The TikZ and PGF Packages
Manual for version 3.1.9a
Part IV Graph Drawing
by Till Tantau et al.
Graph drawing algorithms do the tough work of computing a layout of a graph for you. TikZ comes with powerful such algorithms, but you can also implement new algorithms in the Lua programming language.
\usetikzlibrary {arrows.meta,graphs,graphdrawing}
\usegdlibrary {layered}
\tikz [nodes={text
height=.7em, text
depth=.2em,
draw=black!20, thick, fill=white, font=\footnotesize},
>={Stealth[round,sep]}, rounded corners, semithick]
\graph [layered layout, level distance=1cm, sibling sep=.5em, sibling distance=1cm] {
"5th
Edition"
->
{ "6th
Edition", "PWB
1.0"
};
"6th
Edition"
->
{ "LSX"
[>child anchor=45], "1
BSD", "Mini
Unix", "Wollongong", "Interdata"
};
"Interdata"
->
{ "Unix/TS
3.0", "PWB
2.0", "7th
Edition"
};
"7th
Edition"
->
{ "8th
Edition", "32V", "V7M", "Ultrix-11", "Xenix", "UniPlus+"
};
"V7M"
->
"Ultrix-11";
"8th
Edition"
->
"9th
Edition";
"1
BSD"
->
"2
BSD"
->
"2.8
BSD"
->
{ "Ultrix-11", "2.9
BSD"
};
"32V"
->
"3
BSD"
->
"4
BSD"
->
"4.1
BSD"
->
{ "4.2
BSD", "2.8
BSD", "8th
Edition"
};
"4.2
BSD"
->
{ "4.3
BSD", "Ultrix-32"
};
"PWB
1.0"
->
{ "PWB
1.2"
->
"PWB
2.0", "USG
1.0"
->
{ "CB
Unix
1", "USG
2.0"
}};
"CB
Unix
1"
->
"CB
Unix
2"
->
"CB
Unix
3"
->
{ "Unix/TS++", "PDP-11
Sys
V"
};
{ "USG
2.0"
->
"USG
3.0", "PWB
2.0", "Unix/TS
1.0"
} ->
"Unix/TS
3.0";
{ "Unix/TS++", "CB
Unix
3", "Unix/TS
3.0"
} ->
"TS
4.0"
->
"System
V.0"
->
"System
V.2"
->
"System
V.3";
};