graphviz.md

Compile dot

To compile your *.dot file use the dot CLI tool as follows

dot -T[FORMAT] [INPUT] -o [OUTPU]

# Example
dot -Tpng graph.dot -o graph.png

DPI / Resolution

There are two methods to tune the Dots Per Inch DPI in the output graph, the first one is to use the -Gdpi= flag and the second one is to use graph [ dpi = 600 ]; in your dot file

digraph {
    graph [ dpi = 600 ];
    a -> b -> c
    b -> d
    a -> a[label="oh!"]
}

Aggregate arrow heads

Source: https://mike42.me/blog/2015-02-how-to-merge-edges-in-graphviz

Just create a node that is invisibly small and point the headless edges to it, then point that to the main node with a head of any type.

digraph mygraph {
    hidden [shape=point, width=0.01, height=0.01]
    { a b c d } -> hidden [dir=none]
    hidden -> e
}