Example:

graph-easy input.txt --output=test.html --debug=1
--png, --dot, --vcg, --gdl, --txt, --ascii, --boxart, --html, --svg
Given exactly one of these options, produces the desired output format.

Examples

ASCII output

echo "[ Bonn ] -- car --> [ Berlin ], [ Ulm ]" | graph-easy
+--------+  car   +-----+
|  Bonn  | -----> | Ulm |
+--------+        +-----+
  |
  | car
  v
+--------+
| Berlin |
+--------+

Graphviz example output

echo "[ Bonn ] -- car --> [ Berlin ], [ Ulm ]" | graph-easy --dot
digraph GRAPH_0 {
  edge [ arrowhead=open ];
  graph [ rankdir=LR ];
  node [
    fontsize=11,
    fillcolor=white,
    style=filled,
    shape=box ];
  Bonn -> Ulm [ label=car ]
  Bonn -> Berlin [ label=car ]
}

VCG example output

echo "[ Bonn ] -- car --> [ Berlin ], [ Ulm ]" | graph-easy --vcg
graph: {
  title: "Untitled graph"
  node: { title: "Berlin" }
  node: { title: "Bonn" }
  node: { title: "Ulm" }
  edge:  { label: "car" sourcename: "Bonn" targetname: "Ulm" }
  edge:  { label: "car" sourcename: "Bonn" targetname: "Berlin" }
}

GDL example output

GDL (Graph Description Language) is a superset of VCG, and thus the output will look almost the same as VCG:

echo "[ Bonn ] -- car --> [ Berlin ], [ Ulm ]" | graph-easy --gdl
graph: {
  title: "Untitled graph"
  node: { title: "Berlin" }
  node: { title: "Bonn" }
  node: { title: "Ulm" }
  edge:  { label: "car" source: "Bonn" target: "Ulm" }
  edge:  { label: "car" source: "Bonn" target: "Berlin" }
}

GraphML example output

GraphML is XML:

echo "[ Bonn ] -- car --> [ Berlin ], [ Ulm ]" | graph-easy --graphml
<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
  <!-- Created by Graph::Easy v0.58 at Mon Aug 20 00:01:25 2007 -->
  <key id="d0" for="edge" attr.name="label" attr.type="string"/>
  <graph id="G" edgedefault="directed">
    <node id="Berlin">
</node>
    <node id="Bonn">
</node>
    <node id="Ulm">
</node>
    <edge source="Bonn" target="Berlin">
      <data key="d0">car</data>
</edge>
    <edge source="Bonn" target="Ulm">
      <data key="d0">car</data>
</edge>
  </graph>
<graphml>

Caveats

Please note that it is impossible to convert 100% from one format to another format since every graph language out there has features that are unique to only this language.

In addition, the conversion process always converts the input first into an Graph::Easy graph, and then to the desired output format.

This means that only features and attributes that are actually valid in Graph::Easy are supported yet. Work in making Graph::Easy an universal format supporting as much as possible is still in progress.

Attributes that are not yet supported natively by Graph::Easy are converted to custom attributes with a prefixed "x-format-", f.i. "x-dot-". Upon output to the same format, these are converted back, but conversion to a different format will lose these attributes.

For a list of what problems still remain, please see the TODO file in the "Graph::Easy" distribution on CPAN:

<http://search.cpan.org/~tels/Graph-Easy/>

If you notice anything wrong, or miss attributes, please file a bug report on

<http://rt.cpan.org/NoAuth/ReportBug.htm…>

so we can fix it and include the missing things into Graph::Easy!

License

This library is free software; you can redistribute it and/or modify it under the terms of the GPL.

See the License file of Graph::Easy for a copy of the GPL.

This product includes color specifications and designs developed by Cynthia Brewer (<http://colorbrewer.org/>). See the License file for the full license text that applies to these color schemes.

Author

Copyright (C) 2004 - 2008 by Tels <http://bloodgate.com>

See Also

More information can be found in the online manual of Graph::Easy:

<http://bloodgate.com/perl/graph/manual/>

See also: Graph::Easy, Graph::Easy::Manual

Info

2016-06-06 perl v5.24.0 User Contributed Perl Documentation