dot - little helper package in Go for the graphviz dot language

DOT language

package main

import (
	"fmt"	
	"github.com/emicklei/dot"
)

// go run main.go | dot -Tpng  > test.png && open test.png

func main() {
	g := dot.NewGraph(dot.Directed)
	n1 := g.Node("coding")
	n2 := g.Node("testing a little").Box()

	g.Edge(n1, n2)
	g.Edge(n2, n1, "back").Attr("color", "red")

	fmt.Println(g.String())
}

Output

digraph {
	node [label="coding"]; n1;
	node [label="testing a little",shape="box"]; n2;
	n1 -> n2;
	n2 -> n1 [color="red", label="back"];
}

Chaining edges

g.Node("A").Edge(g.Node("B")).Edge(g.Node("C"))

A -> B -> C

Subgraphs

s := g.Subgraph("cluster")
s.Attr("style","filled")

cluster example

di := dot.NewGraph(dot.Directed)
outside := di.Node("Outside")

// A
clusterA := di.Subgraph("Cluster A", dot.ClusterOption{})
insideOne := clusterA.Node("one")
insideTwo := clusterA.Node("two")

// B
clusterB := di.Subgraph("Cluster B", dot.ClusterOption{})
insideThree := clusterB.Node("three")
insideFour := clusterB.Node("four")

// edges
outside.Edge(insideFour).Edge(insideOne).Edge(insideTwo).Edge(insideThree).Edge(outside)

About dot attributes

https://graphviz.gitlab.io/_pages/doc/info/attrs.html

display your graph

go run main.go | dot -Tpng  > test.png && open test.png

(c) 2015-2018, http://ernestmicklei.com. MIT License