注意1,2,3,4 箭头的起始变化

digraph {
  compound=true;

  subgraph cluster_a {
    label="Cluster A";
    node1; node3; node5; node7;
  }
  subgraph cluster_b {
    label="Cluster B";
    node2; node4; node6; node8;
  }

  node1 -> node2 [label="1"];
  node3 -> node4 [label="2" ltail="cluster_a"];

  node5 -> node6 [label="3" lhead="cluster_b"];
  node7 -> node8 [label="4" ltail="cluster_a" lhead="cluster_b"];
}

合并连线

digraph {
    concentrate=true
    a -> b [label="1"]
    c -> b
    d -> b
}

连线方向约束

digraph G {
  a -> c;
  a -> b;
  b -> c [constraint=false];
}

连线上标签

digraph {
  a -> a [label="AA" decorate=true]
  a -> b [label="AB" decorate=true]
  b -> b [label="BB" decorate=false]
}

方位控制

digraph {
    rankdir=TB
    subgraph cluster_vertical_example2{
        Node1; Node6
    }
    subgraph cluster_vertical_example{
        "Node2"-> "Node3";
        "Node3"-> "Node4";
        "Node4"->"Node5"
        {rank=same; "Node4"; "Node5";}
    }
    Node1 -> Node2 [constraint=false, dir=back]
}

结构体

digraph structs {
    node[shape=record];
    graph[rankdir=TB];
        struct1[label="<f0> left|<f1> mid\ dle|<f2> right"];
    struct2[label="<f0> one|<f1> two"];
    struct3[label="hello\nworld |{ b |{c|<here> d|e}| f}| g | h"];
    struct1:f1 -> struct2:f0;
    struct1:f2 -> struct3:here;
    subgraph clusterAnimalImpl{
        bgcolor = "yellow";
        Dog[label = "{Dog| |+ bark() : void\l + main() :void}" , shape = "record"];
        Cat[label = "{Cat| |+ meow() : void\l}" , shape = "record"];
    };
}

方向，尺寸，间距

digraph G {
    nodesep = 2;
    ranksep = 1;
    rankdir = LR;
    a -> b; c; b -> d;
}

port 属性

digraph G {
    a0 -> b0:w;
    a1 -> b1:e;
    a2 -> b2:n;
    a3 -> b3:s;
    a3_1 -> b3_1:nw;
    a3_2 -> b3_2:se;
}

颜色控制

style：filled, invisible, diagonals, rounded. dashed, dotted, solid, bold
color:green,blue,lightblue,yellow,grey

脑图

例子

digraph {
  rankdir=TB

  subgraph cluster_b {
    label="Cluster B";
    {rank=same; node2; node4; node6; node8;}
  }

  subgraph cluster_a {
    label="Cluster A";
    {rank=same; node1; node3; node5; node7;}
  }

  subgraph cluster_c {
    label="Cluster c";
    {rank=same; node11; node12; node15; node17;}
  }
  node1 -> node11 []
  node11 -> node2
}

digraph {
    newrank=true;
    rankdir="LR";
    subgraph clusterA {
        a0 -> a1 -> a2 [style = invis] // set node order in cluster
        a2 -> a0 [constraint=false] //don't use this edge for ranking
    }

    subgraph clusterB {
        b0 -> b1 -> b2 [style = invis]
        b2 -> b0  [constraint=false]
    }

    subgraph clusterc {
        c0 -> c1 -> c2 [style = invis]
        c2 -> c0  [constraint=false]
    }
}

subgraph clusterB {
    b0 -> b1 -> b2 [style = invis]
    b2 -> b0  [constraint=false]
}

subgraph clusterc {
    c0 -> c1 -> c2 [style = invis]
    c2 -> c0  [constraint=false]
}

digraph graph_name{
    bgcolor="transparent";//背景透明
        subgraph cluster_subgraph_name{//聚集子图
            node[shape=box];
            cluster_A -> cluster_B;
        }
        subgraph subgraph_name{//子图
            node[shape=none];
            sub_A -> sub_B;
        }
        {//匿名子图
            node[shape=octagon];
            nest_A -> nest_B;
        }
        global_A -> global_B;
        cluster_B -> global_B;
        sub_B -> global_B;
        nest_B -> global_B;
}

"Self-Portrait with Grey Felt Hat" [URL="https://www.vangoghmuseum.nl/en/collection/s0016V1962"]
"Self-Portrait as a Painter" [URL="https://www.vangoghmuseum.nl/en/collection/s0022V1962"]

"Sunflowers" [URL="https://www.nationalgallery.org.uk/paintings/vincent-van-gogh-sunflowers"]
"Almond Blossom" [URL="https://www.vangoghmuseum.nl/en/collection/s0176V1962"]