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[[wikipedia:Graphviz|Graphviz]] is a graphical package available as a {{SITENAME}} extension. 
The generated graphs can contain "hot spots" defined by URL tags, as illustrated in the first example.

==Examples==
The first graph, which has "hot spots" defined as hyperlinks, was produced by the markup shown immediately below it.

<graphviz>
digraph G {
 C [URL="http://en.wikipedia.org/wiki/C programming language"];
 Java [URL="http://en.wikipedia.org/wiki/Java programming language"];
 C -> Java
}
</graphviz>

<pre>
<graphviz>
digraph G {
 C [URL="http://en.wikipedia.org/wiki/C programming language"];
 Java [URL="http://en.wikipedia.org/wiki/Java programming language"];
 C -> Java
}
</graphviz>
</pre>

To create a hyperlink to a {{SITENAME}} page named Xyzzy, one could simply write URL="Xyzzy".
----
Links can be automatically generated for all the nodes in a graph as illustrated in the following example.
<graphviz>
digraph G {
  node [URL="http://en.wikipedia.org/wiki/\N"]; 
  X -> Y
}
</graphviz>

<pre>
<graphviz>
digraph G {
  node [URL="http://en.wikipedia.org/wiki/\N"]; 
  X -> Y
}
</graphviz>
</pre>

----

The following example comes from [http://www.wickle.com/wikis/index.php/Graphviz_extension], which
has a Creative Commons [http://creativecommons.org/licenses/by-sa/2.0/ "Attribution-ShareAlike"] statement of availability.

<graphviz>
digraph G {
size ="4,4";
main [shape=box]; /* this is a comment */
main -> parse [weight=8];
parse -> execute;
main -> init [style=dotted];
main -> cleanup;
execute -> { make_string; printf}
init -> make_string;
edge [color=red]; // so is this
main -> printf [style=bold,label="100 times"];
make_string [label="make a\nstring"];
node [shape=box,style=filled,color=".7 .3 1.0"];
execute -> compare;
}
</graphviz>

<pre>
 <graphviz>
 digraph G {
 size ="4,4";
 main [shape=box]; /* this is a comment */
 main -> parse [weight=8];
 parse -> execute;
 main -> init [style=dotted];
 main -> cleanup;
 execute -> { make_string; printf}
 init -> make_string;
 edge [color=red]; // so is this
 main -> printf [style=bold,label="100 times"];
 make_string [label="make a\nstring"];
 node [shape=box,style=filled,color=".7 .3 1.0"];
 execute -> compare;
 }
</graphviz>
</pre>

==Documentation==
Documentation is available at http://www.graphviz.org/Documentation.php
Note that this installation of Graphviz uses the DOT language and the dot program.

==See also==
* [http://www.graphviz.org/Gallery.php The Graphviz Gallery]
* [[Help:JpGraph]]

<!-- keywords flow chart diagram -->

[[Category:MediaWiki Extensions]]
[[Category:Visualization Tool]]

Return to Graphviz.

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