Graphviz の導入

Mac の場合

$ brew install graphviz
==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.6.3_2.yosemite.bottle.tar.gz
######################################################################### 100.0%
==> Pouring portable-ruby-2.6.3_2.yosemite.bottle.tar.gz
==> Tapping homebrew/cask
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask'...
remote: Enumerating objects: 4, done.
remote: Counting objects: 100% (4/4), done.
remote: Compressing objects: 100% (4/4), done.
Receiving objects:  82% (450120/548926), 213.99 MiB | 6.41 MiB/s

DOT言語
https://graphviz.org/doc/info/lang.html
サンプル
https://graphviz.org/gallery/
言語アトリビュートリスト
https://graphviz.org/doc/info/attrs.html