pkgsrc/graphics/graphviz で make install すると dot 等が入る。 それを使って見る。

graph hello {

// Comment: Hello World from ``dot``
// a graph with a single node Node1

Node1 [label="Hello, World!"]

}

dot -Tps hello.dot  > /tmp/ps
gs /tmp/ps

digraph simple_hierarchy {

B [label="Hello"]      // node B
E [label="World !"]  // node E

B->E [label=" graphviz and dot ", fontcolor=darkgreen] // edge B->E

}

上では -Tps として PostScript 形式で出力したが、他にも次のようなものが使える

-Tps	(PostScript)
-Tsvg -Tsvgz	(Structured Vector Graphics)
-Tfig	(XFIG graphics)
-Tmif	(FrameMaker graphics)
-Thpgl	(HP pen plotters)
-Tpcl	(Laserjet printers)
-Tpng -Tjpg -Tgif	(pixel graphics)
-Timap	(imagemap files for httpd servers that mark out rectangles
	for each node that has a non-null "href" attribute.)
-Tcmapx	(client-side imagemap for use in html and xhtml).
-Tismap and -Tcmap	Obsolete