#contents http://www.graphviz.org/Documentation/dotguide.pdf dot -Tgif -o output.gif input.dot * 単純な有向グラフ digraph G { // 横方向ならLR // 横方向ならLR rankdir=TB; from -> to; } * 同列に並べる digraph G { from -> to1; from -> to2; to1 -> to2; {rank = same; to1; to2;} } A -> B; {rank = same; A; B;} * 矢印を消す digraph G { from -> to [arrowhead = none]; } from -> to [arrowhead = none]; * 配置に影響を与えない from -> to [constraint = false]; * 複数オプション from -> to [arrowhead = none, constraint = false];