Can you build reusable styles in GraphViz?

“Sometimes the answer is ‘no’.” So, no. GraphViz lacks the notion of “named styles” seen in word processors like Microsoft Word and LibreOffice, and lacks the style “class” notion from HTML and CSS. Its formatting attributes are more primitive and, in many cases, must be explicitly stated. You can set some defaults, as in its … Read more

Rank attribute is confusing to me

Leaving the rank empty or using rank=same are used far more often. These other four are usually only used in special circumstances. When used alone, min and source have the same function: putting all those nodes on the minimum rank (the top row of a TB graph). The difference between them is that min will … Read more

GraphViz Node Placement and Rankdir

Two useful techniques for reproducing graph layouts are: Invisible nodes Rank constraints Here’s a quick try for the top nodes: digraph g{ ranksep=0.2; node[shape=box3d, width=2.3, height=0.6, fontname=”Arial”]; n1[label=”Incident Commander”]; n2[label=”Public Information\nOfficer”]; n3[label=”Liaison Officer”]; n4[label=”Safety Officer”]; n5[label=”Operations Section”]; n6[label=”Planning Section”]; n7[label=”Logistics Section”]; n8[label=”Finance/Admin. Section”]; node[shape=none, width=0, height=0, label=””]; edge[dir=none]; n1 -> p1 -> p2 -> p3; … Read more

How to set the output size in GraphViz for the dot format?

Here’s the TL;DR version: To generate a 900 by 1500 pixel PNG image from the graph in foo.gv you can run: dot -Tpng -Gsize=9,15\! -Gdpi=100 -ofoo.png foo.gv to yield an image that is exactly 900 pixels wide or 1500 tall, but not necessarily both; and then: convert foo.png -gravity center -background white -extent 900×1500 final.png … Read more

Placing clusters on the same rank in Graphviz

You may use the newrank graph attribute (added in GraphViz 2.30) to activate the new ranking algorithm which allows defining rank=same for nodes which belong to clusters. Add the following line at the top: newrank=true; Add the following line after the cluster definitions: { rank=same; router1; router2; } Here’s the resulting graph:

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