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GraphvizPlugin

Draw graphs using the GraphViz utility

GraphViz is a way of representing structural information as diagrams of abstract graphs and networks. Automatic graph drawing has many important applications in software engineering, database and web design, networking, and in visual interfaces for many other domains.

This plugin uses Graphviz's applications to create an image of a directed graph. The directed graph is described using a simple text markup called "The DOT Language". This markup is written between <graphviz> and </graphviz> tags or using the %GRAPHVIZ macro. By default, an svg image attachment is created and displayed inline, replacing the <graphviz> markup.

Visit the Graphviz gallery to see some examples on what can be achieved with this plugin and Graphviz.

Full documentation is available at http://graphviz.org/Documentation.php.

Usage

There are two ways to specify a graph:

  1. using the <graphviz> xml tag
  2. using the %GRAPHVIZ Foswiki macro

Both can be used to generate a graph inline, that is by specifying the DOT language as part of the page. Below examples are mostly equivalent:

<graphviz renderer="dot" type="png">
digraph G {Hello[fontcolor="red"]; Hello->World}
</graphviz>

%GRAPHVIZ{
   "digraph G {Hello[fontcolor=\"red\"]; Hello->World}" 
   renderer="dot"
   type="png"
}%

Both should render as

hello world.png

when installed.

The <graphviz> xml syntax has got the advantage of being in line with other wikis, such as dokuwiki. Also, the DOT code does not have to escape any double-quotes (") as is the case using the Foswiki macro way. However using a proper %GRAPHVIZ macro has got the advantage of being well integrated into Foswiki's Topic Markup Language. For instance it can be properly escaped when in a FormattedSearch.

For compatibility with DirectedGraphPlugin you may use <dot> instead of <graphviz>.

Syntax

<graphviz [params]> ... DOT code ... <graphviz>

%GRAPHVIZ{" ... DOT code ... " [params]}%

Parameter Description Default
DOT code this is the graph specified in the graph description language  
type="png|jpeg|gif|svg|svgz|pdf" output format svg
renderer="dot|neato|twopi|circle|fdp|sfdp|patchwork" rendering engine dot
topic="[web.]topic" specify the topic where to store the graph image current topic
attachment=" ... " attachment that may hold a .gv graph file (only available in %GRAPHVIZ)  
section=" ... " named section in topic that holds a graph description (only available in %GRAPHVIZ)  
library="[web.]topic" specify the topic where to search for images to be used in the dot graph topic
inline="on|off" boolean flag to specify the way how to add an svg result to the html page; if inline="on" then an <svg> html tag is generated; otherwise an html <img ... > tag is used; note that for properly linking URLs in the graphviz graph you will need to switch this on off
expand="on|off" boolean flag, when switched on, will expand TML macros in the DOT code before rendering it off
style=" ... " css styles to be added to the output  
width=" ... " width of the image result  
height=" ... " height of the image result  

Graphviz from Table

Instead of having to learn the dot language, nodes and edges can also be specified in Foswiki tables:

Node Attributes
hello color="red"
world shape=box

Source Label Target Attributes
hello   world  

Given these two tables where the only two tables in a topic then this would render the appropriate graph:

%GRAPHVIZ{
   topic="SomeTopic"

   nodestable="0" 
   nodecol="0"
   nodeattrcol="1"

   edgestable="1"
   sourcecol="0"
   labelcol="1"
   targetcol="2"
   edgeattrcol="3"
}%

Parameter Description Default
table="int" / edgestable="int" index of table in topic to extract edges from  
nodestable="int" index of table in topic to extract nodes from  
nodecol="int" index of column that holds the node name 0
nodeattrcol="int" index of colum that holds node attributs  
sourcecol="int" index of the colum holding the source node name 0
targetcol="int" index of the colum holding the target node name 1
labelcol="int" index of column holding the edge label  
edgeattrcol="int" index of column holding the edge attributes  
preamble=" ... " some dot code to be added before the generated node and edge code  

Examples

Example 1

%GRAPHVIZ{ section="example1" main_init_label="high priority" main_printf_label="low priority" }%

%STARTSECTION{"example1"}%
digraph G {
 node [fontname=Verdana,
       fontsize=12,
       style=filled,
       fillcolor="#EEEEEE",
       color="#EEEEEE"]

 edge [fontname=Verdana,
       fontsize=10,
       color="#31CEF0"]

 main [shape=box, color=deeppink]
 init [shape=box, color=deeppink]

 main -> parse -> execute [weight=8]

 main -> init [taillabel="%main_init_label{default=""}%",
               labelangle=-20,
               labeldistance=7,
               color=deeppink, 
               arrowhead=vee, 
               arrowtail=vee]

 main -> cleanup
 main -> printf [taillabel="%main_printf_label{default=""}%",
               labelangle=15,
               labeldistance=7]

 execute -> make_string
 execute -> printf 
 init -> make_string
 execute -> compare
}
%ENDSECTION{"example1"}%

Example 2

%GRAPHVIZ{attachment="softmaint.txt" renderer="neato" style="width:99%;height:auto"}%

Installation Instructions

You do not need to install anything in the browser to use this extension. The following instructions are for the administrator who installs the extension on the server.

Open configure, and open the "Extensions" section. Use "Find More Extensions" to get a list of available extensions. Select "Install".

If you have any problems, or if the extension isn't available in configure, then you can still install manually from the command-line. See http://foswiki.org/Support/ManuallyInstallingExtensions for more help.

Dependencies

NameVersionDescription
Digest::MD5>=0Required
File::Path>=0Required
File::Temp>=0Required
graphviz>=0Required
msttcorefontsOptional

Change History

02 Mar 2016: fixed error on dot command format; improved error reporting
07 Oct 2015: compatibility with foswiki >= 2.0.2
31 Aug 2015: first final release
11 Aug 2015: release of first beta
10 Aug 2015: initial rewrite of DirectedGraphPlugin

Topic revision: r4 - 02 Mar 2016, MichaelDaum - This page was cached on 26 Aug 2016 - 21:41.

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